Control device, antenna device, and control method

Abstract

A control device (100) controls an array antenna that irradiates a load disposed inside a closed space with electromagnetic waves. The control device comprises: a composite electromagnetic field calculation unit (120) that refers to pre-stored element electromagnetic field information, which is information indicating the distribution of an element electromagnetic field generated when element antennas constituting the array antenna are excited one by one, and uses the element electromagnetic field information and candidates for an excitation coefficient comprising an input amplitude and an input phase for each element antenna, to calculate a radiated electromagnetic field value at the load; an active reflection coefficient calculation unit (130) that refers to pre-stored complex reflection coefficient information, which is information of a complex reflection coefficient at each element antenna generated by excitation, and uses the complex reflection coefficient information and the candidates for the excitation coefficient to calculate an active reflection coefficient at each element antenna; and an excitation coefficient evaluation unit (140) that uses the radiated electromagnetic field value, the active reflection coefficient, and an objective function including a first target value, a second target value, the excitation coefficient, the radiated electromagnetic field value, and the active reflection coefficient to determine an excitation coefficient such that the ratio of power consumption between a region including a part of the load and a region other than said region is equal to or less than the first target value and the active reflection coefficient is equal to or less than the second target value.

Description

Control device, antenna device, and control method

[0001] This disclosed technology relates to control technology for controlling array antennas.

[0002] Conventionally, there are technologies for controlling the irradiation of an object to be heated with electromagnetic waves. For example, there are devices that irradiate a specific structure with electromagnetic waves (radio waves, microwaves) in a small space (closed space) surrounded by metal. Examples include microwave ovens, microwave dryers, and indoor wireless power transmission devices. As a means of controlling the electromagnetic waves radiated in such devices, Patent Document 1 discloses a method using multiple antennas. Patent Document 1 describes a method that includes a first microwave output unit and a second microwave output unit, and uses microwave receiving functions and various sensors to identify the object to be irradiated with electromagnetic waves (load) installed in the device, and adjusts the output of each unit to heat the load. Here, although not explicitly stated in Patent Document 1, there is a method in which the amplitude, phase, and output timing of the signals input to multiple antennas are coordinated to make them operate virtually as a single antenna. Antennas of this type are generally called array antennas. The antennas that make up the array antenna are called element antennas, and the complex value input signals given to each element antenna are called excitation coefficients.

[0003] Japanese Patent Publication No. 2013-201096

[0004] Here, when an array antenna is installed in a closed space and electromagnetic waves are radiated, the following two problems arise. The first is the challenge of controlling the electromagnetic field. In a closed space, electromagnetic waves radiated from the array antenna are scattered by the walls, forming a complex electromagnetic field distribution different from that in an open space. Furthermore, scattering of electromagnetic waves by the load also occurs, so unless the excitation coefficient is set taking these into account, it is not possible to form the desired electromagnetic field on or inside the load surface. The second is related to the reflection coefficient. The influence that one element antenna has on another element antenna is called inter-element coupling. Generally, inter-element coupling is greater the closer the distance between antennas. Also, since it is difficult to make an operating antenna perfectly matched with the circuit connected to its back, some of the radiated power may return to the circuit from the antenna's feed point (port). The ratio of the power returned to the input is called the reflection coefficient. In the case of an array antenna, some of the output from other antennas also flows into the port. This power is determined by inter-element coupling and the excitation coefficient, and the ratio of the sum of the power returned to the port to the input is called the active reflection coefficient. Furthermore, in the case of a closed space, some of the power radiated into space is also returned due to the effects of multiple scattering mentioned earlier. As a result, power exceeding the input value may flow into the port. When a large amount of power is radiated from the antenna, if the active reflection coefficient is large, instability of the amplifier output due to circuit or impedance mismatch or equipment failure may occur. In the prior art, including the invention described in Patent Document 1, there is no suggestion to set the excitation coefficient while considering both the desired composite electromagnetic field and the reduction of the active reflection coefficient, and there is a problem in that it is not possible to control the system to achieve a good balance between the desired composite electromagnetic field and the reduction of the active reflection coefficient.

[0005] This disclosure aims to solve the above-mentioned problems by enabling a balanced control of the desired composite electromagnetic field and the reduction of the active reflection coefficient when electromagnetic waves are irradiated onto a load placed inside a closed space using an array antenna.

[0006] The control device of this disclosure is a control device for controlling an array antenna that irradiates an electromagnetic wave onto a load placed inside a closed space, comprising: a composite electromagnetic field calculation unit that calculates a radiated electromagnetic field value at the load by referring to pre-stored element electromagnetic field information which is information showing the distribution of element electromagnetic fields generated when each element antenna constituting the array antenna is excited, and using the element electromagnetic field information and candidate excitation coefficients consisting of input amplitude and input phase for each element antenna; an active reflection coefficient calculation unit that calculates an active reflection coefficient at each element antenna by referring to pre-stored complex reflection coefficient information which is information on the complex reflection coefficient at each element antenna generated by the excitation, and using the complex reflection coefficient information and candidate excitation coefficients; and an excitation coefficient evaluation unit that determines an excitation coefficient such that the ratio of power consumption between a region including a part of the load and a region other than that region is less than or equal to the first target value and the active reflection coefficient is less than or equal to the second target value, using the radiated electromagnetic field value, the active reflection coefficient, a first target value, a second target value, an excitation coefficient, the radiated electromagnetic field value, and the active reflection coefficient as an objective function, It is something that is provided.

[0007] According to this disclosure, when electromagnetic waves are irradiated onto a load placed inside a closed space using an array antenna, the desired composite electromagnetic field and the reduction of the active reflection coefficient can be controlled in a balanced manner.

[0008] Figure 1 is a diagram showing an example of the configuration of a control device (closed space information computing device) according to Embodiment 1 of this disclosure. Figure 2 is a diagram showing an example of the configuration of an antenna device to which the control device (closed space information computing device) according to Embodiment 1 of this disclosure is applied. Figure 3 is a diagram showing an example of the configuration of the excitation coefficient evaluation unit in the control device (closed space information computing device) according to Embodiment 1 of this disclosure. Figure 4 is a diagram showing an example of the configuration when the configuration of the excitation coefficient evaluation unit according to Embodiment 1 of this disclosure is applied to the antenna device shown in Figure 2. Figure 5 is a flowchart showing an example of processing by the control device (closed space information computing device) according to Embodiment 1 of this disclosure. Figure 6 is a diagram showing an example of the configuration of a control device (closed space information computing device) according to Embodiment 2 of this disclosure. Figure 7 is a diagram for explaining the area defined in the control device (closed space information computing device) according to Embodiment 2 of this disclosure. Figure 8 is a diagram showing an example of an antenna and a closed space controlled by the control device (closed space information computing device) according to Embodiment 2 of this disclosure, where Figure 8A is a view from above and through, and Figure 8B is a cross-sectional view along the y-z plane in Figure 8A. Figure 9 is an example of the calculation results under the first condition by the control device (closed space information computing device) according to Embodiment 2 of this disclosure, where Figure 9A shows the power distribution in the central region of the load (water) and Figure 9B shows the active reflection coefficient. Figure 10 is an example of the calculation results under the second condition by the control device (closed space information computing device) according to Embodiment 2 of this disclosure, where Figure 10A shows the power distribution in the central region of the load (water) and Figure 10B shows the active reflection coefficient. Figure 11 is an example of the calculation results under the third condition by the control device (closed space information computing device) according to Embodiment 2 of this disclosure, where Figure 11A shows the power distribution in the central region of the load (water) and Figure 11B shows the active reflection coefficient. Figure 12 is a flowchart showing an example of the processing of the control device (closed space information computing device) according to Embodiment 2 of this disclosure. Figure 13 is a diagram showing an example of the configuration of the control device (closed space information computing device) according to Embodiment 3 of this disclosure. Figure 14 shows an example of the configuration of an antenna device to which the control device (closed space information computing device) according to Embodiment 3 of this disclosure is applied.Figure 15 is a flowchart showing an example of processing by a control device (closed-space information computing device) according to Embodiment 3 of this disclosure. Figure 16 is a diagram showing an example of the configuration of a control device (closed-space information computing device) according to Embodiment 4 of this disclosure. Figure 17 is a diagram showing an example of the configuration of an antenna device to which the control device (closed-space information computing device) according to Embodiment 4 of this disclosure is applied. Figure 18 is a flowchart showing an example of processing by a control device (closed-space information computing device) according to Embodiment 4 of this disclosure. Figure 19 is a diagram showing an example of the configuration of a control device (closed-space information computing device) according to Embodiment 5 of this disclosure. Figure 20 is a diagram showing an example of the configuration of an antenna device to which the control device (closed-space information computing device) according to Embodiment 5 of this disclosure is applied. Figure 21 is a flowchart showing an example of processing by a control device (closed-space information computing device) according to Embodiment 5 of this disclosure. Figure 22 is a diagram showing an example of the configuration of a control device (closed-space information computing device) according to Embodiment 6 of this disclosure. Figure 23 is a diagram showing an example of the configuration of an antenna device to which the control device (closed-space information computing device) according to Embodiment 6 of this disclosure is applied. Figure 24 is a flowchart showing an example of processing by a control device (closed-space information computing device) according to Embodiment 6 of the present disclosure. Figure 25 is a diagram showing a first example of a hardware configuration for realizing the functions according to the configuration of the present disclosure. Figure 26 is a diagram showing a second example of a hardware configuration for realizing the functions according to the configuration of the present disclosure.

[0009] In a general array antenna, in order to avoid radiation in unnecessary directions, the element antennas are installed so as to be 0.5 wavelengths or less with respect to the wavelength of the desired electromagnetic wave. Each element antenna has a three-dimensional spatial distribution (electromagnetic field distribution) of electromagnetic waves according to the operating frequency. Since the electromagnetic waves radiated from each element antenna are synthesized in space due to the property of wave superposition, the electromagnetic field distribution can be flexibly controlled by adjusting the excitation coefficient. Therefore, it becomes possible to use the antenna in such a way that the electromagnetic field is partially concentrated on a part of the load. Here, the design of the excitation coefficient that achieves both control of the electromagnetic field (hereinafter referred to as the synthesized electromagnetic field) as an array antenna radiated into space and reduction of the active reflection coefficient becomes important for operating the array antenna in a closed space. Although it can be assumed that an optimization algorithm is used for setting the excitation coefficient, since the desired synthesized electromagnetic field and reduction of the active reflection coefficient do not always have an optimal value of a single excitation coefficient, simply running the algorithm blindly does not yield an appropriate answer. An appropriate evaluation method considering the balance of the two conditions described at the beginning is required, but such a method has not been disclosed in the past. The present disclosure relates to an antenna device that radiates electromagnetic waves into a closed space where a load is installed or a control device in the antenna device with respect to the above method.

[0010] Hereinafter, in order to explain the present disclosure in more detail, embodiments of the present disclosure will be described with reference to the accompanying drawings.

[0011] Embodiment 1. In Embodiment 1, a configuration example of a basic form of the present disclosure will be described.

[0012] An example of the configuration of a control device (information calculation device in a closed space) according to Embodiment 1 of the present disclosure will be described. Also, a detailed example of the configuration of an antenna device to which the control device (information calculation device in a closed space) is applied will be described. FIG. 1 is a diagram showing an example of the configuration of a control device (information calculation device in a closed space) according to Embodiment 1 of the present disclosure. FIG. 2 is a diagram showing an example of the configuration of an antenna device to which the control device (information calculation device in a closed space) according to Embodiment 1 of the present disclosure is applied.

[0013] The control device (information calculation device within a closed space) 100 (100A) controls an array antenna that irradiates electromagnetic waves to a load disposed inside the closed space. The control device (information calculation device within a closed space) 100 (100A) outputs a signal including an excitation coefficient to the array antenna 200 to control the array antenna 200 and the electromagnetic waves irradiated by the array antenna 200.

[0014] The array antenna 200 irradiates electromagnetic waves to a load disposed inside the closed space. The array antenna 200 has a plurality of element antennas. The element antennas are a plurality of element antennas that constitute an array antenna that irradiates electromagnetic waves to a load disposed inside the closed space, and each of them is connected to an amplifier and a phase shifter. The array antenna 200 irradiates electromagnetic waves to a load disposed inside the closed space according to the excitation coefficient output by the control device (information calculation device within a closed space) 100 (100A).

[0015] The control device (information calculation device within a closed space) 100 (100A) shown in FIG. 1 includes a storage unit 110, a synthetic electromagnetic field calculation unit 120, an active reflection coefficient calculation unit 130, and an excitation coefficient evaluation unit 140.

[0016] The storage unit 110 (storage device) stores in advance the element electromagnetic field information and the complex reflection coefficient information related to the array antenna 200. The element electromagnetic field information is information indicating the distribution of the element electromagnetic field generated when each of the element antennas constituting the array antenna 200 is excited one by one. The complex reflection coefficient information is information on the complex reflection coefficient of each element antenna generated by the excitation when each of the element antennas constituting the array antenna 200 is excited one by one. Although the storage unit (storage device) 110 has been described as an internal configuration of the control device (information calculation device within a closed space) 100 (100A), it may also be an external configuration of the control device (information calculation device within a closed space) 100 (100A). That is, the storage unit (storage device) 110 does not have to be included inside the control device (information calculation device within a closed space) 100 (100A).

[0017] The combined electromagnetic field calculation unit 120 calculates the radiated electromagnetic field value based on the element electromagnetic field information and candidate excitation coefficients. The combined electromagnetic field calculation unit 120 refers to element electromagnetic field information, which is information indicating the distribution of element electromagnetic fields generated when each element antenna constituting the array antenna is excited, and calculates the radiated electromagnetic field value at the load using the element electromagnetic field information and candidate excitation coefficients consisting of input amplitude and input phase for each element antenna.

[0018] The active reflection coefficient calculation unit 130 calculates the active reflection coefficient based on the complex reflection coefficient information and the candidate excitation coefficient. The active reflection coefficient calculation unit 130 refers to the complex reflection coefficient information of each element antenna generated by the excitation when each element antenna constituting the array antenna is excited one by one, which is stored in advance, and uses the complex reflection coefficient information and the candidate excitation coefficient to calculate the active reflection coefficient of each element antenna.

[0019] The excitation coefficient evaluation unit 140 determines the excitation coefficient using an objective function that includes a first target value for evaluating the power for each region in a closed space, and a second target value for evaluating the active reflection coefficient. The excitation coefficient evaluation unit 140 uses the radiated electromagnetic field value, the active reflection coefficient, and the objective function that includes the first target value, the second target value, the excitation coefficient, the radiated electromagnetic field value, and the active reflection coefficient to determine an excitation coefficient such that the ratio of power consumption between the region containing a part of the load and the region other than that region is less than or equal to the first target value, and the active reflection coefficient is less than or equal to the second target value.

[0020] The objective function in this disclosure is a function that includes a first evaluation function, a second evaluation function, weights, a radiated electromagnetic field value, and an active reflection coefficient. The first evaluation function is a function with the first target value and the excitation coefficient as variables. The second evaluation function is a function with the second target value and the excitation coefficient as variables. The weights are coefficients consisting of values ​​or functions that determine the balance between the first evaluation function and the second evaluation function. The radiated electromagnetic field value in the objective function is input to the radiated electromagnetic field value calculated by the composite electromagnetic field calculation unit 120. The active reflection coefficient in the objective function is input to the active reflection coefficient calculated by the active reflection coefficient calculation unit 130.

[0021] Here, an example of the internal configuration of the excitation coefficient evaluation unit (excitation coefficient evaluation device) in the control device (closed space information computing device) of this disclosure will be described. Figure 3 is a diagram showing an example of the configuration of the excitation coefficient evaluation unit in the control device (closed space information computing device) according to Embodiment 1 of this disclosure.

[0022] The excitation coefficient evaluation unit (excitation coefficient evaluation device) 140 shown in Figure 3 is composed of a domain definition unit 141, an objective function calculation unit 142, and an objective function evaluation unit 143.

[0023] The region definition unit 141 defines the heating target region, etc., within the closed space based on the acquired region information. The heating target region is the region where power is concentrated. Based on the region information that has been received and stored in advance, the region definition unit 141 defines a maximization region that includes the region where power is concentrated within the closed space, a minimization region which is the region other than the maximization region, and power evaluation points for each of these regions. The regions that have been received and stored in advance only need to be regions that have been received and stored in advance before processing. For each defined region, the region definition unit 141 outputs region information including the location of the evaluation point in that region to the objective function calculation unit 142.

[0024] The objective function calculation unit 142 calculates the objective function for each evaluation point in the region defined by the region definition unit 141, and outputs candidate excitation coefficients to the composite electromagnetic field calculation unit 120 and the active reflection coefficient calculation unit 130.

[0025] The objective function evaluation unit 143 evaluates the objective function for each candidate excitation coefficient and determines the excitation coefficient that satisfies the pre-set conditions. The objective function evaluation unit 143 outputs the determined excitation coefficient to the array antenna 200.

[0026] The control device (closed-space information computing device) 100 may also include, in addition to the above configuration, a control unit (not shown), a storage unit (not shown), and a communication unit (not shown). The control unit (not shown) controls the entire control device (closed-space information computing device) 100 and each of its components. The control unit (not shown) starts the control device (closed-space information computing device) 100 according to an external command, for example. The control unit (not shown) also controls the state of the control device (closed-space information computing device) 100 (operating state = state such as start, shutdown, sleep). The storage unit (not shown) stores the data used by the control device (closed-space information computing device) 100. The storage unit (not shown) stores the output (output data) from each component of the control device (closed-space information computing device) 100, for example, and outputs the requested data to the requesting component. The communication unit (not shown) communicates with external devices. For example, communication is performed between the control device (closed-space information computing device) 100 (100A) and peripheral devices (for example, devices other than the control device (closed-space information computing device) 100 in an antenna device). For example, if the control device (closed-space information computing device) 100 and other devices are not connected by wire, the communication unit (not shown) has the function of performing communication between the control device (closed-space information computing device) 100 and other devices. The communication unit (not shown) may also have the function of performing communication with an external device, such as a server device. The control unit (not shown), storage unit (not shown), and communication unit (not shown) are the same in the embodiments described later.

[0027] Next, a detailed example of a configuration in which the control device (closed space information computing device) 100 (100A) shown in Figure 1 is applied to an antenna device will be described. The control device (closed space information computing device) 100 (100A) can be applied as the closed space information computing device 100 (100A') (control device) in the antenna device 10 (10A) shown in Figure 2.

[0028] The antenna device 10 (10A) radiates electromagnetic waves into a closed space in which the load to be heated is installed. The antenna device 10 (10A) and the control device (closed space information computing device) 100 (100A) each determine the excitation coefficient based on information about element electromagnetic fields and reflected power that has been calculated, measured, or estimated in advance, thereby concentrating power on the surface or a part of the interior of the load and making the ratio of the power in the affected area to the power in other areas below a certain target value. Furthermore, by making the active reflection coefficient at each element antenna end below another target value, failures due to reflected power are suppressed. The antenna device 10 (10A) shown in Figure 2 includes a closed space information computing device 100 (100A') (control device), an array antenna 200, and a closed space 300.

[0029] The array antenna 200 consists of an amplifier 210, a phase shifter 220, and element antennas 230. Each element antenna 230 is connected to the amplifier 210 and the phase shifter 220, and is controlled via the amplifier 210 and the phase shifter 220.

[0030] The enclosed space 300 is, for example, a small space surrounded by metal. A load 1000 is placed inside the enclosed space 300 shown in Figure 2. The load 1000 is not particularly limited in this disclosure and may be, for example, water.

[0031] The closed-space information computing device 100 (100A') corresponds to the control device (closed-space information computing device) 100 (100A) shown in Figure 1. The calculation of the excitation coefficient is performed by the closed-space information computing device 100 (100A'). The closed-space information computing device 100 (100A') (control device) shown in Figure 2 includes a storage device 110 (110'), a composite electromagnetic field calculator 120 (120'), an active reflection coefficient calculator 130 (130'), and an excitation coefficient evaluation device 140 (140'). The closed-space information computing device 100 (100A') consists of a computer with a CPU and storage such as memory and hard disk as its components, with the storage device being implemented as storage and the other devices being implemented as programs (see the explanation in the last section).

[0032] The memory device 110 (110') corresponds to the storage unit 110 shown in Figure 1. The memory device 110 (110') (storage unit) stores some of the information necessary for calculating the excitation coefficient. The memory device 110 (110') stores information on the element electromagnetic field generated in the closed space, on the load surface, and within the load (element electromagnetic field distribution information) when only one of the element antennas constituting the array antenna is excited, and complex reflection coefficient information for each element antenna generated by the excitation. The memory device 110 (110') stores spatial distribution information of the electromagnetic field when electromagnetic waves are radiated from one of the element antennas constituting the array antenna on which the load is installed. This element electromagnetic field information also takes into account the effects of multiple scattering by the wall and the load. Since the element electromagnetic field information changes depending on the installed load, element electromagnetic field information for multiple loads that are expected to be installed in a closed space is stored. The element electromagnetic field information includes the position in the closed space, the complex value of the electromagnetic field, and the relative permittivity and relative permeability at each position. The position can be chosen in any way, but data on a grid divided into fixed intervals within a closed space is more preferable.

[0033] The combined electromagnetic field calculation device 120 (120') corresponds to the combined electromagnetic field calculation unit 120 shown in Figure 1. The combined electromagnetic field calculation device 120 (120') (combined electromagnetic field calculation unit) calculates the combined electromagnetic field. The combined electromagnetic field calculation device 120 (120') uses the element electromagnetic field distribution information and excitation coefficients consisting of input amplitude and input phase for each element to calculate the radiated electromagnetic field value of the array antenna at arbitrary positions on the surface and inside the load. The combined electromagnetic field calculation device (combined electromagnetic field calculation unit) 120 (120') uses the excitation coefficients evaluated by the excitation coefficient evaluation device 140 (140') and element electromagnetic field information retrieved from the storage device 110 (110') to calculate the combined electromagnetic field at arbitrary evaluation points. Here, the evaluation points are positions where the validity of the combined electromagnetic field is evaluated, and consist of multiple points inside the load, on the surface, or outside the load and inside a closed space. The positions and frequencies of the evaluation points do not necessarily have to be information stored as element electromagnetic field information. If the information is not stored, an estimated value is obtained from the stored element electromagnetic field information using interpolation or other methods.

[0034] The active reflection coefficient calculation device 130 (130') corresponds to the active reflection coefficient calculation unit 130 shown in Figure 1. The active reflection coefficient calculation device 130 (130') (active reflection coefficient calculation unit) calculates information regarding reflection to the port. The active reflection coefficient calculation device 130 (130') calculates the active reflection coefficient at the output terminal of each element antenna from the complex reflection coefficient information and the excitation coefficient. In the active reflection coefficient calculation device 130 (130'), the active reflection coefficient is calculated from the excitation coefficient evaluated by the excitation coefficient evaluation device 140 (140') and the reflection information retrieved from the storage device 110 (110'). The reflection information is preferably a scattering matrix (S-parameter, S-matrix) representing the network characteristics of the electronic circuit, but it can be stored in any format as long as it is information that can be converted to S-parameters with some additional information, such as an admittance matrix, impedance matrix, or complex reflection coefficient.

[0035] The excitation coefficient evaluation device 140 (140') corresponds to the excitation coefficient evaluation unit 140 shown in Figure 1. The excitation coefficient evaluation device 140 (140') (excitation coefficient evaluation unit) optimizes the excitation coefficient. The excitation coefficient evaluation device 140 (140') determines the excitation coefficient from the calculated value of an objective function consisting of a first evaluation function with a first target value and the excitation coefficient as variables, a second evaluation function with a second target value and the excitation coefficient as variables, weights that determine the balance between the first and second evaluation functions, the radiated electromagnetic field value, and the reflection coefficient (active reflection coefficient) of the operating state at the output terminal of each element antenna constituting the array antenna. The excitation coefficient evaluation device 140 (140') is a device for calculating and evaluating the excitation coefficient. The calculation uses a general optimization algorithm. Any algorithm can be used, such as the conjugate gradient method, quasi-Newton method, particle swarm optimization or their improvements, or machine learning. However, the algorithm should be one that searches for excitation coefficients that satisfy the target value, using the objective function described below as the evaluation target.

[0036] Here, the excitation coefficient evaluation device 140 (140') shown in Figure 2 will be described in detail with reference to Figure 4. Figure 4 is a diagram showing an example of a configuration when the configuration of the excitation coefficient evaluation unit according to Embodiment 1 of this disclosure is applied to the antenna device shown in Figure 2. The excitation coefficient evaluation device 140 (140') shown in Figure 4 consists of a region definition device 141 (141'), an objective function calculation device 142 (142'), and an objective function evaluation device 143 (143').

[0037] The region definition device 141 (141') corresponds to the region definition unit 141 shown in Figure 3. The region definition device 141 (141') is a device that determines the position of the evaluation points mentioned earlier. It calculates the position of the evaluation points according to input from the user or a predefined range and number of division points. It is also desirable that it has a function that can automatically calculate the position of points necessary for validating the electromagnetic field distribution, even if only the range is defined by the user. Hereafter, the region surrounding the point where power (proportional to the square of the absolute value of the combined electromagnetic field) is concentrated will be called the maximization region, and the other region will be called the minimization region.

[0038] The objective function calculation device 142 (142') corresponds to the objective function calculation unit 142 shown in FIG. 3. The objective function calculation device 142 (142') calculates the objective function from the combined electromagnetic field at the evaluation point, the active reflection coefficient of each port, the first target value for determining the validity of the combined electromagnetic field, the second target value for evaluating the validity of the active reflection coefficient, the weight coefficient for determining the optimization priority of the combined electromagnetic field and the active reflection coefficient, and the comprehensive target value for determining the proximity of the objective function to the desired solution. The objective function f is expressed, for example, by the following formula (1). f(w) = D １ p(w, G １ ) + D ２ q(w, G ２ ) ・・・(1) Here, "w" is a set of excitation coefficients given to M element antennas, and is represented as w = [w １ w ２ ・・・ w Ｍ ] using a vector. Hereinafter, the set w will be referred to as the excitation coefficient. "G １ " and "G ２ " are the first target value G １ and the second target value G ２ respectively. "p" and "q" are values calculated from the excitation coefficient and each target value, and are functions for evaluating the validity of the combined electromagnetic field and the active reflection coefficient (the first evaluation function p and the second evaluation function q) respectively.

[0039] A method for calculating the first evaluation function p in the objective function calculation device 142 (142') will be described. In the calculation of the first evaluation function p, the objective function calculation device 142 (142') sends candidate values of the excitation coefficient to the combined electromagnetic field calculation device 120 (120'). The candidate values can be any values. If the values of the excitation coefficients that can generate a desired electromagnetic field distribution to some extent are known in advance, those values can be used as estimated values. The value of the combined electromagnetic field sent from the combined electromagnetic field calculation device 120 (120') is converted into statistical information. This statistical information includes, for example, the maximum value, minimum value, median value, average value, variance value, etc. of the power. Also, the statistical information is calculated for each point included in the maximization region and each point included in the minimization region. The first evaluation function p is defined by, for example, the ratio of the statistical value in the maximization region to the statistical value in the minimization region and the difference from the first target value G １ .

[0040] The method for calculating the second evaluation function q in the objective function calculation device 142 (142') will be explained. In calculating the second evaluation function q, the objective function calculation device 142 (142') sends candidate values ​​for the excitation coefficient to the active reflection coefficient calculation device 130 (130'). The active reflection coefficient calculation device 130 (130') calculates the active reflection coefficient Γ based on the following equation (2). ａ Calculate. Here, "m" and "n" are the element antenna numbers, "S ｍｎ The first parameter, 'm', represents the S-parameter of the coupling between element antenna m and element antenna n. The second evaluation function q is defined by the ratio of the maximum value of the active reflection coefficient of all element antennas to the second target value.

[0041] As shown in equation (1), the objective function f is expressed as a linear combination of the first evaluation function p and the second evaluation function q. The weight of the combination is D. １ and weight D ２ This is determined according to the optimization of the combined electromagnetic field and the priority of the active reflection coefficient. Any value can be used as long as it is a value that can determine the priority, but D ２ = 1 - D １ This is desirable. Generally, the smaller the closed space 300, the greater the power returning to each port. Therefore, if the closed space 300 is small, the second evaluation function q should be weighted D so that it is evaluated preferentially over the first evaluation function p. １ and weight D ２ It is desirable that this be calculated. From the above calculations, the objective function f is determined.

[0042] The objective function evaluation device 143 (143') corresponds to the objective function evaluation unit 143 shown in Figure 3. The objective function evaluation device 143 (143') checks whether the objective function is less than or equal to the desired overall target value. If the condition is not met, the value is updated to a new value by the optimization algorithm. The algorithm is repeated until the objective function is less than or equal to the overall target value or until a predetermined number of times. If the objective function does not reach the desired overall target value, or if only one of the first evaluation function p and the second evaluation function q does not fall below the desired value, the weight D １ and weight D ２You can change the parameters and perform the calculation using the same steps. Finally, output the excitation coefficient as a final value. The output excitation coefficient is sent to the amplifier and phase shifter.

[0043] When the excitation coefficient is input to the amplifier 210 and phase shifter 220 of each element antenna, electromagnetic waves are irradiated into the closed space 300 by the array antenna 200, the ratio of power consumption of a portion of the load to the rest of the load in the closed space becomes less than or equal to the first target value, and the active reflection coefficient becomes less than or equal to the second target value. In this way, by considering multiple scattering and reflection from the load in the closed space, a desired electromagnetic field distribution that satisfies the first target value can be realized in the closed space, and the active reflection coefficient can be made less than or equal to the second target value.

[0044] Next, an example of the processing of the control device (closed space information computing device) according to Embodiment 1 of this disclosure will be described. Figure 5 is a flowchart showing an example of the processing of the control device (closed space information computing device) according to Embodiment 1 of this disclosure. The processing shown in Figure 5 is a control method by the control device (closed space information computing device) according to this embodiment. When the control device 100 (100A) (closed space information computing device 100A') receives a processing start command from, for example, a control unit (not shown), it starts the processing shown in Figure 5 ("start"). The control device 100 (100A) (closed space information computing device 100A') then executes the composite electromagnetic field calculation process (step ST1010 "composite electromagnetic field calculation") and the active reflection coefficient calculation process (step ST1020 "active reflection coefficient calculation").

[0045] In the composite electromagnetic field calculation process of step ST1010, the composite electromagnetic field calculation unit 120 (composite electromagnetic field calculation device 120') of the control device 100 (100A) (closed space information calculation device 100A') calculates the radiated electromagnetic field value based on the element electromagnetic field information and candidate excitation coefficients. When the composite electromagnetic field calculation unit 120 (composite electromagnetic field calculation device 120') obtains candidate excitation coefficient values ​​from the objective function calculation unit 142 of the excitation coefficient evaluation unit 140 (excitation coefficient evaluation device 140'), it refers to the element electromagnetic field information previously stored in the storage unit 110 (storage device 110') and calculates the radiated electromagnetic field value at the load using the element electromagnetic field information and candidate excitation coefficients consisting of input amplitude and input phase for each element antenna.

[0046] In the active reflection coefficient calculation process of step ST1020, the active reflection coefficient calculation unit 130 (active reflection coefficient calculation device 130') of the control device 100 (100A) (closed space information calculation device 100A') calculates the active reflection coefficient based on the complex reflection coefficient information and the candidate excitation coefficient. When the active reflection coefficient calculation unit 130 (active reflection coefficient calculation device 130') obtains candidate excitation coefficient values ​​from the objective function calculation unit 142 of the excitation coefficient evaluation unit 140 (excitation coefficient evaluation device 140'), it refers to the complex reflection coefficient information previously stored in the storage unit 110 (storage device 110') and calculates the active reflection coefficient for each element antenna using the complex reflection coefficient information and the candidate excitation coefficient.

[0047] The control device 100 (100A) (closed space information computing device 100A') then performs an excitation coefficient evaluation process (step ST1030 "excitation coefficient evaluation"). In the process of step ST1030, the excitation coefficient evaluation unit 140 (excitation coefficient evaluation device 140') of the control device 100 (100A) (closed space information computing device 100A') determines the excitation coefficient using an objective function that includes a first target value for evaluating the power for each region in the closed space and a second target value for evaluating the active reflection coefficient. The excitation coefficient evaluation unit 140 (excitation coefficient evaluation device 140') uses the objective function to determine an excitation coefficient such that the ratio of power consumption between the region including a part of the load and the region other than that region is less than or equal to the first target value, and the active reflection coefficient is less than or equal to the second target value. The excitation coefficient evaluation unit 140 (excitation coefficient evaluation device 140') outputs the determined excitation coefficient as a final value to the amplifier 210 and phase shifter 220 of the array antenna 200.

[0048] After executing the process in step ST1030, the control device 100 (100A) (closed space information computing device 100A') then executes a termination determination process (step ST1040 "Termination?"). In the termination determination process of step ST1040, a control unit (not shown) of the control device 100 (100A) (closed space information computing device 100A') determines, for example, whether to terminate the process of the control device 100 (100A) (closed space information computing device 100A') according to an external termination command or execution program. If the control device 100 (100A) (closed space information computing device 100A') determines in the termination determination process of step ST1040 that it should not terminate (step ST1040 "Termination?" "NO"), it returns to the process of step ST1010 and repeats execution from the process of step ST1010. If the control device 100 (100A) (closed space information computing device 100A') determines to terminate in the termination determination process of step ST1040 (step ST1040 "Termination?" "YES"), it terminates the process shown in Figure 5 ("Termination").

[0049] The control device (closed space information computing device) according to this embodiment, with the configuration described above, can realize a desired electromagnetic field distribution that satisfies the first target value within the closed space by considering multiple scattering and reflection from the load within the closed space, and can also reduce the active reflection coefficient to a second target value or less. When electromagnetic waves are irradiated onto a load placed inside the closed space using an array antenna, it is possible to control the desired composite electromagnetic field and the reduction of the active reflection coefficient in a balanced manner.

[0050] The control device according to this embodiment includes, for example, one configured as follows: [1] A control device for controlling an array antenna that irradiates an electromagnetic wave onto a load placed inside a closed space, comprising: a composite electromagnetic field calculation unit that calculates a radiated electromagnetic field value at the load by referring to pre-stored element electromagnetic field information which is information showing the distribution of element electromagnetic fields generated when each element antenna constituting the array antenna is excited, and using the element electromagnetic field information and candidate excitation coefficients consisting of input amplitude and input phase for each element antenna; an active reflection coefficient calculation unit that calculates an active reflection coefficient at each element antenna by referring to pre-stored complex reflection coefficient information which is information on the complex reflection coefficient at each element antenna generated by the excitation, and using the complex reflection coefficient information and candidate excitation coefficients; and an excitation coefficient evaluation unit that determines an excitation coefficient such that the ratio of power consumption between a region including a part of the load and a region other than that region is less than or equal to the first target value and the active reflection coefficient is less than or equal to the second target value, using the radiated electromagnetic field value, the active reflection coefficient, a first target value, a second target value, an excitation coefficient, a radiated electromagnetic field value, and an active reflection coefficient as an objective function, A control device equipped with the above. This disclosure provides a control device that enables a balanced control of the desired composite electromagnetic field and the reduction of the active reflection coefficient when electromagnetic waves are irradiated onto a load placed inside a closed space using an array antenna.

[0051] The antenna device according to this embodiment includes, for example, one configured as follows:

[10] A plurality of element antennas constituting an array antenna that irradiates an electromagnetic wave onto a load placed inside a closed space, each of the element antennas being connected to an amplifier and a phase shifter; a composite electromagnetic field calculation unit that calculates the radiated electromagnetic field value at the load by referring to pre-stored element electromagnetic field information which is information showing the distribution of element electromagnetic fields generated when each element antenna constituting the array antenna is excited, and using the element electromagnetic field information and candidate excitation coefficients consisting of input amplitude and input phase for each element antenna; an active reflection coefficient calculation unit that calculates the active reflection coefficient at each element antenna by referring to pre-stored complex reflection coefficient information which is information on the complex reflection coefficient at each element antenna generated by the excitation, and using the complex reflection coefficient information and candidate excitation coefficients; An antenna device comprising: an excitation coefficient evaluation unit that uses the radiated electromagnetic field value, the active reflection coefficient, and an objective function including a first target value, a second target value, an excitation coefficient, the radiated electromagnetic field value, and the active reflection coefficient to determine an excitation coefficient such that the ratio of power consumption between a region including a part of the load and a region other than that region is less than or equal to the first target value and the active reflection coefficient is less than or equal to the second target value, and outputs the excitation coefficient to the amplifier and phase shifter of the element antenna. Thus, the present disclosure has the effect of providing an antenna device that enables balanced control of a desired composite electromagnetic field and a reduction in the active reflection coefficient when electromagnetic waves are irradiated onto a load placed inside a closed space using an array antenna.

[0052] The control method according to this embodiment includes, for example, one configured as follows:

[11] A control method by a control device for controlling an array antenna that irradiates an electromagnetic wave onto a load placed inside a closed space, wherein the control device refers to pre-stored element electromagnetic field information, which is information indicating the distribution of element electromagnetic fields generated when each element antenna constituting the array antenna is excited, and uses the element electromagnetic field information and candidate excitation coefficients consisting of input amplitude and input phase for each element antenna to calculate the radiated electromagnetic field value at the load; the control device refers to pre-stored complex reflection coefficient information, which is information on the complex reflection coefficient at each element antenna generated by the excitation, and uses the complex reflection coefficient information and candidate excitation coefficients to calculate the active reflection coefficient at each element antenna; and the control device uses the radiated electromagnetic field value, the active reflection coefficient, and an objective function including a first target value, a second target value, an excitation coefficient, a radiated electromagnetic field value, and an active reflection coefficient to determine an excitation coefficient such that the ratio of power consumption between a region including a part of the load and a region other than that region is less than or equal to the first target value and the active reflection coefficient is less than or equal to the second target value. A control method characterized by the above. This disclosure provides a control method that enables a balanced control of the desired composite electromagnetic field and the reduction of the active reflection coefficient when electromagnetic waves are irradiated onto a load placed inside a closed space using an array antenna.

[0053] The control device according to this embodiment further includes, for example, one configured as follows: [2] The control device according to [1], wherein the objective function is a function that includes: a first evaluation function with the first target value and excitation coefficient as variables; a second evaluation function with the second target value and excitation coefficient as variables; weights that determine the balance between the first evaluation function and the second evaluation function; a radiated electromagnetic field value; and an active reflection coefficient. This disclosure further provides a control device that enables balanced control of a desired composite electromagnetic field and a reduction in the active reflection coefficient when electromagnetic waves are irradiated onto a load placed inside a closed space using an array antenna. Furthermore, this disclosure achieves the same effect as above by applying the above configuration to the antenna device or the above control method.

[0054] The control device according to this embodiment further includes, for example, one configured as follows: [3] A control device according to [2], further comprising a region definition unit that defines, based on information of a region that has been received and stored in advance (including a region that has been received and stored in advance before processing), a maximization region that includes a region in which power is concentrated inside a closed space, a minimization region which is a region other than the maximization region, and power evaluation points in each of the regions, wherein the first evaluation function consists of a plurality of statistical values ​​using the power values ​​of the power evaluation points in each of the minimization region and the maximization region when the excitation coefficient given to the excitation coefficient evaluation unit is used, and the first target value, and the second evaluation function consists of statistical values ​​of the active reflection coefficient of each element antenna when the excitation coefficient given to the excitation coefficient evaluation unit is used, and the second target value, characterized in that the control device. This disclosure further provides a control device that enables balanced control of the desired composite electromagnetic field and reduction of the active reflection coefficient when irradiating a load placed inside a closed space with electromagnetic waves using an array antenna. Furthermore, this disclosure achieves similar effects by applying the above configuration to the above antenna device or the above control method.

[0055] The control device according to this embodiment further includes, for example, one configured as follows: [5] A control device according to [1], [2], [3], or [4], further comprising a storage unit that stores in advance the element electromagnetic field information and the complex reflection coefficient information. This disclosure further provides a control device that enables balanced control of a desired composite electromagnetic field and reduction of the active reflection coefficient when electromagnetic waves are irradiated onto a load placed inside a closed space using an array antenna. Furthermore, this disclosure achieves the same effect as above by applying the above configuration to the antenna device or the control method.

[0056] Embodiment 2. In Embodiment 1, the domain definition defined a domain where power is concentrated and a domain where power is not concentrated. Embodiment 2 describes a domain definition that considers the domain between the domain where power is concentrated and the domain where power is not concentrated. In Embodiment 2, for components of Embodiment 2 that are the same as those of Embodiment 1 already described, redundant explanations will be omitted as appropriate.

[0057] Next, an example of the configuration of the control device (closed space information computing device) according to Embodiment 2 of this disclosure will be described. Figure 6 is a diagram showing an example of the configuration of the control device (closed space information computing device) according to Embodiment 2 of this disclosure.

[0058] The control device (closed space information calculation device) 100 (100B) shown in Figure 6 is composed of a storage unit 110 (storage device), a composite electromagnetic field calculation unit 120 (composite electromagnetic field calculation device), an active reflection coefficient calculation unit 130 (active reflection coefficient calculation device), an excitation coefficient evaluation unit 140 (excitation coefficient evaluation device), and a domain definition unit 150 (domain definition device).

[0059] The region definition unit 150 defines regions within a closed space that include regions where power is concentrated. Based on region information received and stored in advance, the region definition unit 150 defines a minimization region which is a region where power is minimized within the closed space, a concentration region which is a region where power is concentrated, an expansion region which is the region between the concentration region and the minimization region, a maximization region which is the region where power is maximized within the closed space, and power evaluation points for each of these regions. For example, the region definition unit 150 defines the concentration region using region information received and stored in advance, defines an expansion region which is an extension around the concentration region, defines the region which is the region which is the region which is the region which is the region which is maximized within the closed space. Furthermore, when the control device (closed space information computing device) 100 (100B) is applied to the antenna device, the closed space information computing device 100 (100B') includes a region definition device 150 (150') corresponding to the region definition unit 150, although this embodiment omits the illustration and description.

[0060] In this configuration, the objective function is configured as follows: The first evaluation function included in the objective function consists of a plurality of statistical values ​​using the power values ​​of the power evaluation points in each of the minimization region, the concentration region, and the maximization region, when a certain excitation coefficient given to the excitation coefficient evaluation unit is used, and the first target value. The plurality of statistical values ​​include values ​​for evaluating the power values ​​of the evaluation points (power evaluation points) and values ​​for evaluating the power distribution of the evaluation points (power evaluation points).

[0061] The second evaluation function included in the objective function consists of the statistical value of the active reflection coefficient of each element antenna when a certain excitation coefficient given to the excitation coefficient evaluation unit is used, and the second target value.

[0062] Here, the definition of the region in this embodiment will be explained. Figure 7 is a diagram illustrating the region defined in the control device (closed space information computing device) according to Embodiment 2 of this disclosure. The power maximization region (maximization region 330) in the closed space 300 consists of the following two regions.

[0063] The first region is the concentration region 310. The concentration region 310 is a region within the maximization region 330 where it is desired to concentrate power in particular, and the minimum and maximum values ​​of its position are "x" ｉ，ｍａｘ － ", "x ｉ，ｍａｘ ＋ " is defined as follows.

[0064] The second region is the extended region 320. The extended region 320 is the region surrounding the concentrated region 310, and "x ｉ，ｍａｘ － "From x (hat) ｉ Δ in the negative direction of the axis ｉ － , “x ｉ，ｍａｘ ＋ "From x (hat) ｉ Δ in the positive direction of the axis ｉ ＋ It is defined as the region obtained by excluding the concentrated region from the expanded region.

[0065] There may be multiple maximization regions 330. The remaining region after removing the maximization regions 330 from the closed space 300 is defined as the minimization region 340.

[0066] In Embodiment 2, the objective function f shown in equation (3) below is calculated for these domain definitions: f(w) = 10log １０ (D １ [p １ (w, G １１ )+p ２ (w, G １２ )]+D ２ q(w, G ２ )) ... (3)

[0067] p １ (First evaluation function p) １ ), p ２ (Second first evaluation function p) ２ ), and specific examples of the second evaluation function q are shown below. Here, the variable P represents power, and its subscripts min, max, and con indicate that the power is a value selected from the minimization region, maximization region, and concentration region. | | represents the absolute value. avg(), min(), and max() are functions that calculate the average, minimum, and maximum values ​​in a specified region, respectively. max(Γ ａ (w)) is the active reflection coefficient Γ ａ These represent the maximum values ​​of (w). Also, the first target value G １１ and G １２ This is the first evaluation function p １ and p ２ Two definitions are provided accordingly.

[0068] The first evaluation function p that constitutes the objective function １ and the first evaluation function p ２ By constructing it as shown in equations (4) and (5) above, the following effects are obtained, respectively. First evaluation function p １ This makes the maximum value within the maximization region larger and the average value within the minimization region smaller. If the evaluation of the minimization region is based on the maximum value of that region instead of the average value, then the power of the tail extending from the maximization region will be evaluated. In this case, only the power of the maximization region is evaluated, and the distribution within the minimization region cannot be correctly evaluated, so the average value that can consider the influence of the entire minimization region is used in the numerator. The second first evaluation function p ２ This is the objective function for evaluating the flatness of the power distribution in the power concentration region. When the number of element antennas is small, there is no abrupt change in power between the maximization region and the minimization region, resulting in a smooth power distribution near the boundary between the maximization and minimization regions. On the other hand, if we try to suppress the spread into the minimization region, a region of low power will be created within the maximization region. This problem is solved by limiting the evaluation to the concentration region.

[0069] Furthermore, equations (4), (5), and (6) each represent the target value "G". １１ ", "G １２ ", "G ２The values ​​are normalized using the `--` parameter. Although both power distribution and active reflection coefficient are values ​​that result from the excitation coefficient, they are different physical quantities. In order to evaluate them in a unified manner, normalization is performed in each objective function.

[0070] The effects of the present invention are demonstrated by specific numerical calculations. Figure 8 shows an example of an antenna and a closed space controlled by a control device (closed space information computing device) according to Embodiment 2 of this disclosure. Figure 8A is a view from above and through the antenna, and Figure 8B is a cross-sectional view along the y-z plane in Figure 8A. Figure 8 shows an example of an array antenna installed in a closed space 300. The antenna has 25 elements and is composed of a general microstrip antenna (element antenna) 230 (230'). The five surfaces other than the antenna installation surface are all assumed to be perfect conductors as their medium. A layer of water (load 1000) with a thickness of 10 mm is spread across the closed space 300, 5 mm above the bottom surface in the z-axis direction. At the center of this water (load 1000) (the surface 10 mm above the bottom surface in the z-axis direction), a region of ±82.5 mm in the x and y axes from the center is heated. Figures 9, 10, and 11 show the calculation results.

[0071] Figure 9 is an example of the calculation results under the first condition by the control device (closed space information computing device) according to Embodiment 2 of this disclosure, where Figure 9A shows the power distribution in the central region of the load (water) and Figure 9B shows the active reflection coefficient. Figure 10 is an example of the calculation results under the second condition by the control device (closed space information computing device) according to Embodiment 2 of this disclosure, where Figure 10A shows the power distribution in the central region of the load (water) and Figure 10B shows the active reflection coefficient. Figure 11 is an example of the calculation results under the third condition by the control device (closed space information computing device) according to Embodiment 2 of this disclosure, where Figure 11A shows the power distribution in the central region of the load (water) and Figure 11B shows the active reflection coefficient. Figures 9A, 10A, and 11A represent the power distribution in the central region of the water. Figures 9B, 10B, and 11B represent the active reflection coefficient at the antenna end of each element antenna. The calculation conditions differ in Figures 9, 10, and 11.

[0072] First, in the calculations shown in Figures 9A and 9B, the expansion region is set to 0, meaning the maximization region and the concentration region are the same size. Also, the weight D １ 1, weight D ２ Since is set to 0, the active reflection coefficient is not considered in the calculation of the objective function shown in equation (3). In the calculations for Figures 10A and 10B, the concentration region is set to ±62.5 mm in the x and y directions. The weight D is the same as in the calculations for Figures 9A and 9B. １ 1, weight D ２ This is set to 0. In the calculations for Figures 10A and 10B, the concentration region is set to ±62.5 mm in the x and y directions. Also, weight D １ 0.75, weight D ２ The value is set to 0.25. Comparing Figure 9A and Figure 10A, it can be seen that the power is more concentrated in Figure 10A, where a concentration region is defined. Furthermore, comparing Figures 9B, 10B, and 11B, in the first two cases, elements with extremely large active reflection coefficients are observed, while in Figure 11B, the active reflection coefficient is suppressed (the dispersion of active reflection coefficients per element is smaller). Also, Figures 10A and 11A are almost the same, with the power concentrated near the desired region. From the above, it can be confirmed that calculating the excitation coefficient using the proposed objective function has the effect of reducing the active reflection coefficient while obtaining the desired electromagnetic field distribution.

[0073] Next, an example of processing by the control device (closed space information computing device) according to Embodiment 2 of the present disclosure will be described. Figure 12 is a flowchart showing an example of processing by the control device (closed space information computing device) according to Embodiment 2 of the present disclosure. When the control device (closed space information computing device) 100 (100B) receives a processing start command from, for example, a control unit (not shown), it starts the processing shown in Figure 12 ("start").

[0074] The control device (closed space information computing device) 100 (100B) then executes a power maximization area definition process (step ST2010 "power maximization area definition"). In the power maximization area definition process of step ST2010, the area definition unit 150 (area definition device) of the control device (closed space information computing device) 100 (100B) defines a maximization area, which is an area that combines a centralized area and an extended area, and is an area that maximizes power within the closed space. Specifically, for example, the area definition unit 150 (area definition device) first defines the centralized area using area information that has been received and stored in advance. The area definition unit 150 (area definition device) defines an extended area that is extended around the centralized area. The area that combines the centralized area and the extended area is defined as the maximization area.

[0075] The control device (closed space information computing device) 100 (100B) then executes a power minimization region definition process (step ST2020 "power minimization region definition"). In the power minimization region definition process of step ST2020, the region definition unit 150 (region definition device) of the control device (closed space information computing device) 100 (100B) defines the region other than the maximization region as the minimization region.

[0076] The control device (closed space information calculation device) 100 (100B) then executes a power value evaluation process (step ST2030 "power value evaluation"). In the power value evaluation process of step ST2030, the composite electromagnetic field calculation unit 120 (composite electromagnetic field calculation device 120') and the excitation coefficient evaluation unit 140 (excitation coefficient evaluation device 140') of the control device (closed space information calculation device) 100 (100B) evaluate the power values ​​of the evaluation points in each region defined by the region definition unit 150 (region definition device). The excitation coefficient evaluation unit 140 (excitation coefficient evaluation device 140') evaluates the first evaluation function p in the objective function １ The power value of the evaluation point (power evaluation point) is evaluated based on this.

[0077] The control device (closed space information calculation device) 100 (100B) then executes a power distribution evaluation process (step ST2040 "power distribution evaluation"). In the power distribution evaluation process of step ST2040, the composite electromagnetic field calculation unit 120 (composite electromagnetic field calculation device 120') and the excitation coefficient evaluation unit 140 (excitation coefficient evaluation device 140') of the control device (closed space information calculation device) 100 (100B) evaluate the power distribution of evaluation points in each region defined by the region definition unit 150 (region definition device). The excitation coefficient evaluation unit 140 (excitation coefficient evaluation device 140') evaluates the second first evaluation function p in the objective function ２ The power distribution of the evaluation points (power evaluation points) is evaluated based on this.

[0078] The control device (closed space information calculation device) 100 (100B) then executes the evaluation point information output process (step ST2050 "evaluation point information output"). In the evaluation point information output process of step ST2050, the excitation coefficient evaluation unit 140 (excitation coefficient evaluation device 140') of the control device (closed space information calculation device) 100 (100B) outputs evaluation point information for evaluation points that satisfy the conditions as a result of the evaluation in the power value evaluation process of step ST2030 and the power distribution evaluation process of step ST2040. The control device (closed space information calculation device) 100 (100B) then terminates the process shown in Figure 12 ("termination").

[0079] The control device according to this embodiment improves the accuracy of evaluating power values ​​in each region through the configuration described above. Furthermore, it can consider the power distribution near the boundary between regions where power is to be concentrated and regions where power is not to be concentrated, thereby improving the concentration of power in the regions where power is to be concentrated.

[0080] The control device according to this embodiment further includes, for example, one configured as follows: [4] A control device according to [2], further comprising a region definition unit that defines, based on region information received and stored in advance, a minimization region which is a region in which power is minimized within the closed space, a concentration region which is a region in which power is concentrated, an expansion region which is the region between the concentration region and the minimization region, a maximization region which is a region formed by combining the concentration region and the expansion region and in which power is maximized within the closed space, and power evaluation points in each of the said regions, wherein the first evaluation function consists of a plurality of statistical values ​​using the power values ​​of the power evaluation points in each of the regions, the minimization region, and the maximization region, when the excitation coefficient given to the excitation coefficient evaluation unit is used, and the first target value, and the second evaluation function consists of statistical values ​​of the active reflection coefficient of each element antenna, when the excitation coefficient given to the excitation coefficient evaluation unit is used, and the second target value, characterized in that the control device. This disclosure further provides a control device that enables balanced control of the desired composite electromagnetic field and reduction of the active reflection coefficient when irradiating a load placed inside a closed space with electromagnetic waves using an array antenna. Furthermore, this disclosure achieves similar effects by applying the above configuration to the above antenna device or the above control method.

[0081] Embodiment 3. In the control device (closed space information computing device) and antenna device according to Embodiments 1 and 2, the excitation coefficient is optimized on the premise that all elements of the array antenna are used. However, as the number of elements increases, multiple scattering also increases, so the active reflection coefficient tends to increase. Embodiment 3 describes a configuration in which element antennas that satisfy the above conditions can be registered as a group of elements to be used. In Embodiment 3, for components of Embodiment 3 that are the same as those of Embodiment 1 or Embodiment 2 already described, redundant explanations will be omitted as appropriate.

[0082] Next, an example of the configuration of the control device (closed space information computing device) according to Embodiment 3 of this disclosure will be described. Furthermore, a detailed example of the configuration of an antenna device to which the control device (closed space information computing device) is applied will be described. Figure 13 is a diagram showing an example of the configuration of the control device (closed space information computing device) according to Embodiment 3 of this disclosure. Figure 14 is a diagram showing an example of the configuration of an antenna device to which the control device (closed space information computing device) according to Embodiment 3 of this disclosure is applied. The control device (closed space information computing device) 100 (100C) shown in Figure 13 includes a storage unit 110 (storage device), a composite electromagnetic field calculation unit 120 (composite electromagnetic field calculation device), an active reflection coefficient calculation unit 130 (active reflection coefficient calculation device), an excitation coefficient evaluation unit 140 (excitation coefficient evaluation device), and a device usage determination unit 160 (device usage determination device). In other words, the control device (closed space information computing device) 100 (100C) further includes a component usage determination unit 160 (component usage determination device) in addition to the configuration of the control device (closed space information computing device) 100 already described.

[0083] The element usage determination unit 160 (element usage determination device) determines the elements to be used in the array antenna. The element usage determination unit 160 (element usage determination device) extracts a group of elements from the array antenna, including one or more element antennas, such that the maximum gain in the power irradiation region, which is a region that has been received and stored in advance, is equal to or greater than a gain target value that has been stored in advance.

[0084] The excitation coefficient evaluation unit 140 (excitation coefficient evaluation device) calculates the excitation coefficient of one or more element antennas included in the group of elements used, which has been extracted by the element used determination unit 160 (element used determination device).

[0085] Next, a detailed example of the configuration of an antenna device to which the control device (closed-space information computing device) according to Embodiment 3 of this disclosure is applied will be described. The closed-space information computing device 100 (100C') (control device) in the antenna device 10 (10C) further comprises a device for determining the element to be used 160 (160') (an element for determining the element to be used). The device for determining the element to be used 160 (160') extracts element antennas whose maximum gain in a desired power irradiation area (irradiation area 350) is equal to or greater than the target gain value. The device for determining the element to be used 160 (160') (an element for determining the element to be used) retrieves element electromagnetic field information from the storage device 110 (110') (storage unit) and searches for element antennas that can irradiate the area to be heated with power equal to or greater than a certain threshold. Element antennas that satisfy the conditions obtained as a result of the search are registered as a group of elements to be used 231, and element antennas that do not satisfy the conditions are registered as a group of unused elements 232. The excitation coefficient is calculated only for the element group 231 that is in use, and the excitation coefficients of the element antennas belonging to the unused element group 232 are all set to 0 or their operation as antennas is stopped. This effect makes it possible to achieve the desired distribution while reducing the possibility of an increase in the active reflection coefficient.

[0086] The excitation coefficient evaluation device 140 (140C') calculates the excitation coefficient of one or more element antennas (group of elements used) extracted by the element usage determination device 160 (160').

[0087] Next, an example of processing in the control device (closed-space information computing device) according to Embodiment 3 of the present disclosure will be described. Figure 15 is a flowchart showing an example of processing in the control device (closed-space information computing device) according to Embodiment 3 of the present disclosure. When the control device (closed-space information computing device) 100 (100C) receives a processing start command from, for example, a control unit (not shown), it starts the processing shown in Figure 15 ("start").

[0088] The control device (closed space information calculation device) 100 (100C) then executes the element electromagnetic field information retrieval process (step ST3010 "element electromagnetic field information retrieval"). In the element electromagnetic field information retrieval process of step ST3010, the element usage determination unit 160 (element usage determination device 160') of the control device (closed space information calculation device) 100 (100C) retrieves element electromagnetic field information from the storage unit 110 (storage device 110').

[0089] The control device (closed space information computing device) 100 (100C) then executes an element antenna search process (step ST3020 "element antenna search"). In the element antenna search process of step ST3020, the element usage determination unit (element usage determination device) 160 of the control device (closed space information computing device) 100 (100C) retrieves information of a region that has been received and stored in advance, and searches for an element antenna that can irradiate the region to be heated, as indicated in the information of that region, with power above a certain threshold.

[0090] The control device (closed space information computing device) 100 (100C) then executes the process of registering used and unused elements (step ST3030 "Registering Used and Unused Elements"). In the process of registering used and unused elements in step ST3030, the used element determination unit (used element determination device) 160 of the control device (closed space information computing device) 100 (100C) registers the element antennas that satisfy the conditions obtained as a result of the element antenna search process in step ST3020 as a group of used elements 231. The used element determination unit (used element determination device) 160 registers the element antennas that do not satisfy the conditions as an unused element group 232. After executing the process in step ST3030, the control device (closed space information computing device) 100 (100C) then terminates the process shown in Figure 15 ("Termination"). Subsequently, the excitation coefficient evaluation unit 140 (excitation coefficient evaluation device) calculates the excitation coefficients of one or more element antennas included in the group of elements used, which have been extracted by the element used determination unit 160 (element used determination device). The excitation coefficient calculation is performed only for the group of elements used 231, and the excitation coefficients of element antennas belonging to the unused element group 232 are all set to 0, or their operation as antennas is stopped.

[0091] The control device according to this embodiment, with the configuration described above, can achieve the desired distribution while reducing the possibility of an increase in the active reflection coefficient.

[0092] The control device according to this embodiment further includes, for example, one configured as follows: [6] A control device according to [1], [2], [3], [4] or [5], further comprising a unit for determining the element to be used, wherein the unit for determining the element to be used extracts a group of elements to be used, including one or more element antennas, from the array antenna, such that the maximum gain in the power irradiation region, which is a region that has been received and stored in advance, is equal to or greater than a gain target value that has been stored in advance, and the excitation coefficient evaluation unit calculates the excitation coefficient of one or more element antennas included in the group of elements to be used. This disclosure further provides the effect that it is possible to achieve a desired distribution while reducing the possibility of an increase in the active reflection coefficient, and that it is possible to provide a control device that enables a balanced control of the desired composite electromagnetic field and the reduction of the active reflection coefficient when electromagnetic waves are irradiated onto a load placed inside a closed space using an array antenna. Furthermore, this disclosure provides the same effect as above by applying the above configuration to the above antenna device or the above control method.

[0093] Embodiment 4. In the control device (closed space information computing device) and antenna device according to Embodiments 1 and 2 described above, the shape of the load is assumed to be known in advance, and element electromagnetic field information corresponding to that load is retrieved from the storage device. Embodiment 4 describes an example of a configuration in which the load is identified and element electromagnetic field information corresponding to the identified load is used. In Embodiment 4, for components of Embodiment 4 that are the same as those of Embodiments 1, 2, or 3 described above, redundant explanations will be omitted as appropriate.

[0094] Next, an example of the configuration of a control device (closed-space information computing device) according to Embodiment 4 of this disclosure will be described. Furthermore, a detailed example of the configuration of an antenna device to which the control device (closed-space information computing device) is applied will be described. Figure 16 is a diagram showing an example of the configuration of a control device (closed-space information computing device) according to Embodiment 4 of this disclosure. The control device (closed-space information computing device) 100 (100D) has a function of identifying loads. The control device (closed-space information computing device) 100 (100D) shown in Figure 16 is composed of a storage unit 110 (storage device), a composite electromagnetic field calculation unit 120 (composite electromagnetic field calculation device), an active reflection coefficient calculation unit 130 (active reflection coefficient calculation device), an excitation coefficient evaluation unit 140 (excitation coefficient evaluation device), and a load identification unit 170 (load identification device). The control device (closed-space information computing device) 100 (100D) shown in Figure 16 is connected to an array antenna 200 and a load identification sensor 400, respectively.

[0095] The load identification sensor 400 measures one or more of the following: the position, shape, temperature, or reflected power of the load. The load identification unit 170 (load identification device) identifies the load within the closed space 300. The load identification unit 170 identifies the load based on one or more of the following: the position, shape, temperature, or reflected power of the load, which are the measurement results of the load identification sensor 400 that measures the load in the closed space, and outputs load information indicating the load. The load identification unit 170 outputs the load information to the composite electromagnetic field calculation unit 120.

[0096] The element electromagnetic field information read out by the composite electromagnetic field calculation unit 120 is the element electromagnetic field information corresponding to the load indicated in the load information, from among the element electromagnetic field information stored in advance.

[0097] Next, a detailed configuration example of an antenna device to which the control device (closed-space information computing device) according to Embodiment 4 of this disclosure is applied will be described. Figure 17 is a diagram showing an example of the configuration of an antenna device to which the control device (closed-space information computing device) according to Embodiment 4 of this disclosure is applied. In addition to the configuration of the antenna device 10 already described, the antenna device 10 (10D) further includes a load identification sensor 400 and a load identification device 170 (170') (load identification unit) in the closed-space information computing device 100 (100D'). The load identification sensor 400 measures one or more of the position and shape of the load, temperature, and reflected power. The load identification device 170 (170') identifies load information from one or more of the position, shape, temperature, and reflected power. The element electromagnetic field information read from the storage device by the composite electromagnetic field computing device is the closest to the load measured by the load identification sensor 400 among all the element electromagnetic field information contained in the storage device 110 (110'). In Embodiment 4, a load identification sensor 400 that measures the position, shape, and temperature of a load such as an optical camera and an infrared camera, or a load identification sensor 400 such as an antenna that measures the electrical characteristics of a load, is provided in a closed space. The information measured by the load identification sensor 400 is sent to a load identification device 170 (170') in a closed space information computing device 100 (100D'). Based on this information, the load identification device 170 (170') identifies what the load is and passes the element electromagnetic field information for the load closest to the identified load to the composite electromagnetic field computing device 120 (120'). The determination of proximity can be made using any index that is obtained from the difference between the material information such as shape, position, temperature, and dielectric constant and the stored element electromagnetic field information of the load, but a definition such as the sum of the absolute values ​​of the differences of each piece of information is preferable. By providing the above functions, the excitation coefficient can be optimized according to the load.

[0098] Next, an example of processing by the control device (closed space information computing device) according to Embodiment 4 of the present disclosure will be described. Figure 18 is a flowchart showing an example of processing by the control device (closed space information computing device) according to Embodiment 4 of the present disclosure. When the control device (closed space information computing device) 100 (100D) receives a processing start command from a control unit (not shown), for example, it starts the processing shown in Figure 18 ("start").

[0099] The control device (closed space information calculation device) 100 (100D) then executes a load identification information acquisition process (step ST4010 "Load Identification Information Acquisition"). In the load identification information acquisition process of step ST4010, the load identification unit (load identification device) 170 of the control device (closed space information calculation device) 100 (100D) receives the measurement result of the load identification sensor 400 that measures the load in the closed space.

[0100] The control device (closed space information calculation device) 100 (100D) then performs load identification processing (step ST4020 "load identification"). In the load identification processing of step ST4020, the load identification unit (load identification device) 170 of the control device (closed space information calculation device) 100 (100D) identifies the load based on one or more of the load's position, shape, temperature, or reflected power, as indicated by the measurement results from the load identification sensor 400. The load identification unit (load identification device) 170 outputs load information indicating the load to the composite electromagnetic field calculation unit 120.

[0101] The control device (closed space information calculation device) 100 (100D) then performs a process to select element electromagnetic field information for the identified load (step ST4030 "Select element electromagnetic field information for the identified load"). In the process of step ST4030, when the composite electromagnetic field calculation unit 120 of the control device (closed space information calculation device) 100 (100D) receives load information from the load identification unit (load identification device) 170, it selects and retrieves element electromagnetic field information corresponding to the load indicated in the load information from the element electromagnetic field information stored in advance. After the control device (closed space information calculation device) 100 (100D) has performed the process of step ST4030, it then terminates the process shown in Figure 18 ("Termination").

[0102] The control device according to this embodiment can optimize the excitation coefficient according to the load, as described above.

[0103] The control device according to this embodiment further includes, for example, one configured as follows: [7] A control device according to [1], [2], [3], [4], or [5], further comprising a load identification unit, wherein the load identification unit identifies a load based on one or more of the position, shape, temperature, or reflected power of the load, which are measurement results of a load identification sensor that measures the load in the closed space, and outputs load information indicating the said load, and the element electromagnetic field information read out by the composite electromagnetic field calculation unit is element electromagnetic field information corresponding to the load indicated in the load information from among the element electromagnetic field information stored in advance. This provides the effect that the present disclosure can further output an appropriate excitation coefficient according to the load, and can provide a control device that can balance control of the desired composite electromagnetic field and the reduction of the active reflection coefficient when electromagnetic waves are irradiated to a load placed inside a closed space using an array antenna. Furthermore, the present disclosure can achieve the same effect as above by applying the above configuration to the above antenna device or the above control method.

[0104] Embodiment 5. Embodiment 4, which has already been described, includes a configuration in which, once the load is identified and the excitation coefficient is determined, the settings remain unchanged. On the other hand, if the dielectric constant of the load has temperature characteristics, the optimal excitation coefficient will fluctuate depending on the temperature. Embodiment 5 describes a configuration that enables the identification of repeated loads. In Embodiment 5, for components related to Embodiment 5 that are the same as those related to Embodiments 1, 2, 3, or 4, which have already been described, redundant explanations will be omitted as appropriate.

[0105] Next, an example of the configuration of a control device (closed-space information computing device) according to Embodiment 5 of this disclosure will be described. Furthermore, a detailed example of the configuration of an antenna device to which the control device (closed-space information computing device) is applied will be described. Figure 19 is a diagram showing an example of the configuration of a control device (closed-space information computing device) according to Embodiment 5 of this disclosure. The control device (closed-space information computing device) 100 (100E) is configured to include a storage unit (memory device) 110, a composite electromagnetic field calculation unit (composite electromagnetic field calculation device) 120, an active reflection coefficient calculation unit (active reflection coefficient calculation device) 130, an excitation coefficient evaluation unit (excitation coefficient evaluation device) 140, and a load identification unit (load identification device) 170. The control device (closed-space information computing device) 100 (100E) is connected to an array antenna 200, a load identification sensor 400, and a timing unit (timer) 500. The array antenna 200 and the load identification sensor 400 are the same as those already described. The timing unit (timer) 500 has a timing function. The timing unit (timer) 500 starts timing based on a command from the control device (closed space information calculation device) 100 (100E), and operates the load identification sensor 400 and the load identification unit 170 (load identification device) at intervals of the time measured by the timing unit (timer) 500. The load identification unit 170 (load identification device) identifies a load at intervals measured by the timing unit (timer) 500 and outputs load information indicating that load.

[0106] Next, an example of the configuration of an antenna device to which the control device (closed space information computing device) according to Embodiment 5 of this disclosure is applied will be described. Figure 20 is a diagram showing an example of the configuration of an antenna device to which the control device (closed space information computing device) according to Embodiment 5 of this disclosure is applied. The antenna device 10 (10E) is equipped with a timer 500 (500') in addition to the configuration of the antenna device 10 (10D) described in Embodiment 4. The antenna device 10 (10E) has a function to return measurement results from the load identification device to the load identification sensor at regular intervals. Based on the acquired sensor information, the excitation coefficient evaluation device 140 (140') (excitation coefficient evaluation unit) recalculates the excitation coefficient and sets it on the antenna. In the antenna device 10 (10E) shown in Figure 20, the load identification device 170 (170') (load identification unit) and the timer 500 (500') (timing unit) are connected, and the timer 500 (500') and the load identification sensor 400 are connected.

[0107] Next, an example of processing in the control device (closed space information computing device) according to Embodiment 5 of the present disclosure will be described. Figure 21 is a flowchart showing an example of processing in the control device (closed space information computing device) according to Embodiment 5 of the present disclosure. When the control device (closed space information computing device) 100 (100E) receives a processing start command from a control unit (not shown), for example, it starts the processing shown in Figure 21 ("start").

[0108] The control device (closed space information calculation device) 100 (100E) then executes a load identification information acquisition process (step ST5010 "Load Identification Information Acquisition"). In the load identification information acquisition process of step ST5010, the load identification unit (load identification device) 170 of the control device (closed space information calculation device) 100 (100E) receives the measurement result of the load identification sensor 400 that measures the load in the closed space.

[0109] The control device (closed space information calculation device) 100 (100E) then performs load identification processing (step ST5020 "load identification"). In the load identification processing of step ST5020, the load identification unit (load identification device) 170 of the control device (closed space information calculation device) 100 (100E) identifies the load based on one or more of the load's position, shape, temperature, or reflected power, as indicated by the measurement results from the load identification sensor 400. The load identification unit (load identification device) 170 outputs load information indicating the load to the composite electromagnetic field calculation unit 120.

[0110] The control device (closed space information calculation device) 100 (100E) then executes a process to select element electromagnetic field information for the identified load (step ST5030 "Select element electromagnetic field information for the identified load"). In the process of step ST5030, when the combined electromagnetic field calculation unit 120 of the control device (closed space information calculation device) 100 (100E) receives load information from the load identification unit (load identification device) 170, it selects and retrieves element electromagnetic field information from the element electromagnetic field information stored in advance that corresponds to the load indicated in the load information.

[0111] After executing the process in step ST5030, the control device (closed space information computing device) 100 (100E) then executes a termination determination process (step ST5040 "Termination?"). In the termination determination process of step ST5040, a control unit (not shown) of the control device (closed space information computing device) 100 (100E) determines, for example, whether to terminate the process of the control device (closed space information computing device) 100 according to an external termination command or execution program. If the control device (closed space information computing device) 100 (100E) determines in the termination determination process of step ST5040 that it will not terminate (step ST5040 "Termination?" "NO"), it proceeds to the process of step ST5050.

[0112] The control device (closed space information computing device) 100 (100E) then executes a timing command process (step ST5050 "timing command"). In the timing command process of step ST5050, the load identification unit (load identification device) 170 of the control device (closed space information computing device) 100 (100E) commands the timing unit (timer) 500 to start timing. The timing unit (timer) 500 starts timing in response to the command from the control device (closed space information computing device) 100 (100E).

[0113] The control device (closed space information computing device) 100 (100E) then executes a measurement command process (step ST5060 "measurement command"). In the measurement command process of step ST5060, the timing unit (timer) 500 of the control device (closed space information computing device) 100 (100E) issues a measurement command to the load identification sensor 400 or the load identification unit 170 (load identification device) when the timing is completed. The load identification unit 170 (load identification device) identifies the load based on the measurement result from the load identification sensor 400 at intervals of time measured by the timing unit (timer) 500, and outputs load information indicating the load.

[0114] When the control device (closed space information computing device) 100 (100E) executes the process in step ST5060, it then returns to step ST5010 and repeats the execution from the process in step ST5010.

[0115] If the control device (closed space information computing device) 100 (100E) determines to terminate in the termination determination process of step ST5040 (step ST5040 "Termination?" "YES"), it terminates the process shown in Figure 21 ("Termination").

[0116] The control device according to this embodiment, with the configuration described above, enables optimal power irradiation in response to fluctuations in the load state.

[0117] The control device according to this embodiment further includes, for example, one configured as follows: [8] The control device according to [7], wherein the load identification unit identifies a load at intervals measured by a timer and outputs load information indicating the said load. This further provides a control device that enables power irradiation in response to changes in the state of the load, and enables balanced control of the desired composite electromagnetic field and the reduction of the active reflection coefficient when electromagnetic waves are irradiated onto a load placed inside a closed space using an array antenna. Furthermore, this disclosure achieves the same effects as described above by applying the above configuration to the antenna device or the control method.

[0118] Embodiment 6. In the antenna device and control device described in Embodiment 5, which has already been described, element electromagnetic field information stored in a storage device in advance is input to a composite electromagnetic field calculator, and composite electromagnetic field values ​​at the required positions are obtained by interpolation, etc. Therefore, if a load significantly different from the load stored in advance is installed, it is not possible to calculate a reasonable excitation coefficient by optimization. Embodiment 6 describes a configuration that allows obtaining element electromagnetic field information for calculating the optimal excitation coefficient for any load. In Embodiment 6, for components related to Embodiment 6 that are the same as those related to Embodiments 1, 2, 3, 4, or 5, which have already been described, redundant explanations will be omitted as appropriate.

[0119] Next, an example of the configuration of a control device (closed-space information computing device) according to Embodiment 6 of this disclosure will be described. Furthermore, a detailed example of the configuration of an antenna device to which the control device (closed-space information computing device) is applied will be described. Figure 22 is a diagram showing an example of the configuration of a control device (closed-space information computing device) according to Embodiment 6 of this disclosure. The control device (closed-space information computing device) 100 (100E) calculates the element electromagnetic field based on load information and stores the result in a storage device. The control device (closed-space information computing device) 100 (100E) shown in Figure 22 includes a storage unit 110 (storage device), a composite electromagnetic field calculation unit 120 (composite electromagnetic field calculation device), an active reflection coefficient calculation unit 130 (active reflection coefficient calculation device), an excitation coefficient evaluation unit 140 (excitation coefficient evaluation device), a load identification unit 170 (load identification device), and an electromagnetic field simulation unit (electromagnetic field simulator) 180.

[0120] In addition to the functions of the load identification unit 170 (load identification device) as described in the previously explained embodiment, the load identification unit 170 (load identification device) also outputs load information to the electromagnetic field simulation unit (electromagnetic field simulator) 180.

[0121] The electromagnetic field simulation unit (electromagnetic field simulator) 180 calculates the element electromagnetic field using the load information. The electromagnetic field simulation unit (electromagnetic field simulator) 180 calculates the element electromagnetic field using the load information output by the load identification unit 170, and stores the element electromagnetic field information in the storage unit 110 based on the calculation result.

[0122] Next, an example of the configuration of an antenna device to which the control device (closed-space information computing device) according to Embodiment 6 of this disclosure is applied will be described. Figure 23 is a diagram showing an example of the configuration of an antenna device to which the control device (closed-space information computing device) according to Embodiment 6 of this disclosure is applied. The antenna device 10 (10F) causes the electromagnetic field of the element calculated by the electromagnetic field simulator 180 (180') to be stored in the storage device 110 (110'). The closed-space information computing device 100 (100F') (control device) in the antenna device 10 (10F) includes a memory device 110 (110') (storage unit), a composite electromagnetic field computing device 120 (120') (composite electromagnetic field computing unit), an active reflection coefficient computing device 130 (130') (active reflection coefficient computing unit), an excitation coefficient evaluation device 140 (140') (excitation coefficient evaluation unit), a load identification device 170 (170') (load identification unit), and an electromagnetic field simulator 180 (180') (electromagnetic field simulation unit).

[0123] The electromagnetic field simulator 180 (180') corresponds to the electromagnetic field simulation unit (electromagnetic field simulator) 180 shown in Figure 22. The electromagnetic field simulator 180 (180') calculates the element electromagnetic field based on load information and stores the result in the storage device 110 (110'). The electromagnetic field simulator 180 (180') calculates the element electromagnetic field based on the load information, the shape of the closed space, and the element antenna.

[0124] Next, an example of the processing of the control device (closed space information computing device) according to Embodiment 6 of the present disclosure will be described. Figure 24 is a flowchart showing an example of the processing of the control device (closed space information computing device) according to Embodiment 6 of the present disclosure. When the control device (closed space information computing device) 100 (100F) receives a processing start command from a control unit (not shown), for example, it starts the processing shown in Figure 24 ("start"). Specifically, when the load identification unit (load identification device) 170 outputs load information indicating the load to the composite electromagnetic field calculation unit 120, it outputs the said load information to the electromagnetic field simulation unit (electromagnetic field simulator) 180.

[0125] The control device (closed space information computing device) 100 (100F) then executes a load identification information acquisition process (step ST6010 "Load Identification Information Acquisition"). In the load identification information acquisition process of step ST6010, the electromagnetic field simulation unit (electromagnetic field simulator) 180 of the control device (closed space information computing device) 100 (100F) acquires load information output from the load identification unit (load identification device) 170.

[0126] The control device (closed space information calculation device) 100 (100F) then executes the element electromagnetic field calculation process (step ST6020 "element electromagnetic field calculation"). In the element electromagnetic field calculation process of step ST6020, the electromagnetic field simulation unit (electromagnetic field simulator) 180 of the control device (closed space information calculation device) 100 (100F) calculates the element electromagnetic field using load information and calculates element electromagnetic field information.

[0127] The control device (closed space information calculation device) 100 (100F) then executes the element electromagnetic field information registration process (step ST6030 "Element electromagnetic field information registration"). In the element electromagnetic field information registration process of step ST6030, the electromagnetic field simulation unit (electromagnetic field simulator) 180 of the control device (closed space information calculation device) 100 (100F) outputs the calculated element electromagnetic field information to the storage unit (memory device) 110 for storage. After executing the element electromagnetic field information registration process of step ST6030, the control device (closed space information calculation device) 100 (100F) then terminates the process shown in Figure 24 ("termination").

[0128] The control device according to this embodiment, with the configuration described above, can always obtain element electromagnetic field information for calculating the optimal excitation coefficient for any load.

[0129] The control device according to this embodiment further includes, for example, one configured as follows: [9] A control device according to [7] or [8], further comprising an electromagnetic field simulator, wherein the electromagnetic field simulator calculates the element electromagnetic field using the load information output by the load identification unit, and stores the element electromagnetic field information in a storage unit based on the calculation result. This provides the effect that the present disclosure can further obtain element electromagnetic field information for calculating the optimal excitation coefficient for any load, and can provide a control device that can balance the control of a desired composite electromagnetic field and the reduction of the active reflection coefficient when electromagnetic waves are irradiated onto a load placed inside a closed space using an array antenna. Furthermore, the present disclosure can achieve the same effect as above by applying the above configuration to the antenna device or the above control method.

[0130] Here, we will describe the details of the hardware configuration for realizing the functions of the present disclosure. Figure 25 is a diagram showing a first example of the hardware configuration for realizing the functions according to the configuration of the present disclosure. Figure 26 is a diagram showing a second example of the hardware configuration for realizing the functions according to the configuration of the present disclosure. The control devices (closed space information computing devices) 100 (100A, 100B, 100C, 100D, 100E, 100F), closed space information computing devices (control devices) 100 (100A', 100C', 100D', 100E', 100F'), and antenna devices 10 (10A, 10C, 10D, 10E, 10F), etc., of the present disclosure are each realized by hardware as shown in Figure 25 or Figure 26.

[0131] The control devices (closed space information computing devices) 100 (100A, 100B, 100C, 100D, 100E, 100F), the closed space information computing devices (control devices) 100 (100A', 100C', 100D', 100E', 100F'), and the antenna devices 10 (10A, 10C, 10D, 10E, 10F), etc., are each composed of, for example, a processor 10001, a memory 10002, an input / output interface 10003, and a communication circuit 10004, as shown in Figure 25. The processor 10001 and memory 10002 are, for example, those installed in a computer. The memory 10002 contains the computer, a composite electromagnetic field calculation unit (composite electromagnetic field calculation device) 120, a composite electromagnetic field calculation device (composite electromagnetic field calculation unit) 120 (120'), an active reflection coefficient calculation unit (active reflection coefficient calculation device) 130, an active reflection coefficient calculation device (active reflection coefficient calculation unit) 130 (130'), an excitation coefficient evaluation unit (excitation coefficient evaluation device) 140, an excitation coefficient evaluation device (excitation coefficient evaluation unit) 140 (140'), a domain definition unit (domain definition device) 141, a domain definition device (domain definition unit) 141 (141'), an objective function calculation unit (objective function calculation device) 142, an objective function calculation device (objective function calculation unit) 142 (14 2'), a program for causing the objective function evaluation unit (objective function evaluation device) 143, objective function evaluation device (objective function evaluation unit) 143 (143'), domain definition unit (domain definition device) 150, domain definition device (domain definition unit) 150 (150'), element usage determination unit (element usage determination device) 160, element usage determination device (element usage determination unit) 160 (160'), load identification unit (load identification device) 170, load identification device (load identification unit) 170 (170'), electromagnetic field simulation unit (electromagnetic field simulator) 180, timing unit (timer) 500, timer (timing unit) 500 (500'), and a control unit (not shown) to function is stored.The processor 10001 reads and executes the program stored in memory 10002, thereby enabling the combined electromagnetic field calculation unit (combined electromagnetic field calculation device) 120, the combined electromagnetic field calculation device (combined electromagnetic field calculation unit) 120 (120'), the active reflection coefficient calculation unit (active reflection coefficient calculation device) 130, the active reflection coefficient calculation device (active reflection coefficient calculation unit) 130 (130'), the excitation coefficient evaluation unit (excitation coefficient evaluation device) 140, the excitation coefficient evaluation device (excitation coefficient evaluation unit) 140 (140'), the domain definition unit (domain definition device) 141, the domain definition device (domain definition unit) 141 (141'), the objective function calculation unit (objective function calculation device) 142, and the objective function calculation device (objective function calculation unit) 142 (142'). The functions of the objective function evaluation unit (objective function evaluation device) 143, objective function evaluation device (objective function evaluation unit) 143 (143'), domain definition unit (domain definition device) 150, domain definition device (domain definition unit) 150 (150'), element usage determination unit (element usage determination device) 160, element usage determination device (element usage determination unit) 160 (160'), load identification unit (load identification device) 170, load identification device (load identification unit) 170 (170'), electromagnetic field simulation unit (electromagnetic field simulator) 180, timing unit (timer) 500, timer (timer) 500 (500'), and a control unit (not shown) are realized. In addition, a memory 10002 or other memory (not shown) realizes a storage unit (memory device) 110, a storage unit (memory device) 110 (110'), and a storage unit (not shown). In addition, a communication circuit 10004 realizes a communication unit (not shown).

[0132] The processor 10001 uses, for example, a CPU (Central Processing Unit), a GPU (Graphics Processing Unit), a microprocessor, a microcontroller, or a DSP (Digital Signal Processor). The memory 10002 may be a non-volatile or volatile semiconductor memory such as RAM (Random Access Memory), ROM (Read Only Memory), EPROM (Erasable Programmable ROM), EEPROM (Electrically Erasable Programmable Read Only Memory), or flash memory; it may be a magnetic disk such as a hard disk or flexible disk; it may be an optical disk such as a CD (Compact Disc) or DVD (Digital Versatile Disc); or it may be a magneto-optical disk. The processor 10001 and the memory 10002 or the communication circuit 10004 are connected in a manner that enables them to transmit data to each other. Furthermore, the processor 10001, the memory 10002, and the communication circuit 10004 are connected in a manner that allows them to mutually transmit data with other hardware via the input / output interface 10003.

[0133] Alternatively, in the control device (closed space information calculation device) 100 (100A, 100B, 100C, 100D, 100E, 100F), the closed space information calculation device (control device) 100 (100A', 100C', 100D', 100E', 100F'), and the antenna device 10 (10A, 10C, 10D, 10E, 10F), etc., the composite electromagnetic field calculation unit (composite electromagnetic field calculation device) 120, the composite electromagnetic field calculation device (composite electromagnetic field calculation unit) 120 (120'), the active reflection coefficient calculation unit (active reflection coefficient calculation device) 130, the active reflection coefficient calculation device (active reflection coefficient calculation unit) 130 (130'), the excitation coefficient evaluation unit (excitation coefficient evaluation device) 140, the excitation coefficient evaluation device (excitation coefficient evaluation unit) 140 (140'), and the domain definition. Unit (domain definition device) 141, domain definition device (domain definition unit) 141 (141'), objective function calculation unit (objective function calculation device) 142, objective function calculation device (objective function calculation unit) 142 (142'), objective function evaluation unit (objective function evaluation device) 143, objective function evaluation device (objective function evaluation unit) 143 (143'), domain definition unit (domain definition device) 150, domain definition device (domain definition unit) 150 (150'), element usage determination unit (element usage determination device) 160, element usage determination device (element usage determination unit) 160 (160'), load identification unit (load identification device) 170, load identification device (load identification unit) 170 (170'), electromagnetic field simulation unit (electromagnetic field simulator) 180, timing unit (timer) 500, timer (timing unit) 500 (500'), Furthermore, the functions of the control unit, which are not shown, may be realized by a dedicated processing circuit 20001, as shown in Figure 26.

[0134] The processing circuit 20001 may be a single circuit, a composite circuit, a programmed processor, a parallel programmed processor, an ASIC (Application Specific Integrated Circuit), a PLD (Programmable Logic Device), an FPGA (Field-Programmable Gate Array), a SoC (System-on-a-Chip), or a system LSI (Large-Scale Integration). Furthermore, a memory 20002 or other memory (not shown) is used to realize a storage unit (memory device) 110, a storage unit (memory device) 110 (110'), and another storage unit (not shown). The memory 20002 may be a non-volatile or volatile semiconductor memory such as RAM (Random Access Memory), ROM (Read Only Memory), EPROM (Erasable Programmable ROM), EEPROM (Electrically Erasable Programmable Read Only Memory), or flash memory; it may be a magnetic disk such as a hard disk or flexible disk; it may be an optical disk such as a CD (Compact Disc) or DVD (Digital Versatile Disc); or it may be a magneto-optical disk. Furthermore, a communication unit (not shown) is realized by the communication circuit 20004. The processing circuit 20001 and the memory 20002 or the communication circuit 20004 are connected in a manner that allows them to transmit data to each other. Furthermore, the processing circuit 20001, the memory 20002, and the communication circuit 20004 are connected in a manner that allows them to transmit data to each other with other hardware via the input / output interface 20003.Furthermore, the combined electromagnetic field calculation unit (combined electromagnetic field calculation device) 120 in the control device (closed space information calculation device) 100 (100A, 100B, 100C, 100D, 100E, 100F), the closed space information calculation device (control device) 100 (100A', 100C', 100D', 100E', 100F'), and the antenna device 10 (10A, 10C, 10D, 10E, 10F), etc., and the combined electromagnetic field Calculation device (composite electromagnetic field calculation unit) 120 (120'), active reflection coefficient calculation unit (active reflection coefficient calculation device) 130, active reflection coefficient calculation device (active reflection coefficient calculation unit) 130 (130'), excitation coefficient evaluation unit (excitation coefficient evaluation device) 140, excitation coefficient evaluation device (excitation coefficient evaluation unit) 140 (140'), domain definition unit (domain definition device) 141, domain definition device (domain definition unit) 1 The functions of 41 (141'), objective function calculation unit (objective function calculation device) 142, objective function calculation device (objective function calculation unit) 142 (142'), objective function evaluation unit (objective function evaluation device) 143, objective function evaluation device (objective function evaluation unit) 143 (143'), domain definition unit (domain definition device) 150, domain definition device (domain definition unit) 150 (150'), element usage determination unit (element usage determination device) 160, element usage determination device (element usage determination unit) 160 (160'), load identification unit (load identification device) 170, load identification device (load identification unit) 170 (170'), electromagnetic field simulation unit (electromagnetic field simulator) 180, timing unit (timer) 500, timer (timer) 500 (500'), and the control unit (not shown) may be implemented by separate processing circuits or by a single processing circuit.

[0135] Alternatively, in the control device (closed space information calculation device) 100 (100A, 100B, 100C, 100D, 100E, 100F), the closed space information calculation device (control device) 100 (100A', 100C', 100D', 100E', 100F'), and the antenna device 10 (10A, 10C, 10D, 10E, 10F), etc., the combined electromagnetic field calculation unit (combined electromagnetic field calculation device) 120, the combined electromagnetic field calculation device (combined electromagnetic field calculation device) Magnetic field calculation unit) 120 (120'), active reflection coefficient calculation unit (active reflection coefficient calculation device) 130, active reflection coefficient calculation device (active reflection coefficient calculation unit) 130 (130'), excitation coefficient evaluation unit (excitation coefficient evaluation device) 140, excitation coefficient evaluation device (excitation coefficient evaluation unit) 140 (140'), domain definition unit (domain definition device) 141, domain definition device (domain definition unit) 141 (141'), objective function calculation unit ( Some functions of the objective function calculation unit (objective function calculation section) 142 (142'), objective function evaluation unit (objective function evaluation unit) 143 (143'), domain definition unit (domain definition unit) 150, domain definition unit (domain definition unit) 150 (150'), element usage determination unit (element usage determination unit) 160, element usage determination unit (element usage determination unit) 160 (160'), load identification unit (load identification unit) 170, load identification unit (load identification unit) 170 (170'), electromagnetic field simulation unit (electromagnetic field simulator) 180, timing unit (timer) 500, timer (timing unit) 500 (500'), and control unit (not shown) may be implemented by the processor 10001 and memory 10002, while the remaining functions are implemented by the processing circuit 20001.

[0136] Within the scope of this disclosure, it is possible to freely combine the embodiments, modify any component of each embodiment, or omit any component of each embodiment.

[0137] This disclosure is suitable for use in control devices or antenna devices that irradiate loads placed inside a closed space with electromagnetic waves using an array antenna, as it allows for a balanced control of the desired composite electromagnetic field and the reduction of the active reflection coefficient when irradiating loads placed inside a closed space with electromagnetic waves using an array antenna.

[0138] 10 (10A, 10C, 10D, 10E, 10F) Antenna device, 100 (100A, 100B, 100C, 100D, 100E, 100F) Control device (closed space information calculation device), 100 (100A', 100B', 100C', 100D', 100E', 100F') Closed space information calculation device (control device), 110 Storage unit (memory device), 110 (110') Memory device (storage unit), 120 Composite electromagnetic field calculation unit (composite electromagnetic field calculation device), 120 (120') Composite electromagnetic field calculation device (composite electromagnetic field calculation unit), 130 Active reflection coefficient calculation unit (active reflection coefficient calculation device), 130 (130') Active reflection coefficient calculation device (active reflection coefficient calculation unit), 140 Excitation coefficient evaluation unit (excitation coefficient evaluation device), 140 (140') Excitation coefficient evaluation device (excitation coefficient evaluation unit), 141 Domain definition unit (domain definition device), 141 (141') Domain definition device (domain definition unit), 142 Objective function calculation unit (objective function calculation device), 142 (142') Objective function calculation device (objective function calculation unit), 143 Objective function evaluation unit (objective function evaluation device), 143 (143') Objective function evaluation device (objective function evaluation unit), 150 Domain definition unit (domain definition device), 150 (150') Domain definition device (domain definition unit), 160 Element usage determination unit (element usage determination device), 160 (160') Element usage determination device (element usage determination unit), 170 Load identification unit (load identification device), 170 (170') Load identification device (load identification unit), 180 Electromagnetic field simulation unit (electromagnetic field simulator), 200 Array antenna, 210 Amplifier, 220 Phase shifter, 230 Element antenna, 230 (230') Microstrip antenna (element antenna), 231 Group of elements used, 232 Group of elements not used, 300 Closed space, 310 Concentration area, 320 Expansion area, 330 Maximization area, 340 Minimization area, 350 Irradiation area, 400 Load identification sensor, 500 Timing unit (timer), 500 (500') Timer (timing unit), 1000 Load (water), 10001 Processor, 10002 Memory, 10003 Input / output interface, 10004 Communication circuit, 20001 Processing circuit, 20002 Memory, 20003 Input / output interface, 20004 Communication circuit.

Claims

1. A control device for controlling an array antenna that irradiates an electromagnetic wave onto a load placed inside a closed space, comprising: a composite electromagnetic field calculation unit that calculates a radiated electromagnetic field value at the load by referring to pre-stored element electromagnetic field information, which is information showing the distribution of element electromagnetic fields generated when each element antenna constituting the array antenna is excited, and using the element electromagnetic field information and candidate excitation coefficients consisting of input amplitude and input phase for each element antenna; an active reflection coefficient calculation unit that calculates an active reflection coefficient at each element antenna by referring to pre-stored complex reflection coefficient information, which is information on the complex reflection coefficient at each element antenna generated by the excitation, and using the complex reflection coefficient information and candidate excitation coefficients; and an excitation coefficient evaluation unit that determines an excitation coefficient such that the ratio of power consumption between a region including a part of the load and a region other than that region is less than or equal to the first target value and the active reflection coefficient is less than or equal to the second target value, using the radiated electromagnetic field value, the active reflection coefficient, a first target value, a second target value, an excitation coefficient, the radiated electromagnetic field value, and the active reflection coefficient as an objective function, A control device equipped with the following features.

2. A control device according to claim 1, wherein the objective function is a function that includes: a first evaluation function with the first target value and the excitation coefficient as variables; a second evaluation function with the second target value and the excitation coefficient as variables; weights that determine the balance between the first evaluation function and the second evaluation function; a radiated electromagnetic field value; and an active reflection coefficient.

3. A control device according to claim 2, further comprising a region definition unit that defines a maximization region including a region in which power is concentrated within the closed space, a minimization region which is a region other than the maximization region, and power evaluation points in each of the regions, based on region information received and stored in advance, wherein the first evaluation function consists of a plurality of statistical values ​​using the power values ​​of the power evaluation points in each of the minimization region and the maximization region when the excitation coefficient given to the excitation coefficient evaluation unit is used, and the first target value, and the second evaluation function consists of statistical values ​​of the active reflection coefficient of each element antenna when the excitation coefficient given to the excitation coefficient evaluation unit is used, and the second target value, characterized in that 4. A control device according to claim 2, further comprising a region definition unit that defines, based on region information received and stored in advance, a minimization region which is a region in which power is minimized within the closed space; a concentration region which is a region in which power is concentrated; an expansion region which is a region between the concentration region and the minimization region; a maximization region which is a region formed by combining the concentration region and the expansion region and in which power is maximized within the closed space; and power evaluation points in each of the said regions, wherein the first evaluation function consists of a plurality of statistical values ​​using the power values ​​of the power evaluation points in each of the regions, the minimization region, and the maximization region, when using the excitation coefficient given to the excitation coefficient evaluation unit, and the first target value, and the second evaluation function consists of statistical values ​​of the active reflection coefficient of each element antenna, when using the excitation coefficient given to the excitation coefficient evaluation unit, and the second target value, characterized in that 5. A control device according to any one of claims 1 to 4, further comprising a storage unit that pre-stores the element electromagnetic field information and the complex reflection coefficient information.

6. A control device according to any one of claims 1 to 5, further comprising a unit for determining the element to be used, wherein the unit for determining the element to be used extracts a group of elements to be used from the array antenna, including one or more element antennas, such that the maximum gain in the power irradiation region, which is a region that has been received and stored in advance, is equal to or greater than a gain target value that has been stored in advance, and the unit for evaluating the excitation coefficient calculates the excitation coefficient of one or more element antennas included in the group of elements to be used.

7. A control device according to any one of claims 1 to 5, further comprising a load identification unit, wherein the load identification unit identifies a load based on one or more of the position, shape, temperature, or reflected power of the load, which are measurement results of a load identification sensor that measures the load in the closed space, and outputs load information indicating the said load, and the element electromagnetic field information read out by the composite electromagnetic field calculation unit is element electromagnetic field information corresponding to the load indicated in the load information from among the element electromagnetic field information stored in advance.

8. A control device according to claim 7, wherein the load identification unit identifies a load at intervals measured by a timer and outputs load information indicating the said load.

9. A control device according to claim 7 or claim 8, further comprising an electromagnetic field simulator, wherein the electromagnetic field simulator calculates the element electromagnetic field using the load information output by the load identification unit, and stores the element electromagnetic field information in the storage unit based on the calculation result.

10. A plurality of element antennas constituting an array antenna that irradiates an electromagnetic wave onto a load placed inside a closed space, each of the element antennas being connected to an amplifier and a phase shifter; a composite electromagnetic field calculation unit that calculates the radiated electromagnetic field value at the load by referring to pre-stored element electromagnetic field information which is information showing the distribution of element electromagnetic fields generated when each element antenna constituting the array antenna is excited, and using the element electromagnetic field information and candidate excitation coefficients consisting of input amplitude and input phase for each element antenna; an active reflection coefficient calculation unit that calculates the active reflection coefficient at each element antenna by referring to pre-stored complex reflection coefficient information which is information on the complex reflection coefficient at each element antenna generated by the excitation, and using the complex reflection coefficient information and candidate excitation coefficients; An antenna device comprising: an excitation coefficient evaluation unit that uses the radiated electromagnetic field value, the active reflection coefficient, and an objective function including a first target value, a second target value, an excitation coefficient, the radiated electromagnetic field value, and the active reflection coefficient to determine an excitation coefficient such that the ratio of power consumption between a region including a part of the load and a region other than that region is less than or equal to the first target value and the active reflection coefficient is less than or equal to the second target value, and outputs the excitation coefficient to the amplifier and phase shifter of the element antenna.

11. A control method by a control device for controlling an array antenna that irradiates an electromagnetic wave onto a load placed inside a closed space, wherein the control device refers to pre-stored element electromagnetic field information, which is information indicating the distribution of element electromagnetic fields generated when each element antenna constituting the array antenna is excited, and calculates the radiated electromagnetic field value at the load using the element electromagnetic field information and candidate excitation coefficients consisting of input amplitude and input phase for each element antenna; the control device refers to pre-stored complex reflection coefficient information, which is information on the complex reflection coefficient at each element antenna generated by the excitation, and calculates the active reflection coefficient at each element antenna using the complex reflection coefficient information and candidate excitation coefficients; and the control device determines an excitation coefficient such that the ratio of power consumption between a region including a part of the load and a region other than that region is less than or equal to the first target value and the active reflection coefficient is less than or equal to the second target value, using the radiated electromagnetic field value, the active reflection coefficient, and an objective function including a first target value, a second target value, an excitation coefficient, the radiated electromagnetic field value, and the active reflection coefficient. A control method characterized by the following:

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