Method for designing broadband antenna, computing device for performing same, and broadband antenna designed thereby

Abstract

Disclosed are a method for designing a broadband antenna, a computing device for performing same, and a broadband antenna designed thereby. A method for designing a broadband antenna according to a disclosed embodiment comprises designing a broadband antenna including one or more radiators formed by a first curve and a second curve, wherein the first curve is determined by a first slope parameter involved in a slope at a start point of the first curve and a second slope parameter involved in a slope at an end point of the first curve, and the second curve is determined based on a third slope parameter involved in a slope at a start point of the second curve and a fourth slope parameter involved in a slope at an end point of the second curve. The method comprises: a step of determining the shape of the radiator including the first curve and the second curve in a state in which a value of any one of the first slope parameter to the fourth slope parameter is selected; and a step of determining an optimal value of a corresponding slope parameter in a preset range by evaluating radiation performance of the broadband antenna in which the shape of the radiator is determined.

Description

Design method of a wideband antenna and a computing device for performing the same and a wideband antenna designed thereby

[0001] An embodiment of the present invention relates to a design technique for a wideband antenna.

[0002] Impulse-like signals (i.e., impulse-like signals) are waveforms with a pulse width of several picoseconds in the time domain, and the corresponding pulse spectrum has a bandwidth of several gigahertz. These impulse-like signals are primarily used as antenna input signals in short-range impulse radar applications.

[0003] Here, short-range impulse radars, based on impulse-like signals transmitted from an antenna, receive pulses reflected from objects within a detection range of 50 cm to 5 m, and then undergo a series of signal processing processes to obtain additional information, such as object location information or high-resolution images. Thus, in applications such as imaging and location information of short-range objects, resolution, the ability to distinguish between two objects, is crucial, and this is closely related to the antenna bandwidth. The wider the antenna bandwidth, the better the resolution.

[0004] Meanwhile, near-range impulse radars utilize penetrating radars, such as Ground-Penetrating Radar (GPR) or Through-The-Wall Radar (TWR). The antenna's operating frequency must be in a low-frequency band to facilitate object penetration. However, the physical size of the antenna is limited, requiring a method that allows the antenna to operate in a low-frequency band while maintaining a wide frequency band within a limited antenna size.

[0005] In addition, the signal input to the antenna in the penetrating radar is mainly a first-order differentiated Gaussian pulse, and when this input signal is radiated through the antenna, it must have little dispersion and little distortion. Therefore, when designing the antenna, it is necessary to design it so as to well reflect the characteristics of this input signal.

[0006] An embodiment of the present invention provides a design method of a new technique for a wideband antenna, a computing device for performing the same, and a wideband antenna designed thereby.

[0007] A design method of a wideband antenna according to one embodiment of the present disclosure is a design method of a wideband antenna including at least one radiator formed of a first curve having a first exponential function shape and a second curve having a second exponential function shape based on a feed point provided on a substrate, wherein the first curve is determined by a first slope parameter involved in a slope at a starting point of the first curve and a second slope parameter involved in a slope at an ending point of the first curve, and the second curve is determined based on a third slope parameter involved in a slope at a starting point of the second curve and a fourth slope parameter involved in a slope at an ending point of the second curve, the method comprising: selecting a value of one slope parameter among the first slope parameter and the fourth slope parameter from a preset range and fixing the remaining slope parameters to preset values, thereby determining a shape of the radiator formed of the first curve and the second curve; and evaluating a radiation performance of the wideband antenna in which the shape of the radiator is determined to determine an optimal value of the corresponding slope parameter from among the preset ranges.

[0008] The step of evaluating the radiation performance of the wideband antenna may include: a step of calculating a time-domain reflection pulse of the wideband antenna, in which the shape of the radiator is determined; a step of calculating a first evaluation factor value and a second evaluation factor value for evaluating the performance of the wideband antenna based on the time-domain reflection pulse; a step of calculating a time-domain radiation pulse of the wideband antenna, in which the shape of the radiator is determined; and a step of calculating a third evaluation factor value and a fourth evaluation factor value for evaluating the performance of the wideband antenna based on the time-domain radiation pulse.

[0009] The reflected pulse in the above time domain is calculated based on the reflection coefficient of the wideband antenna and the input signal of the wideband antenna, and the input signal may be a first-order differentiated Gaussian pulse.

[0010] The first evaluation factor may be a peak-to-peak value of a signal reflected from a feeding point of the wideband antenna among the reflected pulses, and the second evaluation factor may be a peak-to-peak value of a signal reflected from an end of a radiator of the wideband antenna among the reflected pulses.

[0011] The third evaluation factor may be a peak-to-peak value of a main pulse among the radiation pulses, and the fourth evaluation factor may be a peak-to-peak value of a signal reflected from the radiator and then re-radiated into the air among the radiation pulses.

[0012] The step of evaluating the radiation performance of the wideband antenna may evaluate the radiation performance of the wideband antenna based on the first evaluation factor, the second evaluation factor, the third evaluation factor, and the fourth evaluation factor.

[0013] The step of evaluating the radiation performance of the broadband antenna includes the step of setting an evaluation index based on the first evaluation factor, the second evaluation factor, the third evaluation factor, and the fourth evaluation factor, and the step of determining the value of the optimal corresponding slope parameter may determine the value of the corresponding slope parameter at which the value of the evaluation index is the largest as the value of the optimal corresponding slope parameter.

[0014] The above evaluation index may be set to decrease in proportion to the values ​​of the first evaluation factor, the second evaluation factor, and the fourth evaluation factor, and to increase in proportion to the value of the third evaluation factor.

[0015] The above evaluation indicators can be set by the mathematical formula below.

[0016] (mathematical formula)

[0017] Evaluation Criteria =

[0018] : Value of the first evaluation factor

[0019] : Value of the second evaluation factor

[0020] : Value of the third evaluation factor

[0021] : Value of the 4th evaluation factor

[0022] A computing device according to one embodiment of the disclosure comprises: one or more processors; memory; And a computing device for designing a wideband antenna including one or more radiators, the one or more programs including the one or more programs being stored in the memory and configured to be executed by the one or more processors, the computing device for designing a wideband antenna including one or more radiators, the first curve having a first exponential function shape and the second curve having a second exponential function shape based on a feed point provided on a substrate, the first curve being determined by a first slope parameter involved in a slope at a starting point of the first curve and a second slope parameter involved in a slope at an ending point of the first curve, the second curve being determined based on a third slope parameter involved in a slope at a starting point of the second curve and a fourth slope parameter involved in a slope at an ending point of the second curve, the one or more programs comprising instructions for determining a shape of the radiator formed of the first curve and the second curve by selecting a value of one of the first slope parameter to the fourth slope parameter from a preset range and fixing the remaining slope parameters to preset values; And includes a command for evaluating the radiation performance of a wideband antenna whose shape of the radiator is determined and determining the value of the optimal corresponding slope parameter among the preset ranges.

[0023] According to the disclosed embodiment, a wideband antenna can be designed by well reflecting the characteristics of an input signal of the wideband antenna in the time domain, thereby optimizing the radiation performance of the wideband antenna.

[0024] FIG. 1 is a drawing showing a wideband antenna according to one embodiment of the present invention.

[0025] Figure 2 is a graph comparing antenna characteristics when the closed surface shape of the radiator is changed by changing the slope parameter in one embodiment of the present invention.

[0026] FIG. 3 is a block diagram illustrating a computing environment including a computing device suitable for use in exemplary embodiments.

[0027] Figure 4 is a flowchart showing a design method of a wideband antenna according to one embodiment of the present invention.

[0028] FIG. 5 is a graph showing a reflected pulse in the time domain of a wideband antenna in one embodiment of the present invention.

[0029] FIG. 6 is a graph showing a time-domain radiation pulse of a wideband antenna in one embodiment of the present invention.

[0030] FIG. 7 is a diagram showing each evaluation factor and evaluation index (EF) of a wideband antenna according to a change in the value of the first slope parameter (n1) in one embodiment of the present invention.

[0031] FIG. 8 is a diagram showing a wideband antenna shape when the first slope parameter (n1) to the fourth slope parameter (n4) are at optimal values ​​in one embodiment of the present invention.

[0032] Hereinafter, specific embodiments of the present invention will be described with reference to the drawings. The following detailed description is provided to facilitate a comprehensive understanding of the methods, devices, and / or systems described herein. However, these are merely examples and the present invention is not limited thereto.

[0033] In describing embodiments of the present invention, if a detailed description of a known technology related to the present invention is judged to unnecessarily obscure the gist of the present invention, the detailed description will be omitted. In addition, the terms described below are terms defined in consideration of their functions in the present invention, and this may vary depending on the intention or custom of the user or operator. Therefore, the definitions should be made based on the contents throughout this specification. The terminology used in the detailed description is only for the purpose of describing embodiments of the present invention and should not be limited in any way. Unless clearly used otherwise, the singular form includes the plural form. In this description, expressions such as "comprises" or "having" are intended to indicate certain features, numbers, steps, operations, elements, parts or combinations thereof, and should not be construed to exclude the presence or possibility of one or more other features, numbers, steps, operations, elements, parts or combinations thereof other than those described.

[0034] Meanwhile, directional terms such as upper, lower, one side, and the other side are used in reference to the orientation of the disclosed drawings. Since components of embodiments of the present invention can be positioned in various orientations, directional terms are used for illustrative purposes and are not intended to be limiting.

[0035] Additionally, while terms such as "first" and "second" may be used to describe various components, these components should not be limited by these terms. These terms may be used to distinguish one component from another. For example, without departing from the scope of the present invention, a first component may be referred to as a "second component," and similarly, a second component may also be referred to as a "first component."

[0036] FIG. 1 is a drawing showing a wideband antenna according to one embodiment of the present invention.

[0037] Referring to FIG. 1, a wideband antenna (100) may include a substrate (102), a feed line (104), and a radiator (106). In one embodiment, the wideband antenna (100) may be used in a penetrating radar such as a ground-penetrating radar (GPR) or a through-the-wall radar (TWR), but is not limited thereto, and may be used in various other fields such as a medical imaging radar (MIR).

[0038] The substrate (102) can support a wideband antenna (100). A printed circuit board having a preset dielectric constant can be used as the substrate (102). In one embodiment, the substrate (102) can be formed in a square shape, but the shape of the substrate (102) is not limited thereto.

[0039] A feeding line (104) may be provided on one side of the substrate (102). The feeding line (104) may be provided to connect a feeding point at one end of the substrate (102). In one embodiment, the feeding point (P) may be provided at the center of the substrate (102).

[0040] A radiator (106) may be provided on one surface of a substrate (102). The radiator (106) may be provided connected to the end of a power supply line (104) (i.e., a power supply point). The radiator (106) may receive power from the power supply line (104) and transmit and receive signals.

[0041] The radiator (106) may be arranged symmetrically left and right with respect to the center of the substrate (102). In one embodiment, the radiator (106) may be a Vivaldi antenna of an anti-podal type. The radiator (106) may include a closed surface formed by a first curve (S1) having a first exponential function shape and a second curve (S2) having a second exponential function shape based on a feeding point. At this time, the starting points of the first curve and the second curve are the same as the feeding point, and the end points of the first curve and the second curve are also the same. In FIG. 2, the end points of the first curve and the second curve are illustrated near the left and right corners of the upper end of the substrate (102), but are not limited thereto. Here, the first curve (S1) may form an upper curve of the closed surface forming the radiator (106), and the second curve (S2) may form a lower curve of the closed surface.

[0042] Meanwhile, the parameters involved in the slope components of the first curve (S1) and the second curve (S2) can be defined as follows. The first slope parameter (n1) is a parameter involved in the slope at the starting point of the first curve. The second slope parameter (n2) is a parameter involved in the slope at the ending point of the first curve. The third slope parameter (n3) is a parameter involved in the slope at the starting point of the second curve. The fourth slope parameter (n4) is a parameter involved in the slope at the ending point of the second curve.

[0043] And, the length of the radiator (106) in the horizontal direction (x-axis direction) based on the feeding point on the closed surface (P) of the radiator (106) is the horizontal length (x base ) is defined as the length of the radiator (106) in the vertical direction (y-axis direction) based on the power supply point, and the vertical length (y base ) can be defined as.

[0044] Then, when the horizontal direction is the x-axis and the vertical direction is the y-axis based on the power supply point (i.e., the power supply point is the origin), the first curve (S1) can be expressed by the following mathematical equation 1.

[0045] (Equation 1)

[0046]

[0047]

[0048] Here, is. The horizontal length (x) of the radiator (106) base ) and vertical length (y base ) is fixed, the first curve (S1) is determined by the first slope parameter (n1) and the second slope parameter (n2).

[0049] And, the second curve (S2) of the radiator (106) can be expressed by the following mathematical expression 2.

[0050] (Equation 2)

[0051]

[0052]

[0053] Here, is. The horizontal length (x) of the radiator (106) base ) and vertical length (y base ) is fixed, the second curve (S2) is determined by the third slope parameter (n3) and the fourth slope parameter (n4).

[0054] That is, the shape of the closed surface (P) of the radiator (106) can be determined by the first slope parameter (n1), the second slope parameter (n2), the third slope parameter (n3), and the fourth slope parameter (n4). In addition, the radiation characteristics of the wideband antenna (100) change depending on the shape of the closed surface of the radiator (106).

[0055] Here, the optimization value that optimizes the radiation characteristics of the wideband antenna (100) can be calculated for each of the first slope parameter (n1), the second slope parameter (n2), the third slope parameter (n3), and the fourth slope parameter (n4). For example, when calculating the optimization value for the first slope parameter (n1), the radiation characteristics of the wideband antenna (100) can be checked by changing the value of the first slope parameter (n1) while fixing the remaining slope parameters (i.e., n2 to n4) to preset values, thereby determining the value of the first slope parameter (n1) at which the radiation characteristics of the wideband antenna (100) are the best. In addition, the optimal values ​​can be determined for the second slope parameter (n2), the third slope parameter (n3), and the fourth slope parameter (n4) by changing the values ​​of the corresponding slope parameters while fixing the remaining slope parameters to preset values, thereby checking the radiation characteristics of the wideband antenna (100).

[0056] Fig. 2 is a graph comparing antenna characteristics when the closed-surface shape of the radiator is changed by changing the slope parameter in one embodiment of the present invention. Fig. 2 shows the reflection coefficient (Fig. 2 (a)) and input impedance (Fig. 2 (b)) when the closed-surface shape of the radiator is changed, such as Case 1, Case 2, and Case 3. Here, Case 1 and Case 2 are cases where the first curve (S1) is changed, and Case 2 and Case 3 are cases where the second curve (S2) is changed.

[0057] As shown in Fig. 2, by changing the slope parameters of the first curve (S1) and the second curve (S2) to change the closed surface shape of the radiator (106), it can be seen that the reflection coefficient and input impedance of the antenna (100) change. In Fig. 2, it can be seen that Case 3 has the best characteristics of the antenna (100).

[0058] FIG. 3 is a block diagram illustrating a computing environment (10) including a computing device suitable for use in exemplary embodiments. In the illustrated embodiment, each component may have different functions and capabilities other than those described below, and may include additional components other than those described below.

[0059] The illustrated computing environment (10) includes a computing device (12). In one embodiment, the computing device (12) may be a device for designing a wideband antenna. The computing device (12) may include a simulation for designing a wideband antenna. For example, the computing device (12) may perform antenna design simulation using HFSS (High Frequency Structure Simulator).

[0060] A computing device (12) includes at least one processor (14), a computer-readable storage medium (16), and a communication bus (18). The processor (14) may cause the computing device (12) to operate according to the exemplary embodiments mentioned above. For example, the processor (14) may execute one or more programs stored in the computer-readable storage medium (16). The one or more programs may include one or more computer-executable instructions, which, when executed by the processor (14), may be configured to cause the computing device (12) to perform operations according to the exemplary embodiments.

[0061] A computer-readable storage medium (16) is configured to store computer-executable instructions or program code, program data, and / or other suitable forms of information. A program (20) stored in the computer-readable storage medium (16) includes a set of instructions executable by the processor (14). In one embodiment, the computer-readable storage medium (16) may be a memory (volatile memory such as random access memory, non-volatile memory, or a suitable combination thereof), one or more magnetic disk storage devices, optical disk storage devices, flash memory devices, any other form of storage medium that can be accessed by the computing device (12) and store desired information, or a suitable combination thereof.

[0062] A communication bus (18) interconnects various other components of the computing device (12), including the processor (14) and computer-readable storage media (16).

[0063] The computing device (12) may also include one or more input / output interfaces (22) that provide interfaces for one or more input / output devices (24) and one or more network communication interfaces (26). The input / output interfaces (22) and the network communication interfaces (26) are connected to the communication bus (18). The input / output devices (24) may be connected to other components of the computing device (12) via the input / output interfaces (22). Exemplary input / output devices (24) may include input devices such as pointing devices (such as a mouse or a trackpad), a keyboard, a touch input device (such as a touchpad or a touchscreen), a voice or sound input device, various types of sensor devices and / or photographing devices, and / or output devices such as display devices, printers, speakers and / or network cards. The exemplary input / output devices (24) may be included within the computing device (12) as a component constituting the computing device (12), or may be connected to the computing device (12) as a separate device distinct from the computing device (12).

[0064] Figure 4 is a flowchart illustrating a method for designing a wideband antenna according to one embodiment of the present invention. While the illustrated flowchart depicts the method as divided into multiple steps, at least some of the steps may be performed in a different order, combined with other steps and performed together, omitted, divided into sub-steps, or performed with one or more additional steps not illustrated.

[0065] Referring to FIG. 4, the computing device (12) can determine the first curve (S1) and the second curve (S2) of the wideband antenna (100) by selecting the value of the first slope parameter (n1) from a preset range while fixing the second slope parameter (n2), the third slope parameter (n3), and the fourth slope parameter (n4) among the first slope parameter (n1), the second slope parameter (n2), the third slope parameter (n3), and the fourth slope parameter (n4) of the wideband antenna (100) to preset values ​​(S 101). At this time, the shape of the radiator (106) is determined due to the first curve (S1) and the second curve (S2).

[0066] Next, the computing device (12) can calculate the reflection pulse in the time domain of the wideband antenna (100) (S 103). That is, the computing device (12) can calculate the reflection pulse in the time domain for the wideband antenna (100) in which the first curve (S1) and the second curve (S2) are determined by the first slope parameter (n1) to the fourth slope parameter (n4). The computing device (12) can calculate the reflection pulse in the time domain of the wideband antenna (100) based on the reflection coefficient of the wideband antenna (100) and the input signal.

[0067] Specifically, the computing device (12) can calculate the reflection coefficient of the wideband antenna (100). In addition, the computing device (12) can Fourier transform the input signal (i.e., the first-order differentiated Gaussian pulse) of the wideband antenna (100). The computing device (12) can multiply the reflection coefficient of the wideband antenna (100) and the Fourier-transformed input signal and inversely Fourier transform it to calculate the time-domain reflection pulse of the wideband antenna (100). The computing device (12) can calculate the time-domain reflection pulse of the wideband antenna (100) through the following mathematical expression 3. ) can be produced.

[0068] (Equation 3)

[0069]

[0070] : Reflection coefficient of wideband antenna

[0071] : Input signal of wideband antenna

[0072] FT: Fourier transform

[0073] IFT: Inverse Fourier Transform

[0074] Next, the computing device (12) can calculate the first evaluation factor value and the second evaluation factor value for performance evaluation of the wideband antenna (100) from the time domain reflection pulse of the wideband antenna (100) (S 105).

[0075] Here, the first evaluation factor may be the peak-to-peak value of the reflected pulse at the feeding point of the wideband antenna (100) (i.e., the starting point where the first curve and the second curve meet). That is, the first evaluation factor may be the peak-to-peak value of the signal reflected at the feeding point of the wideband antenna (100). Peak-to-peak may mean the difference between the highest value and the lowest value in the signal waveform. In addition, the second evaluation factor may be the peak-to-peak value of the reflected pulse at the end of the radiator (106) of the wideband antenna (100) (i.e., the end point where the first curve and the second curve meet).

[0076] Fig. 5 is a graph showing a reflected pulse in the time domain of a wideband antenna (100) in one embodiment of the present invention. Fig. 5 shows the reflected pulse in the time domain for each of the cases where the radiator shape is Case 1, Case 2, and Case 3.

[0077] Referring to FIG. 5, the first evaluation factor is the peak-to-peak (V) of the reflected pulse at the feeding point of the wideband antenna (100). pp,port refl.) is. Here, since Fig. 5 is a reflection pulse in the time domain, the reflection pulse at the feeding point (reflection pulse near the point where the input signal is input) can be easily detected. In addition, the second evaluation factor is the peak-to-peak (V) of the reflection pulse at the end of the radiator (106) of the wideband antenna (100). pp,endrefl. ), it can be calculated by extracting the reflection pulse at a point in time when a certain amount of time has passed since the reflection pulse at the power supply.

[0078] Next, the computing device (12) can produce a time-domain radiation pulse of the wideband antenna (100) (S 107). The computing device (12) can produce a time-domain radiation pulse of the wideband antenna (100) based on the reflection coefficient of the wideband antenna (100), the input signal of the wideband antenna (100), and the electric field component (frequency domain) of the far field of the wideband antenna (100).

[0079] The computing device (12) is configured to generate a time-domain radiated pulse of the wideband antenna (100) using the following mathematical expression 4. ) can be produced.

[0080] (Equation 4)

[0081]

[0082] : Electric field components in the far field of a broadband antenna

[0083] Next, the computing device (12) can calculate the third evaluation factor value and the fourth evaluation factor value for performance evaluation of the wideband antenna (100) from the time domain radiation pulse of the wideband antenna (100) (S 109).

[0084] Here, the third evaluation factor may be the peak-to-peak value of the main pulse of the signal radiated from the wideband antenna (100). That is, the third evaluation factor may be the peak-to-peak value of the main pulse of the signal radiated when the wideband antenna (100) radiates the signal into the air. In addition, the fourth evaluation factor may be the peak-to-peak value of the signal (i.e., the ringing signal) reflected from the radiator (106) of the wideband antenna (100) and then re-radiated into the air.

[0085] Fig. 6 is a graph showing a time-domain radiation pulse of a wideband antenna (100) in one embodiment of the present invention. Fig. 6 shows the time-domain radiation pulse for each of the cases where the radiator shape is Case 1, Case 2, and Case 3.

[0086] Referring to FIG. 6, the third evaluation factor is the peak-to-peak value (V) of the main pulse of the signal radiated from the wideband antenna (100). pp,rad ) can be. Here, Fig. 6 is a time-domain radiation pulse, and the main pulse of the radiation signal has the largest signal size among the radiation pulses, so the main pulse of the radiation signal can be easily detected.

[0087] Additionally, the fourth evaluation factor is the peak-to-peak value (V) of the signal (i.e., ringing signal) that is reflected from the radiator (106) of the wideband antenna (100) and then re-radiated into the air. pp,re-rad ) may be. Here, the ringing signal is a signal that occurs after the main pulse of the radiation signal and forms a shaking pattern with a signal of a smaller size than the main pulse, so it can be easily detected.

[0088] Next, the computing device (12) is the first evaluation element (V pp,port refl. ), the second evaluation factor (V pp,endrefl ), the third evaluation factor (V pp,rad ), and the fourth evaluation factor (V pp,re-rad) can be used to evaluate the radiation performance of the wideband antenna (100) (S 111).

[0089] Here, the computing device (12) can evaluate the radiation performance of the wideband antenna (100) through a preset evaluation index. In one embodiment, the computing device (12) can evaluate the first evaluation factor (V pp,port refl. ), the second evaluation factor (V pp,endrefl ), and the fourth evaluation factor (V pp,re-rad ) indicates that the radiation performance of the wideband antenna (100) is better as the value of the third evaluation factor (V pp,rad ) can be set to indicate that the larger the value, the better the radiation performance of the wideband antenna (100). The computing device (12) can set the evaluation index (Evaluation Factor: EF) through the following mathematical expression 5.

[0090] (Equation 5)

[0091] Evaluation Criteria =

[0092] Through this process, the computing device (12) can evaluate the radiation performance of the wideband antenna (100) when the value of the first slope parameter (n1) is selected from a preset range while fixing the second slope parameter (n2), the third slope parameter (n3), and the fourth slope parameter (n4) to preset values.

[0093] Next, the computing device (12) can extract the value of the first slope parameter (n1) that best improves the radiation performance of the wideband antenna (100) as an optimal value by changing the value of the first slope parameter (n1) within a preset range while fixing the second slope parameter (n2), the third slope parameter (n3), and the fourth slope parameter (n4) to preset values ​​(S 113).

[0094] For example, the computing device (12) can evaluate the radiation performance of the wideband antenna (100) by changing the value of the first slope parameter (n1) (for example, changing from n1 = 2 to n1 = 6) while fixing the second slope parameter (n2) to the fourth slope parameter (n4) to preset values, and extract the value of the first slope parameter (n1) that best improves the radiation performance of the wideband antenna (100) as the optimal first slope parameter (n1) value.

[0095] FIG. 7 is a diagram showing each evaluation factor and evaluation index (EF) of a wideband antenna (100) according to changes in the first slope parameter (n1) value in one embodiment of the present invention. Here, the first slope parameter (n1) value was measured while changing from n1 = 2 to n1 = 6, and the remaining slope parameters used fixed values. As can be seen in FIG. 7, the case where n1 = 4 has the best evaluation index (EF) of 975.0522.

[0096] Meanwhile, the computing device (12) can extract the optimal second slope parameter (n2) to fourth slope parameter (n4) values ​​that best improve the radiation performance of the wideband antenna (100) in the same manner for the second slope parameter (n2) to fourth slope parameter (n4).

[0097] Fig. 8 is a diagram showing a wideband antenna shape when the first slope parameter (n1) to the fourth slope parameter (n4) are at optimal values ​​in one embodiment of the present invention. In Fig. 8, the first slope parameter (n1) is set to n1 = 4, the second slope parameter (n2) is set to n2 = 1, the third slope parameter (n3) is set to n3 = 1, and the fourth slope parameter (n4) is set to n4 = 9.

[0098] According to the disclosed embodiment, a wideband antenna can be designed by well reflecting the characteristics of an input signal of the wideband antenna in the time domain, thereby optimizing the radiation performance of the wideband antenna.

[0099] While representative embodiments of the present invention have been described in detail above, those skilled in the art will appreciate that various modifications to the above-described embodiments are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the claims set forth below but also by equivalents thereof.

Claims

A design method for a wideband antenna including at least one radiator having a first curve having a first exponential function shape and a second curve having a second exponential function shape based on a feed point provided on a substrate, The first curve is determined by a first slope parameter involved in the slope at the starting point of the first curve and a second slope parameter involved in the slope at the ending point of the first curve, The second curve is determined based on a third slope parameter involved in the slope at the starting point of the second curve and a fourth slope parameter involved in the slope at the ending point of the second curve, A step of determining the shape of the radiator composed of the first curve and the second curve while selecting the value of one of the first to fourth slope parameters from a preset range and fixing the remaining slope parameters to preset values; and A design method for a wideband antenna, comprising a step of evaluating the radiation performance of a wideband antenna having a determined shape of the radiator and determining an optimal value of a corresponding slope parameter within the preset range. In claim 1, The step of evaluating the radiation performance of the above broadband antenna is: A step of generating a time-domain reflection pulse of a broadband antenna whose shape of the above-mentioned radiator is determined; A step of calculating a first evaluation factor value and a second evaluation factor value for evaluating the performance of the wideband antenna based on the reflection pulse in the time domain; A step of generating a time-domain radiation pulse of a broadband antenna whose shape of the above-mentioned radiator is determined; and A design method for a wideband antenna, comprising a step of calculating third evaluation factor values ​​and fourth evaluation factor values ​​for evaluating the performance of the wideband antenna based on the radiation pulse in the time domain. In claim 2, The reflected pulse in the above time domain is, Calculated based on the reflection coefficient of the above wideband antenna and the input signal of the above wideband antenna, A design method for a wideband antenna, wherein the above input signal is a first-order differentiated Gaussian pulse. In claim 2, The first evaluation factor is the peak-to-peak value of the signal reflected from the feeding point of the wideband antenna among the reflected pulses, A design method for a wideband antenna, wherein the second evaluation factor is a peak-to-peak value of a signal reflected from the end of the radiator of the wideband antenna among the reflected pulses. In claim 4, The third evaluation factor is the peak-to-peak value of the main pulse among the copy pulses, A design method for a wideband antenna, wherein the fourth evaluation factor is a peak-to-peak value of a signal that is reflected from the radiator and then re-radiated into the air among the radiation pulses. In claim 5, The step of evaluating the radiation performance of the above broadband antenna is: A design method for a wideband antenna, which evaluates the radiation performance of the wideband antenna based on the first evaluation factor, the second evaluation factor, the third evaluation factor, and the fourth evaluation factor. In claim 6, The step of evaluating the radiation performance of the above broadband antenna is: A step of setting an evaluation index based on the first evaluation factor, the second evaluation factor, the third evaluation factor, and the fourth evaluation factor, The step of determining the value of the optimal corresponding slope parameter is: A design method for a wideband antenna, wherein the value of the corresponding slope parameter having the largest value of the above evaluation index is determined as the optimal value of the corresponding slope parameter. In claim 7, The above evaluation indicators are, A design method for a wideband antenna, wherein the values ​​of the first evaluation factor, the second evaluation factor, and the fourth evaluation factor are set to decrease in proportion to the values ​​of the first evaluation factor, the second evaluation factor, and the fourth evaluation factor, and the values ​​of the third evaluation factor are set to increase in proportion to the values ​​of the third evaluation factor. In claim 8, The above evaluation index is a design method of a wideband antenna, which is set by the mathematical formula below. (mathematical formula) Evaluation Criteria = : Value of the first evaluation factor : Value of the second evaluation factor : Value of the third evaluation factor : Value of the 4th evaluation factor One or more processors; memory; and Contains one or more programs, The one or more programs are stored in the memory and configured to be executed by the one or more processors, A computing device for designing a wideband antenna including one or more radiators, each of which comprises a first curve having a first exponential shape and a second curve having a second exponential shape based on a feed point provided on a substrate. The first curve is determined by a first slope parameter involved in the slope at the starting point of the first curve and a second slope parameter involved in the slope at the ending point of the first curve, The second curve is determined based on a third slope parameter involved in the slope at the starting point of the second curve and a fourth slope parameter involved in the slope at the ending point of the second curve, One or more of the above programs, A command for determining the shape of the radiator composed of the first curve and the second curve while selecting the value of one of the first to fourth slope parameters from a preset range and fixing the remaining slope parameters to preset values; and A computing device comprising a command for evaluating the radiation performance of a broadband antenna having a determined shape of the radiator and determining an optimal value of the corresponding slope parameter among the preset ranges. In claim 10, The command to evaluate the radiation performance of the above broadband antenna is: A command for producing a time-domain reflection pulse of a broadband antenna having a determined shape of the above-mentioned radiator; A command for calculating a first evaluation factor value and a second evaluation factor value for evaluating the performance of the wideband antenna based on the reflected pulse in the time domain; A command for producing a time-domain radiation pulse of a broadband antenna having a determined shape of the above-mentioned radiator; and A computing device comprising a command for calculating a third evaluation factor value and a fourth evaluation factor value for evaluating the performance of the wideband antenna based on the radiation pulse in the time domain. In claim 11, The first evaluation factor is the peak-to-peak value of the signal reflected from the feeding point of the wideband antenna among the reflected pulses, A computing device wherein the second evaluation factor is a peak-to-peak value of a signal reflected from the end of the radiator of the broadband antenna among the reflected pulses. In claim 12, The third evaluation factor is the peak-to-peak value of the main pulse among the copy pulses, A computing device wherein the fourth evaluation factor is a peak-to-peak value of a signal that is reflected from the radiator and then re-radiated into the air among the radiation pulses. In claim 13, The command to evaluate the radiation performance of the above broadband antenna is: A computing device that evaluates the radiation performance of the wideband antenna based on the first evaluation factor, the second evaluation factor, the third evaluation factor, and the fourth evaluation factor. In claim 14, The command to evaluate the radiation performance of the above broadband antenna is: Includes a command for setting an evaluation index based on the first evaluation factor, the second evaluation factor, the third evaluation factor, and the fourth evaluation factor, The command to determine the value of the optimal corresponding slope parameter is: A computing device that determines the value of the corresponding slope parameter having the largest value of the above evaluation index as the optimal value of the corresponding slope parameter. In claim 15, The above evaluation indicators are, A computing device, wherein the value of the first evaluation factor, the second evaluation factor, and the fourth evaluation factor is set to decrease in proportion to the value of the third evaluation factor, and the value of the third evaluation factor is set to increase in proportion to the value of the third evaluation factor. A broadband antenna comprising at least one radiator having a first curve having a first exponential function shape and a second curve having a second exponential function shape based on a feed point provided on a substrate, A broadband antenna designed by the design method of a broadband antenna described in claim 1. A computer program stored in a non-transitory computer readable storage medium, To design a wideband antenna including one or more radiators having a first curve having a first exponential function shape and a second curve having a second exponential function shape based on a feed point provided on a substrate, The first curve is determined by a first slope parameter involved in the slope at the starting point of the first curve and a second slope parameter involved in the slope at the ending point of the first curve, The second curve is determined based on a third slope parameter involved in the slope at the starting point of the second curve and a fourth slope parameter involved in the slope at the ending point of the second curve, The computer program includes one or more instructions, which, when executed by a computing device having one or more processors, cause the computing device to: A step of determining the shape of the radiator composed of the first curve and the second curve while selecting the value of one of the first to fourth slope parameters from a preset range and fixing the remaining slope parameters to preset values; and A computer program that performs a step of evaluating the radiation performance of a broadband antenna whose shape of the above-mentioned radiator has been determined and determining the value of the optimal corresponding slope parameter among the above-mentioned preset ranges.

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