Inverted F antenna, control method and electronic device

Abstract

The present invention discloses an inverted F antenna, a control method and an electronic device; the inverted F antenna comprises: an antenna radiation unit and a feeding unit; the antenna radiation unit comprises at least two radiation arrays arranged in parallel; used to convert an input current signal into an electromagnetic wave signal and radiate it to space when the radiation array resonates; the feeding unit comprises an antenna feeding structure and an array feeding structure; one end of the array feeding structure is connected to the antenna radiation unit, and the other end is connected to the antenna feeding structure; used to transmit the current signal input by the antenna feeding structure to the antenna radiation unit through the array feeding structure. In this embodiment, the array feeding structure and the antenna radiation unit are connected to form a feeding network for current signal transmission, so that the current signal in the antenna feeding structure resonates through the feeding network and then generates an electromagnetic wave signal; thereby, the Q value at the resonant frequency of the inverted F antenna is reduced while the resonance loss is increased, thereby improving the bandwidth of the inverted F antenna.

Description

Technical Field

[0001] The present invention belongs to the technical field of wireless communications, and in particular relates to an inverted-F antenna, a control method and electronic equipment. Background Art

[0002] Wireless communication technology plays an important role in life and technology. However, with the application of various wireless technologies, spectrum resources are no longer abundant. Like many technologies, Wi-Fi technology is constantly improving and evolving to meet the growing demand for wireless communications. In 2020, the IEEE 802.11ax wireless standard was renamed Wi-Fi 6E. Since Wi-Fi 6E uses the 6G frequency band, it has the advantages of wider bandwidth, high concurrency and low latency compared to Wi-Fi 6 in the 5G frequency band.

[0003] The array antenna is a common resonant antenna. The array length is usually an odd multiple of a quarter wavelength, and it is divided into a monopole antenna and a dipole antenna. The monopole antenna has a simple structure, a high proportional frequency band, and an omnidirectional radiation field, so it is widely used in wireless communication products. In order to reduce the height of the array antenna, the inverted F antenna evolved from the monopole; the inverted F antenna structure is a resonant antenna.

[0004] Due to structural limitations, the bandwidth of traditional inverted F antennas is limited to a limited range, for example, the bandwidth in engineering is generally 10-20%. With the widening of bandwidth in wireless communication technology, traditional monopole inverted F antennas can no longer cover the operating frequency band of existing communication equipment. Summary of the invention

[0005] In view of the above problems existing in the prior art, an embodiment of the present invention provides an inverted-F antenna, a control method and an electronic device; the inverted-F antenna can provide a wider frequency band to solve the technical problem that the existing inverted-F antenna cannot meet the frequency band required by the communication equipment when working.

[0006] According to a first aspect of an embodiment of the present invention, an inverted-F antenna is provided, comprising: an antenna radiating unit, comprising at least two radiating arrays arranged in parallel; the antenna radiating unit is used to convert an input current signal into an electromagnetic wave signal and radiate it into space when the radiating array resonates; a feeding unit, comprising an antenna feeding structure and an array feeding structure; one end of the array feeding structure is connected to the antenna radiating unit, and the other end is connected to the antenna feeding structure; the feeding unit is used to transmit the current signal input by the antenna feeding structure to the antenna radiating unit through the array feeding structure.

[0007] Optionally, the inverted F antenna also includes: an antenna grounding unit, including an array grounding structure; one end of the array grounding structure is connected to the ground, and the other end is connected to the antenna radiating unit; the antenna grounding unit is used to direct the reverse current generated in the antenna radiating unit to the ground.

[0008] Optionally, the antenna radiation unit further includes: an array interconnection structure, which is arranged at one end of the radiation array and is used to connect any two adjacent radiation arrays; the array interconnection structure is used to compensate for the phase difference between two adjacent radiation arrays.

[0009] Optionally, the radiation array is a T-shaped structure; the radiation array includes a first port, a second port, and a third port; the first port and the second port are relatively arranged along the lateral extension direction of the T-shaped structure, and the third port is arranged along the longitudinal extension direction of the T-shaped structure.

[0010] Optionally, the at least two parallel arranged radiation arrays include a first radiation array, a second radiation array, and a third radiation array; the first port of the first radiation array and the first port of the second radiation array are connected via a first array interconnection structure; the first port of the second radiation array and the first port of the third radiation array are connected via a second array interconnection structure; the third port of the first radiation array, the third port of the second radiation array, and the third port of the third radiation array are all connected to the array feeding structure perpendicular to the ground; the second port of the first radiation array, the second port of the second radiation array, and the second port of the third radiation array are all vertically connected to one side of the array grounding structure.

[0011] Optionally, the antenna grounding unit also includes: a reflective floor; the reflective floor includes a rectangular floor located in the front direction and a triangular floor located in the rear direction and connected to the rectangular floor; the array grounding structure and the antenna feeding structure are both connected to the rectangular floor; the reflective floor is used to reflect the backward electromagnetic waves emitted by the antenna radiating unit back to the front direction.

[0012] Optionally, each of the radiating arrays in the antenna radiating unit has different lateral dimensions and the same longitudinal dimensions; the lateral dimensions of the radiating array are selected from preset multiples of the wavelength of the electromagnetic wave; and the difference between the resonant frequency points corresponding to two adjacent radiating arrays is less than a preset threshold.

[0013] Optionally, the array grounding structure is a trapezoidal structure; the inclined surface of the trapezoidal structure extends to the triangular floor in front of the reflective floor; the second port of the first radiating array, the second port of the second radiating array, and the second port of the third radiating array are all connected to the vertical surface of the trapezoidal structure; wherein the vertical surface is arranged opposite to the inclined surface.

[0014] According to the second aspect of an embodiment of the present invention, a control method for an inverted-F antenna is also provided, the control method comprising: receiving an external current signal through the antenna feeding structure of the inverted-F antenna; transmitting the external current signal to the antenna radiating unit through the array feeding structure; detecting the current signal of the antenna radiating unit; if the detection result indicates that the current signal reaches a preset threshold, performing a resonance operation on the antenna radiating unit to generate an electromagnetic wave signal; if the detection result indicates that the current signal does not reach the preset threshold, adjusting the external current signal received by the antenna feeding structure, and continuing to detect the adjusted current signal until an electromagnetic wave signal is generated; radiating the electromagnetic wave signal into space through the radiating array of the antenna radiating unit.

[0015] According to a third aspect of an embodiment of the present invention, there is also provided an electronic device, comprising a body and the inverted-F antenna as described in the first aspect, wherein the inverted-F antenna is disposed in the body.

[0016] The present invention provides an inverted F antenna, a control method and an electronic device; the inverted F antenna comprises: an antenna radiating unit and a feeding unit; the antenna radiating unit comprises at least two radiating arrays arranged in parallel; the antenna radiating unit is used to convert the input current signal into an electromagnetic wave signal and radiate it to space when the radiating array resonates; the feeding unit comprises an antenna feeding structure and an array feeding structure; one end of the array feeding structure is connected to the antenna radiating unit, and the other end is connected to the antenna feeding structure; the feeding unit is used to transmit the current signal input by the antenna feeding structure to the antenna radiating unit through the array feeding structure. In this embodiment, the array feeding structure and the antenna radiating unit are connected to form a feeding network for current signal transmission, so that the current signal in the antenna feeding structure resonates and generates an electromagnetic wave signal through the feeding network; thus, by setting an antenna radiating unit with a special structure, the Q value at the resonant frequency of the inverted F antenna is reduced while the resonance loss is increased, thereby improving the bandwidth of the inverted F antenna. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Hereinafter, some specific embodiments of the present invention will be described in detail in an exemplary and non-limiting manner with reference to the accompanying drawings. The same reference numerals in the accompanying drawings indicate the same or similar components or parts. It should be understood by those skilled in the art that these drawings are not necessarily drawn to scale. In the accompanying drawings:

[0018] Figure 1 A schematic diagram of the structure of an inverted-F antenna provided by an embodiment of the present invention;

[0019] Figure 2 A schematic top view of an inverted-F antenna provided by an embodiment of the present invention;

[0020] Figure 3 A schematic diagram of a partial structure of an inverted-F antenna provided by an embodiment of the present invention;

[0021] Figure 4 A schematic flow chart of a control method of an inverted-F antenna provided by one embodiment of the present invention;

[0022] Among them, 10, radiation array, 101, first radiation array, 102, second radiation array, 103, third radiation array, 20, antenna feeding structure, 30, array feeding structure, 40, array grounding structure, 50, array interconnection structure, 501, first array interconnection structure, 502, second array interconnection structure, 60, reflection floor. DETAILED DESCRIPTION

[0023] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0024] like Figure 1 As shown, it is a schematic diagram of the structure of an inverted F antenna provided by an embodiment of the present invention; Figure 2 , which is a top view schematic diagram of an inverted-F antenna provided by an embodiment of the present invention.

[0025] An inverted-F antenna, comprising:

[0026] The antenna radiation unit comprises at least two radiation arrays 10 arranged in parallel; the antenna radiation unit is used to convert the input current signal into an electromagnetic wave signal and radiate it into space when the radiation array 10 resonates;

[0027] The feeding unit includes an antenna feeding structure 20 and an array feeding structure 30; one end of the array feeding structure 30 is connected to the antenna radiating unit, and the other end is connected to the antenna feeding structure 20; the feeding unit is used to transmit the current signal input by the antenna feeding structure 20 to the antenna radiating unit through the array feeding structure 30.

[0028] Specifically, the antenna radiation unit of this embodiment can be a parallel structure formed by two parallel arranged radiation arrays 10, or a parallel structure formed by multiple parallel arranged radiation arrays 10. The antenna radiation unit of the parallel structure is connected to the array feeding structure 30 to form a feeding network for current signal transmission; after receiving the external current signal, the antenna feeding structure 20 sends the current signal to the array feeding structure 30, and then the current signal resonates through the feeding network to generate an electromagnetic wave signal, which is radiated into space through the antenna radiation unit.

[0029] In the parallel structure formed by at least two radiating arrays 10 arranged in parallel, each radiating array 10 has the same structure but different sizes. Therefore, by designing radiating arrays 10 of different sizes, radiating arrays 10 with different resonant frequencies can be obtained. In order to enable all radiating arrays 10 in the antenna radiating unit to resonate together through the feeding network, this embodiment designs the size of the radiating array 10 reasonably in combination with actual needs, so that the resonant frequency of each radiating array 10 in the antenna radiating unit can be designed to be close. When the resonant frequencies of each radiating array 10 in the antenna radiating unit are close to each other, each radiating array 10 can quickly resonate through the feeding network.

[0030] Compared with a conventional inverted-F antenna including only one radiating element 10, the inverted-F antenna of this embodiment uses at least two radiating elements 10, which not only increases the resonance loss of the antenna radiating unit, but also reduces the Q value of the inverted-F antenna at the resonant frequency, thereby increasing the bandwidth of the inverted-F antenna.

[0031] In a preferred implementation of this embodiment, when the radiation array 10 is a T-shaped structure; the radiation array 10 includes a first port, a second port, and a third port; the first port and the second port are relatively arranged along the lateral extension direction of the T-shaped structure, and the third port is arranged along the longitudinal extension direction of the T-shaped structure. Further preferably, the antenna radiation unit also includes: an array interconnection structure 50. The first port or the second port of any two adjacent radiation arrays 10 in the antenna radiation unit is connected through the array interconnection structure 50; thereby, when the current signal passes through the feeding network, the current phase difference on each radiation array 10 can be supplemented, thereby achieving the improvement of the frequency bandwidth of the inverted F antenna by eliminating the radiation stop band.

[0032] In another preferred implementation of this embodiment, the inverted F antenna further includes an antenna grounding unit; the antenna radiating unit includes an array grounding structure 40; one end of the array grounding structure 40 is connected to the ground, and the other end is connected to the antenna radiating unit; the antenna grounding unit is used to guide the reverse current generated in the antenna radiating unit to the ground. Therefore, by providing the array grounding structure 40, the reverse current of each radiating array 10 in the antenna radiating unit can be guided to the floor, thereby reducing the interference of the reverse current between each radiating array 10 on the electromagnetic wave signal, and improving the frequency bandwidth of the inverted F antenna.

[0033] In another preferred implementation of this embodiment, the lateral dimensions of each of the radiation arrays 10 in the antenna radiation unit are different and the longitudinal dimensions are the same; the lateral dimensions of the radiation array 10 are selected from a preset multiple of the electromagnetic wave wavelength; the difference between the resonant frequency points corresponding to two adjacent radiation arrays 10 is less than a preset threshold. For example: the lateral dimension is selected from an integer multiple of one quarter of the electromagnetic wave signal wavelength; when the current signal of the inverted F antenna is four times the lateral dimension, the inverted F antenna distribution can meet the boundary conditions of the strongest current on one side and the weakest current on the other side, thereby generating resonance, and then generating an electromagnetic wave signal, and radiating the electromagnetic wave signal to the outside.

[0034] like Figure 3 , which is a schematic diagram of the partial structure of an inverted-F antenna provided in one embodiment of the present invention.

[0035] In another preferred implementation manner of the present embodiment, at least two parallel arranged radiation arrays 10 include a first radiation array 101, a second radiation array 102, and a third radiation array 103; the first port of the first radiation array 101 and the first port of the second radiation array 102 are connected via a first array interconnection structure 501; the first port of the second radiation array 102 and the first port of the third radiation array 103 are connected via a second array interconnection structure 502; the third port of the first radiation array 101, the third port of the second radiation array 102, and the third port of the third radiation array 103 are all connected to the array feeding structure 30 perpendicular to the ground; the second port of the first radiation array 101, the second port of the second radiation array 102, and the second port of the third radiation array 103 are all vertically connected to one side of the array grounding structure 40.

[0036] Specifically, in this embodiment, the first radiating array 101, the second radiating array 102 and the third radiating array 103 are arranged in parallel in sequence; when the operating frequency of the inverted F antenna changes, the current flow direction in the first radiating array 101 and the third radiating array 103 is opposite to the current flow direction in the second radiating array 102, which is likely to form a radiation stop band in a certain frequency band; in this embodiment, the first ports of the three radiating arrays are connected in sequence through the first array interconnection structure 501 and the second array interconnection structure 502, and the radiation stop band that may be generated is eliminated by compensating for the current phase difference in each radiating array.

[0037] Since the longitudinal dimensions of the three radiating arrays are the same, the third ports of the three radiating arrays arranged in parallel are located in the same plane, and the second ports of the three radiating arrays are connected to the array grounding structure 40 through the array grounding structure 40. Thus, not only single-port feeding is achieved, but also the antenna radiating unit and the array grounding structure 40 form a feeding network for current signal transmission; the feeding network achieves feeding matching of the three radiating arrays through a three-power distribution network, so that the electromagnetic wave signal achieves optimal spatial distribution, thereby improving the bandwidth of the inverted F antenna.

[0038] In another preferred implementation manner of this embodiment, the antenna grounding unit also includes: a reflective floor 60; the reflective floor 60 includes a rectangular floor located in the front direction and a triangular floor located in the rear direction and connected to the rectangular floor; the array grounding structure 40 and the antenna feeding structure 20 are both connected to the rectangular floor; the reflective floor 60 is used to reflect the backward electromagnetic waves emitted by the antenna radiating unit back to the front direction.

[0039] Specifically, the rectangular floor and the triangular floor are seamlessly connected. The tail of the reflective floor 60 is a triangular structure; the triangular structure is asymmetrical with the rectangular structure at the front of the inverted F antenna, which can effectively improve the overall radiation direction of the inverted F antenna, thereby increasing the forward radiation of the reflective floor 60 and improving the bandwidth of the inverted F antenna.

[0040] In another preferred implementation of this embodiment, the array grounding structure 40 is a trapezoidal structure; the inclined surface of the trapezoidal structure extends to the triangular floor in front of the reflective floor 60; the second port of the first radiation array 101, the second port of the second radiation array 102, and the second port of the third radiation array 103 are all connected to the vertical plane of the trapezoidal structure; wherein the vertical plane is arranged opposite to the inclined surface. Specifically, the array grounding structure 40 of the trapezoidal structure is vertically placed on the reflective floor 60 and fixedly connected to the reflective floor 60. The three radiation arrays of the antenna radiation unit are arranged parallel to the reflective floor 60, and the second port of each radiation array is vertically connected to the vertical plane of the trapezoidal structure; wherein the vertical plane is a plane arranged opposite to the inclined surface of the trapezoidal structure. Therefore, by setting the array grounding structure 40 of the trapezoidal structure, the reverse current on the three radiation arrays in the antenna radiation unit can be effectively flowed to the floor, which solves the problem of frequency band reduction caused by reverse current crosstalk between multiple radiation arrays in the antenna radiation unit in the prior art.

[0041] The operating frequency band of the traditional inverted F antenna is only 10-20%; this embodiment uses the array interconnection structure to connect the parallel-arranged radiating arrays of different sizes in sequence to form an antenna radiating unit, and then connects the antenna radiating unit to the array feeding structure and the array grounding structure respectively; thereby increasing the resonance loss of the antenna radiating unit, supplementing the current phase difference on each radiating array, and reducing the interference of the reverse current between each radiating array to the electromagnetic wave signal. The bandwidth of the 3D inverted F antenna is improved; the 3D inverted F antenna in this embodiment can achieve a relative bandwidth of 50%, which is at least 1 times the bandwidth expansion of the traditional inverted F antenna.

[0042] like Figure 4 , which is a flow chart of a control method of an inverted-F antenna provided by an embodiment of the present invention.

[0043] A control method for an inverted-F antenna comprises at least the following steps:

[0044] S401, receiving an external current signal through an antenna feeding structure of an inverted-F antenna;

[0045] S402, transmitting the external current signal to the antenna radiation unit through the array feeding structure;

[0046] S403, detecting a current signal of the antenna radiation unit;

[0047] S404, if the detection result indicates that the current signal reaches a preset threshold, performing a resonance operation on the antenna radiation unit to generate an electromagnetic wave signal;

[0048] S405, if the detection result indicates that the current signal does not reach the preset threshold, adjusting the external current signal received by the antenna feeding structure, and continuing to detect the adjusted current signal until an electromagnetic wave signal is generated;

[0049] S406, radiate the electromagnetic wave signal into space through the radiation array of the antenna radiation unit.

[0050] The control method of this embodiment can automatically adjust the external current signal received by the antenna feeding structure based on the detection result of the current signal of the antenna radiation unit, so as to generate the electromagnetic wave signal of the inverted-F antenna, thereby reducing the manual operation in the electromagnetic wave signal generation process, realizing the automatic generation of the electromagnetic wave signal in the inverted-F antenna, and improving the efficiency of the electromagnetic wave signal generation in the inverted-F antenna.

[0051] Here, the preset threshold is an integer multiple of the wavelength of the electromagnetic wave; the specific value varies according to different application scenarios of the inverted-F antenna.

[0052] The present invention further provides an electronic device, comprising a body and an inverted-F antenna provided by an embodiment of the present invention, wherein the inverted-F antenna is arranged in the body.

[0053] In addition to the above-mentioned methods and devices, the control method of the embodiments of the present application may also be a computer program product, which includes computer program instructions, which, when executed by a processor, enable the processor to execute the steps of the method according to various embodiments of the present application described in the above-mentioned "Exemplary Method" section of this specification.

[0054] The computer program product may be written in any combination of one or more programming languages ​​to write program codes for performing the operations of the embodiments of the present application, including object-oriented programming languages, such as Java, C++, etc., and conventional procedural programming languages, such as "C" language or similar programming languages. The program code may be executed entirely on the user computing device, partially on the user device, as an independent software package, partially on the user computing device and partially on a remote computing device, or entirely on a remote computing device or server.

[0055] The basic principles of the present application are described above in conjunction with specific embodiments. However, it should be noted that the advantages, strengths, effects, etc. mentioned in the present application are only examples and not limitations, and it cannot be considered that these advantages, strengths, effects, etc. are required by each embodiment of the present application. In addition, the specific details disclosed above are only for the purpose of illustration and ease of understanding, not for limitation, and the above details do not limit the present application to being implemented by adopting the above specific details.

[0056] The above description has been given for the purpose of illustration and description. In addition, this description is not intended to limit the embodiments of the present application to the forms disclosed herein. Although multiple example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, changes, additions and sub-combinations thereof.

[0057] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples, unless they are contradictory.

[0058] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0059] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. An inverted F antenna, characterized in that: include: The antenna radiation unit comprises at least two radiation arrays arranged in parallel and an array interconnection structure; The array interconnection structure is arranged at one end of the radiation array and is used to connect any two adjacent radiation arrays; The array interconnection structure is used to compensate for the phase difference between two adjacent radiation arrays; the antenna radiation unit is used to convert the input current signal into an electromagnetic wave signal and radiate it into space when the radiation array resonates; A feeding unit, including an antenna feeding structure and an array feeding structure; One end of the array feeding structure is connected to the antenna radiating unit, and the other end is connected to the antenna feeding structure; The feeding unit is used to transmit the current signal input by the antenna feeding structure to the antenna radiation unit through the array feeding structure; The antenna grounding unit comprises an array grounding structure; one end of the array grounding structure is connected to the ground, and the other end is connected to the antenna radiation unit; the antenna grounding unit is used to guide the reverse current generated in the antenna radiation unit to the ground; The at least two radiation arrays arranged in parallel include a first radiation array, a second radiation array, and a third radiation array; the first port of the first radiation array and the first port of the second radiation array are connected via a first array interconnection structure; The first port of the second radiating array and the first port of the third radiating array are connected through a second array interconnection structure; the third port of the first radiating array, the third port of the second radiating array, and the third port of the third radiating array are all connected to the array feeding structure perpendicular to the ground; the second port of the first radiating array, the second port of the second radiating array, and the second port of the third radiating array are all vertically connected to one side of the array grounding structure.

2. The inverted-F antenna according to claim 1, characterized in that: The radiation array is a T-shaped structure; the radiation array includes a first port, a second port, and a third port; the first port and the second port are relatively arranged along the lateral extension direction of the T-shaped structure, and the third port is arranged along the longitudinal extension direction of the T-shaped structure.

3. The inverted-F antenna according to claim 1, characterized in that: The antenna grounding unit also includes: a reflective floor; the reflective floor includes a rectangular floor located in the front direction and a triangular floor located in the rear direction and connected to the rectangular floor; the array grounding structure and the antenna feeding structure are both connected to the rectangular floor; the reflective floor is used to reflect the backward electromagnetic waves emitted by the antenna radiating unit back to the front direction.

4. The inverted-F antenna according to claim 2, characterized in that: The lateral dimensions of each radiation array in the antenna radiation unit are different and the longitudinal dimensions are the same; the lateral dimensions of the radiation array are selected from preset multiples of the wavelength of the electromagnetic wave; The difference between the resonant frequency points corresponding to two adjacent radiation arrays is smaller than a preset threshold.

5. The inverted-F antenna according to claim 3, characterized in that: The array grounding structure is a trapezoidal structure; the inclined surface of the trapezoidal structure extends to the triangular floor in front of the reflective floor; the second port of the first radiation array, the second port of the second radiation array, and the second port of the third radiation array are all connected to the vertical surface of the trapezoidal structure; wherein the vertical surface is arranged opposite to the inclined surface; The electromagnetic wave signal is radiated into space through the radiation array of the antenna radiation unit.

6. An electronic device comprising a body and the inverted-F antenna according to any one of claims 1 to 5, wherein the inverted-F antenna is arranged in the body.

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