Cavity-backed antenna

Abstract

In order to solve the problem of how to simultaneously have an antenna with small size and small interference, the utility model provides a back cavity antenna, which comprises a back cavity, which is a metal cavity with an opening and comprises a pair of first quadrilateral bodies, a pair of second quadrilateral bodies and a third quadrilateral body, including but not limited to rectangular bodies; the antenna body is arranged at the opening of the metal cavity, namely the opposite surface of the third quadrilateral body, and is provided with a circuit, and a signal feed-in point and a signal grounding point which are arranged on the circuit; wherein the back cavity can be provided with a wire arrangement hole in the second quadrilateral body to enable a feed-in wire to pass through the interior of the cavity, or can be provided with a grounding limiting hole in the first quadrilateral body to control the lap joint range of the antenna body and the back cavity, interference of the surrounding environment on the antenna is reduced through the back cavity, and the size of the back cavity is within the range of one fourth of the wavelength of the lowest resonance frequency band. And the best efficiency of the antenna in a specific frequency range is ensured.

Description

Technical Field

[0001] The utility model relates to a cavity-backed antenna, which can achieve the effect of reducing the cavity size. Background Art

[0002] With the advancement and development of science and technology, in order to improve the portability and transportation convenience of various products, the size of products is showing a trend of miniaturization. As the demand for miniaturization increases, the precision requirements of internal parts are also increased, making the size of internal parts of products smaller to meet the requirements of electronic products for installation space.

[0003] In addition, in order to ensure the best performance of the antenna within a specific frequency range, a special cavity size is required. How to have an antenna that is small in size and less susceptible to interference to meet the communication needs of the application is a problem that has yet to be solved. Utility Model Content

[0004] In order to solve the above problems, the purpose of the utility model is to use a back cavity antenna, while reducing the size and reducing environmental interference. The antenna body and the back cavity are both conductive, and the antenna body is electrically connected to the back cavity and combined into one body for transmitting and receiving signals; the positive pole of the signal source is electrically connected to the excitation part of the antenna body to adjust the impedance matching, the negative pole of the signal source is electrically connected to the back cavity and the grounding part of the antenna body, and the radiating part is formed by extending the grounding part of the antenna body to generate multiple resonant frequency bands.

[0005] The utility model provides a back cavity antenna, comprising: a back cavity, which comprises a pair of first quadrilaterals, a pair of second quadrilaterals and a third quadrilateral, wherein a grounding limiting hole can be arranged on one side of the pair of first quadrilaterals, and a wire management hole can be arranged on one of the pair of second quadrilaterals; and an antenna body, which is arranged on the opposite side of the third quadrilateral of the back cavity, and has a circuit composed of an excitation part, a radiation part and a grounding part, and a signal source arranged on the circuit, wherein the positive pole of the signal source is located at a signal feeding point of the excitation part, the negative pole of the signal source is located at a signal grounding point of the grounding part, and the radiation part is extended from the grounding part; the excitation part and the radiation part on the antenna body are connected to each other. There are slots between the excitation part and between the excitation part and the grounding part, the grounding part is respectively connected to the radiation part and the excitation part, and is electrically connected to the back cavity; the first excitation part, the second excitation part, the third excitation part, the fourth excitation part and the fifth excitation part of the excitation part are connected to each other, the fourth excitation part and the first excitation part are separated by a gap, the first radiation part and the second radiation part of the radiation part are connected to each other, the fourth radiation part and the fifth radiation part are connected to each other, the sixth radiation part is connected between the first radiation part and the fourth radiation part, the first radiation part, the third radiation part and the sixth radiation part are connected and a gap is maintained therein.

[0006] In one embodiment, the signal feeding point is disposed on a first excitation portion of the excitation portion.

[0007] In one embodiment, the signal feeding point is disposed on the second excitation portion of the excitation portion.

[0008] In one embodiment, the first excitation portion, the second excitation portion, the third excitation portion, the fourth excitation portion and the fifth excitation portion of the excitation portion are connected to each other, the fourth excitation portion and the first excitation portion are separated by a gap, the fifth excitation portion of the excitation portion extends in the opposite direction of the first direction to be flush with the boundary of the fourth, the first excitation portion, the second excitation portion, the third excitation portion, the fourth excitation portion, the fifth excitation portion and the sixth excitation portion of the radiation portion are connected to each other, the second excitation portion and the third excitation portion extend in the opposite direction of the first direction to the boundary of the antenna body, and the radiation portion retains a gap therebetween.

[0009] In one embodiment, the first excitation portion, the second excitation portion, the third excitation portion, the fourth excitation portion and the fifth excitation portion of the excitation portion are connected to each other, the fourth excitation portion and the fifth excitation portion are separated by a gap, the first radiation portion, the second radiation portion, the third radiation portion, the fourth radiation portion, the fifth radiation portion and the sixth radiation portion of the radiation portion are connected to each other, the second radiation portion and the fifth radiation portion are connected to each other, the sixth radiation portion extends along the second direction but is not connected to the fifth radiation portion, and the radiation portion has a gap therebetween.

[0010] In summary, the utility model provides a back cavity antenna, comprising: a back cavity, which includes a pair of first quadrilaterals, a pair of second quadrilaterals and a third quadrilateral; and an antenna body, which is arranged on the opposite side of the third quadrilateral, and has an excitation part, a radiation part and a grounding part, and a feeding point arranged on the excitation part is electrically connected to the positive pole of the signal source, and a grounding point arranged on the grounding part is electrically connected to the negative pole of the signal source, and the grounding part is electrically connected to the first quadrilateral of the back cavity to reduce the interference of the antenna by the environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the cavity-backed antenna structure of the utility model;

[0012] Figure 2 It is a schematic diagram of the antenna body of the cavity-backed antenna of the utility model;

[0013] Figure 3 It is a schematic diagram of the antenna body of the cavity-backed antenna of the utility model;

[0014] Figure 4 It is a voltage standing wave ratio curve diagram of the cavity-backed antenna of the utility model;

[0015] Figure 5 It is a voltage standing wave ratio curve diagram of different embodiments of the cavity-backed antenna of the present invention.

[0016] Description of Figure Numbers

[0017] 100: Cavity-backed antenna

[0018] 101: Back cavity

[0019] 102: Antenna body

[0020] 110: Excitation Department

[0021] 111: First Excitation Section

[0022] 112: Second excitation unit

[0023] 113: The third excitation section

[0024] 114: Fourth Excitation Section

[0025] 115: Fifth Excitation Section

[0026] 120: Radiation Department

[0027] 121: First radiating section

[0028] 122: Second radiation unit

[0029] 123: The third radiation

[0030] 124: The Fourth Radiation Department

[0031] 125: Fifth Radiation Department

[0032] 126: Sixth Radiation Department

[0033] 130: Grounding

[0034] 131: First slot

[0035] 132: Second slot

[0036] 1011: Ground limit hole

[0037] 1012: Cable management hole

[0038] 1013: The First Quadrilateral

[0039] 1014: Second quadrilateral

[0040] 1015: The Third Quadrilateral

[0041] 1021: Feed point

[0042] 1022: Grounding point

[0043] FBL1: First low frequency band

[0044] FBL2: Second Low Frequency Band

[0045] FBH1: First high frequency band

[0046] FBH2: Second high frequency band

[0047] FBH3: Third high frequency band

[0048] FBH4: Fourth high frequency band DETAILED DESCRIPTION

[0049] The same reference numerals in different figures represent the same or similar components, and thus perform similar functions. In addition, in order to simplify the description, the description and details of well-known steps and components are omitted. In addition, in the following detailed description of the content of the utility model, in order to provide a comprehensive understanding of the content of the utility model, many specific details are listed. However, it is understood that the content of the utility model can be implemented without these specific details. In other cases, well-known methods, procedures and components are not described in detail to avoid unnecessary concealment of various aspects of the utility model. The following will further illustrate and describe examples of various embodiments. It is understood that the description here is not intended to limit the claims to the specific embodiments described. On the contrary, it is intended to cover substitutes, modifications and equivalents that may be included in the spirit and scope of the utility model defined by the attached claims.

[0050] The terms used in the present invention are only used to describe specific embodiments and are not intended to limit the content of the present invention. As used herein, the singular form: "one" may also include the plural form, unless the context clearly indicates otherwise. It will be further understood that "include" and "comprise" when used in this specification specify the presence of the features, wholes, operations, components and / or assemblies, but do not exclude the presence or addition of one or more other features, wholes, operations, components, assemblies and / or parts thereof.

[0051] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the implementation methods in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by technicians in the relevant technical field without making progressive utility models are within the scope of protection of the utility model.

[0052] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and technicians in the relevant technical field may make similar extensions without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0053] Secondly, the present invention is described in detail in conjunction with schematic diagrams. When describing the embodiments of the present invention in detail, for the sake of ease of explanation, the schematic diagrams are only examples and should not limit the scope of protection of the present invention.

[0054] like Figure 1 and Figure 2 As shown, a cavity-backed antenna 100 provided by the utility model comprises: a cavity-backed antenna 101, which comprises a pair of first quadrilaterals 1013, a pair of second quadrilaterals 1014 and a third quadrilateral 1015, which may be, for example, a metal substrate, formed into a metal cavity, the cavity-backed antenna 101 is used for reflecting low-frequency electromagnetic waves and resonating high-frequency electromagnetic waves, so that it can effectively transmit and receive signals and reduce noise reception; and an antenna body 102, which is arranged on the opposite side of the third quadrilateral 1015 and has a circuit composed of an excitation part 110, a radiation part 120 and a grounding part 130, and a signal source arranged on the circuit, the positive pole of the signal source is arranged at a feeding point 1021 on the excitation part 110 and the negative pole of the signal source is arranged at a grounding point 1022 on the grounding part 130, the radiation part is extended from the grounding part 130, and the signal input method between the feeding point 1021 and the grounding point 1022 may be, for example, a coaxial cable (Coaxial A pair of the first quadrilaterals 1013 may be provided with a ground limiting hole 1011, and one of the pair of the second quadrilaterals 1014 may be provided with a cable management hole 1012. Therefore, by configuring the back cavity 101, the back cavity antenna 100 can reduce the interference of environmental noise, thereby reducing the interference of other devices in the system.

[0055] Specifically, the grounding portion 130 is connected to the radiation portion 120 and the excitation portion 110 respectively, and is electrically connected to the back cavity 101, and a resonant mode is generated through the antenna body 102 and the back cavity 101. By accurately adjusting the radiation portion 120, the back cavity antenna 100 can generate a desired frequency band, and adjusting the excitation portion 110 can improve its efficiency and performance. The circuit of the antenna body 102 can be, for example, a metal sheet, a microstrip line, a metal wire or other conductive body with a conductive effect. However, the utility model is not limited thereto. Moreover, the back cavity antenna 100 can include multiple different frequency bands. By adjusting the frequency response of the back cavity antenna 100, it can operate in multiple frequency bands at the same time with reliability and stability. Specifically, the length of the radiation portion 120 can be used to adjust the frequency offset (Frequency Band Offset) of the first low frequency band FBL1, the second low frequency band FBL2, the first high frequency band FBH1, and the third high frequency band FBH3, and the length of the fifth excitation portion can be used to adjust the second high frequency band FBH2 and the fourth high frequency band FBH4. In this structure, the required length of the cavity-backed antenna 100 is approximately a quarter wavelength of the lowest resonant frequency band.

[0056] Specifically, in one embodiment, the antenna body 102 and the back cavity 101 are electrically connected through the grounding portion 130 , and the feeding point 1021 of the excitation portion 110 and the grounding point 1022 of the grounding portion 130 excite the antenna body 102 to generate a resonance mode with the back cavity 101 .

[0057] Specifically, in one embodiment, the grounding limiting hole 1011 has the same horizontal height and the wiring hole 1012 has the same horizontal height, and can also be set at different horizontal heights and / or different lengths and widths, presenting an "I" shape or other shapes. The height and length of the grounding limiting hole 1011 can be changed according to design requirements, which is not necessary.

[0058] Specifically, in one embodiment, the radiating portion 120 and the excitation portion 110 of the antenna body 102 and the back cavity 101 are electrically connected respectively through the grounding portion 130, and slots are respectively provided between the excitation portion 110 and the radiating portion 120 and between the excitation portion 110 and the grounding portion 130 on the antenna body 102. A first slot 131 is provided between the excitation portion 110 and the grounding portion 130 on the antenna body 102, and a second slot 132 is provided between the excitation portion 110 and the radiating portion 120. The excitation portion 110 is mainly for impedance matching, and the first slot 131 and the second slot 132 can be roughly separated by the feeding point 1021. With the change of the first slot 131 and the second slot 132, the current path will also increase or decrease, so as to adjust the impedance matching of the required resonance mode and the frequency offset of the resonance frequency band.

[0059] like Figure 1 , Figure 2 and Figure 3As shown, in one embodiment, the structures of the excitation part 110 and the radiating part 120 of the first type of antenna body 102 are as follows: the first excitation part 111, the second excitation part 112, the third excitation part 113, the fourth excitation part 114 and the fifth excitation part 115 of the excitation part 110 are connected to each other, and a gap is set between the fourth excitation part 114 and the first excitation part 111 to separate them. The first radiating part 121 and the second radiating part 122 of the radiating part 120 are connected to each other, the fourth radiating part 124 and the fifth radiating part 125 are connected to each other, and the sixth radiating part 126 is connected between the first radiating part 121 and the fourth radiating part 124. The first radiating part 121, the third radiating part 123 and the sixth radiating part 126 are connected and keep a gap therein, which can enhance the overall radiation efficiency of the antenna body 102 so that it can be more effective in a specific frequency range. The antenna body 102 has better performance within the range, improves the anti-interference ability of the antenna body 102, ensures the stability and reliability of signal transmission, and adjusts the radiation characteristics of the antenna body 102, such as changing the radiation direction, increasing the beam focusing effect, etc., to meet the needs of specific application scenarios and improve the selectivity of the antenna body 102 to specific frequencies; the resonant frequency band is adjusted by adjusting the geometric shape, relative position, and length of the radiation part 120. Specifically, the second radiation part 122 and the third radiation part 123 can adjust the first low-frequency band FBL1 and the first high-frequency band FBH1, and the fourth radiation part 124 and the fifth radiation part 125 can adjust the first low-frequency band FBL1. The geometric shape is not limited to this and can be changed to other polygons as needed. The range of electrical connection between the grounding part 130 and the back cavity 101 can also be adjusted through the grounding limiting hole 1011 to change the current path.

[0060] Specifically, in one embodiment, the signal feed point is set on the first excitation part 111 of the excitation part 110, and the change to the radiation path of the fourth excitation part 114 can adjust the impedance matching of the antenna, and the change of the third excitation part along the first direction can adjust the frequency deviation and bandwidth of the low frequency generation, and the change of the fifth excitation part along the first direction can adjust the frequency deviation of the second high frequency band FBH2 to achieve the desired resonance mode. The impedance matching of the antenna structure can also be adjusted by adjusting the gap between the grounding part 130 and the excitation part 110, that is, the first slot 131.

[0061] Specifically, in one embodiment, the signal feeding point is disposed on the second excitation portion 112 of the excitation portion 110 , and the impedance matching and high-band frequency deviation can be adjusted by adjusting the gap between the excitation portion 110 and the radiation portion 120 , namely the second slot 132 .

[0062] In addition, the frequency band of the antenna can be adjusted by changing the shape of the line pattern of the antenna body 102; Figure 1 and Figure 3As shown, the second type of antenna body 102 is based on the first type of antenna body 102 and the shape of the line pattern is adjusted. The repeated parts are not repeated here. The fifth excitation portion 115 of the excitation portion is extended in the opposite direction of the first direction to be flush with the boundary of the fourth excitation portion 114. The second radiation portion 122 and the fifth radiation portion 125 are connected to each other. The sixth radiation portion 126 is extended in the second direction to connect the fifth radiation portion 125. The second excitation portion 112 and the third radiation portion 123 are extended in the opposite direction of the first direction to the boundary of the antenna body 102. The feeding point is set at the second excitation portion 112. The extension length of each radiation portion can be changed to obtain the desired resonance mode.

[0063] Then, if Figure 1 and Figure 3 As shown, the third type of antenna body 102 is based on the first type of antenna body 102 and the shape of the line pattern is adjusted. The repeated parts are not repeated. The second radiating portion 122 and the fifth radiating portion 125 are connected to each other, and the sixth radiating portion 126 extends along the second direction but is not connected to the fifth radiating portion 125. The extension length of each radiating portion can be changed to obtain the desired resonance mode.

[0064] The excitation portion 110 and the radiation portion 120 structures of the first to third types of antenna bodies 102 may be formed by patterned metal lines formed directly on the surface of the antenna body 102. The pattern for forming the metal in the antenna body 102 may be generated by selectively activating the desired surface area on the plastic carrier using laser direct structuring (LDS) technology, which is then electroplated or otherwise coated with metal to form a patterned metal structure or molded interconnect device (MID) technology for photolithographic patterning. The antenna body 102 may be provided with metal lines, and the antenna body 102 may be attached to the back cavity 101 using adhesives, welding, fusion, screws or other fastening configurations.

[0065] like Figure 4 and Figure 5 As shown, Figure 4 The VSWR is a parameter used to measure the reflection degree of the electrical signal in the transmission line. It is caused by the impedance mismatch of the transmission line and is usually used to measure the matching performance of the antenna. Figure 4According to the measurement results, when excited by a signal source, the cavity-backed antenna 100 can cover a first low-frequency band FBL1, a first high-frequency band FBH1, and a second high-frequency band FBH2. For example, the first low-frequency band FBL1 can be between 2.3 GHz and 2.6 GHz, the first high-frequency band FBH1 can be between 5.0 GHz and 6.0 GHz, and the second high-frequency band FBH2 can be between 5.9 GHz and 7.5 GHz. Therefore, the cavity-backed antenna 100 will at least support broadband operations of traditional WLAN (Wireless Wide Area Network) and the new generation Wi-Fi 6E.

[0066] Voltage standing wave ratio (VSWR) is usually expressed as a number, ranging from 1 to infinity, where 1 indicates perfect matching, i.e. no reflection; and greater than 1 indicates reflection. If the VSWR is 3, it means that 50% of the signal is reflected back to the source end of the transmission line, which will cause signal loss and reduced antenna efficiency, which is caused by Figure 4 It can be seen from the exemplary example data and VSWR graph in that the values ​​in the first low frequency band, the first high frequency band, and the second high frequency band are all less than 3, and there is less signal reflection.

[0067] Figure 4 The exemplary example data on the performance of Voltage Standing Wave Ratio (VSWR) are shown in the following table.

[0068] Experimental data Frequency (GHz) VSWR experimental value 1 2.4 2.12 2 2.5 2.05 3 5.15 2.99 4 5.85 1.99 5 5.93 2.16 6 7.13 1.93

[0069] Figure 5 The voltage standing wave ratio (VSWR) waveform of the cavity-backed antenna adjusted according to the second embodiment of the utility model is shown in FIG. Figure 5 As shown, the structure of the cavity-backed antenna 100 of the present invention maintains a relatively low voltage standing wave (VSWR) in the frequency range of the second low frequency band FBL2, the third high frequency band FBH3, and the fourth high frequency band FBH4, such as 2.4 GHz to 7.125 GHz, especially in the frequency bands of 2.4 GHz to 2.5 GHz, 5.15 GHz to 5.925 GHz, and 5.925 GHz to 7.125 GHz, wherein the 1.19 VSWR value of 5.85 GHz is closest to 1, indicating that there is almost no signal reflection. Therefore, the cavity-backed antenna 100 will at least support different transmission frequency bands of 3G, 4G, WiFi, Bluetooth, LTE, and the new generation Wi-Fi 6E. Of course, the frequency band with a lower voltage standing wave (VSWR) can actually be achieved by appropriately adjusting the circuit of the antenna body 102, and the length of the cavity size of the cavity 101 can be reduced to a quarter wavelength range of the required lowest frequency band, but it is not limited to this.

[0070] Figure 5 The exemplary data on the performance of the adjusted Voltage Standing Wave Ratio (VSWR) are shown in the following table.

[0071] Experimental data Frequency (GHz) VSWR experimental value 1 2.4 1.47 2 2.5 1.99 3 5.15 1.52 4 5.85 1.19 5 5.93 1.55 6 7.13 1.38

[0072] The signal feeding point 1021 and the signal grounding point 1022 of the cavity-backed antenna 100 of the present invention distinguish the first slot 131 and the second slot 132. The operating principle of the cavity-backed antenna 100 can be described as follows. The radiating portion 120 is electrically connected to the negative pole of the signal source to generate a fundamental resonant mode (Fundamental Resonant Mode) to form the aforementioned second low-frequency band FBL2, third high-frequency band FBH3, and fourth high-frequency band FBH4. The positive pole of the signal source is electrically connected to the excitation portion 110, and the resonant mode is generated through the cavity-backed antenna 101 and the resonant frequency band is adjusted; the impedance matching is adjusted by the position of the signal feeding point 1021 and the excitation portion 110, so as to achieve performance optimization according to actual needs, such as lower VSWR and higher radiation efficiency. The metal radiating portion 120 can be, for example, a metal sheet, a microstrip line, a metal wire, or other conductive body with a conductive effect, however, the present invention is not limited thereto.

[0073] Finally, the technical features of the utility model and the technical effects that can be achieved are summarized as follows:

[0074] First, the maximum size of the cavity can be reduced, thereby increasing the application range of the cavity-backed antenna.

[0075] Second, reduce signal reflection in a specific frequency band.

[0076] In summary, the cavity-backed antenna provided by the present invention not only overcomes the prior art obstacles described in the prior art, but also reduces size, reduces noise interference, and improves the stability of the cavity-backed antenna.

[0077] Various embodiments of the present invention have been described in detail above. However, a person skilled in the art may make various modifications to the above embodiments 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 by the claims described below and their equivalents.

Claims

1. A cavity-backed antenna, characterized in that: include: A back cavity, comprising a pair of first quadrilaterals, a pair of second quadrilaterals and a third quadrilateral, wherein one side of the pair of first quadrilaterals has a ground limiting hole, and one of the pair of second quadrilaterals has a wire management hole; and The antenna body is arranged on the opposite surface of the third quadrilateral, and has a circuit composed of an excitation part, a radiating part and a grounding part, and a signal source arranged on the circuit, the positive pole of the signal source is located at the signal feeding point of the excitation part, the negative pole of the signal source is located at the signal grounding point of the grounding part, and the radiating part is extended by the grounding part; wherein, there are slots between the excitation part and the radiating part and between the excitation part and the grounding part on the antenna body, and the grounding part is respectively connected to the radiating part and the excitation part, and is electrically connected to the back cavity; the first excitation part, the second excitation part, the third excitation part, the fourth excitation part and the fifth excitation part are connected to each other, and a gap is set between the fourth excitation part and the fifth excitation part, the first radiating part and the second radiating part of the radiating part are connected to each other, the fourth radiating part and the fifth radiating part are connected to each other, the sixth radiating part is connected between the first radiating part and the fourth radiating part, and the first radiating part, the third radiating part and the sixth radiating part are connected and a space is kept therein, so as to improve the anti-interference ability of the antenna body, adjust the radiation characteristics and the selectivity to a specific frequency.

2. The cavity-backed antenna according to claim 1, characterized in that: The signal feeding point is arranged on the first exciting portion of the exciting portion.

3. The cavity-backed antenna according to claim 1, characterized in that: The signal feeding point is arranged on the second exciting portion of the exciting portion.

4. The cavity-backed antenna according to claim 1, characterized in that: The first excitation part, the second excitation part, the third excitation part, the fourth excitation part and the fifth excitation part of the excitation part are connected to each other, the fourth excitation part and the first excitation part are separated by a gap, the fifth excitation part of the excitation part extends in the opposite direction of the first direction to be flush with the boundary of the fourth excitation part, the first radiation part, the second radiation part, the third radiation part, the fourth radiation part, the fifth radiation part and the sixth radiation part of the radiation part are connected to each other, the second excitation part and the third radiation part extend in the opposite direction of the first direction to the boundary of the antenna body, and the radiation part leaves a gap therebetween.

5. The cavity-backed antenna according to claim 1, characterized in that: The first excitation portion, the second excitation portion, the third excitation portion, the fourth excitation portion and the fifth excitation portion of the excitation portion are connected to each other, the fourth excitation portion and the fifth excitation portion are separated by a gap, the first radiation portion, the second radiation portion, the third radiation portion, the fourth radiation portion, the fifth radiation portion and the sixth radiation portion of the radiation portion are connected to each other, the second radiation portion and the fifth radiation portion are connected to each other, the sixth radiation portion extends along the second direction but is not connected to the fifth radiation portion, and the radiation portions have gaps therebetween.

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