Circularly polarized antenna

Abstract

The utility model provides a circularly polarized antenna, and the antenna employs a single-layer dielectric substrate which is provided with a square groove. A feed port is arranged in the square groove; the feed port is electrically connected with the T-shaped branch knot; the dielectric substrate comprises two rectangular branches extending towards the square groove, and the two rectangular branches are arranged on the two sides of the square groove in a staggered mode. In the first direction, the two rectangular branches are arranged above the T-shaped branch; the first direction is parallel to the direction from the vertical end to the transverse end of the T-shaped branch knot; the two rectangular branches are related to the axial ratio bandwidth and the wave beam. In conclusion, by means of the simple branch knot structure, accurate control over the axial ratio bandwidth and the wave beam is achieved, then the requirement of a current small relay can be met, and the actual requirement can be met.

Description

Technical Field

[0001] This disclosure relates to the field of antennas, and more particularly to a circularly polarized antenna. Background Technology

[0002] Currently, traditional bidirectional circularly polarized antennas typically employ a back-to-back feeding method, which increases the antenna's size and weight, complicates its structure, and makes it difficult to meet the requirements of current miniaturized repeater stations in terms of axial ratio bandwidth and beamwidth, thus failing to meet practical needs. Utility Model Content

[0003] This disclosure provides a circularly polarized antenna, which to some extent solves the problems of existing antennas having increased size and weight, complex structure, and insufficient axial ratio bandwidth and beamwidth to meet the needs of current miniaturized relay stations, thus failing to meet practical requirements.

[0004] According to one aspect of this disclosure, a circularly polarized antenna is provided. The antenna employs a single-layer dielectric substrate, and the dielectric substrate is provided with a square slot. A feed port is provided in the square slot. The feed port is electrically connected to a T-shaped stub. The dielectric substrate includes two rectangular stubs extending into the square slot, and the two rectangular stubs are staggered on both sides of the square slot. In a first direction, the two rectangular stubs are located above the T-shaped stub. The first direction is parallel to the direction from the vertical end of the T-shaped stub to the horizontal end. The two rectangular stubs are related to the axial ratio bandwidth and beam.

[0005] Furthermore, the two rectangular stubs include a first rectangular stub and a second rectangular stub; the size of the first rectangular stub is related to the axial ratio bandwidth, and the size of the second rectangular stub is related to the beam.

[0006] Furthermore, the first rectangular branch and the T-shaped branch are spaced apart in the first direction.

[0007] Furthermore, the second rectangular branch is spaced apart from the first rectangular branch in the first direction, and the second rectangular branch is located above the first rectangular branch; in the projection direction of the second direction, the projections of the first rectangular branch and the second rectangular branch do not overlap; wherein, the second direction is perpendicular to the first direction; in the projection direction of the first direction, the projections of the first rectangular branch and the second rectangular branch do not overlap.

[0008] Furthermore, the first rectangular branch is set on the first side of the square groove, and the second rectangular branch is set on the second side of the square groove; or, the first rectangular branch is set on the second side of the square groove, and the second rectangular branch is set on the first side of the square groove.

[0009] Furthermore, the first side of the first rectangular branch and the second side of the second branch are both parallel to the first direction; the third side of the first rectangular branch and the fourth side of the second rectangular branch are both perpendicular to the first direction.

[0010] Furthermore, the horizontal length of the T-shaped branch is greater than the vertical length of the T-shaped branch.

[0011] Furthermore, the size of the T-shaped stub is related to the radiation frequency.

[0012] Furthermore, the dielectric substrate is a printed circuit board (PCB).

[0013] Furthermore, the power supply port is equipped with an outer conductor and an inner conductor;

[0014] The outer conductor is connected to the ground plane of the PCB, and the inner conductor is connected to the T-shaped stub through a via.

[0015] This disclosure provides a circularly polarized antenna. The antenna employs a single-layer dielectric substrate with a square slot. A feed port is located within the square slot and electrically connected to a T-shaped stub. The dielectric substrate includes two rectangular stubs extending into the square slot, offset from one side of the slot. In a first direction, the two rectangular stubs are positioned above the T-shaped stub. This first direction is parallel to the direction from the vertical end of the T-shaped stub to its horizontal end. The two rectangular stubs are associated with axial ratio bandwidth and beamwidth. Thus, by using a single-layer dielectric substrate and cleverly arranging a T-shaped stub and two rectangular stubs associated with axial ratio bandwidth and beamwidth respectively within the square slot, the polarization characteristics and beam direction of the antenna can be changed by adjusting the two rectangular stubs, thereby achieving flexible control of axial ratio bandwidth and beamwidth. Therefore, the technical solution provided by this disclosure achieves precise control of axial ratio bandwidth and beamwidth through a simple stub structure, meeting the current needs for miniaturized repeaters and fulfilling practical requirements.

[0016] It should be understood that both the foregoing general description and the following detailed description are exemplary and intended to provide further illustration of the claimed technology. Attached Figure Description

[0017] The above and other objects, features, and advantages of this disclosure will become more apparent from the more detailed description of the embodiments thereof in conjunction with the accompanying drawings. The drawings are provided to further illustrate the embodiments of this disclosure and form part of the specification. They are used together with the embodiments of this disclosure to explain the disclosure and do not constitute a limitation thereof. In the drawings, the same reference numerals generally represent the same components or steps.

[0018] Figure 1 This is a schematic diagram of the structure of a circularly polarized antenna provided in an embodiment of this disclosure;

[0019] Figure 2 A design flowchart of a circularly polarized antenna provided in an embodiment of this disclosure;

[0020] Figure 3Simulation results for beam adjustment of the circularly polarized antenna provided in the embodiments of this disclosure;

[0021] Figure 4 Simulation results for the axial ratio bandwidth of the circularly polarized antenna provided in the embodiments of this disclosure;

[0022] Figure 5 The radiation simulation diagram of dual polarization of a circularly polarized antenna provided in the embodiments of this disclosure. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this disclosure more apparent, exemplary embodiments according to this disclosure will now be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of this disclosure, and not all embodiments of this disclosure. It should be understood that this disclosure is not limited to the exemplary embodiments described herein.

[0024] Currently, traditional bidirectional circularly polarized antennas typically employ a back-to-back feeding method, which increases the antenna's size and weight, complicates its structure, and makes it difficult to meet the requirements of current miniaturized repeater stations in terms of axial ratio bandwidth and beamwidth, thus failing to meet practical needs.

[0025] Therefore, this application proposes a circularly polarized antenna that uses a single-layer dielectric substrate. Through cleverly designed T-shaped stubs and two rectangular stubs respectively associated with the axial ratio bandwidth and beam, flexible control of the axial ratio bandwidth and beam can be achieved. Please refer to... Figure 1 , Figure 1 This is a schematic diagram of the structure of a circularly polarized antenna provided in an embodiment of this disclosure. Figure 1 It can be seen that:

[0026] The antenna uses a single-layer dielectric substrate with a square slot; a feed port is provided in the square slot; the feed port is connected to the T-shaped branch for power saving.

[0027] The dielectric substrate includes two rectangular branches extending into a square groove, the two rectangular branches being staggered on both sides of the square groove;

[0028] In the first direction, two rectangular branches are positioned above the T-shaped branch; the first direction is parallel to the direction from the vertical end of the T-shaped branch to the horizontal end.

[0029] The two rectangular stubs are related to the axial ratio bandwidth and beamwidth.

[0030] In this embodiment, the circularly polarized antenna may include: a square slot, a feed port, a T-shaped stub, and two rectangular stubs. Specifically, the square slot can be understood as... Figure 1 The recessed area, indicated by white in the center, provides layout space for the feed port and other stubs. Its shape and position also influence the electromagnetic field distribution inside the antenna. The feed port is... Figure 1 The bottom port of the square slot serves as the signal input interface, introducing radio frequency signals into the antenna system to provide energy for subsequent radiation. The T-shaped stub, on the other hand, is... Figure 1 The specially shaped stubs, which connect to the feed port and extend upwards, play a crucial role in signal transmission and distribution through their horizontal and vertical dimensions and structural design, determining the antenna's basic radiation characteristics. Rectangular stubs, located on either side of the square slot and on the T-shaped stubs, are closely related to axial ratio bandwidth and beamforming. Adjustments to these rectangular stubs allow for precise control of the antenna's polarization performance and radiation direction.

[0031] It should be noted that the two rectangular branches of this disclosure are staggered on both sides of the square groove, and in the first direction (i.e., parallel to the direction from the vertical end of the T-shaped branch to the horizontal end, that is...) Figure 1 In this antenna, two rectangular stubs are positioned above the T-shaped stub (located on the vertical axis of the dielectric substrate, pointing upwards). This ingenious arrangement allows the two rectangular stubs to function independently in their respective spatial dimensions, avoiding electromagnetic interference while maximizing the utilization of their individual electromagnetic properties. When one rectangular stub adjusts its axial ratio bandwidth, it does not affect the beam-controlling function of the other. Furthermore, by adjusting the rectangular stubs related to the axial ratio bandwidth, the polarization characteristics of the antenna's radiation field can be effectively altered, thereby widening the axial ratio bandwidth and ensuring good circular polarization performance over a wider frequency range. Simultaneously, by adjusting the rectangular stubs related to the beam, the directivity, width, and gain of the beam can be precisely controlled, achieving efficient signal coverage in specific areas. Thus, through the flexible adjustment of the two rectangular stubs, this circularly polarized antenna can adapt to complex and ever-changing communication environments and diverse application requirements, as detailed later.

[0032] In summary, the circularly polarized antenna of this disclosure uses a single-layer dielectric substrate. By cleverly arranging T-shaped stubs and two rectangular stubs associated with the axial ratio bandwidth and beamwidth respectively within a square slot, and by adjusting the two rectangular stubs to change the antenna's polarization characteristics and beam direction, flexible control of the axial ratio bandwidth and beamwidth can be achieved. Therefore, the technical solution provided by this disclosure, with its simple stub structure, achieves precise control of the axial ratio bandwidth and beamwidth, thus meeting the current demand for miniaturized repeaters and fulfilling practical needs.

[0033] The following section will focus on the two rectangular stubs in the circularly polarized antenna:

[0034] The two rectangular branches disclosed herein may include: a first rectangular branch and a second rectangular branch;

[0035] The size of the first rectangular stub is related to the axial ratio bandwidth, while the size of the second rectangular stub is related to the beam.

[0036] Specifically, appropriate rectangular stub dimensions enable the antenna to maintain good circular polarization performance over a wider frequency band, effectively broadening the axial ratio bandwidth. Therefore, the length, width, and other dimensional parameters of the first rectangular stub can be carefully designed and optimized. Adjusting these parameters alters the polarization characteristics of the antenna's radiation field, thus affecting the axial ratio bandwidth. Similarly, the dimensions of the second rectangular stub need precise setting. Its length, width, and relative position to other components determine the antenna beam's directivity, beamwidth, and gain characteristics. Reasonable adjustment of the second rectangular stub's dimensions allows for precise beam control to meet diverse communication needs.

[0037] The first rectangular branch and the T-shaped branch of this disclosure are spaced apart in the first direction.

[0038] Specifically, the size of this interval can be determined based on at least one factor such as the antenna's operating frequency and radiation characteristics, and is not limited here. Generally, it can be within a certain wavelength ratio range, for example, between 0.1 and 0.3 times the operating wavelength.

[0039] Furthermore, a suitable spacing can create appropriate electromagnetic coupling between the first rectangular stub and the T-shaped stub, ensuring effective control of the axial ratio bandwidth by the first rectangular stub while avoiding excessive electromagnetic interference between them, which would affect the overall performance of the antenna. That is, if the spacing is too small, the electromagnetic coupling may be too strong, causing significant interference from the T-shaped stub to the first rectangular stub's control of the axial ratio bandwidth; while if the spacing is too large, sufficient electromagnetic coupling may not be achieved, affecting the first rectangular stub's ability to adjust the axial ratio bandwidth. Therefore, through the ingenious design of a suitable spacing, the first rectangular stub can flexibly adjust the electromagnetic coupling effect, thereby achieving the goal of adjusting the axial ratio bandwidth.

[0040] The second rectangular branch of this disclosure is spaced apart from the first rectangular branch in a first direction, and the second rectangular branch is located above the first rectangular branch;

[0041] In the projection direction of the second direction, the projections of the first rectangular branch and the second rectangular branch do not overlap; wherein, the second direction is perpendicular to the first direction;

[0042] In the projection direction of the first direction, the projections of the first rectangular branch and the second rectangular branch do not overlap.

[0043] Specifically, there is a certain vertical distance between the second rectangular stub and the first rectangular stub (i.e., they are spaced apart in the first direction). This distance can also be optimized and determined according to the specific design requirements of the antenna. Generally, it is necessary to ensure that electromagnetic interference between the two can be effectively avoided while achieving reasonable electromagnetic interaction. The specific distance value is not limited here.

[0044] In the second direction (i.e., perpendicular to the first direction), the first and second rectangular stubs are configured to have non-overlapping projections. This is because if their projections overlapped in the second direction, the electromagnetic coupling effect between the stubs would become overly complex, making it difficult to precisely control the antenna's radiation characteristics and operating frequency band. By ensuring that their projections do not overlap, the electromagnetic interaction areas of the two stubs in that direction can be more clearly defined, thereby allowing for more effective optimization and adjustment of the antenna's performance. This ensures that the antenna can function stably under different operating scenarios, reducing unnecessary signal loss and interference.

[0045] In the first direction, the projections of the first rectangular stub and the second rectangular stub do not overlap and are spaced apart. This spacing in the first direction effectively reduces the near-field coupling strength between the stubs, preventing excessive coupling from causing significant changes in the antenna's input impedance and affecting the matching performance between the antenna and the feeding system. By reasonably adjusting the distance and positional relationship between the two in the first direction, good electromagnetic isolation and signal transmission can be achieved while maintaining a compact overall antenna structure. This improves the antenna's operating efficiency and stability, meeting the stringent performance requirements of different communication applications.

[0046] It should be noted that the first rectangular branch and the second rectangular branch of this disclosure can be interchanged, that is, the first rectangular branch is set on the first side of the square groove and the second rectangular branch is set on the second side of the square groove; or, the first rectangular branch is set on the second side of the square groove and the second rectangular branch is set on the first side of the square groove.

[0047] Specifically, this interchangeable configuration provides great flexibility in antenna design and tuning, allowing for free selection of the rectangular stub positions to achieve either left-hand or right-hand circular polarization. When communication equipment needs to be adapted to signal sources with different polarizations, the positions of the first and second rectangular stubs can be flexibly adjusted according to actual communication requirements. For example, in satellite communication, due to the complex and variable electromagnetic characteristics of the signal transmission direction between the satellite and the ground station, as well as the surrounding environment, this interchangeable configuration allows the ground station antenna to easily switch its circular polarization direction, ensuring a good match with the satellite signal, reducing signal transmission loss, and improving communication quality.

[0048] The first side of the first rectangular branch and the second side of the second rectangular branch are both parallel to the first direction; the third side of the first rectangular branch and the fourth side of the second rectangular branch are both perpendicular to the first direction.

[0049] Specifically, this parallel relationship ensures that the electromagnetic field distribution generated by the two rectangular stubs is consistent and regular in the first direction. When a signal is transmitted in the antenna, the first side of the first rectangular stub and the second side of the second rectangular stub are parallel to the first direction, making the propagation path of electromagnetic energy in that direction clearer and reducing unnecessary scattering and interference. At the same time, the third side of the first rectangular stub and the fourth side of the second rectangular stub are perpendicular to the first direction. This perpendicular relationship further optimizes the overall structure of the antenna, providing effective isolation and guidance for electromagnetic signals from different directions.

[0050] The T-shaped stub in the antenna structure of this disclosure will be explained in detail below:

[0051] The horizontal length of the T-shaped branch disclosed herein is greater than the vertical length of the T-shaped branch.

[0052] Specifically, this is because a longer horizontal end effectively increases the antenna's radiating area, allowing it to radiate a wider range of electromagnetic waves within a specific frequency band, thus enhancing signal coverage. Simultaneously, a relatively shorter vertical end helps optimize the antenna's input impedance, ensuring good matching between the antenna and the feed network and reducing reflection losses during signal transmission. This guarantees that the antenna can efficiently receive and transmit signals, meeting the signal strength and coverage requirements of different communication scenarios.

[0053] The size of the T-shaped stub in this disclosure is related to the radiation frequency.

[0054] Specifically, the length and width of the T-stub directly affect its resonant characteristics, thus determining the antenna's radiation frequency. When the T-stub's size increases, its resonant frequency decreases, allowing the antenna to radiate lower-frequency electromagnetic waves; conversely, if the T-stub's size decreases, the resonant frequency increases, allowing the antenna to radiate higher-frequency electromagnetic waves. By precisely adjusting the T-stub's dimensions, the antenna can operate at the desired specific frequency, meeting the application requirements of different communication frequency bands.

[0055] The dielectric substrate of this disclosure is illustrated below by way of example:

[0056] The dielectric substrate disclosed herein can be a printed circuit board (PCB).

[0057] Specifically, PCBs possess excellent electrical insulation properties, effectively isolating different conductive parts in a circuit and preventing crosstalk and short circuits, making them suitable for a wide range of applications in various communication fields. Furthermore, the high dimensional accuracy of PCBs allows for precise control of the antenna's physical structural parameters, thereby ensuring the consistency and stability of antenna performance.

[0058] The structure of the power supply port of this disclosure is described in detail below:

[0059] The power supply port disclosed herein is provided with an outer conductor and an inner conductor;

[0060] The outer conductor is connected to the ground plane of the PCB, and the inner conductor is connected to the T-shaped stub through a via.

[0061] Specifically, the outer conductor is connected to the PCB ground plane, providing a stable ground reference for the antenna and effectively reducing the impact of external electromagnetic interference on antenna performance. The inner conductor is connected to the T-shaped stub via vias. This connection method allows for precise transmission of RF signals to the T-shaped stub, thereby exciting the T-shaped stub to generate electromagnetic radiation. This is because vias can provide a low-impedance signal transmission path, reducing signal loss and distortion during transmission and ensuring signal integrity.

[0062] For example, Figure 2 This is a design flowchart for a circularly polarized antenna provided in an embodiment of this disclosure. From... Figure 2 It can be seen that traditional circularly polarized antennas, including square slots and T-shaped stubs, cannot meet the requirements of miniaturized repeater stations. Therefore, this disclosure allows for the addition of a rectangular stub to the left of the T-shaped stub to generate a wideband circularly polarized beam. Furthermore, adding a rectangular stub at the upper right corner of the square slot expands the axial ratio bandwidth. Thus, during the circular polarization design process, the antenna bandwidth can be increased without increasing the overall antenna size, achieving high versatility and good compatibility.

[0063] For example, Figure 3 Simulation results for beam adjustment of the circularly polarized antenna provided in the embodiments of this disclosure. Figure 4 Simulation results for the axial ratio bandwidth of the circularly polarized antenna provided in the embodiments of this disclosure. Figure 5 This disclosure provides a radiation simulation diagram of a circularly polarized antenna with dual polarization according to embodiments. The following will be combined with... Figures 3-5 The simulation of the entire antenna is illustrated by example:

[0064] refer to Figure 2 The values ​​of its antenna parameters are as follows:

[0065] L c =35mm, W c =35mm, L t =35mm, W t =35mm, L s1 =35mm, W s1 =35mm, L s2 =35mm, W s2 =35mm.

[0066] The above parameters are merely an exemplary description. In other possible embodiments, the bidirectional circularly polarized antenna provided in this embodiment may also select other parameters according to actual needs. This embodiment does not impose any restrictions on this.

[0067] To effectively demonstrate the simulation effect of the bidirectional circularly polarized antenna provided in this embodiment, please refer to... Figures 3-5 .from Figure 3 It can be seen that its return loss S11 ≤ -10dB, and therefore its beamforming operating frequency is 1.76GHz-3.15GHz, exhibiting a wide bandwidth effect. From Figure 4 It can be seen that its axial ratio bandwidth is 1.95GHz-2.73GHz, exhibiting a wide axial ratio bandwidth effect. From Figure 5 As can be seen, the bidirectional circularly polarized antenna provided in this embodiment has bidirectional radiation characteristics. Therefore, the bidirectional circularly polarized antenna provided in this embodiment has the advantages of miniaturization, low profile, and wide bandwidth, and radiates bidirectional circularly polarized signals, making it promising for application in miniaturized relay stations.

[0068] The basic principles of this disclosure have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this disclosure are merely examples and not limitations, and should not be considered as essential features of each embodiment of this disclosure. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the scope of this disclosure to the necessity of employing the aforementioned specific details for implementation.

[0069] The block diagrams of devices, apparatuses, devices, and systems disclosed herein are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, devices, and systems can be connected, arranged, and configured in any manner. Words such as “comprising,” “including,” “having,” etc., are open-ended terms meaning “including but not limited to,” and are used interchangeably with them. The terms “or” and “and” as used herein refer to the terms “and / or,” and are used interchangeably with them unless the context clearly indicates otherwise. The term “such as” as used herein refers to the phrase “such as but not limited to,” and is used interchangeably with it.

[0070] Additionally, as used herein, the “or” used in a list of items beginning with “at least one” indicates a separate list, such that a list of, for example, “at least one of A, B, or C” means A or B or C, or AB or AC or BC, or ABC (i.e., A and B and C). Furthermore, the word “exemplary” does not imply that the described example is preferred or better than other examples.

[0071] It should also be noted that in the systems and methods of this disclosure, the components or steps can be decomposed and / or recombined. These decompositions and / or recombinations should be considered as equivalent solutions to this disclosure.

[0072] Various changes, substitutions, and modifications can be made to the technology described herein without departing from the teachings defined by the appended claims. Furthermore, the scope of the claims of this disclosure is not limited to the specific aspects of the processes, machines, manufactures, events, means, methods, and actions described above. Currently existing or later-developed processes, machines, manufactures, events, means, methods, or actions that perform substantially the same function or achieve substantially the same result as the corresponding aspects described herein can be utilized. Therefore, the appended claims include such processes, machines, manufactures, events, means, methods, or actions within their scope.

[0073] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use this disclosure. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects without departing from the scope of this disclosure. Therefore, this disclosure is not intended to be limited to the aspects shown herein, but rather to be carried out within the widest scope consistent with the principles and novel features disclosed herein.

[0074] The above description has been given for purposes of illustration and description. Furthermore, this description is not intended to limit the embodiments of this disclosure to the forms disclosed herein. Although numerous exemplary aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations therein.

Claims

1. A circularly polarized antenna, characterized in that, The antenna uses a single-layer dielectric substrate, and the dielectric substrate is provided with a square slot; a feed port is provided in the square slot; the feed port is connected to a T-shaped branch for power saving; The dielectric substrate includes two rectangular branches extending into the square groove, the two rectangular branches being staggered on both sides of the square groove; In a first direction, the two rectangular branches are positioned above the T-shaped branch; the first direction is parallel to the direction from the vertical end of the T-shaped branch to the horizontal end. The two rectangular stubs are related to the axial ratio bandwidth and beamwidth.

2. The antenna according to claim 1, characterized in that, The two rectangular branches include: a first rectangular branch and a second rectangular branch; The size of the first rectangular stub is related to the axial ratio bandwidth, and the size of the second rectangular stub is related to the beam.

3. The antenna according to claim 2, characterized in that, The first rectangular branch and the T-shaped branch are spaced apart in the first direction.

4. The antenna according to claim 2, characterized in that, The second rectangular branch and the first rectangular branch are spaced apart in the first direction, and the second rectangular branch is located on top of the first rectangular branch; In the projection direction of the second direction, the projections of the first rectangular branch and the second rectangular branch do not overlap; wherein, the second direction is perpendicular to the first direction; In the projection direction of the first direction, the projections of the first rectangular branch and the second rectangular branch do not overlap.

5. The antenna according to claim 2, characterized in that, The first rectangular branch is disposed on the first side of the square groove, and the second rectangular branch is disposed on the second side of the square groove; or, the first rectangular branch is disposed on the second side of the square groove, and the second rectangular branch is disposed on the first side of the square groove.

6. The antenna according to claim 2, characterized in that, The first side of the first rectangular branch and the second side of the second rectangular branch are both parallel to the first direction; The third side of the first rectangular branch and the fourth side of the second rectangular branch are both perpendicular to the first direction.

7. The antenna according to claim 1, characterized in that, The horizontal length of the T-shaped branch is greater than the vertical length of the T-shaped branch.

8. The antenna according to claim 1, characterized in that, The size of the T-shaped branch is related to the radiation frequency.

9. The antenna according to claim 1, characterized in that, The dielectric substrate is a printed circuit board (PCB).

10. The antenna according to claim 1, characterized in that, The power supply port is provided with an outer conductor and an inner conductor; The outer conductor is connected to the ground plane of the PCB, and the inner conductor is connected to the T-shaped stub through a via.

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