Circularly polarized antenna
Through the compact double-layer structure and perturbation unit design, combined with the radiation patch and perturbation units of different dielectric substrates, the polarization characteristics and volume problems of dual-band double-circular polarization antenna are solved, and the miniaturization and efficient circular polarization performance are achieved.
Patent Information
- Application Number
- CN202422339406.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-25
- Publication Date
- 2025-07-11
- Estimated Expiration
- 2034-09-25
AI Technical Summary
The existing dual-frequency double-circular polarization antennas cannot have good left-hand circular polarization characteristics and right-hand circular polarization characteristics at the same time, and have a large overall size and large space occupancy.
Using a compact two-layer structure design, the vertical arrangement of the perturbation unit is achieved by setting different perturbation units and single-feed probes, combining radiation patches and perturbation units on the first and second dielectric substrates, a rectangular or circular perturbation unit is adopted to simplify production, and a second dielectric substrate with a lower dielectric constant is used to optimize the frequency ratio, and the left-hand and right-hand circular polarization characteristics are achieved.
The antenna is miniaturized, and has good left-hand and right-hand circular polarization characteristics, which expands the bandwidth and maintains good performance in each frequency band, and improves the compactness and radiation capacity of the overall structure.
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Figure CN223093118U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of antennas, and particularly relates to a circularly polarized antenna. Background Art
[0002] With the rapid development of modern electronic information technology and the increasing expansion of the application scenarios of radio equipment, the system integration degree is getting higher and higher, and the broadband and multi-polarization of antennas have become the research hotspots in the domestic and foreign antenna fields. Compared with linearly polarized antennas, circularly polarized antennas have many advantages: they can receive incoming waves from any direction, and their radiated waves can also be received by any polarized antenna.
[0003] In the prior art, when designing an antenna, it is also required that the antenna has the characteristics of dual operating frequency bands, dual circular polarization, and transceiver integration to meet the requirements of miniaturization, transceiver duplex, frequency reuse, etc. of the communication system. Therefore, the dual-frequency dual-circularly polarized antenna has also become an important type of antenna among existing antennas.
[0004] However, the dual-frequency dual-circularly polarized antenna still has the following problems. Since the polarization and operating frequency of the transceiver antennas are different, the transceiver antennas are generally dual-port double-layer antennas or two separate low-frequency and high-frequency antennas, and generally adopt a dual-feed design, which requires an additional power divider phase shifter or a feeding network. Therefore, the existing dual-frequency dual-circularly polarized antenna has the problem that it cannot simultaneously have good left-handed circular polarization characteristics and right-handed circular polarization characteristics, and there is also the problem that the overall volume of the dual-frequency dual-circularly polarized antenna is relatively large and it occupies a large space. Summary of the Utility Model
[0005] In order to solve the above problems, the utility model provides a circularly polarized antenna. Through a compact double-layer structure, different perturbation units are provided and a single-feed probe design is adopted, so that while having good left-handed circular polarization characteristics and right-handed circular polarization characteristics, the antenna design is compact and further miniaturized.
[0006] The purpose of the utility model is realized through the following technical solutions:
[0007] In a first aspect, the utility model provides a circularly polarized antenna, comprising:
[0008] A first dielectric substrate, on the upper surface of which a first radiation patch is provided, the first radiation patch is provided with a first perturbation unit and a feeding point; the first dielectric substrate is provided with a first drilling;
[0009] A second dielectric substrate, on the upper surface of which a second radiation patch is provided, the second radiation patch is provided with a second perturbation unit and a second drilling; the second dielectric substrate is provided with a third drilling; and
[0010] The feeding probe, one end of the feeding probe passes through the third drilling hole, the second drilling hole, and the first drilling hole and is connected to the feeding point, and the other end of the feeding probe is electrically connected to the grounding end.
[0011] Wherein, the first dielectric substrate is disposed above the second dielectric substrate, and the first perturbation unit and the second perturbation unit are perpendicular to each other.
[0012] By providing a first dielectric substrate, the upper surface is provided with a first radiation patch, the first radiation patch is provided with a first perturbation unit and a feeding point; the first dielectric substrate is provided with a first drilling hole; a second dielectric substrate, the upper surface is provided with a second radiation patch, the second radiation patch is provided with a second perturbation unit and a second drilling hole; the second dielectric substrate is provided with a third drilling hole; and a feeding probe, one end of the feeding probe passes through the first drilling hole, the second drilling hole, and the third drilling hole and is connected to the feeding point, the other end of the feeding probe is electrically connected to the grounding end, and the first substrate is disposed above the second substrate, and the overall structure is made compact through this structure; further, a first perturbation unit is provided on the first radiation patch, a second perturbation unit is provided on the second radiation patch, and the first perturbation unit and the second perturbation unit are perpendicular to each other to achieve low-frequency right-handed circular polarization and high-frequency left-handed circular polarization.
[0013] In some embodiments, the first radiation patch and the second radiation patch are circular.
[0014] By setting the first radiation patch and the second radiation patch to be circular, the ability of the first radiation patch and the second radiation patch to receive radiation waves in any direction can be improved, and the ability of their radiation waves to be received by any polarized antenna can also be improved.
[0015] In some embodiments, there are two first perturbation units, the two first perturbation units are disposed at the circumference of the first radiation patch, and the first central axes of the two first perturbation units coincide and are on the same diameter of the first radiation patch; there are two second perturbation units, the two second perturbation units are disposed at the circumference of the second radiation patch, and the second central axes of the two second perturbation units coincide and are on the same diameter of the second radiation patch; the first central axis and the second central axis are perpendicular to each other.
[0016] With two first perturbation units, and disposed on the circumference of the first radiation patch, and the first central axes of the two first perturbation units are disposed on the same diameter of the first radiation patch; with two second perturbation units, and disposed on the circumference of the second radiation patch, and the second central axes of the two second perturbation units are disposed on the same diameter of the second radiation patch. By the first central axis and the second central axis being perpendicular to each other, the first perturbation unit and the second perturbation unit are relatively perpendicular in a top view, so that the surface current phases of the first radiation patch and the second radiation patch are changed, achieving low-frequency right-handed circular polarization and high-frequency left-handed circular polarization.
[0017] In some embodiments, both the first perturbation unit and the second perturbation unit are rectangular.
[0018] The first perturbation unit and the second perturbation unit with a rectangular design are more convenient in production and design. By using a rectangular slot with a simple structure, two radiation patches can respectively achieve low-frequency right-handed circular polarization and high-frequency left-handed circular polarization.
[0019] In some embodiments, the sizes of the first dielectric substrate and the second dielectric substrate are rectangular, with side lengths of 6 mm to 7 mm and a thickness of 0.4 mm to 0.5 mm.
[0020] The sizes of the first dielectric substrate and the second dielectric substrate should be the minimum sizes required for installing the radiation patches that satisfy low-frequency right-handed circular polarization and high-frequency left-handed circular polarization. Also, the thickness should be such that the thickness of the dielectric substrate is relatively thin while not affecting the radiation wavelength, so as to improve the compactness of the entire antenna structure.
[0021] In some embodiments, the radii of the first radiation patch and the second radiation patch are 3 mm to 5 mm, and the thickness is 0.03 to 0.04 mm, and the radius of the first radiation patch is less than the radius of the second radiation patch.
[0022] The radii of the first radiation patch and the second radiation patch should satisfy low-frequency right-handed circular polarization and high-frequency left-handed circular polarization, and the thickness of the radiation patch should be relatively thin to improve the compactness of the entire antenna structure.
[0023] In some embodiments, the second drill hole is a circular via.
[0024] The circular via on the second radiation patch is usually set to be larger than the feeding probe to ensure that the circular via can just allow the feeding probe to pass through. At the same time, it can also enable the second radiation patch to be coupled for feeding.
[0025] In some embodiments, the dielectric constant of the second dielectric substrate is less than the dielectric constant of the first dielectric substrate.
[0026] By arranging the second dielectric substrate with a smaller dielectric constant under the first dielectric substrate, a smaller frequency ratio of the high and low frequency centers can be achieved.
[0027] In some embodiments, the impedance on the central axis of the feeding point is 50 Ω.
[0028] In some embodiments, the grounding end of the feeding probe is a metal ground patch or a grounding port.
[0029] The beneficial effects of a circularly polarized antenna of the present utility model are:
[0030] By providing a first dielectric substrate with a first radiation patch on its upper surface, the first radiation patch is provided with a first perturbation unit and a feeding point; the first dielectric substrate is provided with a first drilled hole; a second dielectric substrate, with a second radiation patch on its upper surface, the second radiation patch is provided with a second perturbation unit and a second drilled hole; the second dielectric substrate is provided with a third drilled hole; and a feeding probe, one end of the feeding probe passes through the first drilled hole, the second drilled hole, and the third drilled hole and is connected to the feeding point, the other end of the feeding probe is electrically connected to the ground end, and the first substrate is arranged above the second substrate, achieving a compact overall structure through this structure; further, a first perturbation unit is provided on the first radiation patch, a second perturbation unit is provided on the second radiation patch, and the first perturbation unit and the second perturbation unit are perpendicular to each other to achieve the left-handed circular polarization characteristic and the right-handed circular polarization of the antenna. Description of the Drawings
[0031] Figure 1 Exploded view of the structure of a circularly polarized antenna according to the present invention;
[0032] Figure 2 Cross-sectional view of a circularly polarized antenna according to the present invention;
[0033] Figure 3 Front view of the first radiation patch and the second radiation patch of a circularly polarized antenna according to the present invention;
[0034] Figure 4 S-parameter curve graph of a circularly polarized antenna according to the present invention;
[0035] Figure 5 Axial ratio characteristic curve graph of a circularly polarized antenna according to the present invention;
[0036] Figure 6 Radiation characteristic curve of the low-frequency center frequency point of a circularly polarized antenna according to the present invention Figure 1 ;
[0037] Figure 7 Radiation characteristic curve of the low-frequency center frequency point of a circularly polarized antenna according to the present invention Figure 2 ;
[0038] Figure 8 Radiation characteristic curve of the high-frequency center frequency point of a circularly polarized antenna according to the present invention Figure 1 ;
[0039] Figure 9 Radiation characteristic curve of the high-frequency center frequency point of a circularly polarized antenna according to the present invention Figure 2 .
[0040] Reference Signs:
[0041] 100, First dielectric substrate; 110, First drill hole;
[0042] 200, First radiation patch; 210, First perturbation unit; 211, First central axis; 220, Feed point;
[0043] 300, Second dielectric substrate; 310, Third drill hole;
[0044] 400, Second radiation patch; 410, Second perturbation unit; 411, Second central axis; 420, Second drill hole;
[0045] 500, Feed probe;
[0046] 600, Ground patch; 610, Ground port. Detailed implementation mode
[0047] It should be noted that, without conflict, the embodiments in the present utility model and the technical features in the embodiments can be combined with each other. The detailed description in the specific implementation mode should be understood as an explanatory illustration of the purpose of the present utility model and should not be regarded as an improper limitation of the present utility model.
[0048] To make the purpose, technical solutions and advantages of the embodiments of the present utility model clearer, the following will further describe the specific technical solutions of the present utility model in detail with reference to the drawings in the embodiments of the present utility model. The following embodiments are used to illustrate the present utility model but are not used to limit the scope of the present utility model.
[0049] In the embodiments of the present utility model, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the embodiments of the present utility model, unless otherwise specified, the meaning of "a plurality" is two or more.
[0050] In addition, in the embodiments of the present utility model, the orientation terms such as "upper", "lower", "left" and "right" are defined relative to the orientation of the components shown in the drawings. It should be understood that these directional terms are relative concepts, and they are used for relative description and clarification, and they may change correspondingly according to the change of the orientation of the components placed in the drawings.
[0051] In the embodiments of the present utility model, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or integrated; it can be directly connected or indirectly connected through an intermediate medium.
[0052] In the embodiments of the present utility model, the terms "comprise", "include" or any other variant thereof are intended to cover non-exclusive inclusion. Without further limitation, an element defined by the statement "comprising an..." does not exclude the existence of additional identical elements in the process, method, article or device comprising the element.
[0053] In the embodiments of the present utility model, words such as "exemplary" or "for example" are used to represent examples, illustrations or explanations. Any embodiment or design solution described as "exemplary" or "for example" in the embodiments of the present utility model should not be construed as being more preferred or having more advantages than other embodiments or design solutions. Rather, the use of words such as "exemplary" or "for example" is intended to present the relevant in a specific manner.
[0054] Embodiment 1:
[0055] As Figure 1 shown, this embodiment provides a circularly polarized antenna, comprising:
[0056] A first dielectric substrate 100, on the upper surface of which a first radiation patch 200 is provided, the first radiation patch 200 is provided with a first perturbation unit 210 and a feeding point 220; the first dielectric substrate 100 is provided with a first drilling 110;
[0057] A second dielectric substrate 300, on the upper surface of which a second radiation patch 400 is provided, the second radiation patch 400 is provided with a second perturbation unit 410 and a second drilling 420; the second dielectric substrate 300 is provided with a third drilling 310; and
[0058] A feeding probe 500, one end of the feeding probe 500 passes through the third drilling 310, the second drilling 420 and the first drilling 110 and is connected to the feeding point 220, and the other end of the feeding probe 500 is electrically connected to the ground end.
[0059] Wherein, the first dielectric substrate 100 is disposed above the second dielectric substrate 300, and the first perturbation unit 210 and the second perturbation unit 410 are perpendicular to each other.
[0060] Specifically, the first dielectric substrate 100 covers the second dielectric substrate 300. The first radiation patch 200 is disposed above the second radiation patch 400, and the second radiation patch 400 is disposed between the first dielectric substrate 100 and the second dielectric substrate 300. The third drilling 310, the second drilling 420, and the first drilling 110 are correspondingly arranged so that the feeding probe 500 extends through the third drilling 310, the second drilling 420, and the first drilling 110 to the feeding point 220, enabling the first radiation patch 200 to be directly fed, while the second radiation patch 400 is coupled-fed. Further, the first radiation patch 200 and the second radiation patch 400 have different sizes to change the radiation frequency bands of the two radiation patches, so as to achieve the output and reception of different frequency bands of high and low frequencies. At the same time, the coupled feeding of the second radiation patch 400 increases the resonance points by introducing parasitic patch units, and uses a similar staggered tuning method to make it located near the original resonance frequency, thereby effectively expanding the bandwidth. At the same time, further, a multi-band design can be adopted. This method uses an antenna that can cover multiple adjacent frequency bands simultaneously, so as to achieve good performance in different frequency bands, and the frequency ratio between multiple frequency bands can be made small by setting the size ratio, effectively expanding the bandwidth. A first perturbation unit 210 is disposed on the first radiation patch 200, and a second perturbation unit 410 is disposed on the second radiation patch 400. The first perturbation unit 210 and the second perturbation unit 410 are perpendicular to each other, enabling the antenna to achieve low-frequency right-handed circular polarization and high-frequency left-handed circular polarization respectively.
[0061] The beneficial effect of this embodiment is that by providing the first dielectric substrate 100, the upper surface is provided with the first radiation patch 200, and the first radiation patch 200 is provided with the first perturbation unit 210 and the feeding point 220; the first dielectric substrate 100 is provided with the first drilling 110; the second dielectric substrate 300, the upper surface is provided with the second radiation patch 400, and the second radiation patch 400 is provided with the second perturbation unit 410 and the second drilling 420; the second dielectric substrate 300 is provided with the third drilling 310; and the feeding probe 500, one end of the feeding probe 500 passes through the first drilling 110, the second drilling 420, and the third drilling 310 and is connected to the feeding point 220, the other end of the feeding probe 500 is electrically connected to the ground end, and the first substrate is disposed above the second substrate, achieving a compact overall structure through this structure; further, the first radiation patch 200 is provided with the first perturbation unit 210, the second radiation patch 400 is provided with the second perturbation unit 410, and the first perturbation unit 210 and the second perturbation unit 410 are perpendicular to each other to achieve the left-handed circular polarization characteristic and right-handed circular polarization of the antenna.
[0062] Embodiment 2:
[0063] Such as Figures 1 to 3As shown in the figure, this embodiment is based on Embodiment 1 and further illustrates and optimizes the structure proposed in Embodiment 1.
[0064] In some embodiments, the first radiation patch 200 and the second radiation patch 400 are circular.
[0065] Specifically, the first radiation patch 200 and the second radiation patch 400 are set to be circular, and can also be set to be oval or rectangular. The beneficial effect of this method is that by setting it to be circular, the ability to receive radiation waves in any direction and the ability that its radiation waves can also be received by any polarized antenna can be improved.
[0066] In some embodiments, there are two first perturbation units 210, and the two first perturbation units 210 are arranged at the circumference of the first radiation patch 200, and the first central axes 211 of the two first perturbation units 210 coincide and are on the same diameter of the first radiation patch 200; there are two second perturbation units 410, and the two second perturbation units 410 are arranged at the circumference of the second radiation patch 400, and the second central axes 411 of the two second perturbation units 410 coincide and are on the same diameter of the second radiation patch 400; the first central axis 211 and the second central axis 411 are perpendicular to each other.
[0067] Specifically, in some preferred embodiments, there are two first perturbation units 210 and two second perturbation units 410, and the two perturbation units are arranged at diagonal positions. If the first radiation patch 200 is circular, the first central axes 211 of the two first perturbation units 210 are arranged on the same diameter. At the same time, if the second radiation patch 400 is circular, the second central axes 411 of the two second perturbation units 410 are arranged on the same diameter. From a top view perspective, the first central axis 211 and the second central axis 411 are perpendicular to each other, so that the surface current phase is changed and the phase difference of the current is 90°, meeting the conditions required for circularly polarized waves, thereby realizing low-frequency right-handed circular polarization and high-frequency left-handed circular polarization. In some other embodiments, both the first radiation patch 200 and the second radiation patch 400 are square, and the two perturbation units are respectively arranged in the middle of the opposite sides or at the diagonals, so that when the first radiation patch 200 and the second radiation patch 400 are arranged, the first central axis 211 of the first radiation patch 200 and the second central axis 411 of the second radiation patch 400 are perpendicular to each other. In some other embodiments, the first radiation patch 200 and the second radiation patch 400 are oval. In the case of having two first perturbation units 210 and two second perturbation units 410, the two first perturbation units 210 can be arranged at the long axis, and the second perturbation unit 410 can be arranged at the short axis to achieve a 90° phase difference between the perturbation units.
[0068] The beneficial effects of this embodiment are as follows. There are two first perturbation units 210, which are arranged on the circumference of the first radiation patch 200, and the first central axes 211 of the two first perturbation units 210 are arranged on the diameter of the same first radiation patch 200. There are two second perturbation units 410, which are arranged on the circumference of the second radiation patch 400, and the second central axes 411 of the two second perturbation units 410 are arranged on the diameter of the same second radiation patch 400. Since the first central axis 211 and the second central axis 411 are perpendicular to each other, the first perturbation unit 210 and the second perturbation unit 410 are relatively perpendicular in the top view, so that the surface current phases of the first radiation patch 200 and the second radiation patch 400 are changed, realizing low-frequency right-handed circular polarization and high-frequency left-handed circular polarization.
[0069] In some embodiments, both the first perturbation unit 210 and the second perturbation unit 410 are rectangular.
[0070] Specifically, both the first perturbation unit 210 and the second perturbation unit 410 can be set to be rectangular, or circular, or triangular, or other polygons. In actual applications, setting them to be rectangular can facilitate mold opening and production, and further improve production efficiency.
[0071] The first perturbation unit 210 and the second perturbation unit 410 designed as rectangles are more convenient in production and design. With simple rectangular slots, the two radiation patches can respectively achieve low-frequency right-handed circular polarization and high-frequency left-handed circular polarization.
[0072] In some embodiments, the sizes of the first dielectric substrate 100 and the second dielectric substrate 300 are rectangular, with side lengths of 6 mm to 7 mm and a thickness of 0.4 mm to 0.5 mm.
[0073] Specifically, the sizes of the first dielectric substrate 100 and the second dielectric substrate 300 are rectangular, with the rectangular side lengths in the range of 6 mm to 7 mm, and the thicknesses of the first dielectric substrate 100 and the second dielectric substrate 300 are different. The thickness of the second dielectric substrate 300 is relatively thinner than that of the first dielectric substrate 100, but both are in the range of 0.4 mm to 0.5 mm. The beneficial effect of this method is that the sizes of the first dielectric substrate 100 and the second dielectric substrate 300 should be the minimum sizes when installing the radiation patches that meet low-frequency right-handed circular polarization and high-frequency left-handed circular polarization, and the thickness should also be the thinnest thickness while not affecting the radiation wavelength, so as to improve the compactness of the entire antenna structure.
[0074] In some embodiments, the radii of the first radiation patch 200 and the second radiation patch 400 are 3 mm to 5 mm, the thickness is 0.03 to 0.04 mm, and the radius of the first radiation patch 200 is less than the radius of the second radiation patch 400.
[0075] Specifically, in actual design, high-frequency left-handed circular polarization is generally realized by the first radiation patch 200, while low-frequency right-handed circular polarization is generally realized by the second radiation patch 400, and the first radiation patch 200 is smaller than the second radiation patch 400. The beneficial effect of this method is that the radii of the first radiation patch 200 and the second radiation patch 400 should satisfy low-frequency right-handed circular polarization and high-frequency left-handed circular polarization, and the thickness should be as thin as possible to improve the compactness of the entire antenna structure.
[0076] In some embodiments, the second drill hole 420 is a circular via hole.
[0077] Specifically, the size of the circular via hole is matched with the size of the feeding probe 500, so that the feeding probe 500 can be connected to the second radiation patch 400. The beneficial effect of this method is that the circular via hole on the second radiation patch 400 is usually set larger than the feeding probe 500 to ensure that the feeding probe 500 can just pass through the circular via hole, and at the same time, it can also make the second radiation patch 400 coupled for feeding.
[0078] In some embodiments, the dielectric constant of the second dielectric substrate 300 is less than the dielectric constant of the first dielectric substrate 100.
[0079] Specifically, when the antenna operates in the K band, the frequency ratio of the high-frequency and low-frequency center frequencies is 23.4 / 22.4 = 1.04, which is a relatively small frequency ratio. This also results in the sizes of the upper and lower radiation patches being very close. The second radiation patch 400 is too small to provide the function of a metal ground for the upper radiation patch. Only by using a second dielectric substrate 300 with a lower dielectric constant and a first dielectric substrate 100 with a higher dielectric constant can it be ensured that the upper patch has a sufficiently large metal ground. The beneficial effect of this method is that by setting the second dielectric substrate 300 with a smaller dielectric constant under the first dielectric substrate 100, a smaller frequency ratio of the high-frequency and low-frequency center frequencies can be achieved.
[0080] In some embodiments, the impedance on the central axis of the feeding point 220 is 50 Ω. That is, the impedance on the central axis of the feeding point 220 is 50 Ω, and this method can be detected by conventional impedance methods.
[0081] In some embodiments, the grounding end of the feeding probe 500 is a metal ground patch and is attached to the side of the second dielectric substrate 300 away from the second radiation patch 400, or is a grounding port 610, which is set on the second dielectric substrate 300 away from the second radiation patch 400, and the central axis of the grounding port 610 is on the central axis of the feeding probe 500.
[0082] Embodiment 3:
[0083] This embodiment conducts radiation tests on a circularly polarized antenna proposed in Embodiment 1 and Embodiment 2 to prove that while the antenna meets the basic radiation function of the antenna, it has right-handed circular polarization at low frequencies and left-handed circular polarization at high frequencies.
[0084] As Figure 4 shown, this figure shows the side view of its radiation performance. In the figure, S11 is less than -10 dB, that is, the impedance bandwidth with good antenna performance is 2.77 GHz, and the relative bandwidth is 12.14%. Therefore, the bandwidth of this antenna is better than that of general microstrip patch antennas, and it has good impedance bandwidth characteristics.
[0085] As Figure 5 shown, this figure shows the axial ratio characteristic curve of the small frequency ratio dual-frequency dual-circularly polarized antenna of this embodiment in the K band. It can be seen from the figure that the 6 dB axial ratio bandwidth of the high and low frequencies of this antenna is 0.4 GHz, and the relative bandwidth is 1.7%.
[0086] As Figures 6 to 7 shown, it can be seen that the maximum gain of this antenna at the low-frequency center frequency point is 7.43 dBi. And in the figure of the low-frequency point, the dotted line is right-handed circular polarization, and the solid line is left-handed circular polarization. And the dotted line is higher than the solid line in the normal frequency band, which indicates that this antenna has good right-handed circular polarization characteristics in the low-frequency state;
[0087] As Figures 8 to 9 shown, this is the radiation characteristic curve of the small frequency ratio dual-frequency dual-circularly polarized antenna of this embodiment at the high-frequency center frequency point in the K band. It can be seen from the figure that the maximum gain of this antenna at the high-frequency center frequency point is 7.06 dBi. The dotted line is right-handed circular polarization, and the solid line is left-handed circular polarization. And the solid line is higher than the dotted line in the normal frequency band, which indicates that it has good left-handed circular polarization characteristics in the high-frequency state.
[0088] The serial numbers of the utility model embodiments are only for description and do not represent the advantages or disadvantages of the embodiments. The above are only the preferred embodiments of the present utility model, and do not limit the patent scope of the present utility model accordingly. Any equivalent device or equivalent process transformation made by using the content of the specification and drawings of the present utility model, or directly or indirectly applied in other related technical fields, shall be included in the patent protection scope of the present utility model by the same token.
Claims
1. A circularly polarized antenna, characterized in that, Comprising: A first dielectric substrate (100) with a first radiation patch (200) disposed on its upper surface. The first radiation patch (200) is provided with a first perturbation unit (210) and a feeding point (220); the first dielectric substrate (100) is provided with a first drilling hole (110). A second dielectric substrate (300) with a second radiation patch (400) disposed on its upper surface. The second radiation patch (400) is provided with a second perturbation unit (410) and a second drilling hole (420); the second dielectric substrate (300) is provided with a third drilling hole (310); and A feeding probe (500), one end of the feeding probe (500) passes through the third drilling hole (310), the second drilling hole (420), and the first drilling hole (110) and is connected to the feeding point (220), and the other end of the feeding probe (500) is electrically connected to a ground terminal. Wherein, the first dielectric substrate (100) is disposed above the second dielectric substrate (300), and the first perturbation unit (210) and the second perturbation unit (410) are perpendicular to each other.
2. The circularly polarized antenna according to claim 1, characterized in that, The first radiation patch (200) and the second radiation patch (400) are circular.
3. The circularly polarized antenna according to claim 2, wherein, There are two first perturbation units (210), and the two first perturbation units (210) are disposed at the circumference of the first radiation patch (200), and the first central axes (211) of the two first perturbation units (210) coincide and are on the same diameter of the first radiation patch (200); there are two second perturbation units (410), and the two second perturbation units (410) are disposed at the circumference of the second radiation patch (400), and the second central axes (411) of the two second perturbation units (410) coincide and are on the same diameter of the second radiation patch (400); the first central axis (211) and the second central axis (411) are perpendicular to each other.
4. The circularly polarized antenna according to claim 3, wherein Both the first perturbation unit (210) and the second perturbation unit (410) are rectangular.
5. The circularly polarized antenna according to claim 4, wherein The sizes of the first dielectric substrate (100) and the second dielectric substrate (300) are rectangular, with side lengths of 6 mm to 7 mm and thicknesses of 0.4 mm to 0.5 mm.
6. The circularly polarized antenna according to claim 5, wherein The radii of the first radiation patch (200) and the second radiation patch (400) are 3 mm to 5 mm, and the thicknesses are 0.03 to 0.04 mm, and the radius of the first radiation patch (200) is smaller than the radius of the second radiation patch (400).
7. The circularly polarized antenna according to claim 1, wherein The second drilling hole (420) is a circular via hole.
8. The circularly polarized antenna according to claim 1, wherein The dielectric constant of the second dielectric substrate (300) is smaller than the dielectric constant of the first dielectric substrate (100).
9. The circularly polarized antenna according to claim 1, wherein The impedance on the central axis of the feeding point (220) is 50 Ω.
10. The circularly polarized antenna according to claim 1, wherein The ground terminal of the feeding probe (500) is a metal ground patch or a ground port (610).