Monomer coplanar circularly polarized dual-frequency antenna

Abstract

The utility model provides a monomer coplanar circularly polarized dual-frequency antenna, which comprises an upper-layer radiation electrode, a dielectric substrate, a lower-layer radiation electrode, a reflecting layer and a feed point needle, and is characterized in that the upper-layer radiation electrode and the lower-layer radiation electrode are respectively mounted on the upper surface and the lower surface of the dielectric substrate; the feed point needle is fixed in the dielectric substrate and is electrically connected with the upper-layer radiation electrode and the lower-layer radiation electrode in an electromagnetic coupling mode, and the upper-layer radiation electrode comprises a first frequency band radiation electrode and a second frequency band radiation electrode which are detachable; a gap of a geometric symmetry structure is arranged between the first frequency band radiation electrode and the second frequency band radiation electrode, and the bottom of the feed point needle is connected with the reflecting layer. The dual-frequency circularly polarized antenna solves the problems of poor circularly polarized radiation performance, low electrical index, low integration level, heavy weight, poor process adaptability, low reliability, limited working temperature and the like of the dual-frequency circularly polarized antenna in the prior art.

Description

TECHNICAL FIELD

[0001] The utility model relates to antenna technical field and particularly relates to a single monomer coplanar circularly polarized dual -frequency antenna. BACKGROUND

[0002] In global positioning system (GPS), antenna is the key component for receiving satellite signal and transmitting to receiver for processing, and its working frequency plays a decisive role in system performance and positioning accuracy. GPS system uses L band frequency, mainly including L1 (1575.42MHz), L2 (1227.60MHz) and L5 (1176.45MHz) three frequency bands. Among them, L1 frequency band is the main frequency band for providing position, speed and time information; L2 frequency band focuses on providing more accurate measurement data and atmospheric interference correction; L5 frequency band is committed to providing higher precision positioning information, and has stronger anti-interference ability. These frequency bands have wide application in many fields such as car navigation, logistics management and military.

[0003] At present, dual -frequency circularly polarized antenna focuses on receiving L1 and L5 frequency band signal, however, there are generally problems of poor circularly polarized radiation performance, low circularly polarized electrical index and low integration. These deficiencies make it difficult to meet the growing demand for high-precision positioning.

[0004] At the same time, communication technology is in a period of rapid development, and higher requirements are put forward for the performance of antenna. When realizing dual -frequency function, many disadvantages of traditional laminated antenna structure gradually appear. The multi-layer structure makes the antenna weight larger, which is contrary to the development trend of modern equipment pursuing light weight; traditional laminated antenna can only adapt to specific process, and the application scene is greatly limited. In addition, the feed point needle and the radiation electrode are connected by welding, and the process is complicated, and the feed point needle is frequently pushed out and falls off due to external force, and the working temperature of the antenna is limited within 220 DEG C.

[0005] In summary, it is of great practical significance to develop a new type of antenna which takes into account good circularly polarized performance, high integration, and overcomes the defects of traditional laminated antenna such as high cost, heavy weight and poor process adaptability, to promote the development of GPS technology and related application fields. UTILITY MODEL CONTENT

[0006] In order to solve the above technical problems, the application provides a single monomer coplanar circularly polarized dual -frequency antenna.

[0007] The utility model provides a kind of single body coplanar circular polarization dual-frequency antenna, the antenna includes upper layer radiation electrode, dielectric matrix, lower layer radiation electrode, reflecting layer and feed point needle, the upper and lower surfaces of dielectric matrix are respectively equipped with upper layer radiation electrode and lower layer radiation electrode, feed point needle is fixed in dielectric matrix and is electrically connected with upper layer radiation electrode and lower layer radiation electrode by electromagnetic coupling mode, upper layer radiation electrode includes detachable first frequency band radiation electrode and second frequency band radiation electrode, first frequency band radiation electrode and second frequency band radiation electrode are provided with gap of geometric symmetry structure, the bottom of feed point needle is connected with reflecting layer.

[0008] In the above technical scheme, by splitting the upper layer radiation electrode into detachable first frequency band radiation electrode and second frequency band radiation electrode, combined with the geometric symmetry gap between them, dual-band signal radiation can be achieved, meeting the dual-frequency operation requirement. The electromagnetic coupling electrical connection method is used for the feed point needle and the upper and lower layer radiation electrodes, which avoids many problems caused by traditional welding connection, such as poor reliability of welding points, introduction of additional loss, limitation of antenna operating temperature, etc., while improving the stability and electrical performance of the antenna. The reflecting layer is connected with the bottom of the feed point needle, which can reflect and focus the radiation signal, enhancing the radiation directivity and gain of the antenna.

[0009] Further, the center of gravity of the feed point needle is located on the geometric symmetry axis of the gap. By setting the center of gravity of the feed point needle on the geometric symmetry axis of the gap, the electromagnetic coupling effect of the feed point needle on the first frequency band radiation electrode and the second frequency band radiation electrode is more uniform and symmetrical, which is beneficial to realize the circular polarization characteristics of the antenna.

[0010] Further, the dielectric matrix and the lower layer radiation electrode are provided with a slot hole and a through hole through which the feed point needle penetrates, and the center of the slot hole and / or the through hole corresponds to the geometric symmetry axis of the gap. This design provides precise positioning for the installation of the feed point needle, ensuring the relative position accuracy between the feed point needle and the upper and lower layer radiation electrodes. It helps to optimize the electromagnetic coupling effect, further improve the performance consistency and stability of the antenna, and reduce the performance fluctuation caused by installation errors.

[0011] Further, the thickness of the dual-frequency antenna is 4-8 mm.

[0012] Further, the feed point needle is a feed needle type or a patch type, and the number is 1, 2, 4 or 8. The feed point needle adopts two forms of feed needle type and patch type, which can be selected according to different application scenarios and process requirements, improving the applicability and flexibility of the antenna. Different number of feed point needles are set to flexibly adjust the radiation pattern, gain and polarization characteristics of the antenna.

[0013] Further, the dielectric matrix is a ceramic material.

[0014] Further, the antenna realizes the output of double-frequency signals through a single port. The setting of the single port outputting double-frequency signals effectively simplifies the antenna layout, reduces the volume and complexity, highly adapts to the needs of small-sized devices, significantly improves the integration, reduces the use of ports and related components, reduces the consumption of raw materials and production cost, and makes the maintenance work more convenient, further reduces the maintenance cost. At the same time, the synchronization and coordination of the double-frequency signals are ensured, the stability and reliability of the output are enhanced, the influence of external interference on the signals is reduced, and the anti-interference ability of the antenna is improved.

[0015] Further, the bottom of the dielectric substrate is provided with a groove, and the groove includes a first groove and a second groove arranged between the side surface and the bottom surface of the bottom of the dielectric substrate. On the one hand, the existence of the groove can adjust the low-frequency frequency of the antenna. By changing the size of the groove, the equivalent capacitance and inductance of the antenna can be changed, so that the low-frequency frequency can be effectively adjusted, and the performance of the antenna in the low-frequency band is optimized. On the other hand, the setting of the groove can reduce the material consumption of the dielectric substrate and reduce the weight of the antenna, which is suitable for application scenarios sensitive to weight, and also helps to reduce production cost.

[0016] Further, the shortest distance between the feed point needle and the slot is 0.1 mm.

[0017] Further, the first frequency band radiation electrode is provided with a frequency adjusting part. Due to the setting of the frequency adjusting part, the antenna realizes good performance in different working frequency bands, improves the versatility and adaptability of the antenna, and meets the requirements of different communication systems on frequency.

[0018] Further, the frequency adjusting part is one or more of a "U"-shaped protruding structure or a "T"-shaped recessed structure. The "U"-shaped protruding structure or the "T"-shaped recessed structure is used as the frequency adjusting part, and the electromagnetic characteristics of these specific structures are used to accurately adjust the frequency of the antenna. The "U"-shaped protruding structure and the "T"-shaped recessed structure change the current distribution and electromagnetic field distribution on the surface of the first frequency band radiation electrode, thereby affecting the resonant frequency and impedance of the antenna.

[0019] Compared with the prior art, the beneficial results of the utility model lie in:

[0020] 1. The utility model innovatively adopts a feed point needle and a radiation electrode electromagnetic coupling connection mode, completely abandoning the traditional welding process. This improvement not only greatly simplifies the process and effectively reduces the production cost, but also completely avoids the reliability hidden danger such as solder point falling off caused by the welding process. At the same time, the feed point needle realizes stable support through the dielectric substrate blind hole, greatly enhances the stability of the antenna structure. In addition, since the working temperature is not limited by the soldering material, the working temperature of the antenna of the utility model can be as high as 500 DEG C, which shows outstanding advantages in high-temperature environment and other special application scenarios, and significantly expands the application range of the antenna.

[0021] 2、The monomer coplanar circularly polarized dual-frequency antenna adopts integrated coplanar design, and by setting a groove in the dielectric base, the integration of the antenna is effectively improved, and the weight and volume of the antenna are significantly reduced. This design highly meets the urgent needs of modern devices for lightweight and miniaturization, greatly broadens the application scenarios of the antenna, and enables it to be widely used in devices with strict space and weight restrictions.

[0022] 3、The monomer coplanar circularly polarized dual-frequency antenna only needs to adjust the structure of the feed point needle, and can be flexibly switched between the feed needle type and the patch type two use processes. This feature provides great convenience for realizing standardized mass production of the antenna, helps to improve production efficiency, reduce production complexity, and enhance the competitiveness of the product in the market.

[0023] 4、The monomer coplanar circularly polarized dual-frequency antenna effectively optimizes the electromagnetic characteristics of the antenna by adopting the frequency modulation part in combination with the setting of the groove of the dielectric base, significantly improves the circularly polarized radiation performance and dual-frequency performance, better meets the strict requirements of high-precision positioning and other application scenarios on signal quality and frequency band adaptability, and has broad application prospects in many fields such as communication and navigation. BRIEF DESCRIPTION OF DRAWINGS

[0024] The accompanying drawings are included to provide a further understanding of embodiments and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments and serve the purpose of explaining principles of the present application. Other embodiments and many of the intended advantages of the present application will be readily appreciated as the same becomes better understood by reference to the following detailed description. Elements of the drawings are not necessarily to scale. Like reference numerals designate corresponding similar parts throughout.

[0025] Figure 1 is a whole structure diagram of the monomer coplanar circularly polarized dual-frequency antenna according to the present application;

[0026] Figures 2a-2b is a top view and a section view in A-A direction of the single-feed monomer coplanar circularly polarized dual-frequency antenna according to an embodiment of the present application;

[0027] Figure 3 is a structure diagram of the lower layer radiation electrode of the single-feed monomer coplanar circularly polarized dual-frequency antenna according to an embodiment of the present application;

[0028] Figures 4a-4b is a bottom view of the antenna body of the single-feed monomer coplanar circularly polarized dual-frequency antenna according to an embodiment of the present application;

[0029] Figure 5is a curve diagram of the reflection coefficient changing with frequency of the single-feed single-body coplanar circularly polarized dual-frequency antenna according to an embodiment of the present application;

[0030] Figure 6 is a Smith chart of the single-feed single-body coplanar circularly polarized dual-frequency antenna according to an embodiment of the present application;

[0031] Figure 7 is a perspective view of the single-feed single-body coplanar circularly polarized dual-frequency antenna according to a specific embodiment of the present application;

[0032] Figures 8a-8c is a top view, a B-B direction sectional view and an antenna body bottom view of the double-feed single-body coplanar circularly polarized dual-frequency antenna according to an embodiment of the present application;

[0033] Figures 9a-9c is a top view, a C-C direction sectional view and an antenna body bottom view of the four-feed single-body coplanar circularly polarized dual-frequency antenna according to an embodiment of the present application;

[0034] The meanings of the numbers in the figure are as follows: 100-upper layer radiation electrode, 200-lower layer radiation electrode, 300-dielectric base body, 400-feeding point needle, 500-reflecting layer, 600-slit, 101-first frequency band radiation electrode, 102-second frequency band radiation electrode, 201-first through hole, 202-second through hole, 301-first recess, 302-second recess, 303-slot hole, 401-first feeding point needle, 402-second feeding point needle, 403-third feeding point needle, 404-fourth feeding point needle, 1011-'U' shaped protruding structure, 1012-'T' shaped recessed structure, 1021-cross structure. DETAILED DESCRIPTION

[0035] In the following detailed description, reference is made to the accompanying drawings, which form a part hereof, and in which are shown by way of illustration illustrative embodiments in which the application can be practiced. For purposes of explanation and illustration, directional terms are used with reference to the orientation of the described figures. Because components of embodiments can be positioned in a number of different orientations, the directional terminology is used in connection with the illustrative embodiments for purposes of illustration only and is in no way limiting. It is to be understood that other embodiments can be utilized and logical changes can be made without departing from the scope of the present application. The following detailed description is, therefore, not to be taken in a limiting sense, and the scope of the present application is defined by the appended claims.

[0036] The present application provides a single-body coplanar circularly polarized dual-frequency antenna, Figures 1-3 , Figure 1 shows an overall structure diagram of the single-body coplanar circularly polarized dual-frequency antenna according to the present application, Figure 2a、 Figure 2b and Figure 3 respectively show the top view, the sectional view in A-A direction and the structure view of the lower radiation electrode of the single-feed single-body coplanar circularly polarized dual-band antenna. As shown in the figure, the single-body coplanar circularly polarized dual-band antenna comprises an antenna body and a reflecting layer 500, wherein the antenna body comprises an upper radiation electrode 100, a dielectric substrate 300, a lower radiation electrode 200 and a feed point pin 400. The upper radiation electrode 100 is mounted on the upper surface of the dielectric substrate 300, and the lower radiation electrode 200 is mounted on the lower surface of the dielectric substrate 300. The feed point pin 400 is fixed in the dielectric substrate 300 and electrically connected to the upper radiation electrode 100 and the lower radiation electrode 200 respectively by electromagnetic coupling. The upper radiation electrode 100 is composed of a first frequency band radiation electrode 101 and a second frequency band radiation electrode 102, and a gap 600 in geometric symmetry is arranged between the two. The bottom of the feed point pin 400 is connected to the reflecting layer 500, and the components cooperate to form the basic structure of the dual-band antenna.

[0037] In some specific embodiments, the center of gravity of the feed point pin 400 is located on the geometric symmetry axis of the gap 600, which helps to optimize the electromagnetic coupling effect of the antenna and improve the transmission performance of the dual-band signal. The dielectric substrate 300 and the lower radiation electrode 200 are provided with a slot hole 303 and a first through hole 201 for the feed point pin 400 to pass through, and the center of the slot hole 303 and / or the first through hole 201 corresponds to the geometric symmetry axis of the gap 600, which further ensures the stability of the electromagnetic coupling between the feed point pin 400 and the upper and lower radiation electrodes. The first through hole 201 is provided on the lower radiation electrode 200 and matched with the feed point pin 400, which provides a mounting position for the feed point pin 400 to ensure that it can accurately penetrate the lower radiation electrode 200 and be connected to the reflecting layer 500. The dielectric substrate 300 is a ceramic material with a certain dielectric constant, and the bottom thereof is provided with a groove, which comprises a first groove 301 and a second groove 302 arranged on the side surface and the bottom surface of the dielectric substrate, and the second through hole 202 is arranged in the middle of the lower radiation electrode 200 and matched with the second groove 302.

[0038] In some specific embodiments, Figure 4a and Figure 4b respectively show the antenna body bottom view of the single-feed single-body coplanar circularly polarized dual-band antenna. As shown in the figure, the feed point pin 400 has a feed pin type (as shown in the figure) and a patch type (as shown in the figure). Figure 4a Figure 4b ​Two types. By changing the shape of the tail of the feed needle, the feed point needle can be converted between the feed needle type and the patch type. This feature allows the same medium substrate to be adapted to both feed needle and patch processes, effectively improving production flexibility and product versatility during antenna manufacturing, reducing production costs and process complexity, and providing convenience for meeting antenna requirements in different application scenarios. In addition, a groove is provided at the bottom of the medium substrate 300, which includes a first groove 301 and a second groove 302 provided between the side surface and the bottom surface of the medium substrate bottom. This groove design has a dual function. First, the adjustment of the volume of the groove can effectively regulate the low frequency of the antenna. The principle is that the change of the groove structure will change the electromagnetic characteristics of the antenna. When the volume of the groove changes, the capacitance and inductance characteristics of the antenna as a whole will change accordingly. Specifically, when the volume of the groove increases, the distribution state of the electric field and the magnetic field of the antenna will be affected. In terms of electric field, the change in distribution range leads to a change in equivalent capacitance; in terms of magnetic field, the change in current distribution path leads to a change in equivalent inductance. According to the relationship formula between resonance frequency, capacitance and inductance in electromagnetism where f is the resonance frequency, L is the inductance, and C is the capacitance. Under the condition that other conditions are relatively stable, the change of capacitance and inductance will directly affect the resonance frequency. A large number of experiments have verified that in the design of the antenna, the larger the volume of the groove, the greater the amplitude of the increase in the low frequency of the antenna. This feature provides a simple and efficient adjustment method for optimizing the performance of the antenna in the low frequency band, which helps to improve the stability and accuracy of the antenna in low frequency signal reception and transmission.

[0039] In some specific embodiments, in combination with Figures 1-4b , the thickness of the dual-frequency antenna is 4mm-8mm, the shortest distance d1 between the feed point needle 400 and the slot 600 is 0.1mm, and the distance d2 from the center of the feed point needle 400 to the center of the second groove 302 satisfies the condition d2≤1 / 2L. The distance between the feed point needles is adjusted according to the size of the antenna and the size of the reflector. The smaller the distance between the feed point needle and the upper layer of the radiating electrode, the greater the coupling, and the antenna can obtain higher impedance.

[0040] In some specific embodiments, the number of feed point needles can be set to 1, 2, 4 or 8, all of which output dual-frequency signals through the same port.

[0041] Further reference is made to Figure 5 and Figure 6 , Figure 5 and Figure 6The graphs showing the reflection coefficient versus frequency and the corresponding Smith charts for the single-fed, single-unit, coplanar circularly polarized dual-frequency antenna according to this invention are shown respectively. Figure 5 In the graph, the horizontal axis represents frequency, ranging from 1.1 GHz to 1.7 GHz, and the vertical axis represents the logarithmic magnitude (dB) of the reflection coefficient. At 1.176 GHz and 1.575 GHz, the curve exhibits distinct troughs, with reflection coefficients of -32.789 dB and -30.530 dB, respectively. These low-frequency values ​​indicate that at these two frequency points, good impedance matching is achieved between the antenna and the transmission line, resulting in low signal reflection loss and thus enabling efficient signal transmission and radiation. Figure 6 The Smith chart presents the antenna's impedance characteristics from another perspective. Each point on the chart corresponds to the antenna's impedance value at different frequencies. At 1.176 GHz and 1.575 GHz, the corresponding impedance values ​​are 48.194 Ω, 1.4486 Ω, and 196.05 pH, and 48.354 Ω, 2.4201 Ω, and 244.55 pH, respectively. The positions of these two frequency points on the Smith chart indicate that their impedance characteristics are in an ideal state, consistent with... Figure 5 The good impedance matching reflected by the reflection coefficient curves mutually verify each other, jointly characterizing the excellent performance of the antenna in the two specific frequency bands of 1.176 GHz and 1.575 GHz.

[0042] In some specific embodiments, reference is made to Figure 2a and Figure 7 , Figure 7 A perspective view of a single-fed, single-unit, coplanar circularly polarized dual-band antenna according to a specific embodiment of the present invention is shown, as follows: Figure 2a and Figure 7 As shown, the first-band radiating electrode 101 is equipped with a frequency modulation section. When the position of the feed pin is fixed, by adjusting the shape and size of the frequency modulation section, the relative perimeter relationship between the first-band radiating electrode 101 and the second-band radiating electrode 102 is changed, simultaneously altering their distance from the feed pin and their relative area, thereby achieving precise adjustment of the antenna frequency and impedance. Figure 2a In this design, the frequency modulation section is a U-shaped protruding structure 1011, and the second-band radiation electrode 102 is provided with a cross structure 1021 adapted to the U-shaped protruding structure 1011. By precisely adjusting the dimensions and length of the U-shaped protruding structure 1011, fine adjustment of the first resonant frequency point within the 1.5-1.65 GHz frequency band can be achieved. Simultaneously, by adjusting the dimensions of the second-band radiation electrode 102 located on one side of the gap 600, fine adjustment of the second resonant frequency point within the 1.15-1.3 GHz frequency band can be achieved. Alternatively, the frequency modulation section can also employ a T-shaped recessed structure 1012. Figure 7By adjusting the length of the recess gap of the "T" shaped recess structure 1012, the first resonant frequency point in the 1.5-1.65GHz frequency band can also be fine-tuned; and by adjusting the size of the second frequency band radiation electrode 102 on the side of the gap 600, the second resonant frequency point in the 1.15-1.3GHz frequency band can still be adjusted. The first resonant frequency point and the second resonant frequency point correspond to the high frequency and the low frequency of the global satellite positioning system respectively, thereby realizing the function of receiving high-precision satellite signals.

[0043] In some specific embodiments, continuing to refer to Figures 8a-8c , Figures 8a-8c respectively show the top view, the B-B direction sectional view and the antenna body bottom view of the double-fed monomer coplanar circularly polarized dual-frequency antenna according to the utility model, as shown in the figure, the feed point needle 400 includes the first feed point needle 401 and the second feed point needle 402 that are arranged in the frequency modulation part adjacent position along the direction of the gap 600, the gravity centers of the first feed point needle 401 and the second feed point needle 402 are located on the geometric symmetry axis of the gap 600, and are fixed in the dielectric substrate 300 respectively, and simultaneously penetrate the bottom of the dielectric substrate 300 and the lower layer radiation electrode 200, and are connected with the reflecting layer 500. In the working process of the antenna, the first feed point needle 401 and the second feed point needle 402 interact with the first frequency band radiation electrode 101 and the second frequency band radiation electrode 102 in the upper layer radiation electrode 100, and realize the transmission of dual-frequency signals through electromagnetic coupling. In order to adapt to the double-feed point design, the dielectric substrate 300 and the lower layer radiation electrode 200 are provided with corresponding slot holes and through hole structures. The position relationship and connection mode between the layers of the double-feed antenna are similar to the single-feed antenna in principle. The position relationship, connection mode and related technical details of the layers of the single-feed antenna have been described in detail in the description, and for the sake of ensuring the conciseness and logicality of the description, they will not be repeated here. Figures 1-7

[0044] In some specific embodiments, continuing to refer to Figures 9a-9c , Figures 9a-9c ​The utility model discloses a four feed single body coplanar circularly polarized dual -frequency antenna's plan, C -C direction's sectional view and antenna body bottom view are shown respectively according to the utility model, as shown in the drawing, feed point needle 400 includes first feed point needle 401, second feed point needle 402, third feed point needle 403 and fourth feed point needle 404 that are arranged in turn along the direction of gap 600 clockwise, the center of gravity of four feed point needles is located on the geometric symmetry central axis of gap 600, and is fixed in the medium matrix 300 respectively, and simultaneously penetrates the bottom and lower layer radiation electrode 200 of medium matrix 300, is connected with the reflection layer 500. In the working process of the antenna, four feed point needles and first frequency band radiation electrode 101 and second frequency band radiation electrode 102 in the upper layer radiation electrode 100 interact, and the transmission of dual -frequency signal is realized through electromagnetic coupling. To adapt four feed point design, the medium matrix 300 and lower layer radiation electrode 200 are provided with corresponding slot and through -hole structure. The position relation and connection mode between the layers of the four feed antenna are similar to the single feed antenna in principle. The position relation, connection mode and related technical details of the layers of the single feed antenna have been described in detail in the description, to ensure the conciseness and logicality of the description, and here will not be repeated. Figures 1-7

[0045] Embodiment

[0046] The simulation experiment is carried out for the single feed single body coplanar circularly polarized dual -frequency antenna provided with the "U" type protruding structure frequency modulation part, and finally the elevation experimental data table in table 1 is obtained.

[0047] Table 1 elevation data of single feed single body coplanar circularly polarized dual -frequency antenna at different frequencies

[0048]

[0049] From the elevation data table, the single feed single body coplanar circularly polarized dual -frequency antenna presents significant dual -frequency characteristics, the low frequency range is 1166MHz-1186MHz, and the high frequency range is 1555MHz-1610MHz. From the gain variation law, the average gain of the low frequency range as a whole shows a downward trend with the increase of the elevation, and the high frequency range shows that part of the frequency points have higher gain at low elevation, and the gain of part of the frequency points decreases obviously at high elevation, and the gain variation trend of different frequencies is different. In terms of axial ratio characteristics, the average axial ratio value of the low frequency range at different elevations is relatively high, and the average axial ratio of part of the frequency points of the high frequency range is low at low elevation, which means that the circular polarization performance is relatively better at this time, which is verified by the antenna performance characteristics reflected by the Smith chart and the reflection coefficient curve, and the performance of the antenna at different frequency ranges and elevations is further clarified.

[0050] ​The utility model discloses in the connection mode of the feed point needle and the radiation electrode realizes the innovative breakthrough, discarded the traditional welding connection. This improvement reduces the welding procedure on one hand, avoids using solder, fits the energy -conserving and emission -reducing idea, effectively reduces production cost, on the other hand, the feed point needle is by medium matrix blind hole steady support, avoids the risk of feed point needle ejection drop due to external force, and the antenna reliability is greatly enhanced. In the working temperature aspect, the traditional antenna containing solder is usually limited to within 220 DEG C because of solder physical characteristic, and the utility model discloses dual -frequency antenna because of not using solder, and the working temperature can promote to 500 DEG C, and the application scene is significantly expanded. In addition, the utility model discloses dual -frequency antenna in the process application is dominant, only needs to adjust the feed point needle structure, and can be flexibly switched between the feed needle formula and the patch formula two processes, provides the convenience for the standardized mass production, helps to improve production efficiency, reduces production complexity, and promotes product market competitiveness.

[0051] Obviously, those skilled in the art can make various modifications and changes to the embodiments of the utility model without departing from the spirit and scope of the utility model. In this way, the utility model also aims to cover these modifications and changes if they are within the scope of the claims of the utility model and their equivalents. The word "comprising" does not exclude the presence of other elements or steps not listed in the claims. The simple fact that certain measures are recited in mutually different dependent claims does not mean that the combination of these measures cannot be used to advantage. Any reference signs in the claims should not be considered as limiting the scope.

Claims

1. A monopole co-planar circularly polarized dual-band antenna, characterized in that, The antenna comprises an upper layer radiation electrode, a dielectric substrate, a lower layer radiation electrode, a reflecting layer and a feed point needle, the upper and lower surfaces of the dielectric substrate are respectively provided with the upper layer radiation electrode and the lower layer radiation electrode, the feed point needle is fixed in the dielectric substrate and is electrically connected with the upper layer radiation electrode and the lower layer radiation electrode through electromagnetic coupling, the upper layer radiation electrode comprises a detachable first frequency band radiation electrode and a second frequency band radiation electrode, a gap in geometric symmetry is arranged between the first frequency band radiation electrode and the second frequency band radiation electrode, and the bottom of the feed point needle is connected with the reflecting layer.

2. The monolithic co-planar circularly polarized dual-band antenna according to claim 1, wherein, The center of gravity of the feed point needle is located on the geometric symmetry central axis of the gap.

3. The monolithic co-planar circularly polarized dual-band antenna according to claim 1, wherein, The dielectric substrate and the lower layer radiation electrode are provided with a slot hole and a through hole through which the feed point needle penetrates, and the center of the slot hole and / or the through hole corresponds to the geometric symmetry central axis of the gap.

4. The monolithic co-planar circularly polarized dual-band antenna according to claim 1, wherein, The thickness of the antenna is 4-8 mm.

5. The monolithic co-planar circularly polarized dual-band antenna according to claim 1, wherein, The feed point needle is a feed needle type or a patch type, and the number thereof is 1, 2, 4 or 8.

6. The monolithic co-planar circularly polarized dual-band antenna according to claim 1, wherein, The antenna realizes the output of double frequency signals through a single port.

7. The monolithic co-planar circularly polarized dual-band antenna according to claim 1, wherein, The bottom of the dielectric substrate is provided with a groove, and the groove comprises a first groove and a second groove arranged between the side surface and the bottom surface of the bottom of the dielectric substrate.

8. The monolithic co-planar circularly polarized dual-band antenna according to claim 1, wherein, The shortest distance between the feed point needle and the gap is 0.1 mm.

9. The monolithic co-planar circularly polarized dual-band antenna according to claim 1, wherein, The first frequency band radiation electrode is provided with a frequency modulation part.

10. The monolithic co-planar circularly polarized dual-band antenna according to claim 9, wherein, The frequency modulation part is one or more of a "U" type protruding structure or a "T" type recessed structure.

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