CN214589252U - Back feed capacitance disc type double-fed microstrip antenna - Google Patents
Back feed capacitance disc type double-fed microstrip antenna Download PDFInfo
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- CN214589252U CN214589252U CN202120531542.7U CN202120531542U CN214589252U CN 214589252 U CN214589252 U CN 214589252U CN 202120531542 U CN202120531542 U CN 202120531542U CN 214589252 U CN214589252 U CN 214589252U
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Abstract
The utility model belongs to the technical field of the microstrip antenna structure, concretely relates to back feed holds disk double-fed microstrip antenna, include: a dielectric substrate provided with a radiation surface and a ground surface; the radiation patch is arranged on the radiation surface and used for transmitting and receiving electromagnetic waves; the feed tray is arranged on the radiation surface, is arranged at an interval with the radiation patch and is used for forming a feed point of the microstrip antenna through a capacitive coupling effect with the radiation patch; a ground patch disposed on the ground plane. The utility model discloses optimized microstrip antenna excitation mode, changed electric capacity disk coupling excitation mode into from the lug connection excitation, improved the double-fed some interval of low frequency part and separated, improved the problem that antenna back mismatch energy was revealed simultaneously.
Description
Technical Field
The utility model belongs to the technical field of the microstrip antenna structure, concretely relates to back feed holds disk double-fed microstrip antenna.
Background
Along with the popularization of intelligent equipment, more and more intelligent terminals use wireless communication technology. The microstrip antenna is used as a key part of a wireless communication application system such as radar, Wi-Fi, Bluetooth, broadcasting, guidance and the like, and directly influences the communication distance of the wireless communication application system. Particularly, with the development of the IOT technology, the smaller the product is, the stronger the antenna requirements of the wireless communication product on excellent performance, small area and low cost are. The existing microstrip antenna (micro strip antenna) is an antenna formed by attaching a metal layer on a thin dielectric substrate as a reference ground of the antenna, forming the metal layer with a certain shape and size on the other surface by using methods such as photoetching and corrosion, drilling a small through hole in the metal surface or accessing a microstrip line from the side surface as an access feed point of a signal, and feeding a patch by using the microstrip line or a coaxial probe.
The prior art adopts a single feed point radiation patch form, and the single radiation patch of the radiation patch can only be used for transmitting or receiving a link, and has the following disadvantages in application:
1. two radiation patches are required to be used as an emission radiation patch and a reception radiation patch respectively, so that a larger PCB area is required, the product cost is increased, and the miniaturization of the product is not facilitated;
2. circuits such as a balun or an electric bridge and the like are added in a receiving and transmitting link to increase receiving and transmitting isolation, and then the single feed point antenna can be accessed, so that the complexity of system design is increased, the design difficulty of a product is greatly increased, and meanwhile, the circuit area is increased, and the miniaturization design of the product is not facilitated;
3. when the receiving and transmitting link is directly connected to the single feed point antenna, the receiving and transmitting isolation degree is poor, the system performance is limited, and the receiving and transmitting link can only be used in a system with low requirement on the receiving and transmitting isolation degree.
In addition, according to the microwave antenna principle, the size of the radiation patch is inversely proportional to its resonant frequency under the condition that the shape of the radiation patch is fixed. The existing microstrip radiation patch is generally rectangular, and for a certain required resonant frequency, the area of the corresponding radiation patch is larger, so that the area and the cost of a product are increased to a certain extent.
SUMMERY OF THE UTILITY MODEL
In view of the above, the utility model provides a back feed capacitance disc type double-fed microstrip antenna, for the microstrip antenna system of receiving and dispatching full duplex, only need one antenna face when adopting this design microstrip antenna, just can realize receiving and dispatching simultaneously, the effective product area that has reduced saves cost; by adopting the antenna with the design, a receiving and transmitting isolation circuit such as a balun or an electric bridge does not need to be designed on the system, so that the complexity of system design is reduced; the designed antenna utilizes the antenna polarization isolation principle, ensures the isolation between the receiving and transmitting links in the state of only using one antenna, reduces the mutual influence between the receiving and transmitting links and ensures the performance of the system.
And simultaneously, the utility model discloses optimized microstrip antenna excitation mode, changed electric capacity disk coupling excitation mode into from the lug connection excitation, improved the separation between the low frequency part double-feed point, improved the problem that antenna back mismatch energy was revealed simultaneously.
In order to achieve the technical purpose, the utility model discloses the concrete technical scheme who adopts is:
a backfeed capacitive-disk doubly-fed microstrip antenna comprising:
a dielectric substrate including a radiating plane and a ground plane;
the radiation patch is arranged on the radiation surface and used for transmitting and receiving electromagnetic waves;
the feed tray is arranged on the radiation surface, is arranged at an interval with the radiation patch and is used for forming a feed point of the microstrip antenna through a capacitive coupling effect with the radiation patch;
a ground patch disposed on the ground plane.
Further, the feed tray is patch-shaped.
Further, the feed tray comprises a transmitting feed tray and a receiving feed tray.
Further, the transmitting feed tray and the receiving feed tray have the same structure, and an included angle formed by the transmitting feed tray, the central point of the radiation patch and the receiving feed tray is 80-100 degrees.
Further, the feed pad is 4N-sided polygon, circle or ellipse, wherein N is 1, 2, 3.
Furthermore, an avoidance ring is arranged between the feed panel and the radiation patches.
Furthermore, the width of the avoiding ring is 0.15-0.25 mm.
Furthermore, a feed hole is also arranged on the microstrip antenna; the feed hole penetrates through the feed panel, the dielectric substrate and the grounding patch at the same time.
Furthermore, isolating rings are arranged between the feed hole and the grounding patch.
Further, the width of the isolating ring is 0.15-0.35 mm.
Adopt above-mentioned technical scheme, the utility model discloses following beneficial effect can be brought:
1. the utility model discloses a transmission feeder tray and receipt feeder tray all set up on the radiation surface, inlay the sculpture in the radiation paster, the centre set up not sculpture ring or set up other insulator with radiation paster electricity interval sets up, when radar wave signal receiving and dispatching, because the capacitive coupling effect, transmission feeder tray and receipt feeder tray form the capacitive coupling relation with the radiation paster. Therefore, the radiating patch can be matched with the transmitting feed tray and the receiving feed tray by adjusting the areas of the transmitting feed tray and the receiving feed tray to play a role of an impedance converter;
2. the feed tray is arranged inside the radiation patch instead of the traditional externally coupled excitation antenna, so that the radiation patch with smaller area can be needed under the condition of realizing the same microstrip antenna function;
3. compared with the traditional excitation mode of direct connection, the method has the advantages that the problem of poor isolation of low-frequency signals can be effectively solved by adopting a capacitive coupling excitation radiation patch mode;
4. meanwhile, the capacitor disc type coupling excitation part is arranged at the edge part of the capacitor disc instead of the via hole part, so that the problem of back leakage of the traditional back feed type microstrip antenna can be effectively solved.
5. The utility model provides a round or oval transmission feed tray and a receiving feed tray, which can increase the excitation effect;
6. the utility model discloses set up the transmission feed hole and receive the feed hole, make other equipment connect the transmission feed tray and receive the feed tray at microstrip antenna's back, can reduce the influence to the radiation paster function of receiving and dispatching.
7. The utility model discloses a dodge ring and spacer ring and be the non-etching district on the medium substrate, can simplify technology, reduction in production cost.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a radiation surface view of a back-fed capacitive disc type double-fed microstrip antenna according to an embodiment of the present invention;
fig. 2 is a ground plane view of a back-fed capacitive disc type dual-fed microstrip antenna according to an embodiment of the present invention;
fig. 3 is a side view of a back-fed capacitive disc type dual-fed microstrip antenna according to an embodiment of the present invention;
wherein: 1. a dielectric substrate; 2. a radiation patch; 3. a transmitting feed tray; 4. receiving a feed tray; 5. a transmit feed aperture; 6. receiving a feed hole; 7. an avoidance ring; 8. an isolating ring; 9. a ground patch.
Detailed Description
The embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. The present invention can also be implemented or applied through other different specific embodiments, and various details in the present specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It is noted that various aspects of the embodiments are described below within the scope of the appended claims. It should be apparent that the aspects described herein may be embodied in a wide variety of forms and that any specific structure and/or function described herein is merely illustrative. Based on the disclosure, one skilled in the art should appreciate that one aspect described herein may be implemented independently of any other aspects and that two or more of these aspects may be combined in various ways. For example, an apparatus may be implemented and/or a method practiced using any number of the aspects set forth herein. Additionally, such an apparatus may be implemented and/or such a method may be practiced using other structure and/or functionality in addition to one or more of the aspects set forth herein.
It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention, and the drawings only show the components related to the present invention rather than being drawn according to the number, shape and size of the components in actual implementation, and the form, amount and ratio of the components in actual implementation can be changed at will, and the layout of the components may be more complicated.
In addition, in the following description, specific details are provided to facilitate a thorough understanding of the examples. However, it will be understood by those skilled in the art that the aspects may be practiced without these specific details.
In an embodiment of the present invention, a backfeed capacitance disc type double-fed microstrip antenna is provided, which is applied to receive and transmit radar signals in 5.8GHz band, as shown in fig. 1 to 3, including:
a dielectric substrate 1 including a radiation plane and a ground plane; in this embodiment, the dielectric substrate 1 is made of FR4, and has an area larger than the preset radiation patch 2 and ground patch 9;
the radiation patch 2 is arranged on the radiation surface and used for transmitting and receiving electromagnetic waves, and is made of a copper sheet which is etched on the medium substrate 1 and is circular, oval or regular 4N-sided;
the grounding patch 9 is arranged on the grounding surface, the material is copper sheets etched on the medium substrate 1, in order to prevent the edge effect from influencing the performance of the antenna, the area is slightly larger than the radiation patch 2, and the edge exceeds the edge of the radiation patch 2 by 1-2 mm or more than 1-2 mm during orthographic projection;
the transmitting feed tray 3 is arranged on the radiating surface, made of copper sheets, embedded and etched in the radiating patch 2, provided with a non-etching ring in the middle or provided with other insulators arranged at intervals with the radiating patch 2 and used for forming a transmitting feed point of the microstrip antenna through a capacitive coupling effect with the radiating patch 2;
the receiving feed tray 4 is arranged on the radiation surface, made of a copper sheet, embedded and etched in the radiation patch 2, provided with a non-etching ring in the middle or provided with other insulators electrically spaced from the radiation patch 2 and used for forming a receiving feed point of the microstrip antenna through a capacitive coupling effect with the radiation patch 2;
the function of the transmitting feed pad 3 and the receiving feed pad 4 is to replace the transmitting feed point and the receiving feed point, which are also called impedance converters, and to weaken the reflected wave in the circuit, thereby reducing the loss. Meanwhile, the gain, noise and output power of the device are also influenced significantly.
In this embodiment, the transmitting feed tray 3 and the receiving feed tray 4 are both disposed on the radiation surface, and are embedded and etched in the radiation patch 2, and an un-etched ring or other insulator is disposed in the middle of the radiation patch 2 at an electrical interval, so that the transmitting feed tray 3, the receiving feed tray 4 and the radiation patch 2 form a capacitive coupling relationship due to a capacitive coupling effect when a radar wave signal is received and transmitted. Therefore, the feed tray 3 and the receiving feed tray 4 can be matched with the radiation patch 2 to play a role of an impedance converter by adjusting the area, in the embodiment, the feed tray is placed inside the radiation patch 2 instead of being placed in an external coupling excitation antenna in the prior art, so that the radiation patch 2 with a smaller area can be needed under the condition of realizing the same microstrip antenna function;
compared with the traditional excitation mode of direct connection, the mode of exciting the radiation patch 2 by capacitive coupling can effectively improve the problem of poor isolation of low-frequency signals;
meanwhile, the capacitor disc type coupling excitation part is arranged at the edge part of the capacitor disc instead of the via hole part, so that the problem of back leakage of the traditional back feed type microstrip antenna can be effectively solved.
In this embodiment, a dual-feed microstrip antenna scheme may also be employed in which a feed pad is combined with a feed point of conventional form.
In one embodiment, in order to maximize the isolation between the two feed trays, as shown in fig. 1, the radiation patch 2 is circular, and the transmission feed tray 3 and the reception feed tray 4 are both patch-shaped; the transmitting feed tray 3 and the receiving feed tray 4 have the same structure; the included angle formed by the transmitting feed tray 3, the central point of the radiation patch 2 and the receiving feed tray 4 is 80-100 degrees, the optimal angle is 90 degrees under the general condition, and the length of the transmitting feed tray 3 from the central point of the radiation patch 2 is equal to the length of the receiving feed tray 4 from the central point of the radiation patch 2.
In this embodiment, the shape of the radiation patch 2 is 4N-sided polygon, circle or ellipse, and in order to increase the excitation effect, as shown in fig. 1, the transmission feed pad 3 and the reception feed pad 4 are 4N-sided polygon, circle or ellipse in accordance with the shape of the radiation patch 2.
In one embodiment, as shown in fig. 1-2, the radiating patch 2, the transmit feed pad 3 and the receive feed pad 4 are all circular; the included angle of the transmitting feed tray 3, the central point of the radiation patch 2 and the receiving feed tray 4 is 90 degrees. Aiming at the receiving and sending of radar signals in a 5.8GHz wave band, the thickness of a dielectric substrate 1 is 0.5-2.2 mm, the dielectric constant is 1.8-5.5, the diameter of a radiation patch 2 is 11.6-13.2 mm, the distance between the center point of a feed panel and the center point of the radiation patch 2 is designed to be 3-5 mm, and the diameter of the feed panel is more than 2 mm.
In one embodiment, as shown in fig. 1, an avoidance ring 7 is disposed between the radiation patch 2 and each of the transmitting feed pad 3 and the receiving feed pad 4, and in this embodiment, the avoidance ring 7 is a non-etched ring in the above embodiment, and the width of the avoidance ring 7 is kept consistent and set to be 0.15-0.25 mm.
In one embodiment, as shown in fig. 1 or fig. 3, in order to reduce the influence on the transceiving function of the radiation patch 2, it is necessary to connect the transmitting feed pad 3 and the receiving feed pad 4 to other devices on the back surface of the microstrip antenna, so that the microstrip antenna is further provided with a transmitting feed hole 5 and a receiving feed hole 6; the transmitting feed hole 5 simultaneously penetrates through the transmitting feed panel 3, the dielectric substrate 1 and the grounding patch 9; the receiving feed hole 6 penetrates through the receiving feed plate 4, the dielectric substrate 1 and the grounding patch 9 at the same time.
In one embodiment, as shown in fig. 3, in order to avoid mistakenly touching the ground patch 9 when connecting the transmitting feed pad 3 and the receiving feed pad 4, isolation rings 8 are disposed between the transmitting feed hole 5 and the receiving feed hole 6 and the ground patch 9, and the isolation rings 8 are non-etching regions, have consistent widths, and are set to be 0.15-0.35 mm.
The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A back feed capacitance disc type double-fed microstrip antenna is characterized by comprising:
a dielectric substrate provided with a radiation surface and a ground surface;
the radiation patch is arranged on the radiation surface and used for transmitting and receiving electromagnetic waves;
the feed tray is arranged on the radiation surface, is arranged at an interval with the radiation patch and is used for forming a feed point of the microstrip antenna through a capacitive coupling effect with the radiation patch;
a ground patch disposed on the ground plane.
2. The microstrip antenna of claim 1, wherein: the feed tray is patch-shaped.
3. The microstrip antenna of claim 2, wherein: the feed panel comprises a transmitting feed panel and a receiving feed panel.
4. The microstrip antenna of claim 3, wherein: the transmitting feed tray and the receiving feed tray have the same structure, and an included angle formed by the transmitting feed tray, the central point of the radiation patch and the receiving feed tray is 80-100 degrees.
5. The microstrip antenna of claim 3, wherein: the feed tray is 4N-sided polygon, circle or ellipse, wherein N1, 2, 3.
6. A microstrip antenna according to any of claims 2 to 5 wherein: an avoidance ring is arranged between the feed panel and the radiation patch.
7. The microstrip antenna of claim 6, wherein: the width of the avoiding ring is 0.15-0.25 mm.
8. The microstrip antenna of claim 1, wherein: the microstrip antenna is also provided with a feed hole; the feed hole penetrates through the feed panel, the dielectric substrate and the grounding patch at the same time.
9. The microstrip antenna of claim 8, wherein: and isolation rings are arranged between the feed hole and the grounding patch.
10. The microstrip antenna of claim 9, wherein: the width of the isolating ring is 0.15-0.35 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120531542.7U CN214589252U (en) | 2021-03-12 | 2021-03-12 | Back feed capacitance disc type double-fed microstrip antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120531542.7U CN214589252U (en) | 2021-03-12 | 2021-03-12 | Back feed capacitance disc type double-fed microstrip antenna |
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| Publication Number | Publication Date |
|---|---|
| CN214589252U true CN214589252U (en) | 2021-11-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120531542.7U Active CN214589252U (en) | 2021-03-12 | 2021-03-12 | Back feed capacitance disc type double-fed microstrip antenna |
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| CN (1) | CN214589252U (en) |
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- 2021-03-12 CN CN202120531542.7U patent/CN214589252U/en active Active
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