CN213483978U - Double-frequency filtering antenna - Google Patents
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- CN213483978U CN213483978U CN202022793228.4U CN202022793228U CN213483978U CN 213483978 U CN213483978 U CN 213483978U CN 202022793228 U CN202022793228 U CN 202022793228U CN 213483978 U CN213483978 U CN 213483978U
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Abstract
The application discloses a dual-frequency filtering antenna, which comprises a top radiation metal patch, a middle medium substrate and a bottom grounding plate; the top radiation metal patch comprises a radiation patch unit, a double-frequency filter, a first microstrip feeder line connected between the radiation patch unit and the double-frequency filter, and a second microstrip feeder line connected between the double-frequency filter and a signal feed point; the tail end of the second microstrip feeder line is a signal feed point of the antenna; the input end and the output end of the double-frequency filter are a pair of parallel wires, and the double-frequency filter comprises two U-shaped resonators and an E-shaped resonator; the two U-shaped resonators are arranged in a vertically coupled mode and coupled among the parallel wires to form a first pass band of the double-frequency filter; the E-shaped resonator is coupled between the parallel wires and arranged oppositely to the two U-shaped resonators to form a second pass band of the dual-frequency filter. The method and the device can effectively realize independent adjustment of the center frequency and the bandwidth of each passband, and improve the design and debugging efficiency of the filtering antenna.
Description
Technical Field
The application relates to the technical field of antenna design, in particular to a dual-frequency filtering antenna.
Background
Compared with the existing dual-frequency and multi-frequency antenna, the scheme of the multi-frequency antenna and the multi-frequency filter can properly reduce the system volume and obtain more stable anti-frequency-band interference performance.
The antenna and the filter are important components in the communication system, and the performance of the antenna and the filter directly affects the overall performance of the whole communication system. In a wireless communication system, a multi-frequency filter mainly adopts a resonant coupling design mode, and various target pass bands are realized by using parasitic pass bands of coupling resonators, so that the function of the multi-frequency filter is realized. However, the designed multifrequency filter in the prior art is difficult to simultaneously satisfy independent adjustment of the center frequency and the bandwidth of each passband, which causes great trouble to the design and debugging of the multifrequency antenna. In view of the above, it is an important need for those skilled in the art to provide a solution to the above technical problems.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a dual-frenquency filters antenna to under the condition that does not increase overall dimension, effectively solve the unable independent problem of adjusting of every passband center frequency and bandwidth of multifrequency antenna.
In order to solve the above technical problem, in a first aspect, the present application discloses a dual-band filtering antenna, including a top radiation metal patch, a middle dielectric substrate, and a bottom ground plate; the top layer radiation metal patch comprises a radiation patch unit, a double-frequency filter, a first microstrip feeder line connected between the radiation patch unit and the output end of the double-frequency filter, and a second microstrip feeder line connected between the input end of the double-frequency filter and a signal feed point; the tail end of the second microstrip feeder line is the signal feed point of the antenna;
the input end and the output end of the double-frequency filter are a pair of parallel wires, and the double-frequency filter also comprises two U-shaped resonators and an E-shaped resonator; the two U-shaped resonators are arranged in a vertically coupled mode and coupled between the parallel wires to form a first pass band of the dual-frequency filter; the E-shaped resonator is also coupled between the parallel wires and arranged oppositely to the two U-shaped resonators to form a second pass band of the dual-frequency filter.
Optionally, the two U-shaped resonators are quarter-wave resonators, adjacent ends of the two U-shaped resonators are grounded, and a center frequency of the first passband is 2.4 GHz.
Optionally, a middle branch of the E-shaped resonator is wider than the two side branches and longer than the two side branches, a rectangular impedance patch is loaded at the end of the middle branch, and the center frequency of the second passband is 5 GHz.
Optionally, the radiating patch element is an inverted trapezoid.
Optionally, the top side length, the bottom side length, and the height of the radiation patch unit are 20mm, 5mm, and 16mm, respectively.
Optionally, the first microstrip feed line has a size of 5.6mm × 1.7 mm; the size of the second microstrip feeder line is 5.2mm multiplied by 1.7 mm.
Optionally, the underlying ground plate comprises a ground patch having a substantially rectangular shape with rounded edges.
Optionally, the top of the ground patch is provided with a concave groove for increasing the current surface path.
Optionally, the material of the dielectric substrate is polydimethylsiloxane.
Optionally, the overall size of the top radiating metal patch is 42.8mm × 64.4 mm.
The dual-frequency filtering antenna provided by the application comprises a top layer radiating metal patch, a middle medium substrate and a bottom layer grounding plate; the top layer radiation metal patch comprises a radiation patch unit, a double-frequency filter, a first microstrip feeder line connected between the radiation patch unit and the output end of the double-frequency filter, and a second microstrip feeder line connected between the input end of the double-frequency filter and a signal feed point; the tail end of the second microstrip feeder line is the signal feed point of the antenna; the input end and the output end of the double-frequency filter are a pair of parallel wires, and the double-frequency filter also comprises two U-shaped resonators and an E-shaped resonator; the two U-shaped resonators are arranged in a vertically coupled mode and coupled between the parallel wires to form a first pass band of the dual-frequency filter; the E-shaped resonator is also coupled between the parallel wires and arranged oppositely to the two U-shaped resonators to form a second pass band of the dual-frequency filter.
The dual-frequency filtering antenna provided by the application has the beneficial effects that: this application has used novel resonance coupling structure's dual-frenquency wave filter, can effectively realize the independent regulation of each passband center frequency and bandwidth, has greatly improved filtering antenna's design and debugging efficiency. Moreover, the connection structure that the double-frequency filter is cascaded to the feeder line of the antenna is adopted, so that the radiation influence of the double-frequency filter on the antenna is small, the radiation characteristic of the antenna is kept, the antenna and the double-frequency filter can be designed separately, and the design flexibility is large.
Drawings
In order to more clearly illustrate the technical solutions in the prior art and the embodiments of the present application, the drawings that are needed to be used in the description of the prior art and the embodiments of the present application will be briefly described below. Of course, the following description of the drawings related to the embodiments of the present application is only a part of the embodiments of the present application, and it will be obvious to those skilled in the art that other drawings can be obtained from the provided drawings without any creative effort, and the obtained other drawings also belong to the protection scope of the present application.
Fig. 1 is a front view of a dual-band filtering antenna disclosed in an embodiment of the present application;
fig. 2 is a schematic diagram of an underlying ground plane of a dual-band filtering antenna according to an embodiment of the present application;
fig. 3 is a graph illustrating simulation curves of performance of a dual-band filter according to an embodiment of the present disclosure;
fig. 4 is a graph illustrating simulation of performance of a dual-band filtering antenna according to an embodiment of the present disclosure;
fig. 5 is a radiation pattern of a dual-band filtering antenna provided in an embodiment of the present application when the dual-band filtering antenna operates at 2.4 GHz;
fig. 6 is a radiation pattern of a dual-band filtering antenna provided in this embodiment of the present application when the antenna operates at 5 GHz.
Detailed Description
The core of the application lies in providing a dual-frequency filtering antenna to under the condition that the whole size is not increased, effectively solve the problem that the central frequency and the bandwidth of each passband of the multi-frequency antenna can not be independently adjusted.
In order to more clearly and completely describe the technical solutions in the embodiments of the present application, the technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Compared with the existing dual-frequency and multi-frequency antenna, the scheme of the multi-frequency antenna and the multi-frequency filter can properly reduce the system volume and obtain more stable anti-frequency-band interference performance.
The antenna and the filter are important components in the communication system, and the performance of the antenna and the filter directly affects the overall performance of the whole communication system. In a wireless communication system, a multi-frequency filter mainly adopts a resonant coupling design mode, and various target pass bands are realized by using parasitic pass bands of coupling resonators, so that the function of the multi-frequency filter is realized. However, the designed multifrequency filter in the prior art is difficult to simultaneously satisfy independent adjustment of the center frequency and the bandwidth of each passband, which causes great trouble to the design and debugging of the multifrequency antenna. In view of this, the present application provides a dual-band filtering antenna, which can effectively solve the above-mentioned problems.
The embodiment of the application discloses a dual-frequency filtering antenna which mainly comprises a top layer radiating metal patch, a middle medium substrate and a bottom layer grounding plate. Referring to fig. 1 in a front view, the top-layer radiating metal patch includes a radiating patch unit 101, a dual-frequency filter 102, a first microstrip feed line 103 connected between the radiating patch unit 101 and an output end of the dual-frequency filter 102, and a second microstrip feed line 104 connected between an input end of the dual-frequency filter 102 and a signal feed point; the tail end of the second microstrip feed line 104 is a signal feed point of the antenna;
the input end and the output end of the dual-frequency filter 102 are a pair of parallel wires, and the dual-frequency filter 102 further comprises two U-shaped resonators and an E-shaped resonator; the two U-shaped resonators are arranged in a vertically coupled manner and coupled between the parallel wires to form a first pass band of the dual-frequency filter 102; the E-shaped resonators are also coupled between the parallel traces and are arranged opposite the two U-shaped resonators to form a second pass band of the dual band filter 102.
Specifically, the dual-band filtering antenna provided by the present application employs an overall structure in which the dual-band filter 102 is cascaded to the feed line of the broadband antenna. The dual-band filter 102 is structurally divided into two paths, and has two pass bands, so as to implement dual-band filtering.
It should be noted that the dual-band filter 102 provided in the present application employs a novel combined resonator coupling structure design, so as to effectively solve the problem that the center frequency and the bandwidth of each passband of the multi-band antenna cannot be independently adjusted. The first path of the resonator is composed of two U-shaped resonators which are arranged up and down and are turned over by 90 degrees, and the second path of the resonator is composed of an E-shaped resonator. The paths of the two channels are coupled to the resonator in the channel from the input end of the dual-frequency filter 102 and then coupled to the output end of the dual-frequency filter 102 from the resonator, and there is no coupling between the two channels. When combined into the dual-band filter 102, the three resonators have a relatively small mutual influence and are substantially negligible.
It should be further noted that the two U-shaped resonators and the E-shaped resonator are arranged in parallel and opposite to each other between the parallel traces, that is, the opening directions of the two U-shaped resonators are opposite to the opening direction of the E-shaped resonator. For example, in fig. 1, two U-shaped resonator openings located on the left side are to the left, and an E-shaped resonator opening located on the right side is to the right. Of course, one skilled in the art can choose another back-to-back arrangement, with the E-shaped resonator on the left side and open to the left, and the two U-shaped resonators on the right side and open to the right.
It should be added that the E-shaped resonator in this application is only shaped like the letter E, and the lengths of the three branches from top to bottom do not need to strictly follow the rule of the letter E. In fact, to improve the filtering performance, as a preferred scheme, the length and the width of the middle branch of the E-shaped resonator are respectively larger than those of the branches at the two sides.
Further, the end of the second microstrip feed line 104 connected to the dual band filter 102 is a signal feed point of the antenna. It will be readily understood by those skilled in the art that the ground plate may be connected thereto by a microwave high frequency connector, such as a conventional sma (small a type) connector.
It should also be noted that the dual-band filter 102 provided by the present application also uses a parallel line feeding manner: the input end and the output end of the device are a pair of parallel wires. The radiation patch unit 101 is a main body component of the broadband antenna, and the radiation patch unit 101 is connected to the output end of the dual-frequency filter 102 through a monopole, i.e., a first microstrip feeder 103; and the input of the dual band filter 102 is connected to a second microstrip feed line 104.
The dual-frequency filtering antenna provided by the application uses the dual-frequency filter 102 with a novel resonance coupling structure, can effectively realize independent adjustment of the center frequency and the bandwidth of each pass band, and greatly improves the design and debugging efficiency of the filtering antenna. In addition, the dual-frequency filter 102 is connected to the feeder line of the antenna in a cascading mode through the connecting structure, so that the dual-frequency filter 102 has small radiation influence on the antenna, the radiation characteristic of the antenna is kept, the antenna and the dual-frequency filter 102 can be designed separately, and design flexibility is large.
As a specific embodiment, as shown in fig. 1, in the dual-band filtering antenna provided in the embodiment of the present application, based on the above contents, the two U-shaped resonators are quarter-wave resonators, the adjacent ends of the two U-shaped resonators are grounded, and the center frequency of the first pass band is 2.4 GHz.
In fig. 1, the black points at the adjacent ends of the two U-shaped resonators are two grounding points of the dual-band filter. Further, in a specific embodiment, the length of the input end and the output end of the dual-band filter 102 is 22.3mm, and the width thereof is w2 is 0.5 mm. The length dimension of the U-shaped resonator is l 1-8.5 mm, the width dimension w 1-1 mm, and the height dimension l 2-5.4 mm; the size of a gap between the two U-shaped resonators is s 1-0.3 mm; the size of the gap between the U-shaped resonator and the input end or the output end is 0.2mm which is s2 mm.
As a specific embodiment, as shown in fig. 1, in the dual-band filtering antenna provided in this embodiment of the present application, based on the above contents, the middle branch of the E-shaped resonator is wider than and longer than the two side branches, and a rectangular impedance patch is loaded at the end of the middle branch, so that the center frequency of the second passband of the second channel is 5 GHz.
Specifically, in order to obtain more stable filtering performance, the present embodiment further improves the shape of the original E-shaped resonator on the basis of the shape of the original E-shaped resonator, that is, a rectangular impedance patch is further disposed at the end of the middle branch. The width of the rectangular impedance patch is larger than that of the middle branch, so that the middle branch is combined into a stepped impedance branch after the rectangular impedance patch is loaded. In a specific embodiment, the length dimension of each branch of the E-shaped resonator at two ends is l 4-4 mm, the width dimension is w 3-0.3 mm, and the length dimension from the middle branch is l 3-5.6 mm; the length of the middle branch is l 5-4.5 mm, and the width is w 4-0.6 mm; the rectangular impedance patch has dimensions w6 × l9 ═ 2mm × 2.5 mm.
As a specific embodiment, as shown in fig. 1, in the dual-band filtering antenna provided in the embodiment of the present application, based on the above, the radiation patch unit 101 is in an inverted trapezoid shape. The inverted trapezoidal shape of the radiating patch element 101 enables further broadening of the impedance bandwidth compared to a conventional rectangular design.
Further, in a specific embodiment, the top side ww1, the bottom side ww2, and the height lp of the radiation patch unit 101 may be 20mm, 5mm, and 16mm, respectively. Wherein, the length of the bottom side determines the radiation resonance length of the monopole antenna.
As a specific embodiment, as shown in fig. 1, in the dual-band filtering antenna provided in the embodiment of the present application, based on the above, the size of the first microstrip feed line 103 is lt × w0 — 5.6mm × 1.7 mm; the second microstrip feed line 104 has a dimension l0 w0 of 5.2mm × 1.7 mm. Wherein, 1.7mm is the same width dimension of two microstrip feeder lines. Further, the microstrip feed line may employ a 50 Ω impedance matching standard.
Referring to fig. 2, fig. 2 is a schematic view of an underlying ground plate according to an embodiment of the present disclosure.
As a specific embodiment, as shown in fig. 2, in the dual-band filtering antenna provided in the embodiment of the present application, based on the above, the ground plane of the bottom layer includes a ground patch 201, and the ground patch 201 has a rectangular shape with rounded edges. The ground patch 201 in fig. 2, in which the edge portion is rounded to a curve, can further widen the impedance bandwidth, compared to a right angle in a standard rectangle. Furthermore, the two black dots on the ground patch 201 in fig. 2 are connection points to the ground point of the dual-band filter.
As a specific embodiment, the dual-band filtering antenna provided in the embodiment of the present application is based on the above, and the top of the ground patch 201 is provided with a concave groove for increasing the surface path of the current.
In one embodiment, the concave slot may be sized 2.6mm × 2.4mm and may be disposed in the top center of the ground patch 201. It should be noted that the number and position of the concave grooves are specially set by the applicant through the antenna electrostatic performance analysis, and the more the concave grooves are, the better the number is, otherwise, the electrostatic performance of the antenna is affected and the center frequency is shifted.
As a specific embodiment, in the dual-band filtering antenna provided in the embodiments of the present application, based on the above, the material of the dielectric substrate is Polydimethylsiloxane (PDMS). Its relative dielectric constant εr2.65, and the dielectric loss tangent tan θ is 0.02. The traces on the dielectric substrate are typically made of copper foil.
As a specific embodiment, the dual-band filtering antenna provided in the embodiments of the present application is based on the above, and the overall size of the top-layer radiating metal patch is L × W ═ 42.8mm × 64.4 mm. Further, its thickness dimension sub _ h is specifically 1 mm.
In the above embodiment, the detailed parameters of each dimension in fig. 1 and 2 are shown in table 1.
TABLE 1
In the following, taking the dual-band filtering antenna with the above-mentioned dimensions in table 1 as an example, the present application introduces the performance thereof through a specific test result diagram.
Referring to fig. 3, fig. 3 is a graph illustrating performance simulation of a dual-band filter 102 according to an embodiment of the present application. Wherein the curve S (1,1) is a return loss curve and the curve S (2,1) is an insertion loss curve.
As can be seen from fig. 3, the center frequencies of the two pass bands of the dual-band filter 102 are 2.4GHz and 5.6GHz, respectively, and the in-band and out-band characteristics of the filter are good. The minimum values of return loss in the two pass bands are-15.84 dB and-24.98 dB respectively, and are both smaller than-10 dB; the frequency band and the bandwidth of the return loss corresponding to-3 dB in the two pass bands are respectively 1.89-2.81 GHz, 920MHz and 5.33-5.80 GHz and 470 MHz. The minimum value of the insertion loss in the two pass bands is-1.6 dB and-2.07B respectively; the minimum value of the insertion loss in the whole frequency domain is-51.67 dB, -40.60dB and-43.66 dB respectively, and the isolation effect is good.
Referring to fig. 4, fig. 4 is a graph illustrating performance simulation curves of a dual-band filtering antenna according to an embodiment of the present application. Wherein the curve S (1,1) is a return loss curve and the curve S (2,1) is an insertion loss curve.
As can be seen from FIG. 4, the center frequencies of the two pass bands of the dual-band filtering antenna are respectively 2.4GHz and 5.6GHz, the operating frequency band and the bandwidth are respectively 2.22 GHz to 2.70GHz, the bandwidth is 480MHz, the bandwidth is 5.51 GHz to 5.86GHz, and the bandwidth is 350 MHz. In order to further examine the radiation characteristics of the antenna, the present application also provides the directional patterns of the antenna, as shown in fig. 5 and 6.
Fig. 5 is a radiation pattern of a dual-band filtering antenna provided in this embodiment of the present application when the antenna operates at 2.4 GHz. As shown in fig. 5, it appears as an "8" shape on the E-plane, i.e., the YOZ-plane; the film is circular in the H plane, i.e., XOZ plane, and exhibits good omniradial radiation properties.
Fig. 6 is a radiation pattern of a dual-band filtering antenna provided in this embodiment of the present application, which operates at 5 GHz. As shown in fig. 6, at the frequency point of 5.8GHz, the E-plane is slightly deformed, but still can be approximated to be "8" shaped, although not ideal as low frequency band, but also basically meets the design requirement of omnidirectional radiation.
The embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. For the equipment disclosed by the embodiment, the description is relatively simple because the equipment corresponds to the method disclosed by the embodiment, and the relevant parts can be referred to the method part for description.
It is further noted that, throughout this document, relational terms such as "first" and "second" are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Furthermore, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The technical solutions provided by the present application are described in detail above. The principles and embodiments of the present application are explained herein using specific examples, which are provided only to help understand the method and the core idea of the present application. It should be noted that, for those skilled in the art, without departing from the principle of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall into the protection scope of the present application.
Claims (10)
1. A dual-frequency filtering antenna is characterized by comprising a top radiation metal patch, a middle medium substrate and a bottom grounding plate; the top layer radiation metal patch comprises a radiation patch unit, a double-frequency filter, a first microstrip feeder line connected between the radiation patch unit and the output end of the double-frequency filter, and a second microstrip feeder line connected between the input end of the double-frequency filter and a signal feed point; the tail end of the second microstrip feeder line is the signal feed point of the antenna;
the input end and the output end of the double-frequency filter are a pair of parallel wires, and the double-frequency filter also comprises two U-shaped resonators and an E-shaped resonator; the two U-shaped resonators are arranged in a vertically coupled mode and coupled between the parallel wires to form a first pass band of the dual-frequency filter; the E-shaped resonator is also coupled between the parallel wires and arranged oppositely to the two U-shaped resonators to form a second pass band of the dual-frequency filter.
2. The dual-band filtering antenna of claim 1, wherein two of said U-shaped resonators are quarter-wave resonators, adjacent ends of both of said U-shaped resonators are grounded, and a center frequency of said first pass band is 2.4 GHz.
3. The dual-band filtering antenna of claim 2, wherein the middle stub of the E-shaped resonator is wider than the two side stubs and longer than the two side stubs, a rectangular impedance patch is loaded at the end of the middle stub, and the center frequency of the second pass band is 5 GHz.
4. The dual-band filtering antenna of claim 1, wherein the radiating patch element is an inverted trapezoid.
5. The dual-band filtering antenna of claim 4, wherein the top side length, the bottom side length and the height of the radiating patch unit are 20mm, 5mm and 16mm respectively.
6. The dual-band filtered antenna of claim 5, wherein the first microstrip feed line has dimensions of 5.6mm x 1.7 mm; the size of the second microstrip feeder line is 5.2mm multiplied by 1.7 mm.
7. The dual-band filtering antenna of claim 1, wherein said underlying ground plane comprises a ground patch, said ground patch having a substantially rectangular shape with rounded edges.
8. The dual-band filtering antenna of claim 7, wherein said ground patch has a concave groove on its top for increasing a current surface path.
9. The dual-band filtering antenna of any one of claims 1 to 8, wherein the dielectric substrate is polydimethylsiloxane.
10. The dual-band filtering antenna of claim 9, wherein the top radiating metal patch has overall dimensions of 42.8mm x 64.4 mm.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114583441A (en) * | 2022-04-01 | 2022-06-03 | 维沃移动通信有限公司 | Antenna structure and electronic device |
| CN115621743A (en) * | 2022-11-17 | 2023-01-17 | 中南大学 | Double-frequency filtering type linear polarization converter |
-
2020
- 2020-11-27 CN CN202022793228.4U patent/CN213483978U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114583441A (en) * | 2022-04-01 | 2022-06-03 | 维沃移动通信有限公司 | Antenna structure and electronic device |
| CN115621743A (en) * | 2022-11-17 | 2023-01-17 | 中南大学 | Double-frequency filtering type linear polarization converter |
| CN115621743B (en) * | 2022-11-17 | 2023-04-07 | 中南大学 | Double-frequency filtering type linear polarization converter |
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Effective date of registration: 20221221 Address after: 266104 No. 500, Songling Road, Laoshan District, Qingdao, Shandong Patentee after: GOERTEK TECHNOLOGY Co.,Ltd. Address before: 261031 north of Yuqing street, east of Dongming Road, high tech Zone, Weifang City, Shandong Province (Room 502, Geer electronics office building) Patentee before: GoerTek Optical Technology Co.,Ltd. |
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