CN211578982U - Novel double-layer multi-frequency broadband microstrip antenna - Google Patents
Novel double-layer multi-frequency broadband microstrip antenna Download PDFInfo
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- CN211578982U CN211578982U CN202020396768.6U CN202020396768U CN211578982U CN 211578982 U CN211578982 U CN 211578982U CN 202020396768 U CN202020396768 U CN 202020396768U CN 211578982 U CN211578982 U CN 211578982U
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Abstract
The utility model discloses a novel double-deck multifrequency broadband microstrip antenna belongs to antenna technical field. The radiating patch of each layer is arranged on the upper surface of the respective dielectric substrate, wherein the upper layer radiating patch consists of two parts which are symmetrical about a horizontal central line, each part consists of two units which are symmetrical about a vertical central line, and each unit consists of two units which are symmetrical about a vertical central lineThe element is composed of a plurality of rectangular patches constituting an L-shape. The lower radiation patch is provided with a patch groove, the patch groove is positioned right below the upper radiation patch, and the shape of the patch groove is consistent with that of the upper radiation patch. The utility model discloses a mode of coaxial feed, feed point set up in the lower right corner of lower floor's radiation paster, arouse the TM simultaneously01Mode and TM10The mode realizes working at a plurality of frequency bands, and simultaneously return loss and standing wave both achieve better effects.
Description
Technical Field
The utility model belongs to the technical field of the antenna, specifically speaking relates to a novel double-deck multifrequency broadband microstrip antenna.
Background
In wireless communication systems, antennas occupy a significant position. The essence of the antenna is that under the basic principle of an electromagnetic field, the radiation and the reception of electromagnetic energy are completed through the mutual conversion of the electric field and the magnetic field. In response to the demands of modern communication devices, antenna development is mainly directed to size reduction, broadband and multiband operation, and the like.
The microstrip antenna is a low-profile antenna, and has many advantages, such as flexible structure, easy processing, and low cost. However, the common microstrip patch antenna is limited by narrow frequency band, large loss and insufficient maximum gain, so that it has important significance to expand the working frequency band of the microstrip antenna.
The microstrip antenna also has a fixed multi-frequency characteristic, namely the same microstrip antenna can work on a plurality of discrete frequency working points, and the requirement of a plurality of communication frequency bands is met. Taking a coaxial feeding microstrip antenna as an example, in the design, a plurality of layers of metal sheets, rectangular metal sheets with slotted hole loads, square metal sheets with rectangular notches, metal sheets with short gold loads, rectangular metal sheets fed in by coupling of inclined slotted holes and the like are used, and feeding is performed from one diagonal corner of a rectangular radiation patch, so that the same radiation patch can work at two frequencies, and a multi-frequency effect is easy to generate. And the position of the feed point can be flexibly selected in the coaxial feed mode, the joint is arranged at the bottom of the patch, and the ground plate enables the influence of the feed line on the antenna to be small.
Disclosure of Invention
To the above-mentioned problem that prior art exists, the utility model aims to provide a novel multifrequency broadband microstrip antenna makes near microstrip antenna central frequency's bandwidth obtain widening, has obvious gain simultaneously.
In order to solve the above problems, the utility model adopts the following technical proposal.
A novel double-layer multi-frequency broadband microstrip antenna comprises an upper-layer dielectric substrate, a lower-layer dielectric substrate and a ground plate from top to bottom, wherein an upper-layer radiation patch is arranged on the upper-layer dielectric substrate, a lower-layer radiation patch is arranged on the lower-layer dielectric substrate, the upper-layer radiation patch comprises a first combination patch, a second combination patch, a first connection patch and a second connection patch, the first combination patch and the second combination patch are connected through the first connection patch and the second connection patch, the first combination patch and the second combination patch are symmetrical about the horizontal central line of the upper-layer dielectric substrate, and the first combination patch and the second combination patch are symmetrical about the vertical central line of the upper-layer dielectric substrate;
the first combined patch comprises a first patch which is parallel to the horizontal center line of the upper-layer dielectric substrate and is connected with the first combined patch and the second combined patch simultaneously, a second patch is vertically arranged in the middle of the first patch, a third patch is horizontally arranged at the front end of the second patch, a fourth patch is vertically and downwardly arranged at the front end of the third patch, a fifth patch is horizontally and inwardly arranged at the front end of the fourth patch, a sixth patch is vertically and upwardly arranged at the front end of the fifth patch, and a seventh patch, an eighth patch, a ninth patch and a tenth patch are respectively symmetrical to the third patch, the fourth patch, the fifth patch and the sixth patch with respect to the second patch;
the lower radiation patch is provided with a patch groove, the patch groove is positioned right below the upper radiation patch, and the shape of the patch groove is consistent with that of the upper radiation patch;
the lower dielectric substrate is provided with a coaxial feed through hole penetrating through the lower dielectric substrate.
Further, the length of the notch of the patch slot is the same as that of the upper-layer radiation patch, and the width of the notch is half of that of the upper-layer radiation patch.
Further, the coaxial feed through hole is arranged at the lower right corner of the lower dielectric substrate.
Furthermore, the ground plate is provided with a circular cut hole below the coaxial feed through hole, and the radius of the circular cut hole is larger than that of the coaxial feed through hole.
Further, the coaxial feed through hole adopts 50 ohm coaxial line feed.
Furthermore, the upper layer radiation patch, the lower layer radiation patch and the grounding plate are all made of copper.
Furthermore, the upper dielectric substrate and the lower dielectric substrate are both made of epoxy resin with a relative dielectric coefficient of 4.4.
Compared with the prior art, the utility model discloses with the rectangle radiation paster fluting on the medium base plate of lower floor, can have obvious gain simultaneously increasing the bandwidth, play the balance effect, adhere to the radiation paster with the same shape of lower floor's radiation paster notch on double-deck structure and the upper medium base plate simultaneously, improved the return loss curve on original basis. The utility model discloses a coaxial feeder inner core, ground plate, upper radiation paster, lower floor radiation paster have realized the effect of broadband, adopt coaxial feed and feed point to select in the right lower corner department of lower floor radiation paster, arouse TM simultaneously01Mode and TM10The mode resonates at 11.6GHz, 12.8GHz and 15.8GHz respectively, and simultaneously return loss and standing wave both achieve better effects.
Drawings
Fig. 1 is a schematic structural view of a dual-layer multi-frequency broadband microstrip antenna of the present invention;
fig. 2 is a schematic top view of the upper layer of the dual-layer multi-frequency broadband microstrip antenna of the present invention;
fig. 3 is a schematic top view of the lower layer of the dual-layer multi-frequency broadband microstrip antenna of the present invention;
fig. 4 is a schematic back view of the dual-layer multi-frequency broadband microstrip antenna of the present invention;
in FIGS. 1 to 4: 1. an upper dielectric substrate; 2. a lower dielectric substrate; 3. a lower radiation patch; 301. a patch slot; 4. an upper radiation patch; 5. a coaxial feed through hole; 6. circular hole cutting; 7. a ground plate; 401. a first combination patch; 402. a second composite patch; 403. a first connection patch; 404. a second connection patch; 4011. a first patch; 4012. a second patch; 4013A, a third patch; 4014A, fourth patch; 4015A, fifth patch; 4016A, sixth patch; 4013B, seventh patch; 4014B, eighth patch; 4015B, ninth patch; 4016B, tenth patch.
FIG. 5 is a return loss simulation of the antenna;
FIG. 6 is a plot of the standing wave ratio (VSWR) of the antenna;
FIG. 7 is the E-plane and H-plane patterns for the antenna 11.6 GHz;
FIG. 8 is a 3D pattern for antenna 11.6 GHz;
FIG. 9 is the E-plane and H-plane patterns for the antenna 12.8 GHz;
FIG. 10 is a 3D pattern for antenna 12.8 GHz;
FIG. 11 is the E-plane and H-plane patterns for the antenna 15.8 GHz;
fig. 12 is a 3D pattern for antenna 15.8 GHz.
Detailed Description
The present invention will be further described with reference to the following specific embodiments.
The utility model provides a novel double-deck multifrequency broadband microstrip antenna, as figure 1, top-down includes upper dielectric substrate 1, lower floor's dielectric substrate 2 and ground plate 7, and upper dielectric substrate 1 and lower floor's dielectric substrate 2 are the insulating medium layer of cube shape, and the upper surface of upper dielectric substrate 1 is equipped with upper radiation paster 4, and the upper surface of lower floor's dielectric substrate 2 is equipped with lower floor's radiation paster 3. As shown in fig. 2, the upper radiation patch 4 includes a first combined patch 401, a second combined patch 402, a first connection patch 403, and a second connection patch 404, the first combined patch 401 and the second combined patch 402 are connected by the first connection patch 403 and the second connection patch 404, the first combined patch 401 and the second combined patch 402 are symmetrical with respect to a horizontal central line of the upper dielectric substrate 1, and the first combined patch 401 and the second combined patch 402 are symmetrical with respect to a vertical central line of the upper dielectric substrate 1.
The first combined patch 401 comprises a first patch 4011 which is parallel to the horizontal center line of the upper layer dielectric substrate 1 and is simultaneously connected with the first combined patch 401 and the second combined patch 402, a second patch 4012 is vertically arranged in the middle of the first patch 4011, a third patch 4013A is horizontally arranged at the front end of the second patch 4012, a fourth patch 4014A is vertically arranged at the front end of the third patch 4013A downwards, a fifth patch 4015A is horizontally and inwards arranged at the front end of the fourth patch 4014A (the direction facing the second patch 4012 is inwards), a sixth patch 4016A is vertically and upwards arranged at the front end of the fifth patch 4015A, a seventh patch 4013B, an eighth patch 4014B, a ninth patch 4015B, a tenth patch 4016B are respectively symmetrical to the third patch 4013A, the fourth patch 4014A, the fifth patch 4015A and the sixth patch 4016A relative to the second patch 4012, wherein the rectangular patches are symmetrical to the tenth patches 4012, the foregoing "horizontal", "vertical", "upward" and "downward" are all expressed in the perspective of fig. 2.
As shown in fig. 3, a patch slot 301 is provided on the lower radiation patch 3, the patch slot 301 is located right below the upper radiation patch 4, and has a shape consistent with that of the upper radiation patch 4, the length of the slot opening of the patch slot 301 is the same as that of the upper radiation patch 4, and the width of the slot opening is half of that of the upper radiation patch 4.
The lower right corner of the lower dielectric substrate 2 is provided with a coaxial feed through hole 5 penetrating through the lower dielectric substrate 2, as shown in fig. 4, a circular cut hole 6 is formed in the ground plate 7 below the coaxial feed through hole 5, the circle center of the circular cut hole 6 coincides with the circle center of the coaxial feed through hole 5, and the radius of the circular cut hole is larger than that of the coaxial feed through hole 5 and used for grounding a feeder line.
Examples
In this embodiment, the upper radiation patch 4, the lower radiation patch 3, and the ground plate 7 are made of copper, and the upper dielectric substrate 1 and the lower dielectric substrate 2 are made of epoxy resin having a relative permittivity of 4.4.
The length of the lower dielectric substrate 2 is 55.8mm, the width is 74.52mm, and the height is 1.6 mm; the upper dielectric substrate 1 is 51.8mm long, 70.52mm wide and 1.6mm high; the length of the lower radiation patch 3 is 28mm, and the width is 37.26 mm; the radius of the coaxial feed through hole 5 is 0.6mm, the coaxial feed through hole is positioned at the lower right corner of the lower dielectric substrate 2, the horizontal direction from the center of the lower dielectric substrate 2 is 7mm, and the vertical direction is 9.34 mm; the radius of the circular cutting hole 6 is 1.5 mm; the length of the grounding plate 7 is 55.8mm, and the width is 74.52 mm; the first patch 4011 has a length of 34.26mm and a width of 1 mm; the second patch 4012 has a length of 11.45mm and a width of 1 mm; the third patch 4013A, the fourth patch 4014A, the seventh patch 4013B, and the eighth patch 4014B have a length of 8.31mm and a width of 1 mm; the sixth patch 4016A and the tenth patch 4016B have a length of 4.66mm and a width of 1 mm; the fifth patch 4015A and the ninth patch 4015B have a length of 2.61mm and a width of 1 mm; the first connection patch 403 and the second connection patch 404 have a length of 2mm and a width of 1 mm.
The coaxial feed via 5 is fed using a 50 ohm coaxial line.
The working principle is as follows: this double-deck multifrequency broadband microstrip antenna main part is two insulation medium layers that are far less than operating wavelength of upper strata lower floor, wherein at the additional rectangle radiation paster that is equipped with the paster groove of lower floor medium base plate upper surface, can have obvious gain simultaneously increasing the bandwidth, play the trade-off effect, adhere to the radiation paster with the same shape of lower floor radiation paster notch on the upper dielectric base plate simultaneously, improved the return loss curve on original basis, also widened the bandwidth, realize the broadband effect. According to the cavity model theory, the lower right corner of the lower radiation patch is selected through coaxial feeding and a feeding point, and TM is excited simultaneously01Mode and TM10Mode, resonance at 11.6GHz, 12.8GHz and 15.8GHz, and return loss at resonance point at S11Less than-10 dB and voltage standing wave ratio VSWR<2 the performance matching is good, and the effect is reasonable and practical.
By performing HFSS simulation on the antenna structure of the present embodiment, various performance indexes of the antenna are tested, and the return loss, the directional diagram, and the 3D gain diagram of the antenna are derived (fig. 5 to 12).
As shown in fig. 5, the return loss and the vswr of the antenna are in one-to-one correspondence, and in general, the vswr is 2, the return loss is-10 dB, and the return loss is lower than 10dB when the vswr is less than 2. The return loss effect of the antenna is lower than 10dB, and it is concluded that the antenna has a good bandwidth and a plurality of frequency bands.
The multi-frequency broadband microstrip antenna of the embodiment adopts the coaxial feeder inner core to perform coaxial feeding, as shown in fig. 6, the radiation patches are added at the proper positions of the two layers of dielectric substrates, and the diagonal feeding of the grounding plate resonates at 11.6GHz, 12.8GHz and 15.8GHz, so that the multi-frequency effect is realized;
wherein, in the frequency band with 12.8GHz as resonance frequency, when S11When equal to-10 dB, fL＝9.512GHz，fH14.316GHz at fLAnd fHM, S11When < -10dB, the absolute bandwidth B of the antenna is fH-fL＝4.804GHz；；
And in the frequency band of 15.8GHz as the resonance frequency, when S is11When equal to-10 dB, fL＝14.695GHz，fH17.383GHz at fLAnd fHM, S11When < -10dB, the absolute bandwidth B of the antenna is fH-fL＝2.688GHz。
As shown in fig. 7 and 8, the return loss frequency is 11.6GHz, the gain diagram of the E-plane is butterfly-shaped, the main gain of the H-plane is in the 60 ° direction, and the gain is 4.545dB at most; as shown in fig. 9 and 10, the return loss frequency is 12.8GHz, the gain diagram of the E-plane is in a petal shape, the main gain of the H-plane is in the 60 ° direction, the maximum gain is 5.315dB, and the radiation effect is good; as shown in fig. 11 and 12, the gain diagram of the E-plane is butterfly-shaped with a maximum gain of 5.1996dB at a return loss frequency of 15.8 GHz; from the 3D gain pattern of these several frequencies it can be seen visually that there is a significant increase in radiation intensity and at S11Less than-10 dB, each frequency point can realize the effect of multifrequency, the working performance is good, and the effect on return loss is excellent, thereby having practicability.
Claims (7)
1. The utility model provides a novel double-deck multifrequency broadband microstrip antenna, top-down includes upper dielectric substrate (1), lower floor dielectric substrate (2) and ground plate (7), be equipped with upper radiation paster (4) on upper dielectric substrate (1), be equipped with lower floor radiation paster (3) on lower floor dielectric substrate (2), its characterized in that, upper radiation paster (4) include first combination paster (401), second combination paster (402), first connection paster (403) and second connection paster (404), first combination paster (401) with connect through first connection paster (403) and second connection paster (404) between second combination paster (402), first combination paster (401) with second combination paster (402) about the horizontal central line symmetry of upper dielectric substrate (1), first combination paster (401) with second combination paster (402) about the vertical central line of upper dielectric substrate (1) is connected The middle lines are symmetrical;
the first combined patch (401) comprises a first patch (4011) which is parallel to the horizontal central line of the upper layer dielectric substrate (1) and is connected with the first combined patch (401) and the second combined patch (402), a second patch (4012) is vertically arranged in the middle of the first patch (4011), a third patch (4013A) is horizontally arranged at the front end of the second patch (4012), a fourth patch (4014A) is vertically and downwardly arranged at the front end of the third patch (4013A), a fifth patch (4015A) is horizontally and inwardly arranged at the front end of the fourth patch (4014A), a sixth patch (4016A) is vertically and upwardly arranged at the front end of the fifth patch (4015A), a seventh patch (4013B), an eighth patch (4014B), a ninth patch (4015B), a tenth patch (4016B) and the third patch (4013A), A fourth patch (4014A), a fifth patch (4015A), a sixth patch (4016A) are symmetric about the second patch (4012);
a patch groove (301) is formed in the lower radiation patch (3), the patch groove (301) is located right below the upper radiation patch (4), and the shape of the patch groove is consistent with that of the upper radiation patch (4);
the lower dielectric substrate (2) is provided with a coaxial feed through hole (5) penetrating through the lower dielectric substrate (2).
2. The novel dual-layer multi-frequency broadband microstrip antenna according to claim 1, wherein the slot (301) has a slot length equal to that of the upper radiation patch (4) and a slot width half of that of the upper radiation patch (4).
3. The novel dual-layer multi-frequency broadband microstrip antenna according to claim 1, wherein said coaxial feed via (5) is disposed at the lower right corner of said lower dielectric substrate (2).
4. The novel double-layer multi-frequency broadband microstrip antenna according to claim 1, wherein the ground plate (7) is provided with a circular cut hole (6) below the coaxial feed through hole (5), and the radius of the circular cut hole (6) is larger than that of the coaxial feed through hole (5).
5. The novel double-layer multi-frequency broadband microstrip antenna according to any one of claims 1, 3 or 4, wherein the coaxial feed via (5) is fed by a 50 ohm coaxial line.
6. The novel double-layer multi-frequency broadband microstrip antenna according to claim 1, wherein the upper radiation patch (4), the lower radiation patch (3) and the ground plate (7) are all made of copper.
7. The novel double-layer multi-frequency broadband microstrip antenna according to claim 1 or 6, wherein the upper dielectric substrate (1) and the lower dielectric substrate (2) are both made of epoxy resin with a relative dielectric coefficient of 4.4.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020396768.6U CN211578982U (en) | 2020-03-25 | 2020-03-25 | Novel double-layer multi-frequency broadband microstrip antenna |
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| CN202020396768.6U CN211578982U (en) | 2020-03-25 | 2020-03-25 | Novel double-layer multi-frequency broadband microstrip antenna |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114094326A (en) * | 2021-11-04 | 2022-02-25 | 天津大学 | UWB antenna gain improvement structure for WLAN applications |
| CN116111339A (en) * | 2023-04-12 | 2023-05-12 | 华南理工大学 | Multi-band tag antenna |
| US11862868B2 (en) | 2021-12-20 | 2024-01-02 | Industrial Technology Research Institute | Multi-feed antenna |
-
2020
- 2020-03-25 CN CN202020396768.6U patent/CN211578982U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114094326A (en) * | 2021-11-04 | 2022-02-25 | 天津大学 | UWB antenna gain improvement structure for WLAN applications |
| US11862868B2 (en) | 2021-12-20 | 2024-01-02 | Industrial Technology Research Institute | Multi-feed antenna |
| CN116111339A (en) * | 2023-04-12 | 2023-05-12 | 华南理工大学 | Multi-band tag antenna |
| CN116111339B (en) * | 2023-04-12 | 2023-06-09 | 华南理工大学 | Multi-band tag antenna |
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