CN109818144B - Broadband filtering patch antenna based on partial reflection surface - Google Patents
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- CN109818144B CN109818144B CN201910210986.8A CN201910210986A CN109818144B CN 109818144 B CN109818144 B CN 109818144B CN 201910210986 A CN201910210986 A CN 201910210986A CN 109818144 B CN109818144 B CN 109818144B
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- 230000005855 radiation Effects 0.000 claims abstract description 4
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- 229910052802 copper Inorganic materials 0.000 description 2
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Abstract
The invention discloses a broadband filter patch antenna based on a partial reflection surface, which comprises a first dielectric plate, a second dielectric plate and a third dielectric plate which are sequentially arranged in an up-down sequence, wherein a first air layer is arranged between the first dielectric plate and the second dielectric plate, and a second air layer is arranged between the second dielectric plate and the third dielectric plate; the upper surface of the first dielectric plate is provided with a grounding plate with a coupling aperture, the lower surface of the first dielectric plate is provided with a first copper-clad layer with a T-shaped feeder line, a first tuning branch and a second tuning branch, the first dielectric plate is provided with an input port, the upper surface of the second dielectric plate is provided with a second copper-clad layer with a rectangular patch, the rectangular patch is a main radiation source of the whole antenna, the upper surface of the third dielectric plate is provided with a third copper-clad layer with a circular patch array, and the circular patch array is used as a partial reflection surface to improve the bandwidth of the antenna. The whole antenna of the invention has simple processing, light weight, low cost, wide working bandwidth and good application prospect.
Description
Technical Field
The invention relates to the technical field of antennas, in particular to a broadband filter patch antenna based on a partial reflection surface.
Background
With the advent of the fifth generation communication system, there is a higher demand for the communication capacity and transmission rate of the system due to the rapid development of wireless communication in recent years. Patch antennas are widely used in wireless communication systems because of their light weight, small size, easy conformality, easy processing, low cost, etc. However, microstrip patch antennas are often limited by their operating bandwidth being too narrow. For bandwidth expansion of patch antennas, students are continually improved and researched to provide expansion technologies of a plurality of patch antennas. However, some methods have problems such as reduced efficiency, reduced gain, unstable pattern, etc. In addition, many broadband antennas do not have a filtering function.
The prior art is investigated and known, and the specific steps are as follows:
li Qifang professor and the schduler research have proposed loading U-slots to widen the bandwidth in 1995. The loading of the U-shaped slot causes the patch to form a multi-tuned circuit, thereby widening the frequency band. The latter widening of the bandwidth by many loading slots is also based on this principle.
The design approach of "Aperture-Stacked Patch" (Aperture-Stacked Patch) was proposed by tarmonski et al to widen the bandwidth.
In general, there are many studies on expanding the broadband of patch antennas in the existing work, but many designs make the antenna loss large and the efficiency low. Or the bandwidth is widened by forming a multi-tuning loop by a slot adding method and the like, but the gain and the waveform of the antenna are affected. Many approaches to expanding bandwidth do not suggest how filtering functions can be added. Therefore, the design of a simple high-gain broadband filter patch antenna has important significance.
Disclosure of Invention
The invention aims to overcome the defects and shortcomings of the prior art and provides a broadband filtering patch antenna based on a partial reflection surface, which can stably work in the range of 1.85GHz-4.03GHz and can stably work in the range of 1.85GHz-4.03GHz in S 11 <10dB, and the gain in the frequency range of 1.85GHz-4.03GHz is kept about 8.5dB, the whole antenna has simple structure, convenient processing and low cost.
In order to achieve the above purpose, the technical scheme provided by the invention is as follows: the broadband filter patch antenna based on the partial reflection surface comprises three layers of dielectric plates, namely a first dielectric plate, a second dielectric plate and a third dielectric plate, wherein the second dielectric plate is positioned above the first dielectric plate, and the third dielectric plate is positioned above the second dielectric plate; a first air layer is formed between the first dielectric plate and the second dielectric plate, and a second air layer is formed between the second dielectric plate and the third dielectric plate; the upper surface of the first dielectric plate is provided with a grounding plate, the lower surface of the first dielectric plate is provided with a first copper-clad layer, the grounding plate is provided with a coupling aperture, the first copper-clad layer is respectively provided with a T-shaped feeder line, a first tuning branch knot and a second tuning branch knot, the first tuning branch knot and the second tuning branch knot are positioned at two sides of the vertical side of the T-shaped feeder line, the first tuning branch knot and the second tuning branch knot are added through the T-shaped feeder line to introduce two resonance modes to expand the bandwidth, meanwhile, the first tuning branch knot is equivalent to a short circuit point at 4.6GHz to form a transmission zero point, the second tuning branch knot is equivalent to a short circuit point at 1.76GHz to form a transmission zero point, so that the filtering function is realized, and the first dielectric plate is provided with an input port through which the whole antenna is fed; the upper surface of the second dielectric plate is provided with a second copper-clad layer, a rectangular patch is arranged on the second copper-clad layer and used as a main radiation source of the whole antenna, and the T-shaped feeder feeds the rectangular patch through a coupling aperture; the upper surface of third dielectric plate is provided with the third and covers the copper layer, be provided with circular paster array on the third and cover the copper layer, as partial reflecting surface, improve the bandwidth of antenna.
Further, the circular patch array is a 6×6 circular patch array.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. the working frequency of the broadband filter patch antenna is in a frequency range of more than 1.85GHz-4.03GHz, and the relative bandwidth is more than 74%.
2. The broadband filter patch antenna has very flat gain in the frequency range of 1.85GHz-4.03GHz and is stable in the range of about 8.5 dB.
3. The directional diagram of the broadband filter patch antenna generates transmission zero points at two frequency points of 1.76GHz and 4.6GHz, and realizes the filter function.
4. The directional diagram of the broadband filter patch antenna has good characteristics in the frequency range of 1.85GHz-4.03 GHz.
5. The broadband filter patch antenna disclosed by the invention is simple to process, light in weight, low in processing cost, wide in working bandwidth and good in application prospect.
Drawings
Fig. 1 is a perspective view of a partially reflective surface based wideband filtered patch antenna of the present invention.
Fig. 2 is a side view of a partially reflective surface based wideband filtered patch antenna of the present invention.
Fig. 3 is a schematic structural view of a third dielectric plate.
Fig. 4 is a schematic structural view of a second dielectric plate.
Fig. 5 is a schematic structural diagram of a first dielectric plate.
FIG. 6 shows the reflection coefficient S of a partially reflective surface-based broadband filter patch antenna of the present invention 11 Simulation results and a simulation result graph of the gain curve.
FIG. 7 is a graph of simulation results of the patterns of the various frequency points of the wideband filtered patch antenna based on partially reflective surfaces of the present invention; in the figure, (a) the E plane when the frequency is 2 GH; (b) at a frequency of 2GHz, an H face; (c) at a frequency of 2.5GHz, the E-plane; (d) at a frequency of 2.5GHz, an H-plane; (E) at a frequency of 3GHz, the E-plane; (f) at a frequency of 3GHz, H face; (g) E-plane at 3.5 GHz; (H) at a frequency of 3.5GHz, H face; (i) at a frequency of 4GHz, an E-plane; (j) H face at 4GHz frequency.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clear and clear, the present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Referring to fig. 1 to 5, the broadband filter patch antenna based on a partially reflective surface provided in this embodiment includes three dielectric plates, namely, a first dielectric plate 1, a second dielectric plate 2 and a third dielectric plate 3, where the second dielectric plate 2 is located above the first dielectric plate 1, and the third dielectric plate 3 is located above the second dielectric plate 1; a first air layer 8 is formed between the first dielectric plate 1 and the second dielectric plate 2, and a second air layer 9 is formed between the second dielectric plate 2 and the third dielectric plate 3; the upper surface of the first dielectric plate 1 is provided with a grounding plate 5, the lower surface of the first dielectric plate 1 is provided with a first copper-clad layer 4, the grounding plate 5 is provided with a coupling aperture 12, the first copper-clad layer 4 is respectively provided with a T-shaped feeder 13, a first tuning branch 14 and a second tuning branch 15, the first tuning branch 14 and the second tuning branch 15 are positioned at two sides of the vertical side of the T-shaped feeder 13, the first tuning branch 14 and the second tuning branch 15 are added through the T-shaped feeder 13 to introduce two resonance modes to expand bandwidth, meanwhile, the first tuning branch 14 is equivalent to a short circuit point at 4.6GHz to form a transmission zero point, the second tuning branch 15 is equivalent to a short circuit point at 1.76GHz to form a transmission zero point, so that a filtering function is realized, the first dielectric plate 1 is provided with an input port 16, and the whole antenna is fed through the input port 16; the upper surface of the second dielectric plate 2 is provided with a second copper-clad layer 6, the second copper-clad layer 6 is provided with a rectangular patch 11 as a main radiation source of the whole antenna, and the T-shaped feeder line 13 feeds the rectangular patch 11 through a coupling aperture 12; the upper surface of the third dielectric plate 3 is provided with a third copper-clad layer 7, the third copper-clad layer 7 is provided with a 6×6 circular patch array 10, the diameter of each circular patch is 10mm, the circle centers of every two adjacent circular patches are 10.2mm apart, namely, the distance between every two adjacent circular patches is 0.2mm, and the main purpose of the 6×6 circular patch array 10 is to serve as a similar partial reflection surface, so that the bandwidth of the antenna is improved.
The dielectric constants of the first dielectric plate 1, the second dielectric plate 2, and the third dielectric plate 3 were 2.55, and the loss tangent was 0.0029. The thickness of the first dielectric plate 1, the second dielectric plate 2 and the third dielectric plate 3 is 1.5 mm; the first air layer 8 has a thickness of 9mm and the second air layer 9 has a thickness of 11mm, the first air layer 8 has a main function of reducing the coupling of the rectangular patch 11 and the coupling aperture 12, and a frequency interval in which a resonance mode caused by the rectangular patch 11 and a resonance mode caused by the coupling aperture are separated is slightly larger, and the second air layer 9 has a main function of improving gain and bandwidth.
Referring to FIG. 6, the reflection coefficient S of the wideband filter patch antenna based on the partially reflective surface according to the present embodiment is shown 11 And the simulation result of the gain curve, from the simulation result, it can be seen that the reflection coefficient |S 11 |<The frequency range of-10 dB exceeds the frequency interval of 1.85GHz-4.03 GHz. The relative bandwidth exceeds 74%. As can be seen from the simulation result graph, the gain is flat and kept in the frequency range of 2GHz-4GHzAbout 8.5 dB.
Referring to fig. 7, a simulation pattern of the wideband filter patch antenna based on the partially reflective surface at five frequency points of 2GHz, 2.5GHz, 3GHz, 3.5GHz and 4GHz according to the present embodiment is shown, and from the simulation result, it can be seen that the pattern of the antenna according to the present invention can meet the required characteristics at 2GHz-4 GHz.
The above examples are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above examples, and any other changes, modifications, substitutions, combinations, and simplifications that do not depart from the spirit and principle of the present invention should be made in the equivalent manner, and the embodiments are included in the protection scope of the present invention.
Claims (2)
1. The broadband filter patch antenna based on the partial reflection surface comprises three layers of dielectric plates, namely a first dielectric plate, a second dielectric plate and a third dielectric plate, wherein the second dielectric plate is positioned above the first dielectric plate, and the third dielectric plate is positioned above the second dielectric plate; the method is characterized in that: a first air layer is formed between the first dielectric plate and the second dielectric plate, and a second air layer is formed between the second dielectric plate and the third dielectric plate; the upper surface of the first dielectric plate is provided with a grounding plate, the lower surface of the first dielectric plate is provided with a first copper-clad layer, the grounding plate is provided with a coupling aperture, the first copper-clad layer is respectively provided with a T-shaped feeder line, a first tuning branch knot and a second tuning branch knot, the first tuning branch knot and the second tuning branch knot are positioned at two sides of the vertical side of the T-shaped feeder line, the first tuning branch knot and the second tuning branch knot are added through the T-shaped feeder line to introduce two resonance modes to expand the bandwidth, meanwhile, the first tuning branch knot is equivalent to a short circuit point at 4.6GHz to form a transmission zero point, the second tuning branch knot is equivalent to a short circuit point at 1.76GHz to form a transmission zero point, so that the filtering function is realized, and the first dielectric plate is provided with an input port through which the whole antenna is fed; the upper surface of the second dielectric plate is provided with a second copper-clad layer, a rectangular patch is arranged on the second copper-clad layer and used as a main radiation source of the whole antenna, and the T-shaped feeder feeds the rectangular patch through a coupling aperture; the upper surface of the third dielectric plate is provided with a third copper-clad layer, and the third copper-clad layer is provided with a circular patch array which is used as a partial reflection surface to improve the bandwidth of the antenna; the first air layer serves to reduce the coupling between the rectangular patch and the coupling aperture, to increase the frequency interval between the resonant mode induced by the rectangular patch and the resonant mode induced by the coupling aperture, and the second air layer serves to improve the gain and bandwidth.
2. A partially reflective surface based wideband filtered patch antenna as recited in claim 1, wherein: the circular patch array is a 6 x 6 circular patch array.
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| CN201910210986.8A CN109818144B (en) | 2019-03-20 | 2019-03-20 | Broadband filtering patch antenna based on partial reflection surface |
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| CN201910210986.8A CN109818144B (en) | 2019-03-20 | 2019-03-20 | Broadband filtering patch antenna based on partial reflection surface |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2329091Y (en) * | 1998-06-12 | 1999-07-14 | 庄昆杰 | Broad band microstrip array antenna unit |
| CN105720364A (en) * | 2016-04-06 | 2016-06-29 | 华南理工大学 | Dual-polarized filter antenna with high selectivity and low cross polarization |
| CN107834176A (en) * | 2017-11-16 | 2018-03-23 | 西安电子科技大学 | A kind of narrow beam H-shaped slot-coupled Section of Microstrip Antenna Array |
| CN109066072A (en) * | 2018-07-12 | 2018-12-21 | 南通大学 | Wideband filtered antenna |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017148237A1 (en) * | 2016-02-29 | 2017-09-08 | 华南理工大学 | Low profile, broadband and high-gain filter antenna |
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2019
- 2019-03-20 CN CN201910210986.8A patent/CN109818144B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2329091Y (en) * | 1998-06-12 | 1999-07-14 | 庄昆杰 | Broad band microstrip array antenna unit |
| CN105720364A (en) * | 2016-04-06 | 2016-06-29 | 华南理工大学 | Dual-polarized filter antenna with high selectivity and low cross polarization |
| CN107834176A (en) * | 2017-11-16 | 2018-03-23 | 西安电子科技大学 | A kind of narrow beam H-shaped slot-coupled Section of Microstrip Antenna Array |
| CN109066072A (en) * | 2018-07-12 | 2018-12-21 | 南通大学 | Wideband filtered antenna |
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