CN119481716A - A miniaturized slot-coupled microstrip filter antenna - Google Patents
A miniaturized slot-coupled microstrip filter antenna Download PDFInfo
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- CN119481716A CN119481716A CN202411664386.6A CN202411664386A CN119481716A CN 119481716 A CN119481716 A CN 119481716A CN 202411664386 A CN202411664386 A CN 202411664386A CN 119481716 A CN119481716 A CN 119481716A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
- H01Q9/045—Substantially flat resonant element parallel to ground plane, e.g. patch antenna with particular feeding means
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
- H01Q9/0414—Substantially flat resonant element parallel to ground plane, e.g. patch antenna in a stacked or folded configuration
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
- H01Q9/0442—Substantially flat resonant element parallel to ground plane, e.g. patch antenna with particular tuning means
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Abstract
本发明公开一种小型化槽耦合馈电微带滤波天线，该天线包括从下至上依次设置的下介质板、金属地板、上介质板，以及位于下介质板下表面的馈电网络，位于上介质板上表面的辐射网络；辐射网络为轴对称结构，其包括一个主贴片、两个从贴片、两个Z型微带枝节；金属地板开有条形地板耦合缝隙；条形地板耦合缝隙位于主贴片的正下方；馈电网络包括主馈线和开路枝节。馈电网络通过地板上的条形地板耦合缝隙对上层辐射网络进行激励。通过调整开路枝节的长度和Z型微带枝节的长度，可以得到良好的三阶谐振响应，并在通带两侧边缘形成高滚降辐射零点。
The present invention discloses a miniaturized slot-coupled fed microstrip filter antenna, which includes a lower dielectric plate, a metal floor, an upper dielectric plate, and a feeding network located on the lower surface of the lower dielectric plate, and a radiation network located on the upper surface of the upper dielectric plate. The radiation network is an axisymmetric structure, which includes a main patch, two slave patches, and two Z-shaped microstrip branches. The metal floor is provided with a strip floor coupling slot. The strip floor coupling slot is located directly below the main patch. The feeding network includes a main feed line and an open-circuit branch. The feeding network excites the upper radiation network through the strip floor coupling slot on the floor. By adjusting the length of the open-circuit branch and the length of the Z-shaped microstrip branch, a good third-order resonant response can be obtained, and a high roll-off radiation zero point can be formed at the edges of both sides of the passband.
Description
Technical Field
The invention relates to the technical field of antennas, in particular to a miniaturized slot coupling feed microstrip filter antenna.
Background
In recent years, 5G communication systems have been rapidly developed, and demands for miniaturized, high transmission efficiency devices have been increasing, which has highlighted the importance of the microwave front-end device field, particularly, the continuous development of antenna technology. The conventional method of designing the filter and the antenna separately introduces additional loss to the system, which is disadvantageous for miniaturization of the system. In order to meet the development requirement of the era, the filter antenna is distinguished by virtue of the high-efficiency antenna and filter integrated design, and gradually draws extensive research attention.
The most intuitive way to implement a filtered antenna is to connect the antenna radiator and filtering structure directly, but this leads to increased size, increased profile and reduced antenna gain. Today, fusion designs have become the dominant trend for filter antennas. Under the guidance of the method, the filter antenna is developed towards miniaturization, and no obvious filter circuit is needed.
Parasitic elements can effectively suppress unwanted frequency bands without introducing extra loss, and thus are receiving great attention in the miniaturization trend. Parasitic elements can be used for a variety of antenna types to achieve filter responses, with patch antennas exhibiting the greatest potential for achieving compact size. Common parasitic structures include U-shaped resonators, parasitic stubs, shorting posts, slots, and stacked patches. However, these elements tend to result in bulky dimensions, especially in knots and laminated patches.
Filtering branches are typically added to the feed line to absorb unwanted signals. But the size of the feeder structure will inevitably increase due to the parallel structure of the limbs. The use of stacked patches is also an effective way to achieve filtering, but has the problems of high profile and design complexity. Thus, it remains a challenge to design a filter antenna with good radiation performance while maintaining a compact size.
Disclosure of Invention
The invention aims to provide a miniaturized slot coupling feed microstrip filter antenna aiming at the defects of complex design and large size of the traditional filter microstrip antenna.
The aim of the invention can be achieved by adopting the following technical scheme:
a miniaturized slot coupling feed microstrip filter antenna comprises a lower dielectric plate, a metal floor, an upper dielectric plate and a feed network, wherein the lower dielectric plate, the metal floor and the upper dielectric plate are sequentially arranged from bottom to top;
the radiation network is in an axisymmetric structure and comprises a main patch, two slave patches and two Z-shaped microstrip branches, wherein two sides of the main patch are respectively connected with one slave patch through one Z-shaped microstrip branch;
the metal floor is provided with a strip-shaped floor coupling gap which is positioned right below the main patch;
the feed network comprises a main feeder line and an open circuit branch knot, wherein one end of the main feeder line is connected with one end of the open circuit branch knot;
the projection of the main feeder line and the strip-shaped floor coupling gap falling on the feed network is vertically arranged;
The projections of the open-circuit branches and the strip-shaped floor coupling gaps falling on the feed network are staggered;
the total length of the main feeder line is equal to one quarter wavelength of a low-frequency radiation zero point;
the open-circuit branch knot is of a Z-shaped structure;
the length of the slave patch is larger than that of the master patch, and the width of the slave patch is smaller than that of the master patch;
The Z-shaped microstrip branch is connected with the upper half part of the non-radiation edge of the main patch and the lower half part of the non-radiation edge of the auxiliary patch;
the third resonance and the high-frequency zero point of the antenna are adjusted by adjusting the length and the width of the Z-shaped microstrip branch knot, and the impedance matching is further improved.
And the length of the open-circuit branch is adjusted, so that the positions of the low-frequency zero point and the first resonance are adjusted.
The TM 10 mode of the main patch corresponds to the second resonance.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. The slot coupling feed microstrip filter antenna has a wider passband (14.2%), and the gain curve is flat in the passband range, and the highest gain and the smallest gain are 6.34 dBi and 5.72 dBi respectively.
2. The slot coupling feed microstrip filter antenna has very high roll-off performance at the edges of both sides of a passband, and the low/high frequency roll-off slope reaches 500/366.6 dB/GHz.
3. The slot coupling feed microstrip filter antenna has the advantages of independent and adjustable zero point, simple structure and convenient design process.
4. The slot coupling feed microstrip filter antenna has the advantages of small size, low profile, low cost and good application prospect.
Drawings
Fig. 1 is a 3D structure diagram of a microstrip filter antenna according to an embodiment of the present invention.
Fig. 2 is a side view of a microstrip filter antenna according to an embodiment of the present invention.
Fig. 3 is a top view of a microstrip filter antenna according to an embodiment of the present invention.
Fig. 4 is a bottom view of a microstrip filter antenna according to an embodiment of the present invention.
Fig. 5 shows a microstrip filter antenna according to an embodiment of the present inventionAnd the gain (Realized Gain) parameters, the solid line is the gain simulation curve, and the dotted line isAnd (5) simulating a curve.
Fig. 6 is a radiation pattern of the microstrip filter antenna provided by the embodiment of the invention at 2.36GHz, where (a) is an XOZ plane and (b) is a YOZ plane.
Fig. 7 is a radiation pattern of the microstrip filter antenna provided by the embodiment of the invention at 2.53GHz, wherein (a) is an XOZ plane and (b) is a YOZ plane.
Fig. 8 is a radiation pattern of the microstrip filter antenna provided by the embodiment of the invention at 2.69GHz, where (a) is an XOZ plane and (b) is a YOZ plane.
In the figure, the marks comprise a lower dielectric plate 1, an upper dielectric plate 2, a main feeder line 3, an open-circuit branch 4, a floor coupling gap 5, a main patch 6, a slave patch 7 and a Z-type microstrip branch 8.
Detailed Description
The invention will be further described with reference to specific examples.
As shown in fig. 1 to 4, the miniaturized slot coupling feed microstrip filter antenna provided in this embodiment has a center frequency of 2.53GHz, and gain zeros at positions of 2.28GHz and 2.80GHz, respectively, and includes a lower dielectric plate 1, a metal floor, an upper dielectric plate 2, and a feed network located on the lower surface of the lower dielectric plate 1 and a radiation network located on the upper surface of the upper dielectric plate 2, where the structure of placing the radiation network and the feed network in layers is conducive to achieving miniaturization of the filter antenna.
The radiation network is of an axisymmetric structure and has bilateral symmetry, and comprises a main patch 6, two auxiliary patches 7 and two Z-shaped microstrip branches 8, wherein two sides of the main patch 6 are respectively connected with the auxiliary patch 7 through the Z-shaped microstrip branches 8, and the Z-shaped microstrip branches 8 are connected with the upper half part of the non-radiation edge of the main patch 6 and the lower half part of the non-radiation edge of the auxiliary patch 7. The loading of the Z-shaped microstrip stub 8 reduces the coupling between the master patch 6 and the slave patch 7, improves the impedance matching of the passband, and significantly compresses the lateral dimension of the antenna. And, loading Z-shaped microstrip branch 8 has lengthened the radiation current path length, has passband and higher bandwidth of lower frequency than the condition of not loading Z-shaped microstrip branch 8. Wherein the TM10 mode of the main patch 6 corresponds to the second resonance, and the third resonance is introduced from the loading of the patch 7. The third resonance and the high-frequency zero point of the antenna can be adjusted by adjusting the length of the Z-shaped microstrip branch 8 or the length of the slave patch 7, and the impedance matching is further improved.
The slave patch 7 may be slightly longer than the master patch 6, in particular 1mm, but narrower in width, in particular 3mm.
The metal floor is provided with a strip-shaped floor coupling gap 5, and the strip-shaped floor coupling gap 5 is positioned right below the width direction axis of the main patch 6, and the length of the strip-shaped floor coupling gap is not more than the width of the main patch 6.
The feed network comprises a main feeder line 3 and an open-circuit branch 4, wherein the part of the main feeder line 3 exceeding the strip-shaped floor coupling gap 5 is connected with the open-circuit branch 4 in parallel, the total length of the open-circuit branch 4 is approximately equal to one quarter wavelength of a low-frequency radiation zero point, the open-circuit branch 4 is of a Z-shaped structure, the structure is more compact, and the positions of the low-frequency zero point and the first resonance can be adjusted by adjusting the length of the open-circuit branch 4.
The main feed line 3 is arranged perpendicularly to the projection of the strip-shaped floor coupling slit 5 onto the feed network.
The projections of the open-circuit branches 4 and the strip-shaped floor coupling gaps 5 falling on the feed network are staggered.
The signal is fed through the main feed line 3 and energy is coupled to the upper radiating network through the floor coupling slots 5 of the metal floor. By adjusting the length of the open stub 4 and the length of the Z-type microstrip stub 8 and the length of the slave patch 7, a good third-order resonance response can be obtained, and high roll-off radiation zero points are formed at the edges of both sides of the passband.
In the design of this embodiment, the materials of the lower dielectric plate 1 and the upper dielectric plate 2 are respectively "Rogers RO4003", the dielectric constant is 3.55, the loss tangent is 0.0027, the thickness of the dielectric plate 1 is 0.5mm, and the thickness of the dielectric plate 2 is 3mm.
After the dimensional parameters of each part of the slot coupling feed microstrip filter antenna of the embodiment are adjusted, verification simulation is carried out on the slot coupling feed microstrip filter antenna of the embodiment through calculation and electromagnetic field simulation, and as shown in fig. 5, the antenna is shown in a frequency range of 2 GHz-3.2 GHz(Input port return loss) and implementing gain (Realized Gain) parameters, two curves in the figure, the broken line isThe solid line is the gain, and the value of the dotted curve is smaller than-10 dB in the frequency range of 2.35 GHz-2.71 GHz, the solid line value is about 6dBi, and the simulation result shows that the slot coupling feed microstrip filter antenna of the embodiment has wider passband and stable gain, and can meet the application requirements of Wi-Fi and other wireless communication systems in the frequency range of 2.35 GHz-2.71 GHz.
The radiation patterns of XOZ and YOZ planes of the HFSS simulation model of the slot-coupled fed microstrip filter antenna of the present embodiment at 2.36GHz are shown in fig. 6 (a) and 6 (b).
The radiation patterns of XOZ and YOZ planes of the HFSS simulation model of the slot-coupled fed microstrip filter antenna of the present embodiment at 2.53GHz are shown in fig. 7 (a) and 7 (b).
The radiation patterns of XOZ and YOZ planes of the HFSS simulation model of the slot-coupled fed microstrip filter antenna of the present embodiment at 2.69GHz are shown in fig. 8 (a) and 8 (b).
In the above embodiment, the lower dielectric plates 1 and 2 are made of any one of TACONIC TLX, polyimide, polytetrafluoroethylene glass cloth and co-fired ceramic, and the metal used for the upper dielectric plate metal floor 3, the main feeder line 4, the open circuit branch 5, the main patch 6, the slave patch 7 and the Z-type microstrip branch 8 is any one of aluminum, iron, tin, copper, silver, gold and platinum, or an alloy of any one of aluminum, iron, tin, copper, silver, gold and platinum.
While the foregoing is directed to the preferred embodiments of the present invention, it will be appreciated by those skilled in the art that changes and modifications may be made without departing from the principles of the invention, such changes and modifications are also intended to be within the scope of the invention.
Claims (8)
1. The miniature slot coupling feed microstrip filter antenna is characterized by comprising a lower dielectric plate (1), a metal floor, an upper dielectric plate (2) and a feed network, wherein the lower dielectric plate (1), the metal floor and the upper dielectric plate (2) are sequentially arranged from bottom to top, the feed network is positioned on the lower surface of the lower dielectric plate (1), and the radiation network is positioned on the upper surface of the upper dielectric plate (2);
The radiation network is of an axisymmetric structure and comprises a main patch (6), two auxiliary patches (7) and two Z-shaped microstrip branches, wherein two sides of the main patch (6) are respectively connected with the auxiliary patches (7) through the Z-shaped microstrip branches;
The metal floor is provided with a strip-shaped floor coupling gap (5), and the strip-shaped floor coupling gap (5) is positioned under the main patch (6);
the feed network comprises a main feeder line (3) and an open-circuit branch (4), wherein one end of the main feeder line (3) is connected with one end of the open-circuit branch (4);
The projection of the main feeder line (3) and the strip-shaped floor coupling gap (5) falling on the feed network is vertically arranged;
the projections of the open-circuit branches (4) and the strip-shaped floor coupling gaps (5) falling on the feed network are staggered.
2. A miniaturized filtered microstrip antenna according to claim 1, characterized in that the total length of the main feed line (3) is equal to a quarter wavelength of the low frequency radiation null.
3. A miniaturized filtering microstrip antenna according to claim 1, characterized in that said open stub (4) is of a Z-shaped structure.
4. A miniaturized filter microstrip antenna according to claim 1, wherein the slave patch (7) has a length greater than the master patch (6) and a width smaller than the master patch (6).
5. A miniaturized filter microstrip antenna according to claim 1, wherein the Z-shaped microstrip stub connects the upper half of the non-radiating edge of the main patch (6) and the lower half of the non-radiating edge of the slave patch (7).
6. A miniaturized filtered microstrip antenna according to claim 1, wherein the adjustment of the third resonance and the high frequency zero of the antenna is achieved by adjusting the length and width of the Z-shaped microstrip branches and further improving the impedance matching.
7. A miniaturized filter microstrip antenna according to claim 1, characterized in that the adjustment of the length of the open stub (4) is achieved by adjusting the position of the low frequency zero and the first resonance.
8. A miniaturized filtered microstrip antenna according to claim 1, characterized in that the TM10 mode of the main patch (6) corresponds to the second resonance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202411664386.6A CN119481716A (en) | 2024-11-20 | 2024-11-20 | A miniaturized slot-coupled microstrip filter antenna |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202411664386.6A CN119481716A (en) | 2024-11-20 | 2024-11-20 | A miniaturized slot-coupled microstrip filter antenna |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102119453A (en) * | 2008-06-06 | 2011-07-06 | 传感电子有限责任公司 | Broadband antenna with multiple associated patches and coplanar grounding for RFID applications |
| US20140062794A1 (en) * | 2012-08-31 | 2014-03-06 | Shure Incorporated | Broadband Multi-Strip Patch Antenna |
| CN118645802A (en) * | 2024-04-30 | 2024-09-13 | 中国船舶集团有限公司第七二三研究所 | A broadband stacked patch antenna with horizontally bent probe and single feed |
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- 2024-11-20 CN CN202411664386.6A patent/CN119481716A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102119453A (en) * | 2008-06-06 | 2011-07-06 | 传感电子有限责任公司 | Broadband antenna with multiple associated patches and coplanar grounding for RFID applications |
| US20140062794A1 (en) * | 2012-08-31 | 2014-03-06 | Shure Incorporated | Broadband Multi-Strip Patch Antenna |
| CN118645802A (en) * | 2024-04-30 | 2024-09-13 | 中国船舶集团有限公司第七二三研究所 | A broadband stacked patch antenna with horizontally bent probe and single feed |
Non-Patent Citations (2)
| Title |
|---|
| M. M. N 等: "必应，ruibin deng patch antenna Z", 《2024 IEEE INTERNATIONAL CONFERENCE ON CONTEMPORARY COMPUTING AND COMMUNICATIONS (INC4)》, 3 September 2024 (2024-09-03), pages 1 - 4 * |
| 邓瑞彬: "宽带高抑制度高选择性微带滤波天线及阵列研究", 《中国优秀硕士学位论文全文数据库信息科技辑》, 1 May 2025 (2025-05-01) * |
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