CN211088517U - Frequency tunable microstrip antenna and terminal communication equipment - Google Patents
Frequency tunable microstrip antenna and terminal communication equipment Download PDFInfo
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- CN211088517U CN211088517U CN201922310421.5U CN201922310421U CN211088517U CN 211088517 U CN211088517 U CN 211088517U CN 201922310421 U CN201922310421 U CN 201922310421U CN 211088517 U CN211088517 U CN 211088517U
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- 238000004891 communication Methods 0.000 title claims abstract description 16
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- 239000003990 capacitor Substances 0.000 claims description 22
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- 238000005388 cross polarization Methods 0.000 abstract description 6
- 238000010586 diagram Methods 0.000 description 8
- 230000005540 biological transmission Effects 0.000 description 7
- 238000004088 simulation Methods 0.000 description 4
- 238000007667 floating Methods 0.000 description 2
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Abstract
The utility model discloses a microstrip antenna and terminal communication equipment that frequency is tunable, this microstrip antenna includes: the feed line is arranged on the central axis of the radiation patch, so that the cross polarization of the microstrip antenna can be effectively reduced, and the adjustable device is arranged on the central axis of the radiation patch, so that the cross polarization of the microstrip antenna can be further reduced, the working frequency of the microstrip antenna can be tuned, and the low-profile broadband of the microstrip antenna can be realized; and the adjustable device is arranged at the intersection point of the central axis and the side edge of the radiation patch, so that the maximization of the frequency tuning range can be realized.
Description
Technical Field
The utility model belongs to a mobile communication's design field especially relates to a microstrip antenna and terminal communication equipment that frequency is tunable.
Background
With the development of 5G communication technology, 5G communication devices such as mobile phones, tablet computers, notebook computers, etc. need to be compatible with 2G, 3G and 4G antennas as well as MIMO antennas in order to meet the requirement of high throughput. The increase in the number of antennas inevitably leads to a more and more tight space inside the communication device, and therefore, it is necessary to reduce the occupied area of each antenna as much as possible. Generally, in order to reduce the number of antennas, the bandwidth of the antenna may be increased, or a multi-frequency antenna may be designed.
The bandwidth of a microstrip antenna is limited by the thickness of the antenna and the dielectric constant of the dielectric substrate. Generally, the thinner the thickness, the narrower the antenna bandwidth, the lower the radiation efficiency; the larger the dielectric constant of the dielectric substrate, the narrower the bandwidth and the lower the radiation efficiency.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a microstrip antenna and terminal communication equipment that frequency is tunable is through realizing that operating frequency is tunable, can obtain great bandwidth when reducing microstrip antenna's section height.
In order to solve the above problem, the technical scheme of the utility model is that:
a frequency tunable microstrip antenna comprising: the radiation patch, the dielectric layer, the stratum, the feeder line and the adjustable device;
the radiation patch is positioned on the upper surface of the dielectric layer, the stratum is positioned on the lower surface of the dielectric layer, the feeder line is electrically connected with the radiation patch, one part of the feeder line is positioned on the central axis of the radiation patch, and radio-frequency signals enter the radiation patch through the feeder line;
the adjustable device is used for adjusting the working frequency of the microstrip antenna, the adjustable device is arranged on the central axis of the radiation patch, one end of the adjustable device is connected with the stratum, and the other end of the adjustable device is connected with the radiation patch.
According to the utility model discloses an embodiment, adjustable device locates the axis and the side intersect department of radiation paster.
According to the utility model discloses an embodiment, the feeder with adjustable device is located on the same axis of radiation paster.
According to the utility model discloses an embodiment, the one end of feeder is located the lower surface of dielectric layer, be equipped with a plurality of via holes on the dielectric layer, the other end of feeder passes the via hole with the radiation paster electricity is connected, and radio frequency signal passes through in proper order the feeder the via hole gets into the radiation paster.
According to the utility model discloses an embodiment, adjustable device is single-pole single-throw radio frequency switch, single-pole single-throw radio frequency switch's radio frequency input with the radiation paster links to each other, single-pole single-throw radio frequency switch's radio frequency output links to each other with the stratum.
According to an embodiment of the present invention, the adjustable device includes a radio frequency switch and a capacitor; the radio frequency input end of the radio frequency switch is connected with the radiation patch, the radio frequency output end of the radio frequency switch is connected with one end of the capacitor or suspended in the air, and the other end of the capacitor is connected with the stratum.
According to an embodiment of the present invention, the adjustable device includes a radio frequency switch and an inductor; the radio frequency input end of the radio frequency switch is connected with the radiation patch, the radio frequency output end of the radio frequency switch is connected with one end of the inductor or suspended in the air, and the other end of the inductor is connected with the stratum.
According to an embodiment of the present invention, the adjustable device includes a radio frequency switch, an inductor, and a capacitor; the radio frequency input end of the radio frequency switch is connected with the radiation patch, the radio frequency output end of the radio frequency switch is connected with one end of the inductor or connected with one end of the capacitor or suspended in the air, the other end of the inductor is connected with the stratum, and the other end of the capacitor is connected with the stratum.
According to an embodiment of the present invention, the radio frequency switch is a single-pole multi-throw switch.
According to the utility model discloses an embodiment, the upper surface of dielectric layer is equipped with the metal and bordures, the metal is bordured and is located the border of dielectric layer, the metal bordure with the stratum links to each other.
A terminal communication device, comprising the utility model discloses a frequency tunable microstrip antenna in the embodiment.
The utility model discloses owing to adopt above technical scheme, make it compare with prior art and have following advantage and positive effect:
1) the utility model discloses a tunable microstrip antenna of frequency in the embodiment locates the feeder on the axis of radiation paster, can effectively reduce microstrip antenna's cross polarization, locates the adjustable device on the axis of radiation paster, can further reduce microstrip antenna's cross polarization on the one hand, and on the other hand can realize harmonious microstrip antenna's operating frequency, and then realizes microstrip antenna's low section broadband.
2) The utility model relates to an embodiment's microstrip antenna that frequency is tunable locates the adjustable device in the axis of radiation paster and the intersect department of side, can realize the maximize of frequency tuning range.
Drawings
Fig. 1 is a schematic structural diagram of a frequency tunable microstrip antenna according to an embodiment of the present invention;
fig. 2 is a top view of a frequency tunable microstrip antenna according to an embodiment of the present invention;
fig. 3 is a bottom view of a frequency tunable microstrip antenna according to an embodiment of the present invention;
fig. 4 is a side view of a frequency tunable microstrip antenna according to an embodiment of the present invention;
fig. 5 is a schematic connection diagram of an adjustable device according to an embodiment of the present invention;
fig. 6 is a simulation result diagram of the reflection coefficient of the microstrip antenna with tunable frequency according to an embodiment of the present invention;
fig. 7 is a simulation result diagram of the radiation efficiency of the microstrip antenna with tunable frequency according to an embodiment of the present invention;
fig. 8 is a current distribution diagram of a frequency tunable microstrip antenna according to an embodiment of the present invention;
fig. 9 is a bottom view of a frequency tunable microstrip antenna according to an embodiment of the present invention;
fig. 10 is a schematic view of the connection of the adjustable device according to an embodiment of the present invention;
fig. 11 is a simulation result diagram of the reflection coefficient of the microstrip antenna with tunable frequency according to an embodiment of the present invention;
fig. 12 is a simulation result diagram of the radiation efficiency of the frequency tunable microstrip antenna according to an embodiment of the present invention;
fig. 13 is a schematic structural diagram of a terminal communication device in an embodiment of the present invention.
Description of reference numerals:
1: a radiation patch; 2: a dielectric layer; 201: metal wrapping; 3: an earth formation; 4: a feeder line; 401: a first feed line; 402: a second feed line; 5: an adjustable device; 6: a via hole; 601: a signal aperture; 602: a ground hole; 7: a metal frame; 8: a glass rear shell; 9: a battery; 10: a mobile phone mainboard; 11: a radio frequency chip; 12: a first diversity antenna; 13: a second diversity antenna; 14: a first radio frequency transmission line; 15: a second radio frequency transmission line.
Detailed Description
The present invention provides a frequency tunable microstrip antenna and a terminal communication device, which are described in further detail below with reference to the accompanying drawings and specific embodiments. The advantages and features of the present invention will become more fully apparent from the following description and appended claims.
Example one
The utility model provides a microstrip antenna that frequency is tunable, include: the device comprises a radiation patch 1, a dielectric layer 2, a stratum 3, a feeder line 4 and an adjustable device 5. The radiation patch 1 is positioned on the upper surface of the dielectric layer 2, the stratum 3 is positioned on the lower surface of the dielectric layer 2, the feeder line 4 is electrically connected with the radiation patch 5, one part of the feeder line 4 is positioned on the central axis of the radiation patch 1, and radio-frequency signals enter the radiation patch 1 through the feeder line 4.
The adjustable device 5 is used for adjusting the working frequency of the microstrip antenna, the adjustable device 5 is arranged on the central axis of the radiation patch 1, one end of the adjustable device 5 is connected with the ground layer 3, and the other end of the adjustable device 5 is connected with the radiation patch 1.
Specifically, as shown in fig. 1. The shape of the radiation patch 1 is rectangular, and may be an ellipse or other polygonal shapes. In the present embodiment, an embedded feeding manner is adopted, that is, the feeder 4 forms a section of coplanar waveguide line inside the radiation patch 1 and then is connected to the radiation patch 1. In addition, the feeder line 4 is positioned on the central axis of the radiation patch 1, so that the cross polarization of the microstrip antenna can be effectively reduced. The adjustable device 5 is also positioned on the central axis of the radiation patch 1 and positioned at the edge of the radiation patch 1, so that the cross polarization can be reduced, and the maximization of the frequency tuning range can be realized. The tunable device 5 may be disposed on the upper surface of the dielectric layer 2, with one end directly connected to the radiation patch 1 and the other end indirectly connected to the ground layer 3 through the via 6. The adjustable device 5 comprises a radio frequency switch, an inductor and a capacitor, wherein a radio frequency input end of the radio frequency switch is connected with the radiation patch, an output end of the radio frequency switch is connected with the inductor or the capacitor, one end of the inductor or the capacitor is connected with a radio frequency output end of the radio frequency switch, and the other end of the inductor or the capacitor is connected with the stratum 3. The radio frequency switch is switched to select inductors or capacitors with different magnitudes, so that the current path on the radiation patch 1 is changed, and the tunable working frequency of the microstrip antenna is further realized.
The microstrip antenna is manufactured by adopting a microwave radio frequency board process, specifically, a loose R5575 board is adopted, and the size of the microstrip antenna is 25mm by 0.37mm, as shown in figures 2, 3 and 4. The radiation patch 1, the metal wrapping 201, the first feeder 401 and the adjustable device 5 are all located on the first metal layer; a plurality of via holes 6 are arranged on the dielectric layer 2, and the via holes 6 comprise signal holes 601 and ground holes 602. The ground layer 3, the second feed line 402 is located on the second metal layer. The first feed line 401 and the second feed line 402 are connected through a signal hole 601, and the radio frequency signal sequentially passes through the second feed line 402, the signal hole 601 and the first feed line 401 and enters the radiation patch 1. The metal binding 201 and the ground layer 3 are connected through a series of ground holes 602, so that the metal binding 201 and the ground layer 3 form a whole ground together. One end of the adjustable device 5 is connected with the radiation patch 1, and the other end of the adjustable device 5 is connected with the metal wrapping edge 201. In addition, the adjustable device 5 can also be arranged on the second metal layer, at this time, one end of the adjustable device 5 is connected with the ground layer 3, and the other end of the adjustable device is connected with the radiation patch 1 through the via hole 6 after passing through a small section of transmission line.
As shown in fig. 5, the tunable device 5 is composed of a radio frequency switch, capacitors C1 and C2, and inductors L and L, the radiation patch 1 is connected to the ground layer 3 through the radio frequency switch, a capacitor C1 or a capacitor C2, or an inductor L or an inductor L, in turn, when the radio frequency switch is switched to a floating NC position, the resonance characteristic of the microstrip antenna is shown, which is called an original state, when the radio frequency switch is switched to a position where the capacitor C1 is 1pF, the resonance frequency of the microstrip antenna is reduced by about 100MHz, the 3dB bandwidth is about 100MHz, when the radio frequency switch is switched to a position where the capacitor C2 is 1.7pF, the resonance frequency of the microstrip antenna is further reduced by about 100MHz, when the radio frequency switch is switched to a position where the inductor L is 1.2nH, the resonance frequency of the microstrip antenna is increased by about 100MHz based on the original state, when the radio frequency switch is switched to a position where the inductor L is 1.2nH, the resonance frequency of the microstrip antenna is further increased by about 100MHz, and the resonance frequency of the microstrip antenna is increased by about 100MHz, thereby the impedance of the microstrip antenna is increased, which is greater than 100MHz, and the impedance of the microstrip antenna is equal to the antenna, which is equal to 0.6nH, which is greater than the.
As shown in fig. 8, when the rf switch is switched to the position C2 equal to 1.7pF, the current path of the radiation patch 1 of the microstrip antenna is significantly longer than the current path of the rf switch switched to the floating NC gear, so that the resonant frequency of the antenna can be reduced, and when the rf switch is switched to the position L2 equal to 0.6nH, the current zero of the radiation patch 1 of the microstrip antenna moves to the side of the feed point of the radiation patch 1, so that the current path of the main mode of the antenna is shortened, and the resonant frequency of the antenna can be increased.
The position of the tunable device 5 in this embodiment is located at the edge of the radiation patch 1 and on the central axis of the radiation patch 1. Meanwhile, the first feed line 401 is also located on the central axis of the radiation patch 1, and the adjustable device 5 may also be located at other positions on the central axis of the radiation patch 1. However, when the tunable device 5 is located at the edge of the radiation patch, a wider frequency tuning range can be achieved under the condition of smaller capacitance or larger inductance, and from the viewpoint of actual capacitance or actual inductance loss, when the actual parallel capacitance is smaller or the parallel inductance is larger, the loss of the circuit can be reduced, and further, the loss of the antenna efficiency can be reduced.
In addition, the present embodiment shows the case where the position of the adjustable device 5 is located on the central axis of the radiation patch 1. The position of the adjustable device 5 may be located at any position in the radiation patch 1, and may be selected according to actual situations.
Example two
The microstrip antenna in this embodiment is manufactured by using a microwave rf board process, specifically, a loose R5575 board, and the size of the microstrip antenna is 25mm by 0.37mm, where the adjustable device 5 is a single-pole single-throw rf switch, as shown in fig. 9 and 10. The adjustable device 5 is positioned on the stratum 3, the radio frequency input end of the single-pole single-throw radio frequency switch is connected with the radiation patch 1 through the via hole 6, and the radio frequency output end of the single-pole single-throw radio frequency switch is connected with the stratum 3. When the single-pole single-throw radio frequency switch is switched off, the resonance characteristic of the microstrip antenna is reflected, and the resonance characteristic is called as an original state. When the single-pole single-throw radio frequency switch is closed, the resonance frequency of the microstrip antenna moves towards high frequency by about 100MHz, the-3 dB bandwidth is about 100MHz, the radiation efficiency of the microstrip antenna is basically consistent with that of the microstrip antenna when the single-pole single-throw radio frequency switch is switched off, and the in-band is larger than-8 dB, as shown in figures 11 and 12. The bandwidth tuned by the single-pole single-throw radio frequency switch realizes 3.3 GHz-3.5 GHz, and can meet the index requirements of the diversity antenna of the 5G communication system.
EXAMPLE III
The invention further provides a terminal communication device using the frequency tunable microstrip antenna described in the first embodiment or the second embodiment, which is specifically shown in fig. 13. The terminal communication device is a mobile phone, and the microstrip antenna with tunable frequency according to the first embodiment or the second embodiment is used as a 5G diversity antenna of the mobile phone. The mobile phone comprises a metal frame 7, a glass rear shell 8, a battery 9, a mobile phone mainboard 10, a radio frequency chip 11, a first diversity antenna 12, a second diversity antenna 13, a first radio frequency transmission line 14 and a second radio frequency transmission line 15. The first diversity antenna 12 is connected to the rf chip 11 through a first rf transmission line 14, and the second diversity antenna 13 is connected to the rf chip 11 through a second rf transmission line 15. The first diversity antenna 12 is orthogonal to the second diversity antenna 13, which can effectively reduce the isolation between the two diversity antennas.
The mobile phone adopts the microstrip antenna with tunable frequency described in the first embodiment or the second embodiment as the first diversity antenna 12 and the second diversity antenna 13, so that the tunable working frequency can be realized, and the index requirements of a 5G communication system can be met.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, the changes are still within the scope of the present invention if they fall within the scope of the claims and their equivalents.
Claims (10)
1. A frequency tunable microstrip antenna comprising: the radiation patch, the dielectric layer, the stratum, the feeder line and the adjustable device;
the radiation patch is positioned on the upper surface of the dielectric layer, the stratum is positioned on the lower surface of the dielectric layer, the feeder line is electrically connected with the radiation patch, one part of the feeder line is positioned on the central axis of the radiation patch, and radio-frequency signals enter the radiation patch through the feeder line;
the adjustable device is used for adjusting the working frequency of the microstrip antenna, the adjustable device is arranged on the central axis of the radiation patch, one end of the adjustable device is connected with the stratum, and the other end of the adjustable device is connected with the radiation patch.
2. A frequency tunable microstrip antenna according to claim 1 wherein the tunable device is disposed at the intersection of the central axis and the lateral sides of the radiating patch.
3. A frequency tunable microstrip antenna according to claim 1 wherein the feed line and the tunable device are located on the same central axis of the radiating patch.
4. A microstrip antenna according to claim 1 wherein one end of said feed line is located on the lower surface of a dielectric layer, said dielectric layer having a plurality of vias formed therein, the other end of said feed line passing through said vias and electrically connected to said radiating patch, and a radio frequency signal passing through said feed line and said vias in sequence to enter said radiating patch.
5. A frequency tuneable microstrip antenna according to any of claims 1 to 4 wherein the tuneable device is a single pole single throw radio frequency switch having its radio frequency input connected to the radiating patch and its radio frequency output connected to the ground.
6. A frequency tunable microstrip antenna according to any one of claims 1 to 4 wherein the tunable device comprises a radio frequency switch, a capacitor; the radio frequency input end of the radio frequency switch is connected with the radiation patch, the radio frequency output end of the radio frequency switch is connected with one end of the capacitor or suspended in the air, and the other end of the capacitor is connected with the stratum.
7. A frequency tunable microstrip antenna according to any one of claims 1 to 4 wherein the tunable device comprises a radio frequency switch, an inductor; the radio frequency input end of the radio frequency switch is connected with the radiation patch, the radio frequency output end of the radio frequency switch is connected with one end of the inductor or suspended in the air, and the other end of the inductor is connected with the stratum.
8. A frequency tunable microstrip antenna according to any one of claims 1 to 4 wherein the tunable devices comprise radio frequency switches, inductors, capacitors; the radio frequency input end of the radio frequency switch is connected with the radiation patch, the radio frequency output end of the radio frequency switch is connected with one end of the inductor or connected with one end of the capacitor or suspended in the air, the other end of the inductor is connected with the stratum, and the other end of the capacitor is connected with the stratum.
9. A frequency tunable microstrip antenna according to claim 1 wherein the dielectric layer has a metal rim on its upper surface, the metal rim being located at the edge of the dielectric layer, the metal rim being connected to the ground layer.
10. A terminal communication device, characterized in that it comprises a frequency-tunable microstrip antenna according to any of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922310421.5U CN211088517U (en) | 2019-12-20 | 2019-12-20 | Frequency tunable microstrip antenna and terminal communication equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922310421.5U CN211088517U (en) | 2019-12-20 | 2019-12-20 | Frequency tunable microstrip antenna and terminal communication equipment |
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| Publication Number | Publication Date |
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| CN211088517U true CN211088517U (en) | 2020-07-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201922310421.5U Expired - Fee Related CN211088517U (en) | 2019-12-20 | 2019-12-20 | Frequency tunable microstrip antenna and terminal communication equipment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113422619A (en) * | 2021-06-18 | 2021-09-21 | 安徽安努奇科技有限公司 | Tuning circuit and communication equipment |
| WO2024066679A1 (en) * | 2022-09-30 | 2024-04-04 | Oppo广东移动通信有限公司 | Antenna assembly and electronic device |
-
2019
- 2019-12-20 CN CN201922310421.5U patent/CN211088517U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113422619A (en) * | 2021-06-18 | 2021-09-21 | 安徽安努奇科技有限公司 | Tuning circuit and communication equipment |
| CN113422619B (en) * | 2021-06-18 | 2022-05-27 | 安徽安努奇科技有限公司 | Tuning circuit and communication equipment |
| WO2024066679A1 (en) * | 2022-09-30 | 2024-04-04 | Oppo广东移动通信有限公司 | Antenna assembly and electronic device |
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