CN106252848A - A kind of compact type high-isolation antenna - Google Patents
A kind of compact type high-isolation antenna Download PDFInfo
- Publication number
- CN106252848A CN106252848A CN201610784913.6A CN201610784913A CN106252848A CN 106252848 A CN106252848 A CN 106252848A CN 201610784913 A CN201610784913 A CN 201610784913A CN 106252848 A CN106252848 A CN 106252848A
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- antenna
- printed substrate
- conduction band
- feed
- metal conduction
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- 238000002955 isolation Methods 0.000 title claims abstract description 50
- 239000000758 substrate Substances 0.000 claims abstract description 62
- 239000002184 metal Substances 0.000 claims abstract description 56
- 229910052751 metal Inorganic materials 0.000 claims abstract description 56
- 230000005404 monopole Effects 0.000 claims abstract description 38
- 230000005855 radiation Effects 0.000 claims abstract description 28
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims 1
- 239000010931 gold Substances 0.000 claims 1
- 229910052737 gold Inorganic materials 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 3
- 238000010276 construction Methods 0.000 abstract description 2
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
- H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q23/00—Antennas with active circuits or circuit elements integrated within them or attached to them
Landscapes
- Details Of Aerials (AREA)
Abstract
The invention provides a kind of compact type high-isolation antenna and include printed substrate, active antenna annularly it is provided with on described printed substrate, described active antenna annularly be provided above monopole antenna, the metal conduction band in described active antenna annularly includes a clearance zone being arranged on printed substrate and is located at described clearance zone and being connected with the non-clearance zone of printed substrate, described monopole antenna includes feed arm and radiation arm, described feed arm one end is connected with the first feed of described printed substrate, and the other end is connected with described radiation arm；Wherein, described feed arm is positioned in the range of above the printed substrate that described clearance zone is corresponding.This antenna will active antenna and symmetric arms monopole antenna be combined annularly, utilize the feature that both eradiation electric currents are orthogonal, also can realize higher isolation when two kinds of aerial positions overlap, simple in construction, change various, to realize optimal isolation degree effect more preferable.
Description
Technical field
The present invention relates to the technical field of mobile terminal device Antenna Design, particularly to a kind of compact type high-isolation sky
Line.
Background technology
MIMO is widely used in the numbers such as LTE, 802.11.ac as a kind of technical measures being effectively improved data throughput
In word communication standard.MIMO requires that on terminal unit, integrated multiple antennas are concurrent to realize multichannel data, for ensureing data link
Between correlation coefficient less than 0.5 or lower, the isolation between each antenna is at least above 10dB.It is limited to terminal unit
The restriction of size, how distance between antenna it is difficult to ensure that sufficiently large, therefore, realizes antenna inside crowded terminal unit
Between high-isolation Antenna Design is brought the biggest challenge.
Up to now, for being placed on the antenna at printed substrate edge, improve the tradition of isolation between antenna
Technical measures specifically include that neutral line and decoupling matching network.Wherein, isolation is improved limited by neutral line, and decouples coupling
Network needs to take certain printed substrate area, and limited bandwidth.
Summary of the invention
It is an object of the invention to provide a kind of compact type high-isolation antenna, to solve existing terminal unit raising sky
Between line, isolation is size-limited relatively big, and the Antenna Design thus resulted in is relatively poor by terminal unit size limitation and isolation
Problem.
For achieving the above object, the invention provides a kind of compact type high-isolation antenna, including printed substrate, described
Be provided with active antenna annularly on printed substrate, described active antenna annularly be provided above monopole antenna, institute
State in active antenna annularly includes a clearance zone being arranged on printed substrate and is located at described clearance zone and and track
The metal conduction band that the non-clearance zone of road plate is connected, described monopole antenna includes feed arm and radiation arm, described feed arm one end
Being connected with the first feed of described printed substrate, the other end is connected with described radiation arm；
Wherein, described feed arm is positioned in the range of above the printed substrate that described clearance zone is corresponding.
It is preferred that described feed arm is positioned at the surface of the centrage of described clearance zone.
It is preferred that described monopole antenna is symmetric arms monopole antenna, described radiation arm is symmetric radiation arm, described feedback
The other end of electric arm is connected with the middle of described symmetric radiation arm.
It is preferred that described active antenna annularly and symmetric arms monopole antenna are arranged at the side of described printed substrate
Edge, and described active antenna annularly is printed on the edge of described printed substrate.
It is preferred that described metal conduction band includes grounded metal conduction band and feed metal conduction band, described grounded metal conduction band and
Feed metal conduction band ground level with described printed substrate respectively is connected.
It is preferred that one end of described feed metal conduction band is by the ground level phase of the first electric capacity with described printed substrate
Even, the other end is directly located on the second feed of the side adjacent with described printed substrate edge of clearance zone and connects, institute
The one end stating grounded metal conduction band is connected with the ground level of described printed substrate by the second electric capacity, and the other end is directly with described
Printed substrate is connected.
It is preferred that one end of described feed metal conduction band is by the ground level phase of the first electric capacity with described printed substrate
Even, the other end is vertically with the second feed of the side relative with described printed substrate edge being positioned at described clearance zone even
Connect；Described grounded metal conduction band two ends are connected with described printed substrate and the centre of described grounded metal conduction band is provided with second
Electric capacity.
It is preferred that one end of described feed metal conduction band is connected with the second feed on described printed substrate, the other end
Vertically the one end with described grounded metal conduction band is connected, and the centre position of described feed metal conduction band is provided with inductance, described in connect
The other end of ground metal conduction band is connected with the ground level of described printed substrate by electric capacity.
The compact type high-isolation antenna that the present invention provides has the advantages that
(1) inventive antenna will active antenna and symmetric arms monopole antenna be combined annularly, utilize both ground
The feature that radiation current is orthogonal, also can realize higher isolation when two kinds of aerial positions overlap；
(2) inventive antenna simple in construction, change various, to realize optimal isolation degree effect more preferable.
Accompanying drawing explanation
The compact type high-isolation antenna overall schematic that Fig. 1 provides for the present invention；
The compact type high-isolation antenna structure for amplifying schematic diagram that Fig. 2 provides for Fig. 1；
Fig. 3 is the compact type high-isolation antenna return loss test result figure of the embodiment of the present invention one；
Fig. 4 is the compact type high-isolation antenna global radiation efficiency test result figure of the embodiment of the present invention one；
Fig. 5 is the test result figure of the compact type high-isolation isolation between antennas of the embodiment of the present invention one；
Fig. 6 be the embodiment of the present invention one compact type high-isolation antenna between envelope correlation coefficient test result figure；
Fig. 7 is the current distributing figure of the symmetric arms monopole antenna of the embodiment of the present invention one；
Fig. 8 is the current distributing figure of the active antenna annularly of the embodiment of the present invention one；
Fig. 9 be the embodiment of the present invention one antenna between isolation with distance change test result figure；
Figure 10 is the radiator antenna structure schematic diagram annularly of the embodiment of the present invention two；
Figure 11 is the radiator antenna structure schematic diagram annularly of the embodiment of the present invention three.
Detailed description of the invention
For the present invention is better described, hereby with a preferred embodiment, and coordinate accompanying drawing that the present invention is elaborated, specifically
As follows:
As it is shown in figure 1, the compact type high-isolation antenna that the present invention provides, including printed substrate 1, printed substrate 1
On be provided with active antenna 3 annularly, the active antenna annularly 3 of printed substrate 1 be provided above monopole antenna 2.
As in figure 2 it is shown, active antenna 3 includes a clearance zone 32 being arranged on printed substrate 1 and is located in clearance zone 32 annularly
And the metal conduction band being connected with the non-clearance zone of printed substrate 1, monopole antenna 2 includes feed arm 22 and radiation arm 23, feedback
One end of electric arm 22 is connected with the first feed of printed substrate 1, and the other end is connected with radiation arm 23.
Wherein, feed arm 22 is positioned in the range of above the printed substrate 1 of clearance zone 32 correspondence, that is, from the Z of Fig. 1
Direction, axle place is looked down, and the projection of feed arm 22 is positioned within the scope of clearance zone 32 place.
This antenna concrete structure sees embodiments discussed below:
Embodiment one:
Referring again to Fig. 1, the present embodiment is as a example by the WIFI antenna of the 2.4GHz of high-isolation, specific as follows:
Active antenna annularly 3 in the present embodiment and monopole antenna 2 are arranged at the edge of the side of printed substrate 1
Place, and active antenna 3 is printed on the edge of printed substrate 1 annularly.Wherein, the metal conduction band of active antenna 3 annularly
Including grounded metal conduction band 34 and feed metal conduction band 33, grounded metal conduction band 34 and feed metal conduction band 33 respectively with track
The ground level of road plate 11 is connected.One end of feed metal conduction band 33 is connected with the ground level of printed substrate 1 by electric capacity 35, feedback
The other end of electric metal conduction band 33 is directly located on the feed 31 of the side adjacent with printed substrate 1 edge of clearance zone 32
Connecting, one end of grounded metal conduction band 34 is connected with the ground level of printed substrate 1 by electric capacity 36, and the other end directly and prints
Wiring board 1 is connected.The operation principle of active antenna is annularly: utilize the current emissions of magnetic field coupling excitation printed substrate 1,
The ground level inductance of printed substrate 1 and electric capacity 36 constitute radiation resonant tank, and therefore, the capacitance of electric capacity 36 affects resonance frequency
, there is magnetic field between feed metal conduction band 33 with grounded metal conduction band 34 and couple in rate, shows as mutual inductance, electric capacity 34 meeting on circuit
Impact mutual inductance size between the two, thus affect notch depth.
Preferably, the monopole antenna 2 in the present embodiment is set to symmetric arms monopole antenna, and its radiation arm 23 is symmetrical
Radiation arm, the other end of feed arm 22 is connected with the middle of symmetric radiation arm.The symmetric radiation arm of symmetric arms monopole antenna
And the open coupled electric field between printed substrate can form Net long wave radiation, the length adjusting symmetric radiation arm can realize institute
The resonant frequency needed.And adjust the position of the first feed, it is possible to realize reaching optimal isolation degree.
Adjust radiation arm can realize obtaining optimal isolation relative to the relative position of clearance zone.In the present embodiment, feedback
Electric arm 22 is positioned at the surface of the centrage of clearance zone 32.That is, look down from the direction, Z axis place of Fig. 1, the throwing of feed arm 22
Shadow overlaps with the centrage (dotted line in Fig. 1) of clearance zone 32.In other preferred embodiments, as long as feed arm 22 is positioned at headroom
In the range of district 32 upper area, and by adjusting each device (such as the position of feed, the value of electric capacity, the form of metal conduction band
Deng) position, structure and parameter etc. realize optimal isolation degree.
With reference to the return loss simulation result that Fig. 3 is symmetric arms monopole antenna and active antenna annularly, by tuning
The length of the radiation arm 23 of symmetric arms monopole antenna and electric capacity 35,36 so that two kinds of antennas cover 2.4～
2.48GHz, in emulation a length of 20 millimeters of symmetric arms monopole antenna, the clearance zone of active antenna a size of 5* annularly
3mm, electric capacity 35,36 is all 0.5pF.
With reference to the global radiation efficiency that Fig. 4 is symmetric arms monopole antenna and active antenna annularly, from the point of view of simulation result,
The global radiation efficiency of two antennas is more than-1dB.
It is symmetric arms monopole antenna and isolation between active antenna annularly with reference to Fig. 5, from the point of view of simulation result,
Isolation between the two is less than 15dB in band.
It is for symmetric arms monopole antenna and envelope correlation coefficient between active antenna annularly with reference to Fig. 6, in band
Less than 0.01.
The principle of the present invention can show symmetric arms monopole sky by explaining with reference to figure with reference to Fig. 7 with reference to Fig. 7
Current phasor scattergram on printed substrate when lineman makees, from the figure, it can be seen that current phasor centered by distributing point to
Outer radial dissipates, with reference to Fig. 8 show annularly radiant body Antenna Operation time printed substrate on CURRENT DISTRIBUTION, permissible from figure
Seeing, current phasor is circumferentially around distribution centered by distributing point, and two compare, it is easy to find, symmetric arms monopole sky
It is that near normal is orthogonal everywhere that line is distributed at earth-current with active antenna annularly, it means that, near field between the two
Energy coupling is the most weak.Based on this feature, monopole antenna is combined with radiant body antenna annularly.
Specifically, understand based on the current phasor figure shown in reality application and above-mentioned Fig. 7 and Fig. 8, affect symmetric arms one pole
The principal element of the isolation between sub antenna and annularly radiant body antenna includes the distance between two antennas and symmetric arms
The symmetry of monopole antenna.It is different from traditional antenna, annularly the isolation between active antenna and symmetric arms monopole antenna
Degree does not increase with distance between the two and reduces, and on the contrary, when both are closest, isolation between antennas is maximum.
As it is shown in figure 9, which show annularly between active antenna and symmetric arms monopole antenna isolation with antenna it
The situation of spacing change, wherein, distance between the two refers to both distances on y direction in FIG.Can from result
Arrive, when two antenna y direction distances are 0, i.e. look down above printed substrate, annularly the center of active antenna clearance zone
When line overlaps with the centrage (feed arm) of monopole antenna, the isolation between two antennas is best.Its reason is: two antennas
The eradiation current pattern caused is symmetrical about the centrage of antenna, and direction is different, when two aerial positions overlap, respectively
Place's electric current is orthogonal, and therefore isolation is best, and when aerial position is misaligned, electric current is it cannot be guaranteed that orthogonal everywhere, every
Therefore it is deteriorated from degree.Additionally, when the symmetry of symmetric arms monopole antenna is poor, that is during feed arm deviation radiation arm central authorities,
Isolation between two antennas also can be deteriorated, this also in that, feed arm skew its earth-current of monopole antenna no longer with ring
The earth-current of shape eradiation body antenna is orthogonal.
Embodiment two:
The present embodiment is the conversion embodiment of embodiment one, its divided by lower part content and embodiment one otherwise varied outside,
The technical scheme of remainder is all identical with the detailed description of the invention of embodiment one, and the present embodiment is specific as follows:
As shown in Figure 10, one end of the feed metal conduction band 33 in the present embodiment is by electric capacity 35 and printed substrate 1
Ground level is connected, and the other end is vertically with the feed 31 of the side relative with printed substrate 1 edge being positioned at clearance zone 32 even
Connect；The two ends of grounded metal conduction band 34 are connected with printed substrate 1 and the centre of grounded metal conduction band 34 is provided with electric capacity 36.By
It is arranged on the centre of grounded metal conduction band 34 in electric capacity 36 so that this antenna symmetry is more preferable, thus current phasor is distributed the most more
Add symmetry, uniformly, can further improve the isolation of two antennas.Required resonance frequency can be realized by adjusting electric capacity 36
Rate, the resonance impedance needed by adjusting electric capacity 35 to realize.
Embodiment three:
The present embodiment is the conversion embodiment of embodiment one, its divided by lower part content and embodiment one otherwise varied outside,
The technical scheme of remainder is all identical with the detailed description of the invention of embodiment one, and the present embodiment is specific as follows:
As shown in figure 11, the feed metal conduction band 33 in the present embodiment is positioned at inside clearance zone, its one end and printed wire
Feed 31 on plate 1 connects, and the other end vertically one end with grounded metal conduction band 34 is connected, the centre of feed metal conduction band 33
Position is provided with inductance 37, and the other end of grounded metal conduction band 34 is connected with the ground level of printed substrate 1 by electric capacity 36.Its
In, electric capacity 36 is distributed capacitor, and in other preferred embodiments, distributed capacitor 36 can be replaced lumped capacity.Inductance 37
Being alternatively lumped inductance or distributed inductance, it can play the effect of feed shunting.By adjusting inductance 37 or adjusting feed
Metal conduction band can realize required resonance impedance with the distance of clearance zone side.Lead owing to electric capacity 36 is arranged on grounded metal
With the centre of 34 so that this antenna symmetry is more preferable, thus current phasor distribution is the most symmetrical, uniform, can further improve
The isolation of two antennas.Required resonant frequency can be realized by adjusting electric capacity 36.
In other preferred embodiments, the structure of active antenna can also have other various deformation, such as metal annularly
Conduction band can be set to the metal conduction band structure of multiple-limb, and the metal conduction band structure of this multiple-limb can be as desired by electric capacity and print
The non-empty regions of brush wiring board is connected, to constitute the resonant tank of antenna.The present invention does not limit the various deformation of metal conduction band
Mode, those skilled in the art's active antenna annularly based on the application is combined with monopole antenna to improve the side of isolation
Case, and to the various deformation done by active antenna annularly or monopole antenna, within should be included in the scope of the present invention.
The above, the only detailed description of the invention of the present invention, but protection scope of the present invention is not limited thereto, and any
Those skilled in the art in the technical scope that the invention discloses, the deformation that the present invention is done or replacement, all should contain
Within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with described scope of the claims.
Claims (8)
1. a compact type high-isolation antenna, it is characterised in that include printed substrate, described printed substrate is provided with
Active antenna annularly, described active antenna annularly be provided above monopole antenna, described active antenna bag annularly
In including a clearance zone being arranged on printed substrate and being located at described clearance zone and it is connected with the non-clearance zone of printed substrate
Metal conduction band, described monopole antenna includes feed arm and radiation arm, described feed arm one end and described printed substrate
First feed is connected, and the other end is connected with described radiation arm；
Wherein, described feed arm is positioned in the range of above the printed substrate that described clearance zone is corresponding.
Compact type high-isolation antenna the most according to claim 1, it is characterised in that described feed arm is positioned at described headroom
The surface of the centrage in district.
Compact type high-isolation antenna the most according to claim 1, it is characterised in that described monopole antenna is symmetric arms
Monopole antenna, described radiation arm is symmetric radiation arm, the other end of described feed arm and the middle of described symmetric radiation arm
It is connected.
Compact type high-isolation antenna the most according to claim 1, it is characterised in that described active antenna annularly and right
Title arm monopole antenna is arranged at the edge of the side of described printed substrate, and described active antenna annularly is printed on institute
State on the edge of printed substrate.
Compact type high-isolation antenna the most according to claim 1, it is characterised in that described metal conduction band includes ground connection gold
Belong to conduction band and feed metal conduction band, described grounded metal conduction band and feed metal conduction band respectively with the Horizon of described printed substrate
Face is connected.
Compact type high-isolation antenna the most according to claim 5, it is characterised in that one end of described feed metal conduction band
Being connected by the ground level of the first electric capacity with described printed substrate, the other end is that be directly located on clearance zone with described printing
Second feed of the side that wiring board edge is adjacent connects, and one end of described grounded metal conduction band is by the second electric capacity and described print
The ground level of brush wiring board is connected, and the other end is directly connected with described printed substrate.
Compact type high-isolation antenna the most according to claim 5, it is characterised in that one end of described feed metal conduction band
Be connected by the ground level of the first electric capacity with described printed substrate, the other end vertically be positioned at described clearance zone with described
Second feed of the side that printed substrate edge is relative connects；Described grounded metal conduction band two ends and described printed substrate phase
Connect and the centre of described grounded metal conduction band is provided with the second electric capacity.
Compact type high-isolation antenna the most according to claim 5, it is characterised in that one end of described feed metal conduction band
Being connected with the second feed on described printed substrate, the other end vertically one end with described grounded metal conduction band is connected, institute
The centre position stating feed metal conduction band is provided with inductance, and the other end of described grounded metal conduction band is by electric capacity and described track
The ground level of road plate is connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610784913.6A CN106252848B (en) | 2016-08-30 | 2016-08-30 | Compact high-isolation antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610784913.6A CN106252848B (en) | 2016-08-30 | 2016-08-30 | Compact high-isolation antenna |
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| Publication Number | Publication Date |
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| CN106252848A true CN106252848A (en) | 2016-12-21 |
| CN106252848B CN106252848B (en) | 2020-01-10 |
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| CN201610784913.6A Active CN106252848B (en) | 2016-08-30 | 2016-08-30 | Compact high-isolation antenna |
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Cited By (10)
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| CN107275781A (en) * | 2017-06-23 | 2017-10-20 | 曲龙跃 | A kind of separate type loop aerial for stacked conducting plate |
| CN111430900A (en) * | 2020-04-30 | 2020-07-17 | 曲龙跃 | All-printed ground radiation antenna system |
| CN112448163A (en) * | 2019-08-10 | 2021-03-05 | 深圳市卓睿通信技术有限公司 | High-isolation antenna pair and MIMO antenna system |
| WO2021082935A1 (en) * | 2019-10-31 | 2021-05-06 | 华为技术有限公司 | Electronic apparatus |
| WO2021213125A1 (en) * | 2020-04-22 | 2021-10-28 | 华为技术有限公司 | Antenna unit and electronic device |
| CN114447595A (en) * | 2022-01-13 | 2022-05-06 | 西安电子科技大学 | Dual-port loop antenna and mobile terminal equipment with zero headroom and high isolation |
| WO2023016353A1 (en) * | 2021-08-12 | 2023-02-16 | 华为技术有限公司 | Antenna structure and electronic device |
| CN115708260A (en) * | 2021-08-20 | 2023-02-21 | 荣耀终端有限公司 | Terminal dipole antenna of coupling feed |
| CN116169469A (en) * | 2021-11-25 | 2023-05-26 | 北京小米移动软件有限公司 | Antennas and Bluetooth devices |
| US20230187827A1 (en) * | 2020-04-06 | 2023-06-15 | Huawei Technologies Co., Ltd. | Dual Mode Antenna Arrangement |
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| WO2021213125A1 (en) * | 2020-04-22 | 2021-10-28 | 华为技术有限公司 | Antenna unit and electronic device |
| CN111430900A (en) * | 2020-04-30 | 2020-07-17 | 曲龙跃 | All-printed ground radiation antenna system |
| WO2023016353A1 (en) * | 2021-08-12 | 2023-02-16 | 华为技术有限公司 | Antenna structure and electronic device |
| CN115708260A (en) * | 2021-08-20 | 2023-02-21 | 荣耀终端有限公司 | Terminal dipole antenna of coupling feed |
| CN116169469A (en) * | 2021-11-25 | 2023-05-26 | 北京小米移动软件有限公司 | Antennas and Bluetooth devices |
| CN114447595A (en) * | 2022-01-13 | 2022-05-06 | 西安电子科技大学 | Dual-port loop antenna and mobile terminal equipment with zero headroom and high isolation |
| CN114447595B (en) * | 2022-01-13 | 2023-03-21 | 西安电子科技大学 | Double-port-ring antenna with zero clearance and high isolation characteristics and mobile terminal equipment |
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