EP3920328A1 - Dual-frequency antenna - Google Patents
Dual-frequency antenna Download PDFInfo
- Publication number
- EP3920328A1 EP3920328A1 EP19912442.1A EP19912442A EP3920328A1 EP 3920328 A1 EP3920328 A1 EP 3920328A1 EP 19912442 A EP19912442 A EP 19912442A EP 3920328 A1 EP3920328 A1 EP 3920328A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- dual
- conduction band
- frequency antenna
- metal conduction
- clearance area
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000002184 metal Substances 0.000 claims abstract description 57
- 239000003990 capacitor Substances 0.000 claims abstract description 24
- 230000005284 excitation Effects 0.000 claims abstract description 16
- 238000012360 testing method Methods 0.000 claims description 7
- IYZWUWBAFUBNCH-UHFFFAOYSA-N 2,6-dichlorobiphenyl Chemical compound ClC1=CC=CC(Cl)=C1C1=CC=CC=C1 IYZWUWBAFUBNCH-UHFFFAOYSA-N 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 230000001788 irregular Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
- H01Q7/005—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop with variable reactance for tuning the antenna
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/30—Arrangements for providing operation on different wavebands
- H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
- H01Q5/314—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors
- H01Q5/321—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors within a radiating element or between connected radiating elements
Definitions
- This application relates to the technical field of wireless local area networks, in particular to a dual-frequency antenna.
- the current antennas usually achieves dual-frequency resonance through multi-branch wires. Wiring of the antenna with this structure occupies a larger space on a PCB (Printed Circuit Board), which causes the overall size of antenna to be too large to satisfy the miniaturization design. Further, it is difficult to adjust the resonance frequency band of the antennas whose dual-frequency resonance is achieved through the multi-branch wires.
- PCB Print Circuit Board
- An object of an embodiment of the present application is to provide a dual-frequency antenna, which can achieve dual-frequency resonance merely by means of one metal conduction band on which capacitors are connected in series, and can solve the problems that the space occupied by a multi-branch multi-path structure is large, its size is relatively large and its resonant frequency band is difficult to adjust.
- the specific technical solutions are as follows:
- An embodiment of the present application provides a dual-frequency antenna, which includes:
- the dual-frequency antenna includes a plurality of capacitors connected in series on the single-path metal conduction band.
- the clearance area is arranged at an edge of the PCB, and the terminal end and the excitation end of the single-path metal conduction band are located near an opening side of the clearance area.
- the dual-frequency antenna further includes a microstrip line which is disposed in the non-clearance area and to which the excitation end of the single-path metal conduction band is electrically connected.
- the dual-frequency antenna further includes: a test connector connected in series with the capacitor on the single-path metal conduction band and arranged close to the excitation end of the single-path metal conduction band.
- test connector is a resistor which is connected in series on the single-path metal conduction band and whose resistance value is zero.
- the single-path metal conduction band is arranged within the clearance area in a stacked reciprocating manner.
- a dual-frequency antenna includes a PCB, a single-path metal conduction band, and a capacitor.
- the PCB is provided with a clearance area and a non-clearance area, wherein the clearance area is formed in an area without metal or wires and the like on the PCB, and the non-clearance area is located outside the clearance.
- the single-path metal conduction band refers to one metal conduction band which only forms one path without branches.
- the single-path metal conduction band is arranged within the clearance area, and a terminal end of the single-path metal conduction band is electrically connected to a ground end of the PCB to form a loop antenna, so that high-frequency resonance of the dual-frequency antenna can be realized.
- the capacitor is connected between an excitation end and the terminal end of the single-path metal conduction band, so that low-frequency resonance of the dual-frequency antenna can be realized.
- the dual-frequency antenna can realize dual-frequency resonance through the single-path metal conduction band and capacitors, which is simple in structure and can adjust the high-frequency resonance by adjusting the length of the single-path metal conduction band and the area of the clearance area, and can adjust the low-frequency resonance by adjusting the capacitance value of the capacitor, which effectively simplifies the resonance adjustment of the antenna.
- FIG. 1 is a schematic structural diagram of a dual-frequency antenna according to a specific embodiment of the present application.
- the present application provides a dual-frequency antenna comprising a PCB 10, a single-path metal conduction band 20 and a capacitor 30.
- the PCB 10 is provided with a clearance area 1a and a non-clearance area 2a, wherein the clearance area 1a is formed in an area without metal or wires and the like on the PCB 10, and the non-clearance area 2a is outside the clearance area.
- the single-path metal conduction band 20 refers to one metal conduction band which only forms one path without branches.
- the single-path metal conduction band 20 is arranged within the clearance area 1a, and a terminal end of the single-path metal conduction band 20 is electrically connected to a ground end of the PCB 10 to form a loop antenna, so that high-frequency resonance of the dual-frequency antenna can be realized.
- the capacitor 30 is connected between an excitation end and the terminal end of the single-path metal conduction band 20, so that low-frequency resonance of the dual-frequency antenna can be realized.
- the dual-frequency antenna can realize dual-frequency resonance through the single-path metal conduction band 20 and the capacitor 30, which is simple in structure.
- the high-frequency resonance can be adjusted by adjusting the length of the single-path metal conduction band 20 and the area of the clearance area 1a. Specifically, the high-frequency resonance can be adjusted by increasing the length of the single-path metal conduction band 20 with the area of the clearance area 1a unchanged. For example, in the case that the terminal end 21 and the excitation end 22 of the single-path metal conduction band 20 are kept unchanged, the high-frequency resonance can be adjusted by increasing the length of the single-path metal conduction band 20, in which the single-path metal conduction band 20 is disposed within the clearance area 1a in a wave shape or in a stacked reciprocating manner.
- the low-frequency resonance can be adjusted by adjusting the capacitance value of the capacitor 30, and the capacitance value of the capacitor 30 is set according to the required low-frequency resonance point in order to meet the requirements of different low-frequency resonance points, which effectively simplifies the resonance adjustment of the antenna.
- the dual-frequency antenna includes a plurality of capacitors 30, which are connected in series on the single-path metal conduction band 20.
- three capacitors 30 are connected in series on the single-path metal conduction band 20, as shown in Fig. 1 .
- a plurality of capacitors 30 are connected in series, so that the low-frequency resonance can be accurately adjusted, fine adjustments can be reliably realized, and the requirements on a low-frequency resonance point can be fully met.
- the clearance area 1a is arranged at an edge of the PCB 10, and the terminal end and the excitation end of the single-path metal conduction band 20 are located near an opening side of the clearance area 1a, so that a distance between the single-path metal conduction band 20 and the non-clearance area 2a in a direction perpendicular to the opening side can be increased, thereby the single-path metal conduction band 20 is located far away from the metal, further optimizing the operating performance of the antenna.
- Fig. 1 only shows one specific shape of the clearance area 1a, and the shape of the clearance area 1a is not limited to the square shape in the figure, and can also be a semicircular shape, an irregular shape, etc., as long as the PCB 10 can be fully utilized and the utilization rate of the clearance area 1a can be optimized.
- the dual-frequency antenna further includes a microstrip line 40 disposed in the non-clearance area 2a.
- the excitation end of the single-path metal conduction band 20 is electrically connected to the microstrip line 40, so as to be connected to a radio frequency chip or other devices through the microstrip line 40.
- the dual-frequency antenna further includes a test connector, which is connected in series with the capacitor 30 on the single-path metal conduction band 20 and is arranged close to the excitation end of the single-path metal conduction band 20.
- the test connector is a resistor with a resistance value of zero.
- the resistor is used to form the connection end for testing the dual-frequency antenna.
- the dual-frequency antenna can achieve dual-frequency resonance merely by means of a metal conduction band on which capacitors 30 are connected in series, and can solve the problems in the prior art that the space occupied by a multi-branch multi-path structure is large, its size is relatively large, and its resonant frequency band is difficult to adjust.
- Fig. 2 is a return loss curve of the dual-frequency antenna in the specific embodiment of the present invention
- Fig. 3 is a schematic diagram illustrating the efficiency of a dual-frequency antenna in an specific embodiment of the present application.
- the dual-frequency antenna with the above structure can achieve good electrical performance in a frequency band of 2.4 GHz-2.5 GHz and a frequency band of 5 GHz-5.8 GHz.
- the efficiency of the dual-frequency antenna according to the present application can reach more than 80% in the frequency band of 2.4 GHz-2.5 GHz, and more than 40% in the frequency band of 5 GHz-5.8 GHz.
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- Waveguide Aerials (AREA)
- Variable-Direction Aerials And Aerial Arrays (AREA)
Abstract
Description
- The present application claims the priority to a
Chinese patent application No.201920139308.2, filed with the China National Intellectual Property Administration on January 28, 2019 - This application relates to the technical field of wireless local area networks, in particular to a dual-frequency antenna.
- The current antennas usually achieves dual-frequency resonance through multi-branch wires. Wiring of the antenna with this structure occupies a larger space on a PCB (Printed Circuit Board), which causes the overall size of antenna to be too large to satisfy the miniaturization design. Further, it is difficult to adjust the resonance frequency band of the antennas whose dual-frequency resonance is achieved through the multi-branch wires.
- Accordingly, it is highly desirable to optimize the design of the dual-frequency antenna to provide a dual-frequency antenna with a small size and with a resonant frequency band easy to adjust.
- An object of an embodiment of the present application is to provide a dual-frequency antenna, which can achieve dual-frequency resonance merely by means of one metal conduction band on which capacitors are connected in series, and can solve the problems that the space occupied by a multi-branch multi-path structure is large, its size is relatively large and its resonant frequency band is difficult to adjust. The specific technical solutions are as follows:
An embodiment of the present application provides a dual-frequency antenna, which includes: - a PCB provided with a clearance area and a non-clearance area;
- a single-path metal conduction band which is arranged within the clearance area and a terminal end of which is electrically connected to a ground end of the PCB; and
- a capacitor connected between an excitation end and the terminal end of the single-path metal conduction band.
- Optionally, the dual-frequency antenna includes a plurality of capacitors connected in series on the single-path metal conduction band.
- Optionally, the clearance area is arranged at an edge of the PCB, and the terminal end and the excitation end of the single-path metal conduction band are located near an opening side of the clearance area.
- Optionally, the dual-frequency antenna further includes a microstrip line which is disposed in the non-clearance area and to which the excitation end of the single-path metal conduction band is electrically connected.
- Optionally, the dual-frequency antenna further includes:
a test connector connected in series with the capacitor on the single-path metal conduction band and arranged close to the excitation end of the single-path metal conduction band. - Optionally, the test connector is a resistor which is connected in series on the single-path metal conduction band and whose resistance value is zero.
- Optionally, the single-path metal conduction band is arranged within the clearance area in a stacked reciprocating manner.
- It can be seen that, based on the above-mentioned embodiments, a dual-frequency antenna includes a PCB, a single-path metal conduction band, and a capacitor. The PCB is provided with a clearance area and a non-clearance area, wherein the clearance area is formed in an area without metal or wires and the like on the PCB, and the non-clearance area is located outside the clearance. The single-path metal conduction band refers to one metal conduction band which only forms one path without branches. The single-path metal conduction band is arranged within the clearance area, and a terminal end of the single-path metal conduction band is electrically connected to a ground end of the PCB to form a loop antenna, so that high-frequency resonance of the dual-frequency antenna can be realized. The capacitor is connected between an excitation end and the terminal end of the single-path metal conduction band, so that low-frequency resonance of the dual-frequency antenna can be realized.
- Compared with a dual-frequency antenna realized though a multi-branch metal conduction band, the dual-frequency antenna can realize dual-frequency resonance through the single-path metal conduction band and capacitors, which is simple in structure and can adjust the high-frequency resonance by adjusting the length of the single-path metal conduction band and the area of the clearance area, and can adjust the low-frequency resonance by adjusting the capacitance value of the capacitor, which effectively simplifies the resonance adjustment of the antenna.
- In order to illustrate the embodiments of the present application and the technical solutions of the prior art more clearly, the drawings used in the embodiments and the prior art are briefly described below. It is obvious that the drawings in the following description are merely some embodiments of the present application, and other drawings can be obtained by those skilled in the art based on to the drawings without creative efforts.
-
Fig. 1 is a schematic structural diagram of a dual-frequency antenna according to a specific embodiment of the present application; -
Fig 2 is a return loss curve of a dual-frequency antenna according to a specific embodiment of the present application; -
Fig. 3 is a schematic diagram illustrating the efficiency of a dual-frequency antenna according to a specific embodiment of the present application. - Reference signs: 10- PCB, 20- a single-path metal conduction band, 21- terminal end, 22- an excitation end, 30- a capacitor, 40- a microstrip line, 1a- a clearance area, 2a- a non-clearance area.
- In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be described in more details with reference to the accompanying drawings and embodiments below. It should be apparent that the described embodiments are only some of the embodiments of the present application instead of all of them. All other embodiments obtained by those skilled in the art based on the embodiments herein without creative efforts shall fall within the protection scope of this application.
- In order to describe a dual-frequency antenna provided in the present application in detail, the structure and operation principle of the dual-frequency antenna will be described in detail below with reference to the accompanying drawings.
- As shown in
Fig. 1 , which is a schematic structural diagram of a dual-frequency antenna according to a specific embodiment of the present application. - In a specific embodiment, the present application provides a dual-frequency antenna comprising a
PCB 10, a single-path metal conduction band 20 and acapacitor 30. As shown inFig. 1 , thePCB 10 is provided with a clearance area 1a and anon-clearance area 2a, wherein the clearance area 1a is formed in an area without metal or wires and the like on thePCB 10, and thenon-clearance area 2a is outside the clearance area. The single-path metal conduction band 20 refers to one metal conduction band which only forms one path without branches. The single-path metal conduction band 20 is arranged within the clearance area 1a, and a terminal end of the single-path metal conduction band 20 is electrically connected to a ground end of thePCB 10 to form a loop antenna, so that high-frequency resonance of the dual-frequency antenna can be realized. Thecapacitor 30 is connected between an excitation end and the terminal end of the single-path metal conduction band 20, so that low-frequency resonance of the dual-frequency antenna can be realized. - Compared with a dual-frequency antenna realized though a multi-branch metal conduction band, the dual-frequency antenna can realize dual-frequency resonance through the single-path metal conduction band 20 and the
capacitor 30, which is simple in structure. - The high-frequency resonance can be adjusted by adjusting the length of the single-path metal conduction band 20 and the area of the clearance area 1a. Specifically, the high-frequency resonance can be adjusted by increasing the length of the single-path metal conduction band 20 with the area of the clearance area 1a unchanged. For example, in the case that the
terminal end 21 and the excitation end 22 of the single-path metal conduction band 20 are kept unchanged, the high-frequency resonance can be adjusted by increasing the length of the single-path metal conduction band 20, in which the single-path metal conduction band 20 is disposed within the clearance area 1a in a wave shape or in a stacked reciprocating manner. - The low-frequency resonance can be adjusted by adjusting the capacitance value of the
capacitor 30, and the capacitance value of thecapacitor 30 is set according to the required low-frequency resonance point in order to meet the requirements of different low-frequency resonance points, which effectively simplifies the resonance adjustment of the antenna. - Further, the dual-frequency antenna includes a plurality of
capacitors 30, which are connected in series on the single-path metal conduction band 20. - In a specific embodiment, three
capacitors 30 are connected in series on the single-path metal conduction band 20, as shown inFig. 1 . Preferably, a plurality ofcapacitors 30 are connected in series, so that the low-frequency resonance can be accurately adjusted, fine adjustments can be reliably realized, and the requirements on a low-frequency resonance point can be fully met. - As shown in
Fig. 1 , the clearance area 1a is arranged at an edge of thePCB 10, and the terminal end and the excitation end of the single-path metal conduction band 20 are located near an opening side of the clearance area 1a, so that a distance between the single-path metal conduction band 20 and thenon-clearance area 2a in a direction perpendicular to the opening side can be increased, thereby the single-path metal conduction band 20 is located far away from the metal, further optimizing the operating performance of the antenna. -
Fig. 1 only shows one specific shape of the clearance area 1a, and the shape of the clearance area 1a is not limited to the square shape in the figure, and can also be a semicircular shape, an irregular shape, etc., as long as thePCB 10 can be fully utilized and the utilization rate of the clearance area 1a can be optimized. - Further, as shown in
Fig. 1 , the dual-frequency antenna further includes amicrostrip line 40 disposed in thenon-clearance area 2a. The excitation end of the single-path metal conduction band 20 is electrically connected to themicrostrip line 40, so as to be connected to a radio frequency chip or other devices through themicrostrip line 40. - Based on the above embodiments, the dual-frequency antenna further includes a test connector, which is connected in series with the
capacitor 30 on the single-path metal conduction band 20 and is arranged close to the excitation end of the single-path metal conduction band 20. - In a specific embodiment, the test connector is a resistor with a resistance value of zero. The resistor is used to form the connection end for testing the dual-frequency antenna.
- Based on the above structure, the dual-frequency antenna can achieve dual-frequency resonance merely by means of a metal conduction band on which
capacitors 30 are connected in series, and can solve the problems in the prior art that the space occupied by a multi-branch multi-path structure is large, its size is relatively large, and its resonant frequency band is difficult to adjust. - The performance of the dual-frequency antenna in the specific embodiment of the present invention is described below with reference to
Figs. 2 and3 .Fig. 2 is a return loss curve of the dual-frequency antenna in the specific embodiment of the present invention, andFig. 3 is a schematic diagram illustrating the efficiency of a dual-frequency antenna in an specific embodiment of the present application. - As shown in
Fig. 2 , the dual-frequency antenna with the above structure can achieve good electrical performance in a frequency band of 2.4 GHz-2.5 GHz and a frequency band of 5 GHz-5.8 GHz. As shown inFig. 3 , the efficiency of the dual-frequency antenna according to the present application can reach more than 80% in the frequency band of 2.4 GHz-2.5 GHz, and more than 40% in the frequency band of 5 GHz-5.8 GHz. - It should be noted that, in this application, relational terms such as first and second, and the like are merely used to distinguish one entity or operation from another entity or operation without necessarily requiring or implying any such actual relationship or order between such entities or operations. Also, the terms "comprise", "include," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or include elements inherent to inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that comprises said element.
- The above description is only preferred embodiments of the present application and should not intended to limit the present application, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present application should be included in the scope of the present application.
Claims (7)
- A dual-frequency antenna, comprising:a PCB provided with a clearance area and a non-clearance area;a single-path metal conduction band which is arranged within the clearance area and a terminal end of which is electrically connected to a ground end of the PCB; anda capacitor connected between an excitation end and the terminal end of the single-path metal conduction band.
- The dual-frequency antenna of claim 1, wherein the dual-frequency antenna comprises a plurality of capacitors connected in series on the single-path metal conduction band.
- The dual-frequency antenna of claim 1, wherein the clearance area is arranged at an edge of the PCB, and the terminal end and the excitation end of the single-path metal conduction band are located near an opening side of the clearance area.
- The dual-frequency antenna of claim 1, wherein the dual-frequency antenna further comprises a microstrip line which is disposed in the non-clearance area and to which the excitation end of the single-path metal conduction band is electrically connected.
- The dual-frequency antenna of any one of claims 1 to 4, wherein the dual-frequency antenna further comprises:
a test connector connected in series with the capacitor on the single-path metal conduction band and arranged close to the excitation end of the single-path metal conduction band. - The dual-frequency antenna of claim 5, wherein the test connector is a resistor which is connected in series on the single-path metal conduction band and whose resistance value is zero.
- The dual-frequency antenna of claim 1, wherein the single-path metal conduction band is arranged within the clearance area in a stacked reciprocating manner.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201920139308.2U CN209329151U (en) | 2019-01-28 | 2019-01-28 | A kind of dual-band antenna |
PCT/CN2019/129245 WO2020155986A1 (en) | 2019-01-28 | 2019-12-27 | Dual-frequency antenna |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3920328A1 true EP3920328A1 (en) | 2021-12-08 |
EP3920328A4 EP3920328A4 (en) | 2022-03-09 |
Family
ID=67731917
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19912442.1A Pending EP3920328A4 (en) | 2019-01-28 | 2019-12-27 | Dual-frequency antenna |
Country Status (3)
Country | Link |
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EP (1) | EP3920328A4 (en) |
CN (1) | CN209329151U (en) |
WO (1) | WO2020155986A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
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CN209329151U (en) * | 2019-01-28 | 2019-08-30 | 杭州海康威视数字技术股份有限公司 | A kind of dual-band antenna |
CN117134107A (en) * | 2022-05-20 | 2023-11-28 | 华为技术有限公司 | Antenna, circuit board and electronic equipment |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3629448B2 (en) * | 2001-07-27 | 2005-03-16 | Tdk株式会社 | ANTENNA DEVICE AND ELECTRONIC DEVICE HAVING THE SAME |
JP4063833B2 (en) * | 2004-06-14 | 2008-03-19 | Necアクセステクニカ株式会社 | Antenna device and portable radio terminal |
US8125399B2 (en) * | 2006-01-14 | 2012-02-28 | Paratek Microwave, Inc. | Adaptively tunable antennas incorporating an external probe to monitor radiated power |
JP2010041071A (en) * | 2008-07-31 | 2010-02-18 | Toshiba Corp | Antenna device |
CN102055076A (en) * | 2009-11-09 | 2011-05-11 | 吴光修 | Dual-frequency PCB antenna |
KR101548970B1 (en) * | 2010-02-11 | 2015-09-02 | 라디나 주식회사 | Ground radiation antenna |
US8648763B2 (en) * | 2010-02-11 | 2014-02-11 | Radina Co., Ltd | Ground radiator using capacitor |
CN202487756U (en) * | 2011-12-29 | 2012-10-10 | 惠州Tcl移动通信有限公司 | Mobile phone and double-frequency resonant antenna thereof |
CN103441333B (en) * | 2013-08-21 | 2017-02-08 | 深圳汉阳天线设计有限公司 | Synchronous dual-frequency circuit board radiating antenna |
ES2968683T3 (en) * | 2014-02-12 | 2024-05-13 | Huawei Device Co Ltd | Antenna and mobile terminal |
CN104795628A (en) * | 2015-04-07 | 2015-07-22 | 上海安费诺永亿通讯电子有限公司 | Terrestrial radiation antenna realizing double-frequency resonance by clearance of PCB (printed circuit board) |
CN209329151U (en) * | 2019-01-28 | 2019-08-30 | 杭州海康威视数字技术股份有限公司 | A kind of dual-band antenna |
-
2019
- 2019-01-28 CN CN201920139308.2U patent/CN209329151U/en active Active
- 2019-12-27 EP EP19912442.1A patent/EP3920328A4/en active Pending
- 2019-12-27 WO PCT/CN2019/129245 patent/WO2020155986A1/en unknown
Also Published As
Publication number | Publication date |
---|---|
WO2020155986A1 (en) | 2020-08-06 |
CN209329151U (en) | 2019-08-30 |
EP3920328A4 (en) | 2022-03-09 |
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