CN209001136U - Helical antenna - Google Patents

Helical antenna Download PDF

Info

Publication number
CN209001136U
CN209001136U CN201821606823.9U CN201821606823U CN209001136U CN 209001136 U CN209001136 U CN 209001136U CN 201821606823 U CN201821606823 U CN 201821606823U CN 209001136 U CN209001136 U CN 209001136U
Authority
CN
China
Prior art keywords
arm
helical
parasitic
circuit board
electrically connected
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.)
Active
Application number
CN201821606823.9U
Other languages
Chinese (zh)
Inventor
蒋俊成
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Beijing Unistrong Science & Technology Co Ltd
Original Assignee
Beijing Unistrong Science & Technology Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Beijing Unistrong Science & Technology Co Ltd filed Critical Beijing Unistrong Science & Technology Co Ltd
Priority to CN201821606823.9U priority Critical patent/CN209001136U/en
Application granted granted Critical
Publication of CN209001136U publication Critical patent/CN209001136U/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Landscapes

  • Details Of Aerials (AREA)
  • Support Of Aerials (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)

Abstract

The utility model discloses a kind of helical antennas, including printed circuit board and radiating principal square on a printed circuit board is set, radiating principal includes at least one principal screw arm and at least one parasitic spiral arm, each principal screw arm corresponds at least one parasitic spiral arm, and each principal screw arm and the parasitic spiral arm corresponding to it are arranged in parallel interval;Wherein, the first end of each principal screw arm with its corresponding to the first end of parasitic spiral arm be electrically connected, to form the feed output end of helical antenna;The equal suspension joint of second end of the second end of principal screw arm and parasitic spiral arm;The length of parasitic spiral arm be greater than with its corresponding to principal screw arm length, and the helix angle of part of the parasitic spiral arm beyond principal screw arm is less than helix angle of the parasitic spiral arm without departing from the part of principal screw arm.The helical antenna of the utility model, frequency bandwidth can be expanded to 6%, also, the structure of helical antenna is more compact.

Description

Helical antenna
Technical Field
The utility model relates to a satellite positioning technical field, concretely relates to helical antenna.
Background
Generally, a global satellite positioning antenna is mostly a microstrip ceramic or microwave dielectric patch antenna based on the theory of microstrip patch antennas, the antenna uses ceramic as a dielectric material to manufacture square or circular antenna patches with different thicknesses, then a low-temperature silver baking process is used on two sides of the antenna patches to form a reflecting surface and a radiating surface, and then a feed pin feeds the reflecting surface and the radiating surface to form a satellite navigation antenna.
However, the above-mentioned positioning antenna has many disadvantages, for example, the ceramic antenna has a high dielectric constant, which results in a narrow frequency bandwidth of the antenna and a large size of the microwave dielectric patch antenna. In addition, the positioning antenna with the structure has very high requirement on the dimensional accuracy of the radiation surface, and the central frequency of the positioning antenna is required to be adjusted in a required frequency range on a network analyzer manually. Moreover, the ceramic material has a high specific gravity, which results in a high weight of the positioning antenna, and the gain of the microstrip patch antenna is also easily affected by the size and shape of the reflective ground plane.
In addition, in the field of unmanned aerial vehicle antennas, the most widely used antenna is a four-turn and half-turn helical antenna based on four wires with each length of lambda/2 proposed by Kilgus of john hopkins university in usa and wound into a half-turn helix. In recent years, a double quad-spiral with two spiral lengths of 1/4 wavelengths has been used, and tuning strips have been added for frequency separation matching.
However, the frequency bandwidth of the helical antenna can only reach 4%, and can only cover GPS \ BDS or GPS \ GLONASS, and the 1/2 four-turn helix with half-turn wavelength belongs to a resonant mode, and only has a narrow frequency band of about 4%, which cannot completely cover the existing mainstream global satellite navigation frequency. And for the 1/4 wavelength four-turn helix, the frequency bandwidth is narrower, the frequency bandwidth is only about 30MHz in the GPS L1, and the frequency of the mainstream satellite positioning system cannot be fully covered.
SUMMERY OF THE UTILITY MODEL
In order to solve the above problem, an embodiment of the present invention provides a helical antenna, which can increase the frequency bandwidth.
The embodiment of the utility model provides a helical antenna, including printed circuit board and the radiation main part of setting above the printed circuit board, the radiation main part includes at least one main spiral arm and at least one parasitic spiral arm, and every main spiral arm corresponds at least one parasitic spiral arm, and every main spiral arm is parallel interval arrangement rather than the parasitic spiral arm that corresponds; wherein,
the first end of each main spiral arm is electrically connected with the first end of the corresponding parasitic spiral arm to form a feed output end of the spiral antenna;
the second end of the main spiral arm and the second end of the parasitic spiral arm are in floating connection;
the length of the parasitic spiral arm is greater than that of the corresponding main spiral arm, and the helix angle of the part of the parasitic spiral arm exceeding the main spiral arm is smaller than that of the part of the parasitic spiral arm not exceeding the main spiral arm.
Optionally, a feed network is disposed on a surface of the printed circuit board facing the radiation body, and a signal processing circuit is disposed on a surface of the printed circuit board facing away from the radiation body; wherein,
the input end of the feed network is electrically connected with the feed output ends, and the output end of the feed network is electrically connected with the input end of the signal processing circuit;
the feed network is used for synthesizing the signals output by the feed output ends to obtain circularly polarized signals;
the signal processing circuit is used for carrying out preset processing on the circularly polarized signal so as to obtain a target signal meeting the requirement.
Optionally, the feed network includes a phase shifter and a balun, an input end of the phase shifter is electrically connected to each of the feed output ends, an output end of the phase shifter is electrically connected to an input end of the balun, and an output end of the balun is electrically connected to an input end of the signal processing circuit.
Optionally, the signal processing circuit comprises a duplex filter, a low noise amplifier, a duplex combiner, and a driver amplifier, wherein,
the input end of the duplex filter is electrically connected with the output end of the feed network, and the output end of the duplex filter is electrically connected with the input end of the low-noise amplifier;
the input end of the duplex combiner is electrically connected with the output end of the low-noise amplifier, and the output end of the duplex combiner is electrically connected with the input end of the driving amplifier;
and the output end of the driving amplifier is used for being electrically connected with a satellite positioning receiver.
Optionally, a via hole penetrating through the printed circuit board in the thickness direction is formed in the printed circuit board, and the input end of the duplex filter is electrically connected with the output end of the feed network through the via hole.
Optionally, the lead angle of the main helical arm ranges from 20 ° to 25 °.
Optionally, the helical antenna further includes a flexible printed circuit board, the flexible printed circuit board is rolled into a cylindrical shape, a conical shape, or a square-cylindrical shape, and the radiation body is wound around an outer circumferential surface of the flexible printed circuit board.
Optionally, the radiation body is formed on the outer circumferential surface of the flexible printed circuit board using a copper plating or low-temperature silver baking process.
Optionally, the radiation body is formed by winding a microstrip line with a wavelength of 0.707 on the outer peripheral surface of the flexible printed circuit board.
Optionally, the thickness of the printed circuit board is in a range of 0.5mm to 2 mm.
Optionally, the radiating body comprises 4 of the main helical arms and 4 of the parasitic helical arms.
Optionally, each parasitic spiral arm exceeds the corresponding main spiral arm by 0.2-0.4 turns.
The utility model provides a helical antenna, radiation subject include at least one main spiral arm and at least one parasitic spiral arm, and every main spiral arm is parallel interval setting rather than the parasitic spiral arm that corresponds, and like this, main spiral arm can make the resonance in the higher frequency section of frequency, and parasitic spiral arm can make the resonance in the lower frequency section of frequency to can make helical antenna's frequency bandwidth enlarge to 6%, reach the purpose that covers dual-frenquency GPS \ BDS \ GLONASS satellite navigation frequency and L-Band frequency. In addition, the helix angle of the part of the parasitic spiral arm, which exceeds the main spiral arm, is smaller than the helix angle of the part of the parasitic spiral arm, which does not exceed the main spiral arm, so that the size of the helical antenna can be reduced as much as possible under the condition of ensuring the necessary performance of the helical antenna, and the structure of the helical antenna is more compact.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:
fig. 1 is a schematic structural diagram of a helical antenna according to a first embodiment of the present invention;
fig. 2 is a schematic structural view of a second embodiment of the present invention, wherein the radiation body is in a flattened state;
fig. 3 is a schematic structural diagram of a feed network according to a third embodiment of the present invention;
fig. 4 is a schematic circuit diagram of a helical antenna according to a fourth embodiment of the present invention;
fig. 5 is a high-band gain pattern of a helical antenna according to a fifth embodiment of the present invention;
fig. 6 is a low-band gain pattern of a helical antenna according to a sixth embodiment of the present invention;
fig. 7 is a schematic diagram of a feeding point S parameter of a helical antenna according to a seventh embodiment of the present invention;
fig. 8 is a schematic diagram of a polarization axis ratio of the helical antenna according to the eighth embodiment of the present invention.
100-a helical antenna; 110-a printed circuit board; 111-a feed network; 111 a-phase shifter; 111 b-balun; 120-a radiating body; 121-main helical arm; 122-parasitic spiral arm; 130-duplex filters; 140-a low noise amplifier; 150-a filter; 160-a duplex combiner; 170-flexible printed circuit board; 180-driver amplifier; 200-satellite positioning receiver.
Detailed Description
The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and are not to be construed as limiting the invention. It should be noted that, for convenience of description, only the parts related to the creation of the invention are shown in the drawings.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
As shown in fig. 1 and 2, the present invention relates to a helical antenna 100, the helical antenna 100 includes a printed circuit board 110 and a radiation body 120 disposed above the printed circuit board 110, the radiation body 120 includes at least one main helical arm 121 and at least one parasitic helical arm 122, wherein each main helical arm 121 corresponds to at least one parasitic helical arm 122, and each main helical arm 121 is disposed in parallel with the corresponding parasitic helical arm 122 at an interval, a first end of each main helical arm 121 is electrically connected to a first end of the corresponding parasitic helical arm 122 to form a feed output out of the helical antenna 100, a second end of each main helical arm 121 and a second end of the parasitic helical arm 122 are both in a floating connection, where the second end of the main helical arm 121 and the second end of the parasitic helical arm 122 are both in an open circuit state, and a length of the parasitic helical arm 122 is greater than a length of the corresponding main helical arm 121, and a rising angle β of a portion of the parasitic helical arm 122 exceeding the main helical arm 121 is smaller than a rising angle α of the parasitic helical arm 122.
Specifically, as shown in fig. 1, the radiating body 120 of the helical antenna 100 may include 4 main helical arms 121 and 4 parasitic helical arms 122, and of course, other numbers of main helical arms 121 and parasitic helical arms 122 may be selected according to actual needs, and the first ends of the 4 main helical arms 121 (as shown in fig. 1, the end close to the printed circuit board 110) and the first ends of the parasitic helical arms 122 (as shown in fig. 1, the end close to the printed circuit board 110) are electrically connected together, for example, the first ends of the main helical arms 121 and the first ends of the parasitic helical arms 122 may be electrically connected together via a metal connector, and other electrical connection manners may be adopted.
In the helical antenna 100 of the present embodiment, the radiation main body 120 includes at least one main helical arm 121 and at least one parasitic helical arm 122, and each main helical arm 121 and the corresponding parasitic helical arm 122 are disposed in parallel at an interval, so that the main helical arm 121 can resonate at a higher frequency Band, and the parasitic helical arm 122 can resonate at a lower frequency Band, so that the frequency bandwidth of the helical antenna 100 can be expanded to 6%, and the purpose of covering the dual-frequency GPS \ BDS \ GLONASS satellite navigation frequency and the L-Band frequency is achieved. In addition, the lead angle of the portion of the parasitic spiral arm 122 that exceeds the main spiral arm 121 is smaller than the lead angle of the portion of the parasitic spiral arm 122 that does not exceed the main spiral arm 121, so that the size of the helical antenna 100 can be reduced as much as possible while ensuring the necessary performance of the helical antenna 100, and the structure of the helical antenna 100 is more compact.
As shown in fig. 1 and 3, a feeding network 111 is provided on a surface of the printed circuit board 110 facing the radiation body 120, and the surface of the printed circuit board 110 may be a ground surface to constitute a reflection surface of the helical antenna 100. The printed circuit board 110 may be an FR-4 multi-layer plate material, and may have a plate thickness of 0.5mm to 2 mm. The side of the printed circuit board 110 facing away from the radiating body 120 is provided with signal processing circuitry. The input end of the feed network 111 is electrically connected to each feed output end OUT, and the output end of the feed network 111 is electrically connected to the input end of the signal processing circuit. The feeding network 111 is configured to combine signals output by the feeding output terminals OUT to obtain a circularly polarized signal.
Specifically, as shown in fig. 3 and 4, the feeding network 111 may include two phase shifters 111a (the phase shifter 111a may be a 90-degree phase shifter) and one balun 111b (the balun 111b may be a 180-degree balun), wherein an input terminal of one phase shifter 111a is electrically connected to the two feeding output terminals OUT1, OUT2, an input terminal of the other phase shifter 111a is electrically connected to the remaining two feeding output terminals OUT3, OUT4, and output terminals of the two phase shifters 111a are electrically connected to input terminals of the balun 111 b. The output terminal of the balun 111b is electrically connected to the input terminal of the signal processing circuit.
Specifically, as shown in fig. 4, the signal processing circuit includes a duplex filter 130, a low noise amplifier 140, a duplex combiner 160, and a drive amplifier 180. The input terminal of the duplex filter 130 is electrically connected to the output terminal of the balun 111b, and the output terminal of the duplex filter 130 is electrically connected to the input terminal of the low noise amplifier 140. The input end of the duplex combiner 160 is electrically connected to the output end of the low noise amplifier 140, the output end of the duplex combiner 160 is electrically connected to the input end of the driving amplifier 180, and the output end of the driving amplifier 180 is used for electrically connecting to the satellite positioning receiver 200.
Specifically, in order to electrically connect the feeding network 111 and the signal processing circuit on the printed circuit board 110, a via hole (not shown) may be disposed on the printed circuit board 110 through the thickness direction thereof, so that the input terminal of the duplex filter 130 may be electrically connected to the output terminal of the feeding network 111 through the via hole.
The following describes a specific signal transmission process of the helical antenna 100, and the helical antenna 100 includes 4 main helical arms 121 and 4 parasitic helical arms 122 as an example for explanation:
specifically, as shown in fig. 1, 3 and 4, 4 main spiral arms 121 and 4 parasitic spiral arms 122 form 4 feed output terminals OUT1, OUT2, OUT3 and OUT4, the 4 feed output terminals OUT1, OUT2, OUT3 and OUT4 couple signals to the feed network 111 on the printed circuit board 110 by welding with the printed circuit board 110, the feed network 111 synthesizes orthogonal signals into circularly polarized signals, the circularly polarized signals pass through vias on the printed circuit board 110 and then are sent to the signal processing circuit on the bottom layer, signals in high and low frequency bands are filtered OUT by the duplex filter 130, satellite navigation signals in two received frequency bands are amplified by the low noise amplifier 140, then are subjected to secondary filtering by the filter 150, are synthesized by the duplex combiner 160, then are amplified by the driving amplifier 180, and finally are sent to the satellite positioning receiver 200 through a cable.
Alternatively, as shown in fig. 2, the lead angle α of the main spiral arm 121 may be in the range of 20 ° to 25 °, and accordingly, the lead angle α of the portion of the parasitic spiral arm 122 that does not exceed the main spiral arm 121 may be in the range of 20 ° to 25 °, and the lead angle β of the portion of the parasitic spiral arm 122 that exceeds the main spiral arm 121 may be in the range of 6 ° to 10 °.
Alternatively, as shown in fig. 1 and 2, the helical antenna 100 further includes a flexible printed circuit board 170, the flexible printed circuit board 170 is rolled into a cylindrical shape, a conical shape, or a square column shape, and the radiation body 120 is wound around an outer circumferential surface of the flexible printed circuit board 170.
Alternatively, the main spiral arm 121 of the radiating body 120 is wound around the outer circumferential surface of the flexible printed circuit board 170 by 1 turn, and the parasitic spiral arm 122 of the radiating body 120 is wound around the outer circumferential surface of the flexible printed circuit board 170 by 1.3 turns.
Specifically, the radiation body 120 may be formed on the outer circumferential surface of the flexible printed circuit board 170 using a copper plating or low-temperature baking silver process.
In addition, the radiation body 120 may be formed by winding a microstrip line of 0.707 wavelength on the outer circumferential surface of the flexible printed circuit board 170.
Specifically, the flexible printed circuit board 170 may be a teflon sheet, and microstrip lines may be arranged on the flexible printed circuit board 170 according to a specific helix angle and a specific length, and then the microstrip lines are wound into a spiral line, so as to form the radiation body 120.
Alternatively, as shown in fig. 1 and 2, each parasitic spiral arm 122 may make 0.2 to 0.4 turns, preferably 0.3 turns, beyond the corresponding main spiral arm 121.
The helical antenna 100 of the present invention, as shown in fig. 5 and fig. 6, has a maximum gain of more than 3dBi at the dual-Band GPS \ BDS \ GLONASS satellite navigation frequency and L-Band, and the antenna has a gain of-1.2 dBi at a low elevation angle of 20 degrees. As shown in fig. 7, the reflection at the feed output is greater than 9dB, satisfying the helical antenna requirements. As shown in FIG. 8, the axial polarization axis ratio of the helical antenna is 0.07dB, and the low elevation angle is less than 2dB, which reaches the state of the art. Furthermore, the utility model discloses a helical antenna 100 can also effectively reduce helical antenna 100's size for helical antenna 100's compact structure.
The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be appreciated by a person skilled in the art that the scope of the invention as claimed in the present application is not limited to the embodiments with specific combinations of the above-mentioned features, but also covers other embodiments with any combination of the above-mentioned features or their equivalents without departing from the inventive concept. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.

Claims (12)

1. A helical antenna, comprising a printed circuit board and a radiating body disposed above the printed circuit board, wherein the radiating body comprises at least one main helical arm and at least one parasitic helical arm, each main helical arm corresponds to at least one parasitic helical arm, and each main helical arm is disposed in parallel with the corresponding parasitic helical arm at an interval; wherein,
the first end of each main spiral arm is electrically connected with the first end of the corresponding parasitic spiral arm to form a feed output end of the spiral antenna;
the second end of the main spiral arm and the second end of the parasitic spiral arm are in floating connection;
the length of the parasitic spiral arm is greater than that of the corresponding main spiral arm, and the helix angle of the part of the parasitic spiral arm exceeding the main spiral arm is smaller than that of the part of the parasitic spiral arm not exceeding the main spiral arm.
2. The helical antenna of claim 1, wherein a feed network is disposed on a side of said printed circuit board facing said radiating body, and a signal processing circuit is disposed on a side of said printed circuit board facing away from said radiating body; wherein,
the input end of the feed network is electrically connected with the feed output ends, and the output end of the feed network is electrically connected with the input end of the signal processing circuit;
the feed network is used for synthesizing the signals output by the feed output ends to obtain circularly polarized signals;
the signal processing circuit is used for carrying out preset processing on the circularly polarized signal so as to obtain a target signal meeting the requirement.
3. The helical antenna of claim 2, wherein said feed network comprises a phase shifter and a balun, an input of said phase shifter being electrically connected to each of said feed outputs, an output of said phase shifter being electrically connected to an input of said balun, an output of said balun being electrically connected to an input of said signal processing circuitry.
4. The helical antenna of claim 2, wherein said signal processing circuitry comprises a duplex filter, a low noise amplifier, a duplex combiner, and a driver amplifier, wherein,
the input end of the duplex filter is electrically connected with the output end of the feed network, and the output end of the duplex filter is electrically connected with the input end of the low-noise amplifier;
the input end of the duplex combiner is electrically connected with the output end of the low-noise amplifier, and the output end of the duplex combiner is electrically connected with the input end of the driving amplifier;
and the output end of the driving amplifier is used for being electrically connected with a satellite positioning receiver.
5. The helical antenna of claim 4, wherein said printed circuit board has a via hole formed therethrough in a thickness direction thereof, and wherein said duplex filter has an input terminal electrically connected to said feed network output terminal via said via hole.
6. The helical antenna of any one of claims 1 to 5, wherein a lead angle of said main helical arm is in a range of 20 ° to 25 °.
7. The helical antenna of any one of claims 1 to 5, further comprising a flexible printed circuit board, wherein the flexible printed circuit board is rolled into a cylindrical shape, a conical shape or a square cylindrical shape, and the radiation body is wound around an outer circumferential surface of the flexible printed circuit board.
8. The helical antenna as claimed in claim 7, wherein said radiation body is formed on an outer circumferential surface of said flexible printed circuit board using a copper plating or a low temperature baking silver process.
9. A helical antenna according to any one of claims 1 to 5, wherein said radiating body is a 0.707 wavelength microstrip line.
10. The helical antenna of any one of claims 1 to 5, wherein said printed circuit board has a thickness in the range of 0.5mm to 2 mm.
11. The helical antenna of any one of claims 1 to 5, wherein said radiating body comprises 4 said main helical arms and 4 said parasitic helical arms.
12. The helical antenna of any one of claims 1 to 5, wherein each said parasitic helical arm extends 0.2-0.4 turns beyond its corresponding said main helical arm.
CN201821606823.9U 2018-09-29 2018-09-29 Helical antenna Active CN209001136U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201821606823.9U CN209001136U (en) 2018-09-29 2018-09-29 Helical antenna

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201821606823.9U CN209001136U (en) 2018-09-29 2018-09-29 Helical antenna

Publications (1)

Publication Number Publication Date
CN209001136U true CN209001136U (en) 2019-06-18

Family

ID=66803008

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201821606823.9U Active CN209001136U (en) 2018-09-29 2018-09-29 Helical antenna

Country Status (1)

Country Link
CN (1) CN209001136U (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110518370A (en) * 2019-08-06 2019-11-29 西安电子科技大学 A kind of wide angle covering array antenna of multiband Shared aperture
CN110970727A (en) * 2018-09-29 2020-04-07 北京合众思壮科技股份有限公司 Helical antenna

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110970727A (en) * 2018-09-29 2020-04-07 北京合众思壮科技股份有限公司 Helical antenna
CN110518370A (en) * 2019-08-06 2019-11-29 西安电子科技大学 A kind of wide angle covering array antenna of multiband Shared aperture

Similar Documents

Publication Publication Date Title
US10199733B1 (en) Multiband multifilar antenna
US6653987B1 (en) Dual-band quadrifilar helix antenna
CN110970727A (en) Helical antenna
US6720935B2 (en) Single and dual-band patch/helix antenna arrays
US20200083608A1 (en) Circularly polarized antennas
US5450093A (en) Center-fed multifilar helix antenna
US9246224B2 (en) Broadband antenna system allowing multiple stacked collinear devices and having an integrated, co-planar balun
US7245268B2 (en) Quadrifilar helical antenna
US7339542B2 (en) Ultra-broadband antenna system combining an asymmetrical dipole and a biconical dipole to form a monopole
US8228257B2 (en) Broadband antenna system allowing multiple stacked collinear devices
US6181295B1 (en) Helix antenna with a built-in broadband power supply, and manufacturing methods therefor
CA2640247A1 (en) Multi-band inverted-l antenna
CN110247169B (en) Double-frequency quadrifilar helix antenna with wide wave beam characteristic
CN209001136U (en) Helical antenna
JP2012520594A (en) Dielectric loaded antenna
US10511099B2 (en) Dual-band shaped-pattern quadrifilar helix antenna
US6608604B1 (en) Helical antenna with built-in duplexing means, and manufacturing methods therefor
US10965012B2 (en) Multi-filar helical antenna
CN108155460B (en) Double-frequency omni-directional coupling support-section loaded spiral antenna and manufacturing method thereof
WO2008088099A1 (en) Balun internal type loop antenna
US5621420A (en) Duplex monopole antenna
US20050012676A1 (en) N-port signal divider/combiner
US6535179B1 (en) Drooping helix antenna
US20040017327A1 (en) Dual polarized integrated antenna
CN216413259U (en) Wide-band helical antenna

Legal Events

Date Code Title Description
GR01 Patent grant
GR01 Patent grant