CN112821074B - Active short wave broadband double whip antenna - Google Patents
Active short wave broadband double whip antenna Download PDFInfo
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- CN112821074B CN112821074B CN202110004631.0A CN202110004631A CN112821074B CN 112821074 B CN112821074 B CN 112821074B CN 202110004631 A CN202110004631 A CN 202110004631A CN 112821074 B CN112821074 B CN 112821074B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
- H01Q3/24—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the orientation by switching energy from one active radiating element to another, e.g. for beam switching
- H01Q3/247—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the orientation by switching energy from one active radiating element to another, e.g. for beam switching by switching different parts of a primary active element
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention discloses an active short wave broadband dual whip antenna, which comprises a first antenna radiation unit, a second antenna radiation unit, a loading network, a matching network and an integrated network circuit, wherein the loading network is connected with the first antenna radiation unit; one or more loading networks are arranged on the first antenna radiation unit and the second antenna radiation unit; the bottom ends of the first antenna radiation unit and the second antenna radiation unit are provided with matching networks, the matching networks comprise a plurality of sub-matching networks, and different sub-matching networks correspond to different beam directions; the integrated network circuit controls the feed phase of the first antenna radiation unit and the second antenna radiation unit in a heterogeneous feed mode; the beam direction of the radio frequency signals is obtained, and a sub-matching network corresponding to the beam direction is selected to perform impedance matching on the first antenna radiation unit and the second antenna radiation unit; the invention satisfies impedance matching when the wave beam points to different directions, and realizes the broadband of the antenna; and the feeding phase of the antenna radiating unit is controlled by adopting an out-of-phase feeding mode, so that the horizontal beam scanning of the antenna array in the working frequency band is realized, and the directional gain of the double whip antenna is improved.
Description
Technical Field
The invention belongs to the technical field of radio short wave antennas, and particularly relates to an active short wave broadband dual whip antenna.
Background
At present, a traditional in-phase feeding mode is adopted by a short-wave double whip antenna, and the in-phase feeding mode maintains the omnidirectionality of a horizontal plane directional diagram, but the directivity gain of the antenna is low, and the standing wave ratio of a low frequency band is large, so that the radiation efficiency of the antenna is low.
Because the bandwidth of the short-wave frequency band is wider and is up to 10 times Cheng Pin, in order to realize broadband, the existing short-wave double whip antenna adopts two pairs of double whip antennas to respectively cover a high frequency band and a low frequency band by dividing the high frequency band into high and low ports; in order to reduce mutual interference, the occupied area of the two pairs of dual whip antennas is often larger, and the traditional short-wave dual whip antennas are difficult to realize for mobile platforms such as carrier-borne mobile platforms and vehicle-mounted mobile platforms with narrow space.
Disclosure of Invention
Aiming at least one defect or improvement requirement of the prior art, the invention provides an active short wave broadband dual whip antenna, which aims to solve the problems of low antenna directivity gain, large low-frequency standing wave ratio and low antenna radiation efficiency of the existing short wave dual whip antenna.
To achieve the above object, according to one aspect of the present invention, there is provided an active short wave broadband dual whip antenna, the antenna comprising a first antenna radiating element and a second antenna radiating element arranged in parallel, and a loading network, a matching network and an integrated network circuit;
one or more loading networks are respectively arranged on the bodies of the first antenna radiation unit and the second antenna radiation unit and used for primary impedance matching;
the bottom ends of the first antenna radiation unit and the second antenna radiation unit are respectively provided with a matching network, wherein the matching networks comprise a plurality of sub-matching networks, and the different sub-matching networks correspond to different beam directions in the directional diagrams;
the integrated network circuit controls the feed phases of the first antenna radiation unit and the second antenna radiation unit in an out-of-phase feed mode; and acquiring the beam direction of the radio frequency signal, and selecting a sub-matching network corresponding to the beam direction to perform impedance matching on the first antenna radiating unit and the second antenna radiating unit.
Preferably, the active short wave broadband dual whip antenna, the integrated network circuit comprises:
the detection network is used for acquiring the beam direction of the radio frequency signal, determining a sub-matching network corresponding to the beam direction and generating a channel selection instruction; determining the phase shift angles of the first antenna radiation unit and the second antenna radiation unit according to the beam direction;
the feed network is used for controlling the feed phases of the first antenna radiation unit and the second antenna radiation unit in an out-of-phase feed mode under the control of the detection network;
and the switch matrix is respectively connected with each sub-matching network, and the corresponding sub-matching network is selected according to the channel selection instruction to perform impedance matching on the first antenna radiation unit and the second antenna radiation unit.
Preferably, the active short wave broadband dual whip antenna, the detection network comprises:
the radio frequency front end is used for acquiring the beam direction of the radio frequency signal;
and the microprocessor is used for forming a channel selection instruction according to the beam direction and determining the phase shift angles of the first antenna radiation unit and the second antenna radiation unit.
Preferably, the active short wave broadband dual whip antenna, the feed network comprises a power division network and a phase shift network;
the power division network is used for dividing the radio frequency signals to be transmitted into two identical paths;
the phase shifting network is used for respectively shifting the phase of the two paths of radio frequency signals under the control of the detection network, and respectively providing the two paths of radio frequency signals after the phase shifting to the first antenna radiating unit and the second antenna radiating unit through the sub-matching network selected by the switch matrix, so that the horizontal beam scanning of the antenna array in the working frequency band is realized.
Preferably, the active shortwave broadband dual whip antenna is characterized in that the phase shifting network is implemented by a phase shifting cable or a phase shifter.
Preferably, the active short-wave broadband dual whip antenna is characterized in that the power division network is connected with a short-wave radio station through a coaxial cable, and receives a radio frequency signal to be transmitted provided by the short-wave radio station.
Preferably, the active short wave broadband dual whip antenna comprises a switch matrix, wherein the switch matrix comprises a plurality of radio frequency switches, and each radio frequency switch is connected with a sub-matching network respectively.
Preferably, the active short wave broadband dual whip antenna, the loading network comprises a plurality of impedance elements connected in series or parallel.
Preferably, each sub-matching network comprises a transmission line transformer and an LC resonant network which are arranged in parallel;
the transmission line transformer is connected with the first antenna radiating unit and the second antenna radiating unit, and the LC resonance network is connected with the integrated network circuit.
Preferably, the active short wave broadband dual whip antenna, the first antenna radiating unit and the second antenna radiating unit are respectively installed on the antenna bases, and the integrated network circuit is arranged between the two antenna bases.
In general, the above technical solutions conceived by the present invention, compared with the prior art, enable the following beneficial effects to be obtained:
(1) The active short wave broadband dual whip antenna provided by the invention has the advantages that the first antenna radiation unit and the second antenna radiation unit are respectively provided with a plurality of sub-matching networks, and the different sub-matching networks correspond to different beam directions in the directional diagram; the integrated network circuit selects a corresponding sub-matching network according to the beam direction of the radio frequency signals to be transmitted/received to perform impedance matching on the first antenna radiating unit and the second antenna radiating unit, and the impedance matching when the beams point to different directions is met, so that the broadband of the antenna is realized, and the standing wave ratio of the port is not more than 3.
(2) The active short wave broadband dual whip antenna provided by the invention has the advantages that the integrated network circuit controls the feed phases of the first antenna radiation unit and the second antenna radiation unit in an out-of-phase feed mode, so that the horizontal beam scanning of the antenna array in the working frequency band is realized; the radio frequency signals emitted by the first antenna radiating unit and the second antenna radiating unit are synthesized through space power to form directional beams, so that the directional gain of the dual whip antenna is improved, and the directional gain is not less than 4dBi.
(3) The active short wave broadband dual whip antenna provided by the invention has the advantages of miniaturization, wide frequency band, high gain and high power, the total height of the antenna is 10m, the distance between the two antennas is 3m, the occupied area of the whole antenna is less than or equal to 3m multiplied by 0.1m, and the antenna is suitable for communication of mobile platforms such as carrier-borne and vehicle-mounted mobile platforms with relatively small space.
Drawings
Fig. 1 is a schematic hardware structure diagram of an active shortwave broadband dual whip antenna according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a composition structure of an active shortwave broadband dual whip antenna according to an embodiment of the present invention;
fig. 3 is a schematic diagram of the composition of a sub-matching network according to an embodiment of the present invention;
like reference numerals denote like technical features throughout the drawings, in particular: 1-a first antenna radiation unit; 2-a second antenna radiating element; 3-loading a network; 4-a matching network; a 5-integrated network circuit; 6-coaxial cable; 7-antenna base.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention. In addition, the technical features of the embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
The following description is merely exemplary in nature and is not intended to limit the present invention, its application, or uses. Further, the drawings are schematic, and the ratio of the dimensions and the like are not necessarily the same as in the actual case.
Fig. 1 is a schematic hardware structure of an active short wave broadband dual whip antenna provided in this embodiment, referring to fig. 1, the active short wave broadband dual whip antenna includes a first antenna radiating unit 1 and a second antenna radiating unit 2 arranged in parallel, and a loading network 3, a matching network 4 and an integrated network circuit 5;
wherein, the bodies of the first antenna radiation unit 1 and the second antenna radiation unit 2 are respectively provided with one or a plurality of loading networks 3, and the loading networks 3 are used for performing primary impedance matching;
the bottom ends of the first antenna radiation unit 1 and the second antenna radiation unit 2 are respectively provided with a matching network 4, the matching network 4 comprises a plurality of sub-matching networks, and the different sub-matching networks correspond to different beam directions in the directional diagrams;
the integrated network circuit 5 controls the feed phases of the first antenna radiation unit 1 and the second antenna radiation unit 2 in an out-of-phase feed mode; and the integrated network circuit 5 acquires the beam direction of the radio frequency signal, and selects a sub-matching network corresponding to the beam direction to perform impedance matching on the first antenna radiating unit 1 and the second antenna radiating unit 2.
In this embodiment, the first antenna radiation unit and the second antenna radiation unit are configured with a plurality of sub-matching networks, and different sub-matching networks correspond to different beam directions in the directional diagram; the integrated network circuit selects a corresponding sub-matching network according to the beam direction of the radio frequency signals to be transmitted/received to perform impedance matching on the first antenna radiating unit and the second antenna radiating unit, and the impedance matching when the beams point to different directions is met, so that the broadband of the antenna is realized, and the standing wave ratio of the port is not more than 3. In addition, the integrated network circuit adopts an out-of-phase feed mode to control feed phases of the first antenna radiation unit and the second antenna radiation unit, so that horizontal beam scanning of the antenna array in the working frequency band is realized; the radio frequency signals emitted by the first antenna radiating unit and the second antenna radiating unit are synthesized through space power to form directional beams, so that the directional gain of the dual whip antenna is improved, and the directional gain is not less than 4dBi.
The number and specific installation of the loading networks 2 are not particularly limited, and generally, the number of the loading networks 2 is determined by the parameters such as the impedance and standing wave ratio of the antenna, and the number of the loading networks 2 is preferably not more than two, and the number of the loading networks 2 is too much, so that the impedance loss of the antenna can be increased.
Fig. 2 is a schematic structural diagram of an active shortwave broadband dual whip antenna provided in this embodiment, referring to fig. 2, in an alternative embodiment, the integrated network circuit includes:
the detection network is used for acquiring the beam direction of the radio frequency signal, determining a sub-matching network corresponding to the beam direction and generating a channel selection instruction; determining the phase shift angles of the first antenna radiation unit and the second antenna radiation unit according to the beam direction;
the feed network is used for controlling the feed phases of the first antenna radiation unit and the second antenna radiation unit in an out-of-phase feed mode under the control of the detection network;
and the switch matrix is respectively connected with each sub-matching network, and selects the corresponding sub-matching network to perform impedance matching on the first antenna radiation unit and the second antenna radiation unit according to the channel selection instruction.
As a specific example, the switch matrix includes a plurality of radio frequency switches, each radio frequency switch being connected to a respective one of the sub-matching networks.
In one specific example, each sub-matching network has a unique channel number that corresponds to one radio frequency switch in the switch matrix; the mapping relation between each beam direction/beam direction interval and the channel number of the corresponding sub-matching network is stored in the detection network; after the beam direction is determined, the channel number of the sub-matching network corresponding to the beam direction in the switch matrix can be determined, so that the switch matrix is controlled to select the corresponding sub-matching network.
In this embodiment, a detection network is added to an integrated network circuit at the bottom of the antenna, and frequency discrimination and incoming wave direction detection are implemented through the detection network, and the detection result is used to control the feed network and the switch matrix.
And a feed network is arranged in an integrated network circuit at the bottom end of the antenna, and the feed phases of the two antenna radiating units are controlled in an out-of-phase feed mode, so that horizontal beam scanning of the antenna array in an operating frequency band is realized.
The switch matrix is arranged in the integrated network circuit at the bottom end of the antenna, so that the radio frequency channel can be effectively controlled and switched, and the corresponding sub-matching network is connected to complete sectional impedance matching, thereby realizing the broadband of the antenna.
With continued reference to fig. 2, in an alternative embodiment, the detection network includes:
the radio frequency front end is used for acquiring the beam direction of the radio frequency signal;
the microprocessor samples the beam direction from the front end of the radio frequency, forms a channel selection instruction according to the beam direction and sends the channel selection instruction to the switch matrix; and determining the respective phase shift angles of the first antenna radiation unit and the second antenna radiation unit, and sending the phase shift angles to a feed network.
In this embodiment, frequency discrimination and incoming wave direction detection can be implemented through the radio frequency front end, and the detection result is sent to the microprocessor for controlling the switch matrix.
In an alternative embodiment, the feed network comprises:
the power division network is used for dividing the radio frequency signals to be transmitted into two identical paths; the power division network is connected with the short-wave radio station through a coaxial cable and receives radio frequency signals to be transmitted, which are provided by the short-wave radio station.
The phase shifting network is used for respectively shifting the phase of the two paths of radio frequency signals under the control of the detection network, and respectively providing the two paths of radio frequency signals after the phase shifting to the first antenna radiating unit and the second antenna radiating unit through the sub-matching network selected by the switch matrix to realize horizontal beam scanning of the antenna array in the working frequency band.
In this embodiment, the power division network performs distribution/synthesis of signal energy, and the phase shift network may be implemented by a phase shift cable (delay line) or a phase shifter.
In this embodiment, a loading network 3 is disposed at the upper end of the antenna, where the loading network 3 is formed by impedance elements in a serial/parallel manner, so as to implement primary impedance matching of the antenna.
In addition, a broadband matching technology is adopted, a matching network is arranged at the bottom end of the antenna, and further impedance matching of the antenna is realized; the matching network comprises a plurality of sub-matching networks, referring to fig. 3, each sub-matching network comprises a transmission line transformer and an LC resonant network which are arranged in parallel; the transmission line transformer is connected with the first antenna radiating unit and the second antenna radiating unit, and the LC resonance network is connected with the integrated network circuit.
In an alternative embodiment, the first antenna radiating element 1, the second antenna radiating element 2 are each mounted on an antenna mount 7, and the integrated network circuit 5 is arranged between the two antenna mounts 7.
In a specific example, the active short wave broadband dual whip antenna provided in this embodiment is composed of two whip antennas, and the two whip antennas are respectively fixed on the antenna base 7; the loading network 3 is arranged on the antenna body, the matching network 4 is arranged at the bottom end of the antenna, and the integrated network circuit 5 is positioned between two antenna seats 7 at the bottom end of the antenna; the integrated network circuit 5 is connected to a short-wave radio station through a coaxial cable 6, and the working frequency range of the short-wave radio station is 3-30 MHz, so that the scanning range of a horizontal plane beam can be 360 degrees. The whip antenna is 10m high, the distance between the whip antennas is 3m, the occupied area of the whole antenna is less than or equal to 3m multiplied by 0.1m, the miniaturization of the antenna is realized, the occupied area is small, and the whip antenna is suitable for communication on mobile platforms such as carrier-borne and vehicle-mounted mobile platforms with relatively small space.
The active short wave broadband dual whip antenna provided by the embodiment achieves the following technical indexes:
(1) Operating frequency: 3-30 MHz
(2) Antenna form: two whip antennas
(3) Polarization mode: vertical polarization
(4) Active standing wave ratio: not more than 3
(5) Input impedance: 50 omega
(6) Antenna gain: not less than 4dBi
(7) Horizontal scan range: 360 degree
(8) Antenna footprint: less than or equal to 3m multiplied by 0.1m
It will be readily appreciated by those skilled in the art that the foregoing description is merely a preferred embodiment of the invention and is not intended to limit the invention, but any modifications, equivalents, improvements or alternatives falling within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (9)
1. The active short wave broadband dual whip antenna is characterized by comprising a first antenna radiating unit, a second antenna radiating unit, a loading network, a matching network and an integrated network circuit, wherein the first antenna radiating unit and the second antenna radiating unit are arranged in parallel at a certain distance;
one or more loading networks are respectively arranged on the bodies of the first antenna radiation unit and the second antenna radiation unit and used for primary impedance matching;
the bottom ends of the first antenna radiation unit and the second antenna radiation unit are respectively provided with a matching network, wherein the matching networks comprise a plurality of sub-matching networks, and the different sub-matching networks correspond to different beam directions in the directional diagrams;
the integrated network circuit controls the feed phases of the first antenna radiation unit and the second antenna radiation unit in an out-of-phase feed mode; the method comprises the steps of acquiring the beam direction of a radio frequency signal, and selecting a sub-matching network corresponding to the beam direction to perform impedance matching on a first antenna radiation unit and a second antenna radiation unit; the integrated network circuit includes:
the detection network is used for acquiring the beam direction of the radio frequency signal, determining a sub-matching network corresponding to the beam direction and generating a channel selection instruction; determining the phase shift angles of the first antenna radiation unit and the second antenna radiation unit according to the beam direction;
the feed network is used for controlling the feed phases of the first antenna radiation unit and the second antenna radiation unit in an out-of-phase feed mode under the control of the detection network;
and the switch matrix is respectively connected with each sub-matching network, and the corresponding sub-matching network is selected according to the channel selection instruction to perform impedance matching on the first antenna radiation unit and the second antenna radiation unit.
2. The active shortwave broadband dual whip antenna of claim 1, wherein the detection network comprises:
the radio frequency front end is used for acquiring the beam direction of the radio frequency signal;
and the microprocessor is used for forming a channel selection instruction according to the beam direction and determining the phase shift angles of the first antenna radiation unit and the second antenna radiation unit.
3. The active shortwave broadband dual whip antenna of claim 1, wherein the feed network comprises a power division network and a phase shift network;
the power division network is used for dividing the radio frequency signals to be transmitted into two identical paths;
the phase shifting network is used for respectively shifting the phase of the two paths of radio frequency signals under the control of the detection network, and respectively providing the two paths of radio frequency signals after the phase shifting to the first antenna radiating unit and the second antenna radiating unit through the sub-matching network selected by the switch matrix, so that the horizontal beam scanning of the antenna array in the working frequency band is realized.
4. The active shortwave broadband dual whip antenna of claim 3, wherein the phase shifting network is implemented with a phase shifting cable or a phase shifter.
5. The active shortwave broadband dual whip antenna of claim 3, wherein the power division network is connected to a shortwave radio station via a coaxial cable, and receives a radio frequency signal to be transmitted provided by the shortwave radio station.
6. The active shortwave broadband dual whip antenna of claim 1, wherein the switch matrix comprises a plurality of radio frequency switches, each of the radio frequency switches being connected to a respective sub-matching network.
7. The active shortwave broadband dual whip antenna of claim 1, wherein the loading network comprises a plurality of impedance elements connected in series or parallel.
8. The active shortwave broadband dual whip antenna of claim 1, wherein each of the sub-matching networks comprises a transmission line transformer and LC resonant network arranged in parallel;
the transmission line transformer is connected with the first antenna radiating unit and the second antenna radiating unit, and the LC resonance network is connected with the integrated network circuit.
9. The active shortwave broadband dual whip antenna of claim 1, wherein the first antenna radiating element and the second antenna radiating element are each mounted on an antenna mount.
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| CN202110004631.0A CN112821074B (en) | 2021-01-04 | 2021-01-04 | Active short wave broadband double whip antenna |
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| CN115832688B (en) * | 2023-02-13 | 2023-05-09 | 理工全盛(北京)科技有限公司 | Decoy antenna, driving method thereof and anti-unmanned aerial vehicle navigation decoy device |
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| CN102013559A (en) * | 2010-09-20 | 2011-04-13 | 西安电子科技大学 | Beam scanning array antenna |
| CN102522633A (en) * | 2012-01-17 | 2012-06-27 | 桂林电子科技大学 | Ultra wide band miniature fractal antenna |
| CN210956997U (en) * | 2019-12-31 | 2020-07-07 | 马新红 | Whip-shaped short wave phased array communication antenna system |
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