CN102324623B - Dual-band biorthogonal phase output power division feed network - Google Patents
Dual-band biorthogonal phase output power division feed network Download PDFInfo
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- CN102324623B CN102324623B CN201110255131.0A CN201110255131A CN102324623B CN 102324623 B CN102324623 B CN 102324623B CN 201110255131 A CN201110255131 A CN 201110255131A CN 102324623 B CN102324623 B CN 102324623B
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Abstract
The invention discloses a dual-band biorthogonal phase output power division feed network comprising a dual-band Wilkinson power splitter based on a left-handed and right-handed composite transmission wire, a dual-band 90-degree phase shifter based on the left-handed and right-handed composite transmission wire, a medium substrate and a floor metal layer. The feed network provides equal power at two output ports, and has a biorthogonal property of providing phase advance 90 degrees at the 1.618GHz uplink frequency of Beidou satellite navigation system and phase lag 90 degrees at 2.494GHz downlink frequency of the Beidou satellite navigation system. The dual-band biorthogonal phase output power division feed network has the characteristics of simple structure, easiness in processing, easiness in integration, smaller size and the like. The dual-band biorthogonal phase output power division feed network can meet the performance requirements of the power division feed network at the uplink frequency and the downlink frequency of the Beidou satellite navigation system, and has the dual-band biorthogonal property of providing phase advance 90 degrees at the uplink frequency and phase lag 90 degrees at the downlink frequency.
Description
Technical field
The present invention relates to a kind of double-frequency biorthogonal phase output power division feeding network, can be used as the feeding network of the dual-band dual-circular polarization antenna in Beidou satellite navigation system terminal equipment.
Background technology
Satellite navigation industry is national strategy high-tech industry, be typical technology-intensive type and service type IT industry, its development prospect is very wide, is after cellular mobile communication and the Internet, the information industry that global evolution is the fastest, has become another new growth point of the 3rd IT economy.Satellite take american global positioning system GPS as representative and positioning GPS application industry progressively become a global new high-tech industry.The satellite navigation industry of China is just entering the crucial moment of industrialization high speed development, estimates will to form the market of a great scale in five to ten years from now on.
Along with the development of Beidou satellite navigation system, for the demand of Beidou satellite navigation system by increasing.Beidou satellite navigation system can provide satellite fix service and data, services simultaneously, and this is and an important difference of other satellite navigation systems.The client of Beidou satellite navigation system also can send data message by system by system receiving satellite positioning signals, and this requires the antenna of client to have different circular polarization directions to reduce interference on reception and two frequencies of transmission.This kind equipment adopts two slave antennas be operated in respectively transmitting frequency and receive frequency conventionally, and adopts different feeding networks respectively to reception antenna and transmitting antenna feed.
But at present design can be simultaneously provides the feeding network of different quadrature phase to have following technological difficulties receiving and send two frequency ranges:
1, the double frequency biorthogonal technology of SF single feed network
Under normal circumstances, the double-fed point circular polarized antenna that is simultaneously operated in satellite communication system uplink and downlink frequency need to use two feeding networks and two feed port to be respectively to be operated in the antenna of upstream frequency and downstream frequency to carry out feed.This mode requires to adopt two feeding networks, if use single feeding network and single feed port to carry out feed to two double-fed point circular polarized antennas that are operated in upstream frequency and downstream frequency, need to guarantee that the phase place of two output ports of this feeding network on upstream frequency and downstream frequency meets orthogonality relation.This orthogonality relation also need to meet respectively leading 90 degree and the phase place quadrature laggings of phase place on the upstream frequency of Beidou satellite navigation system and downstream frequency, and guarantee receives and the circular polarization rotation direction of transmitting antenna is that left-hand circular polarization is right-handed circular polarization at the downstream frequency of Beidou satellite navigation system in the upstream frequency of Beidou satellite navigation system.In order to reach such object, phase difference while supposing to be operated in Beidou satellite navigation system upstream frequency between two output ports of feeding network is leading 90 degree, and when Beidou satellite navigation system downstream frequency, between two output ports of feeding network, phase difference is quadrature lagging.Because traditional transmission line is weak dispersion transmission line, the pass between its phase characteristic and frequency ties up to and in larger frequency range, is substantially linear characteristic.The low frequency of double frequency biorthogonal network and the relation of high-frequency work Frequency point that adopt conventional transmission line to realize are generally
, and between the upstream frequency of Beidou satellite navigation system and downstream frequency, do not meet this relation.So can not serve as the feeding network of Beidou satellite navigation system with the double frequency biorthogonal network that this transmission line is realized.
2, miniaturization technology
Miniaturization technology is a great problem in the design of double frequency biorthogonal feeding network, and this is that they have occupied a large amount of circuit spaces because the double frequency biorthogonal feeding network that conventional method realizes needs two input ports and two feeding networks.Adopt common technology and normal transmission line to be difficult to realize the double frequency biorthogonal feeding network of single port list network.Conventionally will design two different feeding networks and be respectively the antenna feed that two subtask frequencies are contrary with polarised direction, this feeding classification volume is larger.The orthogonal feed network and the antenna that are operated in different frequency make terminal equipment comparatively complicated, and take larger space.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, a kind of double-frequency biorthogonal phase output power division feeding network is provided, and the feeding network of the dual-band and dual-feed point circular polarized antenna that described double-frequency biorthogonal phase output power division feeding network be can be used as be operated in Beidou satellite navigation system is also realized single port feed.
The present invention utilizes left-right-hand composite transmission line to realize the double frequency Wilkinson power splitter based on left-right-hand composite transmission line, and the double frequency 90 that adopts microstrip transmission line and left-right-hand composite transmission line to realize based on left-right-hand composite transmission line spends phase-shifter, and between the second port of described double-frequency biorthogonal phase output power division feeding network and the 3rd port take realized on described two ports phase relation meet Beidou satellite navigation system upstream frequency as leading 90 degree and at downstream frequency the double frequency biorthogonal phase characteristic as quadrature lagging.In addition,, owing to having adopted the left-right-hand composite transmission line with nonlinear phase characteristic, the present invention also has miniaturization, is convenient to the feature of processing.
Object of the present invention is achieved through the following technical solutions:
A kind of double-frequency biorthogonal phase output power division feeding network, comprises that the double frequency Wilkinson power splitter based on left-right-hand composite transmission line, the double frequency 90 based on left-right-hand composite transmission line spend phase-shifter, medium substrate and floor metal level; The described double frequency Wilkinson power splitter based on left-right-hand composite transmission line, the double frequency 90 based on left-right-hand composite transmission line are spent phase-shifter and are attached to a side of medium substrate, and floor metal level is attached to the opposite side of medium substrate.
In above-mentioned double-frequency biorthogonal phase output power division feeding network, described double frequency Wilkinson power splitter comprises the first microstrip transmission line, the second microstrip transmission line, the 3rd microstrip transmission line, the first left-right-hand composite transmission line, the second left-right-hand composite transmission line, the 4th microstrip transmission line, the 5th microstrip transmission line and isolation resistance R; One end of the first microstrip transmission line is as the first port of described double-frequency biorthogonal phase output power division feeding network, and the other end of the first microstrip transmission line connects one end of the second microstrip transmission line and one end of the 3rd microstrip transmission line; The other end of the second microstrip transmission line connects one end of the first left-right-hand composite transmission line, the other end of the first left-right-hand composite transmission line connects one end of the 4th microstrip transmission line, and the other end of the 4th microstrip transmission line is as the second port of described double-frequency biorthogonal phase output power division feeding network; The other end of the 3rd microstrip transmission line connects one end of the second left-right-hand composite transmission line, the other end of the second left-right-hand composite transmission line connects the 5th microstrip transmission line one end, the other end of the 5th microstrip transmission line connects one end of the 3rd left-right-hand composite transmission line, the other end of the 3rd left-right-hand composite transmission line connects the 6th microstrip transmission line, and the other end of the 6th microstrip transmission line is as the 3rd port of described double-frequency biorthogonal phase output power division feeding network; Isolation resistance R is connected across between the 4th and the 5th microstrip transmission line.
In above-mentioned double-frequency biorthogonal phase output power division feeding network, described left-right-hand composite transmission line is by one or more π type cell formations; While adopting described in two above π type cell formations left-right-hand composite transmission line, described two above π type unit connect with series system.
In above-mentioned double-frequency biorthogonal phase output power division feeding network, the first module port of described π type unit one end in interdigital capacitor, the other end of interdigital capacitor is as the second unit port of π type unit; One end of the first short circuit metal wire is connected to first module port edge, the other end of the first short circuit metal wire is the metallic vias that is connected to the medium back side, one end of the second short circuit metal wire is connected to second unit port edge, and the other end of the second short circuit metal wire is the metallic vias that is connected to the medium back side.
In above-mentioned double-frequency biorthogonal phase output power division feeding network, the first output impedance to the 3rd port of described double-frequency biorthogonal phase output power division feeding network is
; The characteristic impedance of the first microstrip transmission line, the 4th microstrip transmission line, the 5th microstrip transmission line, the 6th microstrip transmission line and the 3rd left-right-hand composite transmission line is
; The characteristic impedance of the second microstrip transmission line, the 3rd microstrip transmission line, the first left-right-hand composite transmission line and the second left-right-hand composite transmission line is
.
In above-mentioned double-frequency biorthogonal phase output power division feeding network, the phase relation between described double-frequency biorthogonal phase output power division feeding network the second port and the 3rd port meets the relation that is respectively leading 90 degree and quadrature lagging at the upstream frequency 1.618GHz of Beidou satellite navigation system and two frequencies of downstream frequency 2.492GHz.
In above-mentioned double-frequency biorthogonal phase output power division feeding network, the first port of described double-frequency biorthogonal phase output power division feeding network is all less than 0.3 dB to the range value difference between the transmission coefficient of the second port and the transmission coefficient of the first port to the three ports on 1.618GHz and two frequencies of 2.492GHz.
Compared with prior art, tool of the present invention has the following advantages and technique effect:
(1) phase relation between double-frequency biorthogonal phase output power division feeding network the second port of the present invention and the 3rd port meets the relation that is respectively leading 90 degree and quadrature lagging at the upstream frequency 1.618GHz of Beidou satellite navigation system and two frequencies of downstream frequency 2.492GHz.
(2) described double-frequency biorthogonal phase output power division feeding network has been realized good power division and amplitude balance, is all less than 0.3 dB at 1.618GHz and the above double-frequency biorthogonal phase output power division feeding network first port of two frequencies of 2.492GHz to the range value difference between the transmission coefficient between the transmission coefficient between the second port and the first port to the three ports on 1.618GHz and two frequencies of 2.492GHz.
(3) described double-frequency biorthogonal phase output power division feeding network has been realized less frequency ratio, is in 1.618 GHz and two frequencies of 2.492 GHz, to realize the mean allocation of power in frequency, and its operating frequency is than being 2.492/1.618.
(4) phase difference between described double-frequency biorthogonal phase output power division feeding network the second port and the 3rd port has been realized respectively different orthogonal properties on the upstream frequency of Beidou satellite navigation system and downstream frequency.Therefore the feeding network that this feeding network can be used as dual-band and dual-feed point antenna can make this dual-band and dual-feed point antenna realize different circular polarization in different operating frequencies.
(5) described double-frequency biorthogonal phase output power division feeding network adopts left-right-hand composite transmission line design, has realized the miniaturization of feeding network.
(6) left-right-hand composite transmission line in described double-frequency biorthogonal phase output power division feeding network has adopted interdigital capacitor and short circuit metal wire, has integrated and processing and feature with low cost.
Accompanying drawing explanation
Fig. 1 a is double-frequency biorthogonal phase output power division feeding network structural representation in execution mode.
Fig. 1 b is the π type cellular construction schematic diagram of left-right-hand composite transmission line in execution mode.
Fig. 2 a is each reflection coefficient of port loss result figure in execution mode.
Fig. 2 b is the insertion loss result figure between input port and output port in execution mode.
Fig. 2 c is the isolation curve chart between output port in execution mode.
Fig. 2 d is the phase difference curve chart between output port in execution mode.
Embodiment
Below in conjunction with accompanying drawing, enforcement of the present invention is elaborated, but the protection range that the present invention requires is not limited to following execution mode.
As shown in Figure 1, described double-frequency biorthogonal phase output power division feeding network adopts the form of microstrip circuit to realize, comprise the first microstrip transmission line 1, the second microstrip transmission line 2, the 3rd microstrip transmission line 3, the first left-right-hand composite transmission line 4, the second left-right-hand composite transmission line 5, the 4th microstrip transmission line 6, five microstrip transmission lines 7, be connected across isolation resistance R, the 3rd left-right-hand composite transmission line 8, the six microstrip transmission lines 9 on the four or five microstrip transmission line; One end of the first microstrip transmission line 1 is as the first port of described double-frequency biorthogonal phase output power division feeding network, and the other end of the first microstrip transmission line 1 connects one end of the second microstrip transmission line 2 and one end of the 3rd microstrip transmission line 3; The other end of the second microstrip transmission line 2 connects one end of the first left-right-hand composite transmission line 4, the other end of the first left-right-hand composite transmission line 4 connects one end of the 4th microstrip transmission line 6, and the other end of the 4th microstrip transmission line 6 is as the second port of described double-frequency biorthogonal phase output power division feeding network; The other end of the 3rd microstrip transmission line 3 connects one end of the second left-right-hand composite transmission line 5, the other end of the second left-right-hand composite transmission line 5 connects the 5th microstrip transmission line 7 one end, the other end of the 5th microstrip transmission line 7 connects one end of the 3rd left-right-hand composite transmission line 8, the other end of the 3rd left-right-hand composite transmission line 8 connects one end of the 6th microstrip transmission line 9, and the other end of the 6th microstrip transmission line 9 is as the 3rd port of described double-frequency biorthogonal phase output power division feeding network; Isolation resistance R is connected across between the 4th microstrip transmission line 6 and the 5th microstrip transmission line 7.
The characteristic impedance of described double-frequency biorthogonal phase output power division feeding network the first microstrip transmission line 1, the 4th microstrip transmission line 6, five microstrip transmission lines 7 is
; The second microstrip transmission line 2 in double-frequency biorthogonal phase output power division feeding network, the characteristic impedance of the 3rd microstrip transmission line 3 are
; The characteristic impedance of the first left-right-hand composite transmission line 4, the second left-right-hand composite transmission line 5 is
; The characteristic impedance of the 3rd left-right-hand composite transmission line 8 is
; The resistance value of isolation resistance R is 2
;
The described first to the 3rd left-right-hand composite transmission line is by one or more π type cell formation in Fig. 1 b; Described left-right-hand composite transmission line comprises one or more π type unit, and each π type unit comprises an interdigital capacitor 10 and is positioned at two short circuit metal wires at interdigital capacitor two ends; In the time adopting more than two π type cell formation left-right-hand composite transmission line, described more than two π type unit connects according to series system; Interdigital capacitor parameter in described more than two π type unit is consistent, and the short circuit metal wire parameter in described more than two π type unit is consistent; The characteristic impedance of described left-right-hand composite transmission line and phase relation are by the parameter control of one or more π type unit in transmission line; Described the first left-right-hand composite transmission line is identical with the second left-right-hand composite transmission line, in the time adopting two to four π type cell formation the first left-right-hand composite transmission lines 4 or the second left-right-hand composite transmission line 5, the capacity of the interdigital capacitor in π type unit is 0.6pF to 1.3pF, and the inductance value that the short circuit metal wire 11 and 12 in π type unit provides is 6nH to 13 nH; In the time adopting two to four π type cell formation the 3rd left-right-hand composite transmission lines 8, the capacity of the interdigital capacitor in π type unit is 0.9pF to 2pF, and the inductance value that the short circuit metal wire 11 and 12 in π type unit provides is 4.4nH to 8.8 nH.
Described the 4th microstrip transmission line 6 is identical with the length of the 5th microstrip transmission line 7, and can choose arbitrarily according to the circuit conditions of feeding network connection, and the first microstrip transmission line 1 length can be chosen arbitrarily.
Embodiment
More than explanation explicit for a person skilled in the art, below content be only a kind of embodiment, be not intended to limit the scope of the invention.Dielectric substrate thickness 1.524mm, relative dielectric constant is 3.55, and the ground of medium substrate is metal floor, and another side is described double-frequency biorthogonal phase output power division feeding network; The output impedance of the first port, the second port and the 3rd port of described double-frequency biorthogonal phase output power division feeding network is 50 ohm; The characteristic impedance of the first microstrip transmission line 1, the 4th microstrip transmission line 6 and the 5th microstrip transmission line 7 is 50 ohm, and width is 3.38mm.The second microstrip transmission line 2, the 3rd microstrip transmission line 3 characteristic impedances are 70.7 ohm, and width is 1.875mm.The characteristic impedance of the first left-right-hand composite transmission line 4 and the second left-right-hand composite transmission line 5 is 70.7 ohm.The first left-right-hand composite transmission line 4 is identical with the second left-right-hand composite transmission line 5, comprise respectively three π type unit, interdigital capacitor overall width in each π type unit is 1.875mm, length is 6.492mm, interdigital capacitor finger width in each π type unit is 0.125mm, have 4 pairs, 8 fingers, the distance between finger is 0.125mm; Short circuit metal wire 11 in each π type unit is identical with the parameter of short circuit bonding jumper 12, be connected to metallization via hole on the floor of substrate back at short circuit bonding jumper 11 and short circuit metal 12 ends, via diameter 0.5mm, the width of short circuit metal wire 11 and short circuit metal 12 is 0.3mm, and the length of short circuit metal wire 11 and short circuit metal wire 12 is 8.062mm.
The 3rd left-right-hand composite transmission line 8 characteristic impedances are 50 ohm, comprise three π type unit, interdigital capacitor overall width in each π type unit is 3.38mm, length is 5.386mm, interdigital capacitor finger width in each π type unit is 0.125mm, have 7 pairs, 14 fingers, the distance between finger is 0.125mm; Short circuit metal wire 11 in each π type unit is identical with the parameter of short circuit bonding jumper 12, be connected to metallization via hole on the floor of substrate back at short circuit bonding jumper 11 and short circuit bonding jumper 12 ends, via diameter 0.5mm, the width of short circuit metal wire 11 and short circuit bonding jumper 12 is 0.3mm, and the length of short circuit metal wire 11 and short circuit metal wire 12 is 5.956mm.
The result that each parameter in employing enforcement illustration obtains as shown in Figure 2.
From Fig. 2 a, can see that described double-frequency biorthogonal phase output power division feeding network first, to the return loss be less than-15dB of the 3rd port in the uplink and downlink working frequency points of Beidou satellite navigation system, therefore all realized matched well at each port; In Fig. 2 b, draw from the first port to the second port and the transmission coefficient of the first port to the three ports, be-3.36 dBs to the transmission coefficient range value of the second port at the upstream frequency 1.618GHz of big-dipper satellite by known the first port of Fig. 2 b, at downstream frequency 2.494 GHz of big-dipper satellite be-3.30dB; Equally, be-3.75dB to be-3.49dB at Beidou satellite navigation system upstream frequency 1.618GHz at the downstream frequency 2.494GHz of Beidou satellite navigation system by the transmission coefficient range value of known the first port to the three ports of Fig. 2 b; Therefore, amplitude imbalance degree between described double-frequency biorthogonal phase output power division feeding network the second port and the 3rd port is 0.29dB at the upstream frequency 1.618GHz of Beidou satellite navigation system, be 0.19dB at the downstream frequency 2.494GHz of Beidou satellite navigation system, this explanation feeding network has been realized good amplitude balance; Fig. 2 c has drawn the isolation between described double-frequency biorthogonal phase output power division feeding network the second port and the 3rd port.By Fig. 2 c, isolation between the second port and the 3rd port is 22.86dB at the upstream frequency 1.618GHz of Beidou satellite navigation system, be 22.25 at the downstream frequency 2.494GHz of Beidou satellite navigation system, between this explanation double-frequency biorthogonal phase output power division feeding network second port and the 3rd port, realized good isolation; Fig. 2 d has drawn the phase relation between double-frequency biorthogonal phase output power division feeding network the second port and the 3rd port, be-90 degree by the known phase difference between the upstream frequency 1.618GHz of Beidou satellite navigation system the second port and the 3rd port of Fig. 2 d, the phase difference between the downstream frequency 2.494GHz of Beidou satellite navigation system the second port and the 3rd port is+90 degree; This explanation is orthogonality relation in the upstream frequency of Beidou satellite navigation system and the phase relation of the above double-frequency biorthogonal phase output power division feeding network second port of downstream frequency and the 3rd port; The above results explanation the present invention has realized the mean allocation of power at the upstream frequency 1.618GHz of Beidou satellite navigation system and the downstream frequency 2.494GHz of Beidou satellite navigation system, and on described double-frequency biorthogonal phase output power division feeding network the second port and the 3rd port, on upstream frequency and downstream frequency, has formed respectively the biorthogonal phase relation of leading 90 degree of phase place and phase place quadrature lagging.
Claims (5)
1. a double-frequency biorthogonal phase output power division feeding network, comprises that the double frequency Wilkinson power splitter based on left-right-hand composite transmission line, the double frequency 90 based on left-right-hand composite transmission line spend phase-shifter, medium substrate and floor metal level; The described double frequency Wilkinson power splitter based on left-right-hand composite transmission line, the double frequency 90 based on left-right-hand composite transmission line are spent phase-shifter and are attached to a side of medium substrate, and floor metal level is attached to the opposite side of medium substrate; Described double frequency Wilkinson power splitter comprises the first microstrip transmission line, the second microstrip transmission line, the 3rd microstrip transmission line, the first left-right-hand composite transmission line, the second left-right-hand composite transmission line, the 4th microstrip transmission line, the 5th microstrip transmission line and isolation resistance R; One end of the first microstrip transmission line is as the first port of described double-frequency biorthogonal phase output power division feeding network, and the other end of the first microstrip transmission line connects one end of the second microstrip transmission line and one end of the 3rd microstrip transmission line; The other end of the second microstrip transmission line connects one end of the first left-right-hand composite transmission line, the other end of the first left-right-hand composite transmission line connects one end of the 4th microstrip transmission line, and the other end of the 4th microstrip transmission line is as the second port of described double-frequency biorthogonal phase output power division feeding network; The other end of the 3rd microstrip transmission line connects one end of the second left-right-hand composite transmission line, the other end of the second left-right-hand composite transmission line connects the 5th microstrip transmission line one end, the other end of the 5th microstrip transmission line connects one end of the 3rd left-right-hand composite transmission line, the other end of the 3rd left-right-hand composite transmission line connects the 6th microstrip transmission line, and the other end of the 6th microstrip transmission line is as the 3rd port of described double-frequency biorthogonal phase output power division feeding network; Isolation resistance R is connected across between the 4th and the 5th microstrip transmission line; Described the first port is all less than 0.3 dB to the range value difference between the transmission coefficient of the second port and the transmission coefficient of the first port to the three ports on 1.618GHz and two frequencies of 2.492GHz.
2. double-frequency biorthogonal phase output power division feeding network according to claim 1, is characterized in that described left-right-hand composite transmission line is by one or more π type cell formations; While adopting described in two above π type cell formations left-right-hand composite transmission line, described two above π type unit connect with series system.
3. double-frequency biorthogonal phase output power division feeding network according to claim 2, the first module port that it is characterized in that described π type unit one end in interdigital capacitor, the other end of interdigital capacitor is as the second unit port of π type unit; One end of the first short circuit metal wire is connected to first module port edge, the other end of the first short circuit metal wire is the metallic vias that is connected to the medium back side, one end of the second short circuit metal wire is connected to second unit port edge, and the other end of the second short circuit metal wire is the metallic vias that is connected to the medium back side.
4. double-frequency biorthogonal phase output power division feeding network according to claim 1, is characterized in that the first output impedance to the 3rd port of described double-frequency biorthogonal phase output power division feeding network is
; The characteristic impedance of the first microstrip transmission line, the 4th microstrip transmission line, the 5th microstrip transmission line, the 6th microstrip transmission line and the 3rd left-right-hand composite transmission line is
; The characteristic impedance of the second microstrip transmission line, the 3rd microstrip transmission line, the first left-right-hand composite transmission line and the second left-right-hand composite transmission line is
.
5. double-frequency biorthogonal phase output power division feeding network according to claim 1, is characterized in that phase relation between described double-frequency biorthogonal phase output power division feeding network the second port and the 3rd port meets the relation that is respectively leading 90 degree and quadrature lagging at the upstream frequency 1.618GHz of Beidou satellite navigation system and two frequencies of downstream frequency 2.492GHz.
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| US10680346B2 (en) * | 2016-04-06 | 2020-06-09 | Commscope Technologies Llc | Antenna system with frequency dependent power distribution to radiating elements |
| CN106099299B (en) * | 2016-08-03 | 2021-06-04 | 广东工业大学 | Miniaturized high-isolation microwave double-frequency power divider |
| CN111147118A (en) * | 2019-11-22 | 2020-05-12 | 纳瓦电子（上海）有限公司 | Method for improving Wifi directional transmission performance by utilizing antenna left-right rotation polarization |
| CN112290222B (en) * | 2020-09-27 | 2021-10-08 | 南京大学 | Programmable anisotropic coded super surface |
| CN112821880B (en) * | 2020-12-25 | 2022-12-23 | 北京邮电大学 | Double-circuit double-frequency matching network |
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