CN102324623A - 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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- CN102324623A CN102324623A CN201110255131A CN201110255131A CN102324623A CN 102324623 A CN102324623 A CN 102324623A CN 201110255131 A CN201110255131 A CN 201110255131A CN 201110255131 A CN201110255131 A CN 201110255131A CN 102324623 A CN102324623 A CN 102324623A
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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 place output work and divide feeding network, can be used as the dual-band dual-circular polarization feeding network of array antennas in the Beidou satellite navigation system terminal equipment.
Background technology
The satellite navigation industry is a national strategy property 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 economic new growth point of the 3rd IT.With american global positioning system GPS is that the satellite and the positioning GPS application industry of representative progressively becomes a global new high-tech industry.The satellite navigation industry of China is just getting into the crucial moment of industrialization high speed development, estimates in five to ten years from now on, will form the market of a great scale.
Along with the development of Beidou satellite navigation system, for the demand of Beidou satellite navigation system with increasing.Beidou satellite navigation system can provide satellite fix service and data, services simultaneously, and this is an important difference with other satellite navigation systems.The client of Beidou satellite navigation system also can be sent data message through system through system's receiving satellite positioning signals, this antenna that requires client receive with send two frequencies on have different circular polarization directions and disturb to reduce.This kind equipment adopts two slave antennas to be operated in the emission frequency respectively usually and receives frequency, and adopts different feeding networks respectively to reception antenna and transmitting antenna feed.
But design at present can be simultaneously receiving and is sending two frequency ranges and provide the feeding network of different quadrature phase to have following technological difficulties:
1, the double frequency biorthogonal of SF single feed network technology
Generally, the double-fed point circular polarized antenna that is operated in satellite communication system uplink and downlink frequency simultaneously need use two feeding networks and two feed port to be respectively the antenna that is operated in 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 that two double-fed point circular polarized antennas that are operated in upstream frequency and downstream frequency are carried out feed, need to guarantee that the phase place of two output ports of this feeding network on upstream frequency and downstream frequency satisfies orthogonality relation.This orthogonality relation also need satisfy leading 90 degree of phase place and phase lag 90 degree respectively on the upstream frequency of Beidou satellite navigation system and downstream frequency, could guarantee that the circular polarization rotation direction of reception and 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 purpose; Phase difference when supposing to be operated in the Beidou satellite navigation system upstream frequency between two output ports of feeding network be leading 90 the degree, during the Beidou satellite navigation system downstream frequency between two output ports of feeding network phase difference be quadrature lagging.Because traditional transmission line is weak chromatic dispersion transmission line, the pass between its phase characteristic and the frequency ties up in the big frequency range and is linear characteristic basically.The low frequency of the double frequency biorthogonal network that employing conventional transmission line is realized and the relation of high-frequency work Frequency point are generally
, and do not satisfy this relation between the upstream frequency of Beidou satellite navigation system and the downstream frequency.So the double frequency biorthogonal network with this transmission line is realized can not be as the feeding network of Beidou satellite navigation system.
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 the single network of single port.Usually will design two different feeding networks and be respectively the two subtask frequencies antenna feed opposite with polarised direction, this feeding classification volume is bigger.The quadrature feeding network and the antenna that are operated in different frequency make terminal equipment comparatively complicated, and take than large space.
Summary of the invention
The objective of the invention is to overcome the deficiency of prior art; Provide a kind of double frequency biorthogonal phase place output work to divide feeding network, make said double frequency biorthogonal phase place output work divide feeding network can be used as and be operated in the feeding network of the dual-band and dual-feed point circular polarized antenna in the Beidou satellite navigation system and realize the 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 adopt microstrip transmission line and left-right-hand composite transmission line to realize the double frequency 90 degree phase-shifters based on left-right-hand composite transmission line, and divide between second port and the 3rd port of feeding network to have realized on said two ports that phase relation satisfies in the Beidou satellite navigation system upstream frequency in said double frequency biorthogonal phase place output work be leading 90 to spend and be the double frequency biorthogonal phase characteristic of quadrature lagging at downstream frequency.In addition, owing to adopted the left-right-hand composite transmission line with nonlinear phase characteristic, the present invention also to have miniaturization, be convenient to machining characteristics.
The object of the invention is realized through following technical scheme:
A kind of double frequency biorthogonal phase place output work is divided feeding network, comprises double frequency Wilkinson power splitter based on left-right-hand composite transmission line, based on double frequency 90 degree phase-shifter, medium substrate and the floor metal levels of left-right-hand composite transmission line; Said double frequency Wilkinson power splitter based on left-right-hand composite transmission line, based on the side of the double frequency of left-right-hand composite transmission line 90 degree phase-shifters attached to medium substrate, the floor metal level is attached to the opposite side of medium substrate.
Above-mentioned double frequency biorthogonal phase place output work is divided in the feeding network, and said double frequency Wilkinson power splitter comprises first microstrip transmission line, second microstrip transmission line, the 3rd microstrip transmission line, first left-right-hand composite transmission line, second left-right-hand composite transmission line, the 4th microstrip transmission line, the 5th microstrip transmission line and isolation resistance R; One end of first microstrip transmission line divides first port of feeding network as said double frequency biorthogonal phase place output work, and the other end of first microstrip transmission line connects an end of second microstrip transmission line and an end of the 3rd microstrip transmission line; The other end of second microstrip transmission line connects an end of first left-right-hand composite transmission line; The other end of first left-right-hand composite transmission line connects an end of the 4th microstrip transmission line, and the other end of the 4th microstrip transmission line divides second port of feeding network as said double frequency biorthogonal phase place output work; The other end of the 3rd microstrip transmission line connects an end of second left-right-hand composite transmission line; The other end of 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 an 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 divides the 3rd port of feeding network as said double frequency biorthogonal phase place output work; Isolation resistance R is connected across between the 4th and the 5th microstrip transmission line.
Above-mentioned double frequency biorthogonal phase place output work is divided in the feeding network, and said left-right-hand composite transmission line is made up of one or more π types unit; When adopting π type unit more than two to constitute said left-right-hand composite transmission line, said π type unit more than two connects with series system.
Above-mentioned double frequency biorthogonal phase place output work is divided in the feeding network, and the first module port of said π type unit is in an end of interdigital capacitor, and 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 the 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 the 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.
Above-mentioned double frequency biorthogonal phase place output work is divided in the feeding network, and said double frequency biorthogonal phase place output work divides the output impedance of first to the 3rd port of feeding network for
; The characteristic impedance of 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 second microstrip transmission line, the 3rd microstrip transmission line, first left-right-hand composite transmission line and second left-right-hand composite transmission line is
.
Above-mentioned double frequency biorthogonal phase place output work is divided in the feeding network, and said double frequency biorthogonal phase place output work divides the phase relation between feeding network second port and the 3rd port to satisfy 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.
Above-mentioned double frequency biorthogonal phase place output work is divided in the feeding network, first port that described double frequency biorthogonal phase place output work is divided feeding network to the range value difference between the transmission coefficient of the transmission coefficient of second port and first port to the, three ports on 1.618GHz and two frequencies of 2.492GHz all less than 0.3 dB.
Compared with prior art, the present invention has following advantage and technique effect:
(1) double frequency biorthogonal phase place output work of the present invention divides phase relation between feeding network second port and the 3rd port to satisfy the relation that upstream frequency 1.618GHz and two frequencies of downstream frequency 2.492GHz at Beidou satellite navigation system are respectively leading 90 degree and quadrature lagging.
(2) said double frequency biorthogonal phase place output work divides feeding network to realize good power division and amplitude balance degree, 1.618GHz and the above double frequency biorthogonal phase place output work of two frequencies of 2.492GHz divide feeding network first port to the range value difference between the transmission coefficient between transmission coefficient between second port and first port to the, three ports on 1.618GHz and two frequencies of 2.492GHz all less than 0.3 dB.
(3) said double frequency biorthogonal phase place output work divides feeding network to realize less frequency ratio, is to realize the mean allocation of power on 1.618 GHz and two frequencies of 2.492 GHz in frequency promptly, and its operating frequency is than being 2.492/1.618.
(4) said double frequency biorthogonal phase place output work divides the phase difference between feeding network second port and the 3rd port on the upstream frequency of Beidou satellite navigation system and downstream frequency, to realize different orthogonal properties respectively.Therefore this feeding network can be used as dual-band and dual-feed point feeding network of array antennas and can on the different working frequency, make the different circular polarization of this dual-band and dual-feed point antenna realization.
(5) said double frequency biorthogonal phase place output work divides feeding network to adopt the left-right-hand composite transmission line design, has realized the miniaturization of feeding network.
(6) said double frequency biorthogonal phase place output work divides the left-right-hand composite transmission line in the feeding network to adopt interdigital capacitor and short circuit metal wire, has integrated and processing and characteristics with low cost.
Description of drawings
Fig. 1 a is that double frequency biorthogonal phase place output work is divided the feeding network structural representation in the execution mode.
Fig. 1 b is the π type cellular construction sketch map of left-right-hand composite transmission line in the execution mode.
Fig. 2 a is each port return loss figure as a result in the execution mode.
Fig. 2 b is the figure as a result of the insertion loss between input port and the output port in the execution mode.
Fig. 2 c is the isolation curve chart between the output port in the execution mode.
Fig. 2 d is the phase difference curve chart between the output port in the 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; Said double frequency biorthogonal phase place output work divides feeding network to adopt the form of microstrip circuit to realize; Comprise first microstrip transmission line 1, second microstrip transmission line 2, the 3rd microstrip transmission line 3, first left-right-hand composite transmission line 4, 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 first microstrip transmission line 1 divides first port of feeding network as said double frequency biorthogonal phase place output work, and the other end of first microstrip transmission line 1 connects an end of second microstrip transmission line 2 and an end of the 3rd microstrip transmission line 3; The other end of second microstrip transmission line 2 connects an end of first left-right-hand composite transmission line 4; The other end of first left-right-hand composite transmission line 4 connects an end of the 4th microstrip transmission line 6, and the other end of the 4th microstrip transmission line 6 divides second port of feeding network as said double frequency biorthogonal phase place output work; The other end of the 3rd microstrip transmission line 3 connects an end of second left-right-hand composite transmission line 5; The other end of second left-right-hand composite transmission line 5 connects the 5th microstrip transmission line 7 one ends; The other end of the 5th microstrip transmission line 7 connects an 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 an end of the 6th microstrip transmission line 9, and the other end of the 6th microstrip transmission line 9 divides the 3rd port of feeding network as said double frequency biorthogonal phase place output work; Isolation resistance R is connected across between the 4th microstrip transmission line 6 and the 5th microstrip transmission line 7.
Said double frequency biorthogonal phase place output work divide feeding network first microstrip transmission line 1, the 4th microstrip transmission line 6, five microstrip transmission lines 7 characteristic impedance is
; Double frequency biorthogonal phase place output work divide second microstrip transmission line 2 in the feeding network, the 3rd microstrip transmission line 3 characteristic impedance is
; The characteristic impedance of first left-right-hand composite transmission line 4, 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 be 2
;
Said first to the 3rd left-right-hand composite transmission line is made up of one or more π type unit among Fig. 1 b; Said left-right-hand composite transmission line comprises one or more π type unit, and each π type unit comprises an interdigital capacitor 10 and two short circuit metal wires that are positioned at the interdigital capacitor two ends; When the π type unit of employing more than two constituted left-right-hand composite transmission line, said two above π type unit connected according to series system; Interdigital capacitor parameter in said two above π type unit is consistent, and the short circuit metal wire parameter in said two above π type unit is consistent; The characteristic impedance of said left-right-hand composite transmission line and phase relation are by the parameter control of one or more π type unit in the transmission line; Said first left-right-hand composite transmission line and second left-right-hand composite transmission line are identical; When adopting two to four π type unit to constitute first left-right-hand composite transmission line 4 or second left-right-hand composite transmission line 5; The capacity of the interdigital capacitor in the π type unit is 0.6pF to 1.3pF, and the inductance value that the short circuit metal wire 11 and 12 in the π type unit provides is 6nH to 13 nH; When adopting two to four π type unit to constitute the 3rd left-right-hand composite transmission line 8, the capacity of the interdigital capacitor in the π type unit is 0.9pF to 2pF, and the inductance value that the short circuit metal wire 11 and 12 in the π type unit provides is 4.4nH to 8.8 nH.
Said 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 that feeding network connects, and first microstrip transmission line, 1 length can be chosen arbitrarily.
Embodiment
More than explanation is explicit for a person skilled in the art, and following content is merely a kind of embodiment, is not used in qualification protection scope of the present invention.Dielectric substrate thickness 1.524mm, relative dielectric constant are 3.55, and the ground of medium substrate is metal floor, and another side is that said double frequency biorthogonal phase place output work is divided feeding network; Said double frequency biorthogonal phase place output work divides the output impedance of first port, second port and the 3rd port of feeding network to be 50 ohm; The characteristic impedance of 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.Second microstrip transmission line 2,3 characteristic impedances of the 3rd microstrip transmission line are 70.7 ohm, and width is 1.875mm.The characteristic impedance of first left-right-hand composite transmission line 4 and second left-right-hand composite transmission line 5 is 70.7 ohm.First left-right-hand composite transmission line 4 and second left-right-hand composite transmission line 5 are identical; Comprise three π type unit respectively; Interdigital capacitor overall width in each π type unit is 1.875mm, and length is 6.492mm, and the interdigital capacitor finger width in each π type unit is 0.125mm; Have 4 pairs, 8 fingers, the distance between the finger is 0.125mm; The short circuit metal wire 11 in each π type unit and the parameter of short circuit bonding jumper 12 are identical; Be connected on the floor of substrate back with the metallization via hole 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.
8 characteristic impedances of the 3rd left-right-hand composite transmission line are 50 ohm; Comprise three π type unit; Interdigital capacitor overall width in each π type unit is 3.38mm, and length is 5.386mm, and the interdigital capacitor finger width in each π type unit is 0.125mm; Have 7 pairs, 14 fingers, the distance between the finger is 0.125mm; The short circuit metal wire 11 in each π type unit and the parameter of short circuit bonding jumper 12 are identical; Be connected on the floor of substrate back with the metallization via hole 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.
Adopt the resulting result of each parameter who implements in the illustration as shown in Figure 2.
From Fig. 2 a, can see said double frequency biorthogonal phase place output work divide feeding network first to the 3rd port in the return loss of the uplink and downlink working frequency points of Beidou satellite navigation system less than-15dB, therefore all realized matched well at each port; Drawn from first port to second port among Fig. 2 b and the transmission coefficient of first port to the, three ports; Can know that by Fig. 2 b first port is-3.36 dB to the transmission coefficient range value of second port at the upstream frequency 1.618GHz of big-dipper satellite, be-3.30dB at downstream frequency 2.494 GHz of big-dipper satellite; Equally, the transmission coefficient range value that can be known first port to the, three ports by Fig. 2 b is-3.75dB at Beidou satellite navigation system upstream frequency 1.618GHz, at the downstream frequency 2.494GHz of Beidou satellite navigation system is-3.49dB; Therefore; It is 0.29dB at the upstream frequency 1.618GHz of Beidou satellite navigation system that said double frequency biorthogonal phase place output work is divided the amplitude imbalance degree between feeding network second port and the 3rd port; At the downstream frequency 2.494GHz of Beidou satellite navigation system is 0.19dB, and this explanation feeding network has been realized good amplitude balance degree; Fig. 2 c said double frequency biorthogonal phase place output work of having drawn is divided the isolation between feeding network second port and the 3rd port.By Fig. 2 c; Isolation between second port and the 3rd port is 22.86dB at the upstream frequency 1.618GHz of Beidou satellite navigation system; At the downstream frequency 2.494GHz of Beidou satellite navigation system is 22.25, and this explanation double frequency biorthogonal phase place output work is divided between feeding network second port and the 3rd port and realized good isolation; Fig. 2 d double frequency biorthogonal phase place output work of having drawn is divided the phase relation between feeding network second port and the 3rd port; Can know that by Fig. 2 d the phase difference between the upstream frequency 1.618GHz of Beidou satellite navigation system second port and the 3rd port is-90 degree, the phase difference between the downstream frequency 2.494GHz of Beidou satellite navigation system second port and the 3rd port is+90 degree; This explanation divides the phase relation of feeding network second port and the 3rd port to be orthogonality relation in upstream frequency and the above double frequency biorthogonal phase place output work of downstream frequency of Beidou satellite navigation system; The above results explanation the present invention has realized the mean allocation of power at the downstream frequency 2.494GHz of the upstream frequency 1.618GHz of Beidou satellite navigation system and Beidou satellite navigation system, and divides in said double frequency biorthogonal phase place output work and on upstream frequency and downstream frequency, to have formed the biorthogonal phase relation that phase place leading 90 is spent and phase lag 90 is spent on feeding network second port and the 3rd port respectively.
Claims (7)
1. a double frequency biorthogonal phase place output work is divided feeding network, comprises double frequency Wilkinson power splitter based on left-right-hand composite transmission line, based on double frequency 90 degree phase-shifter, medium substrate and the floor metal levels of left-right-hand composite transmission line; Said double frequency Wilkinson power splitter based on left-right-hand composite transmission line, based on the side of the double frequency of left-right-hand composite transmission line 90 degree phase-shifters attached to medium substrate, the floor metal level is attached to the opposite side of medium substrate.
2. double frequency biorthogonal phase place output work according to claim 1 is divided feeding network, it is characterized in that said double frequency Wilkinson power splitter comprises first microstrip transmission line, second microstrip transmission line, the 3rd microstrip transmission line, first left-right-hand composite transmission line, second left-right-hand composite transmission line, the 4th microstrip transmission line, the 5th microstrip transmission line and isolation resistance R; One end of first microstrip transmission line divides first port of feeding network as said double frequency biorthogonal phase place output work, and the other end of first microstrip transmission line connects an end of second microstrip transmission line and an end of the 3rd microstrip transmission line; The other end of second microstrip transmission line connects an end of first left-right-hand composite transmission line; The other end of first left-right-hand composite transmission line connects an end of the 4th microstrip transmission line, and the other end of the 4th microstrip transmission line divides second port of feeding network as said double frequency biorthogonal phase place output work; The other end of the 3rd microstrip transmission line connects an end of second left-right-hand composite transmission line; The other end of 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 an 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 divides the 3rd port of feeding network as said double frequency biorthogonal phase place output work; Isolation resistance R is connected across between the 4th and the 5th microstrip transmission line.
3. divide feeding network according to the said double frequency biorthogonal of claim 2 phase place output work, it is characterized in that said first port to the range value difference between the transmission coefficient of the transmission coefficient of second port and first port to the, three ports on 1.618GHz and two frequencies of 2.492GHz all less than 0.3 dB.
4. double frequency biorthogonal phase place output work according to claim 2 is divided feeding network, it is characterized in that said left-right-hand composite transmission line is made up of one or more π types unit; When adopting π type unit more than two to constitute said left-right-hand composite transmission line, said π type unit more than two connects with series system.
5. double frequency biorthogonal phase place output work according to claim 3 is divided feeding network, it is characterized in that the first module port of said π type unit is in an end of interdigital capacitor, and 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 the 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 the 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.
6. divide feeding network according to the said double frequency biorthogonal of claim 2 phase place output work, it is characterized in that the output impedance of first to the 3rd port that said double frequency biorthogonal phase place output work divides feeding network is for
; The characteristic impedance of 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 second microstrip transmission line, the 3rd microstrip transmission line, first left-right-hand composite transmission line and second left-right-hand composite transmission line is
.
7. double frequency biorthogonal phase place output work according to claim 2 is divided feeding network, it is characterized in that said double frequency biorthogonal phase place output work divides phase relation between feeding network second port and the 3rd port to satisfy the relation that upstream frequency 1.618GHz and two frequencies of downstream frequency 2.492GHz at Beidou satellite navigation system are respectively leading 90 degree and quadrature lagging.
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| CN112290222A (en) * | 2020-09-27 | 2021-01-29 | 南京大学 | Programmable anisotropic coded super surface |
| CN112821880A (en) * | 2020-12-25 | 2021-05-18 | 北京邮电大学 | Double-path double-frequency matching network |
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| CN104064959A (en) * | 2014-06-27 | 2014-09-24 | 北京邮电大学 | Miniaturized micro-strip power divider |
| CN104064959B (en) * | 2014-06-27 | 2016-08-24 | 北京邮电大学 | The microstrip power divider of miniaturization |
| CN109155457A (en) * | 2016-04-06 | 2019-01-04 | 康普技术有限责任公司 | The antenna system of distribution of power with the frequency dependence to radiating element |
| CN109155457B (en) * | 2016-04-06 | 2021-08-06 | 康普技术有限责任公司 | Antenna system with frequency dependent power distribution to radiating elements |
| CN106099299A (en) * | 2016-08-03 | 2016-11-09 | 广东工业大学 | A kind of microwave dual-frequency power divider of miniaturization high-isolation |
| 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 |
| CN112290222A (en) * | 2020-09-27 | 2021-01-29 | 南京大学 | Programmable anisotropic coded super surface |
| CN112821880A (en) * | 2020-12-25 | 2021-05-18 | 北京邮电大学 | Double-path double-frequency matching network |
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