CN107887702A - A kind of multifrequency left-right-hand circular polarization reconfigurable antenna - Google Patents
A kind of multifrequency left-right-hand circular polarization reconfigurable antenna Download PDFInfo
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/30—Arrangements for providing operation on different wavebands
- H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/50—Feeding or matching arrangements for broad-band or multi-band operation
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Abstract
The present invention discloses a kind of multifrequency left-right-hand circular polarization reconfigurable antenna, including one-to-two etc. power splitter, ± 90 degree of phasing transmission lines and dual-port orthogonal feed circular polarized antenna.By one is long and the other is short, two transmission lines form ± 90 degree of phasing transmission lines, parallel connection is loaded with length identical open circuit minor matters and short-circuit minor matters wherein in short transmission line, and the length sum of open circuit minor matters and short-circuit minor matters is equal to the difference of the length of long transmission line and short transmission line, long and short transmission line and the characteristic impedance all same of open circuit minor matters and short-circuit minor matters.The present invention it is simple in construction, and can it is multiple close to frequency band in realize left-right-hand circular polarization alternation successively, the antijamming capability of multi-functional communications system can be effectively improved.
Description
Technical Field
The invention relates to the technical field of antennas for wireless communication, in particular to a multi-frequency left-right-handed circular polarization reconfigurable antenna.
Background
An antenna is a device for an electronic system to exchange information with an external space, and is a vital and indispensable part of a wireless communication system. With the continuous development of science and technology and society, the performance requirements on the antenna are higher and higher, and in a modern wireless application system, a single linear polarization antenna is difficult to meet the requirements of people, and a circular polarization antenna is more and more widely concerned. The multi-frequency circularly polarized antenna is widely applied to multifunctional systems such as communication, remote sensing and remote measuring, radar, electronic reconnaissance, electronic interference and the like because of the special performance of the multi-frequency circularly polarized antenna. Common multi-band circular polarized antennas are generally dual-band, triple-band and quad-band circular polarized antennas, and there are few reports of circular polarized antennas with more bands. The working frequency bands of the existing dual-frequency and multi-frequency circularly polarized antennas are generally spaced at a larger interval and have the same circularly polarized rotation direction, so that the performances of anti-interference and the like of an electronic system are reduced.
A Dual-Band Dual-circular Polarized Microstrip antenna Array is proposed in the document "Dual-Band and Dual-circular Polarized Single-Layer Microstrip Array Based on Multiresonant models (Jin-Dong Zhang; lei Zhu; neng-Wu Liu; wen Wu, IEEE Transactions on Antennas & Propagation,2017,65 (3): 1428-1433)", and circular polarization is realized by loading 4 branches on the edge of a Microstrip patch antenna unit, and the antenna realizes left-hand circular polarization and right-hand circular polarization at 2.53GHz and 3.59GHz respectively. Although the method has a simple structure, the two working frequency bands have larger interval, and the working frequency bands are difficult to expand further.
A design method of a narrow-Band Dual-circular Polarized antenna (12.17 GHz for right-handed circular polarization and 17.5GHz for left-handed circular polarization) and a broadband Dual-Band Dual-circular Polarized antenna (12.1 GHz for right-handed circular polarization and 17.4GHz for left-handed circular polarization) is proposed in the document "Dual-Band and Dual-circular Polarized antenna With Single Layer-Layer Substrate (Jin-Dong Zhang; wenWu; da-gan Fan, IEEE Transactions on Antennas & Propagation,2016,64 (1): 109-116)". The narrow-band dual-frequency dual-circular polarized antenna realizes dual-frequency dual-circular polarization by arraying two slotted radiation patches with different sizes. The bandwidth of the broadband dual-frequency dual-circular polarization is expanded by a sequential phase rotation technology. The two antennas have complex structures and designs, and the two frequency bands have large intervals, so that the working frequency band is difficult to further expand.
In the document "Dual-Band CP Antenna with a Dual-Ring Cable for Enhanced Beamwidth (Shao-Li Zuo; long Yang; zhi-Ya Zhang, IEEE Antennas and Wireless ProPayment Letters,2015, 867-870)", dual-frequency circular polarization is realized by respectively carrying out 90-degree orthogonal feeding on double-layer conical patches, and meanwhile, the working bandwidth of the Antenna is improved by introducing a double-Ring Cavity. Although the dual-frequency circularly polarized antenna reduces the distance between the working frequency bands (the central working frequency is 1.268GHz and 1.561GHz respectively), the change of the circular polarization rotation direction on different working frequency bands is not realized.
The dual-frequency circularly polarized antenna proposed by the Chinese invention patent 'CN 102931476B,2015, 2015.02.11' adopts a single-feed mode, and works at 1.575GHz and 2.35GHz by exciting two double-layer radiation patches with different resonant frequencies, and realizes right-hand circular polarization in a low frequency band and left-hand circular polarization in a high frequency band. Although the antenna realizes the alternation of circular polarization rotation directions on two frequency bands, the two frequency bands have larger interval and adopt a multilayer structure, which is more complicated.
A novel compact triple-band microstrip feed monopole antenna with dual polarization characteristics is proposed in the document "Tri-band microstrip-fed monopole antenna with dual-polarization characteristics for WLAN and WiMAX applications (Ting Wu; xiao-Wei Shi; ping Li; hao Bai, electronics Letters,2013,49 (25): 1597-1598)". The antenna consists of a ground, two unequal monopole arms and a Y-shaped radiation patch consisting of an improved circular monopole and works in three frequency bands of WLAN (2.4 GHz-2.484GHz and 5.8 GHz) and WiMAX (3.4 GHz-3.7 GHz). Although the antenna is circularly polarized in both WLAN bands, its circular polarization handedness is the same, and is linearly polarized in the 3.4GHz-3.7GHz band.
The document "Triple Band circular Polarized Printed Crossed amplified digital amplification interference amplifiers (Aditya Singh; debdepSarkar, kushmanda Saurav, kumar Vaibhav Srivastava, IEEE UP Section Conference on electric Computer and Electronics,2016 (1-5)", a three-frequency Circularly Polarized Printed cross-Dipole Antenna whose circular polarization is achieved by feeding orthogonal Dipole arms with a 90 phase difference through a hollowed-out quarter-wave Printed loop. The antenna can work on three frequency bands of 1.37GHz-1.45GHz, 1.53GHz-2.00GHz and 2.04GHz-2.21GHz, but the three frequency bands are right-hand circular polarization with the same rotation direction.
From the existing reports at present, characteristics of a feed network or an antenna are generally changed by introducing a varactor diode or a PIN switch tube, and then left-right circular polarization is changed, but such an antenna usually works on a single frequency, and although there is a case of realizing multi-frequency circular polarization, the design of the antenna is generally complex and the frequency band interval is large. Therefore, how to design a reconfigurable antenna which has a simple structure, can work in an adjacent frequency band, and can realize the sequential alternation of left-handed and right-handed circular polarization is a challenging important subject in the microwave engineering.
Disclosure of Invention
The invention aims to solve the technical problem of providing a multi-frequency left-right circular polarization reconfigurable antenna with a simple structure, wherein the circularly polarized antenna can realize the sequential alternate work of left-right circular polarization in a plurality of adjacent frequency bands.
Around the technical problem to be solved, the technical scheme adopted by the invention is as follows:
a multi-frequency left-right rotation circular polarization reconfigurable antenna is structurally shown in figure 1 and comprises a one-to-two power divider 1, a +/-90-degree phase-shifting transmission line 2 and a dual-port cross-feed circular polarization antenna 3; the one-to-two power divider is used for dividing power equally; the +/-90-degree phase-shifting transmission line comprises two transmission lines with different lengths, which are respectively marked as a long transmission line and a short transmission line, the short transmission line is formed by connecting a first short transmission line and a second short transmission line in series, an open-circuit branch and a short-circuit branch which have the same length are loaded between the first short transmission line and the second short transmission line in parallel, and the sum of the lengths of the open-circuit branch and the short-circuit branch is equal to the difference between the length of the long transmission line and the sum of the lengths of the two short transmission lines; one end of the long transmission line and one end of the short transmission line are respectively connected with two output ends of the one-to-two power divider 1; the one-to-two power divider and the +/-90-degree phase-shifting transmission line form a feed network of the multi-frequency left-right-handed circular polarization reconfigurable antenna; the ends of the long transmission line and the short transmission line far away from the one-to-two power divider are output ends of the feed network, and the two ends are respectively connected with two ports of the circularly polarized antenna 3.
Furthermore, the characteristic impedances of the long transmission line, the short transmission line, the open-circuit branch and the short-circuit branch are the same.
Furthermore, the one-to-two power divider is a Wilkinson power divider, and a quarter wavelength transmission line of the one-to-two power divider can adopt a coupling structure.
The invention also provides a design method for realizing the multi-frequency left-right-handed circular polarization reconfigurable antenna feed network, which comprises the following steps:
step a: determining n central frequencies of each working frequency band of the multi-frequency circularly polarized antenna, and sequentially marking as f from small to large 1 、f 2 、f 3 ……f n Wherein the difference between adjacent center frequencies is equal, i.e.
f n -f n-1 ＝f n-1 -f n-2 ＝......＝f 2 -f 1 (1)
Recording the integral center frequency of the multi-frequency circularly polarized antenna as f 0 ＝(f 1 +f 2 +f 3 +……f n )/n；
Step b: at the overall center frequency f determined in step a 0 Designing the one-to-two power divider for the working frequency;
step c: determining parameters of the +/-90-degree phase-shifting transmission line, including working frequencies, characteristic impedances and electrical lengths of the long transmission line, the short transmission line, the open-circuit branch and the short-circuit branch; the characteristic impedances of the long transmission line, the short transmission line, the open-circuit branch and the short-circuit branch are all Z 0 =50 ohms; the electrical lengths of the open-circuit branch and the short-circuit branch are recorded as theta, and the electrical length theta and the corresponding working frequency f meet the following conditions:
wherein k is:
the difference between the electrical lengths of the long transmission line and the short transmission line is theta d The following relationship is satisfied: theta d ＝2θ；
Step d: further, the designed one-to-two power divider and the +/-90-degree phase-shifting transmission line are sequentially cascaded, so that a feed network of the multi-frequency left-right-handed circular polarization reconfigurable antenna is formed.
Further, the electrical length θ is 90 degrees, i.e., π/2.
After the design, the characteristics of the whole feed network are as follows: at f i Near the frequency (i =2,3,4, \ 8230;, n-1), the phase difference between the two output ports of the feed network is ± 90 degrees, and the phase difference on the adjacent frequency bands is opposite (i.e. f;) to each other n The phase difference is +90 degrees, then f n-1 And f n+1 The phase difference is-90 degrees) and the magnitude imbalance is less than 0.5dB. Therefore, after the dual-port orthogonal feed circularly polarized antenna is accessed to the feed network, the reconfigurable function of multi-frequency left-right rotation circular polarization can be realized.
The invention has the advantages that: the invention provides a multi-frequency left-right rotation circular polarization reconfigurable antenna, which can realize the sequential alternate work of left-right rotation circular polarization on a plurality of adjacent frequency bands, and the central frequency ratio f of the adjacent frequency bands n+1 :f n Can be controlled within 1.1. Furthermore, by introducing switch switching, the reconfigurable left-right circular polarization of the antenna can be realized on a plurality of adjacent frequency bands. Compared with other reconfigurable circularly polarized antennas, the reconfigurable circularly polarized antenna is simple in structure, multi-band and close in proximity. Based on the technical scheme and the implementation structure provided by the invention, the anti-interference capability of the multifunctional communication system can be effectively improved.
Drawings
Fig. 1 is a schematic diagram of a multi-frequency left-right-handed circular polarization reconfigurable antenna provided by the invention.
Fig. 2 is a structural diagram of a multi-frequency left-right rotation circular polarization reconfigurable antenna feed network provided by an embodiment of the present invention.
Fig. 3 shows transmission characteristics of a multi-frequency left-right-hand circular polarization reconfigurable antenna feed network according to an embodiment of the present invention.
Fig. 4 shows a phase difference between two output ports of the multi-frequency left-right-handed circular polarization reconfigurable antenna feed network provided by the embodiment of the present invention.
Fig. 5 is a structural diagram of a multi-frequency left-right-handed circular polarization reconfigurable antenna provided by an embodiment of the present invention.
Fig. 6 shows return loss characteristics of the multi-frequency left-right-handed circular polarization reconfigurable antenna provided by the embodiment of the invention.
Fig. 7 shows the axial ratio performance of the multi-frequency left-right-handed circular polarization reconfigurable antenna provided by the embodiment of the invention.
Fig. 8 shows a gain pattern (right-hand circular polarization) of the multi-frequency left-right-hand circular polarization reconfigurable antenna at 0.55 GHz.
Fig. 9 shows a gain pattern (left-hand circular polarization) of the multi-frequency left-right-hand circular polarization reconfigurable antenna at 0.65 GHz.
Fig. 10 shows a gain pattern (right-hand circular polarization) of the multi-frequency left-right-hand circular polarization reconfigurable antenna at 0.75 GHz.
Fig. 11 shows a gain pattern (left-hand circular polarization) of the multi-frequency left-right-hand circular polarization reconfigurable antenna at 0.85 GHz.
Fig. 12 shows a gain pattern (right-hand circular polarization) of the multi-frequency left-right-hand circular polarization reconfigurable antenna at 0.96 GHz.
Fig. 13 shows a gain pattern (left-hand circular polarization) of the multi-frequency left-right-hand circular polarization reconfigurable antenna at 1.03 GHz.
Fig. 14 shows a gain pattern (right-hand circular polarization) of the multi-frequency left-right-hand circular polarization reconfigurable antenna at 1.14 GHz.
Detailed Description
Fig. 1 is a schematic diagram of a multi-frequency left-right-handed circular polarization reconfigurable antenna provided by the invention. The two-in-one Wilkinson equipower divider 1, a +/-90-degree phase-shifting transmission line 2 and a dual-port quadrature feed circularly polarized antenna 3.
In the embodiment, the one-to-two Wilkinson equipower divider and the +/-90-degree phase-shifting transmission line both adopt microstrip line structures, the thickness of the dielectric substrate is 1mm, and the relative dielectric constant epsilon of the dielectric substrate is r =2.65, and the central operating frequencies are 0.55GHz, 0.65GHz, 0.75GHz, 0.85GHz, 0.95GHz, 1.05GHz, and 1.15GHz, respectively, in seven.
Fig. 2 is a structural diagram of a multi-frequency left-right rotation circular polarization reconfigurable antenna feed network provided by an embodiment of the invention. The whole feed network comprises a one-to-two Wilkinson equipower divider and a +/-90-degree phase-shifting transmission line, wherein a port 1 is an input port, and a port 2 and a port 3 are output ports.
In this embodiment, the center frequency of the one-to-two Wilkinson power divider is 0.85GHz, the length of the quarter-wavelength transmission line 4 of the coupling structure is 57mm, the width of the quarter-wavelength transmission line is 2mm, and the resistance of the isolation resistor 5 is 100 Ω.
According to the formula (3), the value of k in this embodiment is 0.417, and meanwhile, the electrical lengths θ of the open-circuit branch and the short-circuit branch in this embodiment are both set to be pi/2, and then the operating frequency f =100MHz corresponding to the open-circuit branch and the short-circuit branch can be obtained according to the formula (2), so that the final parameter of the ± 90-degree phase-shifting transmission line is determined as follows: the length of the long transmission line 6 is 1185mm, the length of the short transmission line 7 is 171mm, the length of the open-circuit branch 8 is 509.3mm, and the length of the short-circuit branch 9 is 508.6mm. In addition, the characteristic impedances of the +/-90-degree phase-shifting transmission line and the one-to-two Wilkinson equipower divider input section transmission line are both 50 omega, and the corresponding microstrip line width is 2.7mm in the embodiment.
Fig. 3 is scattering parameters of the multi-frequency left-right rotation circular polarization reconfigurable antenna feed network provided in this embodiment. It can be seen from the figure that after power distribution of the power divider such as one-to-two Wilkinson, the amplitude of the output of the port 2 in the range of 0.5GHz to 1.2GHz is about-3.5 dB, but the short transmission line of the port 3 is loaded with the open-circuit branch and the short-circuit branch in parallel, so that the output of the port is at 0.55GHz, 0.65GHz and 0 GHz.The amplitudes of the frequency ranges of about 75GHz, 0.85GHz, 0.95GHz, 1.05GHz and 1.15GHz reach-3.5 dB, namely, the port 2 and the port 3 realize equal power division on the frequencies. In addition, S is near 0.55GHz 21 And S 31 The bandwidth with the amplitude unbalance degree less than 0.5dB is 10MHz and is close to 0.65GHz 21 And S 31 The bandwidth with the amplitude unbalance degree less than 0.5dB is 15MHz and is S around 0.75GHz 21 And S 31 The bandwidth with the amplitude imbalance degree less than 0.5dB is 10MHz, and S is near 0.85GHz 21 And S 31 The bandwidth with the amplitude imbalance degree less than 0.5dB is 20MHz, and S is near 0.95GHz 21 And S 31 The bandwidth with the amplitude imbalance degree less than 0.5dB is 10MHz, and S is near 1.05GHz 21 And S 31 The bandwidth with the amplitude unbalance degree less than 0.5dB is 20MHz and is S around 1.15GHz 21 And S 31 The bandwidth with an amplitude imbalance of less than 0.5dB is 15MHz.
Fig. 4 is a phase difference between ports 2 and 3 of the multi-frequency left-right-handed circular polarization reconfigurable antenna feed network provided in this embodiment. As can be seen from the figure, the phase difference between the two ports is 285 degrees (i.e., -75 degrees) at 0.55GHz, the phase difference between the two ports is 460 degrees (i.e., -100 degrees) at 0.65GHz, the phase difference between the two ports is 635 degrees (i.e., -95 degrees) at 0.75GHz, the phase difference between the two ports is 812 degrees (i.e., 92 degrees) at 0.85GHz, the phase difference between the two ports is 991 degrees (i.e., -91 degrees) at 0.95GHz, the phase difference between the two ports is 1173 degrees (i.e., 93) at 1.05GHz, and the phase difference between the two ports is 1364 degrees (i.e., -104 degrees) at 1.15GHz, thereby achieving seven adjacent frequencies of the output port of the feeding network ranging from 0.65GHz to 1.15GHz, the phase differences of which alternate in turn within a certain bandwidth between-90 degrees and +90 degrees.
Fig. 5 is a structural diagram of the multi-frequency left-right circular polarization reconfigurable antenna provided in this embodiment. In this embodiment, a monopole with dual-port orthogonal feed is used as a circularly polarized antenna, and a square dashed box in the figure represents a portion of the lower metal floor that is etched away. The monopole in the antenna is circular-arc, and two monopoles are the same in size and are placed in mirror symmetry with respect to the diagonal of a square broken line frame. It should be noted that: the invention is not limited to a monopole type circular polarization antenna, and can also be other types of dual-port orthogonal feed circular polarization antennas such as a microstrip patch antenna and the like.
Fig. 6 is return loss characteristics of the multi-frequency left-right-hand circular polarization reconfigurable antenna provided in this embodiment. Fig. 7 shows the axial ratio performance of the multi-frequency left-right-handed circular polarization reconfigurable antenna provided by this embodiment. As shown in fig. 6 and 7, the impedance bandwidth of the antenna at 0.55GHz is 70MHz (see | S) 11 |&-10dB, the same below), the 3-dB axial ratio bandwidth is 20MHz, the impedance bandwidth at 0.65GHz is 20MHz, the 3-dB axial ratio bandwidth is 40MHz, the impedance bandwidth at 0.75GHz is 40MHz, the 3-dB axial ratio bandwidth is 30MHz, the impedance bandwidth at 0.85GHz is 50MHz, the 3-dB axial ratio bandwidth is 20MHz, the impedance bandwidth at 0.95GHz is 30MHz, the 3-dB axial ratio bandwidth is 25MHz, the impedance bandwidth at 1.05GHz is 50MHz, the 3-dB axial ratio bandwidth is 20MHz, the impedance bandwidth at 1.15GHz is 80MHz, and the 3-dB axial ratio bandwidth is 20MHz.
Fig. 8, 9, 10, 11, 12, 13, and 14 show the gain pattern (right circular polarization) at 0.55GHz, the gain pattern (left circular polarization) at 0.65GHz, the gain pattern (right circular polarization) at 0.75GHz, the gain pattern (left circular polarization) at 0.85GHz, the gain pattern (right circular polarization) at 0.96GHz, the gain pattern (left circular polarization) at 1.03GHz, and the gain pattern (right circular polarization) at 1.14GHz, respectively, of the multi-band left-right circular polarization reconfigurable antenna provided in this embodiment. Comparing the results of several figures, it can be seen that the maximum radiation directions of the circularly polarized gain patterns are the same in these frequency bands, but the circularly polarized handedness thereof is different, so that the circularly polarized antenna can be implemented in a plurality of adjacent frequency bands, such as 0.55GHz, 0.65GHz, 0.75GHz, 0.85GHz, 0.96GHz, 1.03GHz, and 1.14GHz, which are operated in the frequency bands and the circularly polarized handedness of these frequency bands is sequentially alternated. Furthermore, the reconfigurable function of the antenna for sequentially and alternately switching the left-handed circular polarization rotation direction and the right-handed circular polarization rotation direction on a plurality of adjacent frequency bands can be realized by switching the connection of the two output ports of the feed network and the two ports of the antenna through a switch.
The above description is only an example of the present invention and is not intended to limit the present invention, and any modification, equivalent change and modification made by the technical spirit of the present invention by those skilled in the art without departing from the scope of the present invention will still fall within the protection scope of the present invention.
Claims (5)
1. A multi-frequency left-right rotation circular polarization reconfigurable antenna comprises a one-to-two power divider (1), a +/-90-degree phase-shifting transmission line (2) and a dual-port orthogonal feed circular polarization antenna (3); the one-to-two power divider (1) is used for dividing power equally; the +/-90-degree phase-shifting transmission line (2) comprises two transmission lines with different lengths, which are respectively marked as a long transmission line and a short transmission line, the short transmission line is formed by connecting a first short transmission line and a second short transmission line in series, an open-circuit branch and a short-circuit branch which are the same in length are loaded between the first short transmission line and the second short transmission line in parallel, and the sum of the lengths of the open-circuit branch and the short-circuit branch is equal to the difference between the length of the long transmission line and the sum of the lengths of the two short transmission lines; one end of the long transmission line and one end of the short transmission line are respectively connected with two output ends of the one-to-two power divider (1); the one-to-two power divider and the +/-90-degree phase-shifting transmission line form a feed network of the multi-frequency left-right-handed circular polarization reconfigurable antenna; one ends of the long transmission line and the short transmission line, which are far away from the one-to-two power divider, are output ends of the feed network, and the long transmission line and the short transmission line are respectively connected with two ports of the circularly polarized antenna (3).
2. The multi-frequency left-right-handed circular polarization reconfigurable antenna of claim 1, wherein the characteristic impedances of the long transmission line, the short transmission line, the open-circuit branch and the short-circuit branch are the same.
3. The multi-frequency left-right-handed circular polarization reconfigurable antenna according to claim 1, wherein the one-to-two power divider is a Wilkinson power divider, and a quarter-wavelength transmission line of the one-to-two power divider adopts a coupling structure.
4. The multi-frequency left-right-handed circularly polarized reconfigurable antenna of claim 1, wherein the electrical lengths of the open-circuit branches and the short-circuit branches are both 90 degrees.
5. A method for designing a multi-frequency left-right-hand circular polarization reconfigurable antenna according to claim 1, comprising the steps of:
step a: determining n central frequencies of each working frequency band of the multi-frequency circularly polarized antenna, and sequentially marking as f from small to big 1 、f 2 、f 3 ……f n Wherein the difference between adjacent center frequencies is equal, i.e.
f n -f n-1 ＝f n-1 -f n-2 ＝......＝f 2 -f 1 (1)
Note that the overall center frequency of the multi-band circularly polarized antenna is f 0 ＝(f 1 +f 2 +f 3 +……f n )/n；
Step b: at the overall center frequency f determined in step a 0 Designing the one-to-two power divider for the working frequency;
step c: determining parameters of the +/-90-degree phase-shifting transmission line, including working frequencies, characteristic impedances and electrical lengths of the long transmission line, the short transmission line, the open-circuit branch and the short-circuit branch; the characteristic impedances of the long transmission line, the short transmission line, the open-circuit branch and the short-circuit branch are all Z 0 =50 ohms; the electrical lengths of the open-circuit branch and the short-circuit branch are recorded as theta, and the electrical length theta and the corresponding working frequency f meet the following conditions:
wherein k is:
the difference between the electrical lengths of the long transmission line and the short transmission line is theta d The following relationship is satisfied: theta.theta. d ＝2θ；
Step d: further, the designed one-to-two power divider and the +/-90-degree phase-shifting transmission line are sequentially cascaded, so that a feed network of the multi-frequency left-right-handed circular polarization reconfigurable antenna is formed.
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| CN108832246A (en) * | 2018-06-15 | 2018-11-16 | 南通大学 | A kind of four phase power splitters |
| CN108963470A (en) * | 2018-06-27 | 2018-12-07 | 南通大学 | A kind of antenna array feeding network |
| CN110277620A (en) * | 2019-05-27 | 2019-09-24 | 西安空间无线电技术研究所 | A kind of tracery type butler matrix and its design method |
| CN110783701A (en) * | 2019-09-25 | 2020-02-11 | 西安电子科技大学 | Circular polarization reconfigurable antenna integrated with adjustable phase-shifting power divider |
| CN111129731A (en) * | 2020-02-10 | 2020-05-08 | 西安电子科技大学昆山创新研究院 | Novel dual-port feed four-frequency-band filtering duplex antenna |
| CN112653502A (en) * | 2020-12-17 | 2021-04-13 | 东方红卫星移动通信有限公司 | Portable terminal radio frequency channel based on frequency coordination |
| CN115498386A (en) * | 2022-09-26 | 2022-12-20 | 昆山立讯射频科技有限公司 | Power divider |
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| US20100260076A1 (en) * | 2009-04-13 | 2010-10-14 | Viasat, Inc. | Half-Duplex Phased Array Antenna System |
| CN103730734A (en) * | 2014-01-15 | 2014-04-16 | 哈尔滨工业大学 | Double-circular-polarization patch antenna for power divider feed |
| EP3189558A1 (en) * | 2014-09-05 | 2017-07-12 | Smart Antenna Technologies Ltd | Reconfigurable multi-band antenna with independent control |
| CN104393389A (en) * | 2014-11-14 | 2015-03-04 | 电子科技大学 | Broadband phase shifting power divider with amplitude and phase compensating function |
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| CN108832246B (en) * | 2018-06-15 | 2021-01-01 | 南通大学 | Four-phase power divider |
| CN108963470A (en) * | 2018-06-27 | 2018-12-07 | 南通大学 | A kind of antenna array feeding network |
| CN110277620A (en) * | 2019-05-27 | 2019-09-24 | 西安空间无线电技术研究所 | A kind of tracery type butler matrix and its design method |
| CN110783701A (en) * | 2019-09-25 | 2020-02-11 | 西安电子科技大学 | Circular polarization reconfigurable antenna integrated with adjustable phase-shifting power divider |
| CN111129731A (en) * | 2020-02-10 | 2020-05-08 | 西安电子科技大学昆山创新研究院 | Novel dual-port feed four-frequency-band filtering duplex antenna |
| CN111129731B (en) * | 2020-02-10 | 2022-03-29 | 西安电子科技大学昆山创新研究院 | Novel dual-port feed four-frequency-band filtering duplex antenna |
| CN112653502A (en) * | 2020-12-17 | 2021-04-13 | 东方红卫星移动通信有限公司 | Portable terminal radio frequency channel based on frequency coordination |
| CN115498386A (en) * | 2022-09-26 | 2022-12-20 | 昆山立讯射频科技有限公司 | Power divider |
| CN115498386B (en) * | 2022-09-26 | 2024-01-26 | 苏州立讯技术有限公司 | Power divider |
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