A Broadband Dual-Frequency Coupler
A coupler and broadband technology, applied in the field of multi-frequency couplers, can solve the problems of uncontrollable coupling, not easy to cascade, small frequency ratio, etc., and achieve the effect of convenient port location, short electrical length, and large frequency ratio.
Active Publication Date: 2021-09-21
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS +1
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Problems solved by technology
[0008] Aiming at the defects existing in the existing dual-frequency coupler technology, the present invention proposes a dual-frequency coupler and a broadband dual-frequency coupler based on symmetrical ladder impedance parallel coupling lines to solve the problems of uncontrollable coupling degree, small frequency ratio, and volume Big, difficult to cascade, narrow bandwidth and other issues
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[0024] The circuit structure and principle of the present invention will be further described below.
[0025] figure 1 The circuit topology diagram of the symmetrical ladder impedance parallel line coupler is given. The symmetrical ladder impedance parallel coupled line is formed by cascading three parallel coupled lines, and the circuit from left to right presents symmetry. The odd-mode and coupling characteristic impedances and electrical lengths of the first and third parallel coupled lines are respectively Z 0o1 ,Z 0e1 , θ 1 , the odd-mode and coupling characteristic impedance and electrical length of the second parallel coupled line are Z 0o2 ,Z 0e2 , θ 2 .
[0026] In order to realize a dual-frequency coupler with a frequency ratio of m and a voltage coupling coefficient of k, the odd and even mode equivalent circuits of the parallel coupled lines with symmetrical step impedance should be equivalent to the frequency ratio of m and the k value of Z o and Z e The ...
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The invention discloses a dual-frequency coupler and a broadband dual-frequency coupler, belonging to the field of multi-frequency couplers. Among them, the dual-frequency coupler and the broadband dual-frequency coupler are composed of one or more parallel coupling lines with symmetrical step impedance. The symmetrical ladder impedance parallel coupled line is formed by cascading three parallel coupled lines; wherein the first section and the last section have the same electrical length and odd-even mode characteristic impedance, the middle section has different odd-even mode characteristic impedance, and the middle section has the same electrical length and odd-even mode characteristic impedance. The length may be equal to or not equal to the electrical length of the first segment, and the total electrical length of the three segments is less than or equal to a quarter wavelength at the lower working frequency band. The dual-frequency coupler based on the symmetrical ladder impedance parallel coupling line and the broadband dual-frequency coupler realize the adjustable frequency ratio, and it is easy to obtain a large frequency ratio; any coupling coefficient, small volume, and the structure is easy to cascade And achieve broadband characteristics and obtain multi-octave bandwidth in the low frequency band.
Description
technical field [0001] The invention relates to the field of multifrequency couplers. Background technique [0002] With the rapid development of wireless communication systems, various communication standards continue to emerge, such as GSM, DCS, TD-SCDMA, WCDMA, CDMA2000, TD-LTE and so on. In order to reduce the size of base stations and mobile terminals and improve radio frequency performance, the development of multi-frequency and multi-mode radio frequency systems has attracted attention. Corresponding to this trend, the development of multi-frequency microwave components is particularly important. [0003] The dual-frequency coupler is used to construct a variety of dual-frequency circuits and systems, and can be applied to two different operating frequency bands. It has the advantages of simple structure, arbitrary coupling degree and small size. [0004] Traditional couplers are divided into branch line couplers, hybrid ring couplers and parallel line (ie, coupled ...
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IPC IPC(8): H01P1/213
CPCH01P1/213
Inventor 刘云蒋帅朱爽吴永乐
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS