Dual-frequency coupler and broadband dual-frequency coupler based on symmetric stepped impedance parallel coupled line
A parallel coupling line, stepped impedance technology, applied in the field of multi-frequency couplers, can solve the problems of uncontrollable coupling, difficult to cascade, small frequency ratio, etc., and achieve the effect of convenient port location, short electrical length, and large frequency ratio.
Active Publication Date: 2018-03-20
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 sections of 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 a...
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The invention discloses a dual-frequency coupler and a broadband dual-frequency coupler, and belongs to the field of multi-frequency couplers. The dual-frequency coupler and the broadband dual-frequency coupler are formed by one or more sections of a symmetric stepped impedance parallel coupled line. The symmetric stepped impedance parallel coupled line is formed by cascading three segments of a parallel coupled line, wherein the front segment and the tail segment are the same in electrical length and odd-even mode characteristic impedance, the middle segment has different odd-even mode characteristic impedance, the electrical length of the middle segment can be equal to or not equal to the electrical length of the front segment, and the total electrical length of the three segments is less than or equal to a quarter of the wavelength at a low operating frequency band. The dual-frequency coupler and the broadband dual-frequency coupler based on the symmetric stepped impedance parallelcoupled line achieve an adjustable frequency ratio and are easy to acquire a high frequency ratio, an arbitrary coupling coefficient and a small size. Meanwhile, the structure is easy to be cascaded and achieve broadband characteristics and acquires multi-time frequency bandwidth in a 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