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- Title
Microstrip stepped-impedance ring all-pass filter and wideband 90° phase shifter.
- Authors
Jin, Xiu‐Hua; Huang, Xiao‐Dong; Cheng, Chong‐Hu
- Abstract
ABSTRACT A new all-pass filter (APF) is proposed. The APF is based on a symmetrical ring, consisting of four sections of transmission line, which are identical in electrical length, different in characteristic impedance. Two input/output ports are connected orthogonally to the ring. The APF is analyzed by using the odd-even model, and the all-pass condition is then theoretically obtained. Meeting the condition, the circuit is all-pass in frequency, but nonlinear in transmission phase. The nonlinear transmission phase with frequency may be adjusted by changing the lines' impedances, while remaining the all-pass property. Then the APF is used to design a wideband 90° differential phase shifter with adjustable bandwidth. Samples are designed, fabricated and measured. Good agreements are achieved among the theoretic, numerical and experimental results. © 2013 Wiley Periodicals, Inc. Int J RF and Microwave CAE 24:191-195, 2014.
- Subjects
MICROSTRIP antennas; BANDPASS filters; PHASE shifters; RADIO lines; FABRICATION (Manufacturing); BANDWIDTHS
- Publication
International Journal of RF & Microwave Computer-Aided Engineering, 2014, Vol 24, Issue 2, p191
- ISSN
1096-4290
- Publication type
Article
- DOI
10.1002/mmce.20748