Open AccessCompact ultra‐wideband 90° phase shifter using short‐circuited stub and weak coupled line
Author(s) -
Liu Qiang,
Liu Hongli,
Liu Yuanan
Publication year - 2014
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
ISSN - 1350-911X
DOI - 10.1049/el.2014.2271
Subject(s) - phase shift module , wideband , stub (electronics) , insertion loss , bandwidth (computing) , return loss , materials science , electronic engineering , optoelectronics , electrical engineering , computer science , engineering , telecommunications , antenna (radio)
A compact ultra‐wideband 90° phase shifter based on a short‐circuited stub and a weak coupled line (WCL) is proposed. The circuit conguration and derivation of S ‐parameters and phase difference are presented. The analysis result indicates that the phase deviation (PD) bandwidth can be extended to 200% by adjusting the coupling coefficient of the WCL. The fabricated phase shifter exhibits a bandwidth of 118% from 0.66 to 2.56 GHz for return loss >10 dB, insertion loss (IL) <0.5 dB and a PD of ±3.9°. Comparison shows that the proposed phase shifter not only has the most compact size with single‐layer structures but also achieves the largest bandwidth and lowest IL. The design features low‐cost, good design portability and convenient installation. Thus it is a good candidate for wideband and ultra‐wideband applications.