Affiliation:
1. College of Integrated Circuits and Optoelectronic Chips Shenzhen Technology University Shenzhen China
2. Guangxi Key Laboratory of Wireless Wideband Communication and Signal Processing, School of Information and Communication Guilin University of Electronic and Technology Guilin China
3. Guangdong Provincial Key Laboratory of Millimeter‐Wave and Terahertz School of Electronic and Information Engineering South China University of Technology Guangzhou China
Abstract
AbstractIn this paper, a new 180° broadband phase shifter with coupled microstrip line with enhanced coupling by etched slots is proposed, which uses the energy coupling between the parallel‐coupled microstrip lines on the upper layer of the dielectric substrate and the etched rectangular slots (RS) structure on the bottom floor to circumvent the problem for achieving wide operating broadband and low insertion loss with compact size and simple structure. First, the main line and the reference line of the proposed phase shifter are composed of two parallel coupled lines and a uniform transmission line, respectively. Then, its working mechanism is described. Afterward, the phase shifter introduced an RS structure to increase the coupling strength, achieving a broadband of 69.7% and very low insertion loss (0.09 dB) with a phase shift of 180 ± 5°. Finally, a prototype 180° phase shifter with a center frequency of 3.0 GHz was designed, fabricated, and measured, and the measured results are good in agreement with the simulated ones.