June 22, 2024
Abbas Rezaei

Abbas Rezaei

Academic rank: Assistant professor
Address:
Education: Ph.D in Electrical engineering
Phone: 083-38305001
Faculty: Faculty ofٍٍ Electrical Engineering

Research

Title
Miniaturized Planar Crossover Using Microstrip Stub Loaded Coupled Lines
Type Article
Keywords
Compact size, coupled lines, crossover, isolation, microstrip, phase analysis
Researchers Abbas Rezaei، leila noori

Abstract

A novel symmetrical planar crossover is presented in this paper. The proposed resonator consists of coupled lines loaded by U-shape stubs, which two similar of them are integrated to create two passband paths at 2.09 GHz for wireless communication systems. To analyze the proposed structure a LC equivalent circuit is proposed for the coupled lines then the resonance condition is obtained. The isolation between two channels is well improved so that S21, S41 and S32 are −29.9, −26.59 and −26.4 dB at 2.09 GHz. Meanwhile, 0.57 dB insertion loss and a compact size of 0.202λg×0.208λg (21.6×22.2 mm2) are obtained where λg is the guided wavelength calculated at the resonance frequency. Also, a phase analysis is done that shows exactly 0° phase shift between two paths (S31 and S42) at the resonance frequency. To verify the introduced methodology, the designed crossover is fabricated and measured. There is a good agreement between the simulated and measured results.