عباس رضایی

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.