Arbitrarily Dual-Band Components Using Simplified Structures of Conventional CRLH TLs.

Microwave components with nonlinear phase responses are developed using a simplified composite right/left-handed (CRLH) transmission-line (TL) structure without the series capacitance or the shunt inductance. Using such a simplified CRLH structure, arbitrarily dual-band microstrip components have been realized in compact sizes such as a quarter-wavelength short-circuited stub and dual-band branch-line couplers. Simulation and measurement results are given to demonstrate the efficiency and good performance of the proposed components. For the quarter-wavelength short-circuited stub based on the simplified CRLH-TL structure without the series capacitance, it has been shown that the insertion loss is less than -0.1 dB. For the arbitrarily dual-band branch-line coupler, experiment results exhibit that $₂₁ and $₃₁ are larger than -3.6 dB, the isolations are smaller than -30 dB, the return losses are smaller than -20 dB, and the phase differences are within 90° ± 1.8°. [ABSTRACT FROM AUTHOR]