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Arbitrarily dual-band components using simplified structures of conventional CRLH TLs

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7 Author(s)
Xian Qi Lin ; State Key Lab. of Millimeter Waves, Southeast Univ., Hangzhou, China ; Ruo Peng Liu ; Xin Mi Yang ; Ji Xin Chen
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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 -0.1dB. For the arbitrarily dual-band branch-line coupler, experiment results exhibit that S21 and S31 are larger than -3.6dB, the isolations are smaller than -30dB, the return losses are smaller than -20dB, and the phase differences are within 90°±1.8°.

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Microwave Theory and Techniques, IEEE Transactions on  (Volume:54 ,  Issue: 7 )