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A novel edge-coupled symmetric coupled-line coupler featuring the quasi-0-dB couplings at adjacently dual frequencies is presented based on the composite right/left-handed (CRLH) transmission lines. The fulfillment of dual-frequency quasi-0-dB couplings is derived from the complete backward and complete forward coupling phenomena at the higher and lower operating frequencies, respectively. To this...
The paper presents analytical design methodology for realizing dual-band phase offset line using multi-section coupled lines. The circuit is designed to emulate a transmission line of 50 Ω characteristic impedance with two different arbitrary phases at the two frequencies. A prototype has been design at 1960 /3500 MHz that is used in dual-band Doherty power amplifier operating for CDMA and WiMAX applications.
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