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In this paper, a compact triple-narrowband bandpass filter is designed and proposed using microstrip resonators. The proposed triple-band BPF consists of two half-wave resonators in combination with a simple anti-parallel coupled lines which realizes a triple-band BPF with a size reduction about 42% in comparison with the conventional one. Additionally,(More)
An adjustable output power ratio branch line coupler design is proposed. The mixed transmission line and shunted capacitor T-type equivalent circuit replaced the arms of the general branch line forms the tuning mechanism. By changing the shunted capacitors values, the power at output ports could shift to the desired ratio. A prototype circuit designed at(More)
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