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Ring-balun-bandpass filter with harmonic suppression

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2 Author(s)
Kang, S.-J. ; Dept. of Electr. & Electron. Eng., Kangwon Nat. Univ., Chuncheon, South Korea ; Hwang, H.-Y.

The Y-matrix of a three-port dual-mode ring resonator for a balun-bandpass filter (BPF) application is derived. Using Y parameters, it is verified that the structure theoretically satisfies the general balun conditions. The admittance slope parameters of the dual-mode ring resonator with one terminated port are derived so that one can design balun-BPFs using the conventional standard BPF design procedure. The proposed equations are validated by designing a balun-BPF. Inverters are then substituted with low-pass filter unit cells of λ/4 electrical length to suppress harmonics from the second to the fourth. The experimental measurements show good agreement with theoretical and electromagnetic-simulated predictions and suppressed harmonics below λ30λdB up to fourth-order harmonics.

Published in:

Microwaves, Antennas & Propagation, IET  (Volume:4 ,  Issue: 11 )