광대역 고조파 감쇠특성을 갖는 소형화된 링-하이브리드의 설계

A Design of Miniaturized Ring-Hybrid Coupler with Broadband Harmonic Attenuation Property

Folded lines are applied to design a compact microstrip ring hybrid. Using the proposed structure we achieve both significant size reduction and good harmonic suppression with the same results of conventional ring hybrid at 2.41GHz. Including the third harmonic frequency, up to 11GHz band harmonics are suppressed to -20dB. The size of the proposed ring-hybrid is reduced to one forth of the conventional ring hybrid. The measured frequency responses agree well with simulated ones.