A compact branch-line coupler design using low-pass resonators and meandered lines open stubs

Authors: FATEMEH HOSSEINKHANI, SAEED ROSHANI

Abstract: A compact 1.5 GHz microstrip branch-line coupler with harmonic suppression, using low-pass resonators and meandered lines open stubs, is designed and fabricated in this paper. Both significant size reduction and harmonics suppression are achieved in the proposed structure using U-shape low-pass resonators and meandered lines open stubs. The proposed coupler shows more than 24 dB suppression for harmonics (2nd up to 10th). The proposed coupler size has been reduced by almost up to 81{\%} compared to the typical one. The designed coupler is simulated using Advanced Design System software. The measured results verify the simulation data of the designed coupler.

Keywords: Branch-line coupler, harmonic suppression, microstrip, resonators, size reduction

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