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Abstract:In this article, a compact branch-line hybrid coupler (BLC) which can suppress upper order harmonics of the conventional BLC is proposed. By adding a radial stub in the center of each branch, a compact BLC which can suppress the upper order harmonics are achieved. The proposed BLC is designed and simulated at 0.93 GHz. The proposed structure is 27% of the conventional BLC, while maintaining the characteristics of the conventional BLC at the center frequency. There are two transmission zeroes at 3.6 and 5.6 GHz. The third upto seventh harmonic are suppressed at least 20 dB. Keywords: branch-line hybrid coupler, compact size, harmonic suppression, microstrip transmission line, radial stub Classification: Microwave and millimeter wave devices, circuits, and systems References[1] S. Jung, R. Negra, and F. M. Ghannouchi, "A design methodology for miniaturized 3-db branch-line hybrid couplers using distributed capacitors printed in the inner area," IEEE Trans.

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