Novel Compact Branch-Line Coupler Using Non-Uniform Folded Transmission Line and Shunt Step Impedance Stub With Harmonics Suppressions
Keywords:
Branch-line coupler (BLC), harmonics suppressions, non-uniform folded transmission line (NUFTL), shunt step impedance stub (SSIS)Abstract
In this paper, a novel compact branch-line coupler (BLC) using non-uniform folded transmission line (NUFTL) and shunt step impedance stubs (SSISs) with harmonics suppressions is presented and its design procedure is discussed. In the proposed structure, in order to reject the unwanted harmonic pass bands, a pair of SSISs is implemented along the ports of the coupler. To minimize the physical size of the coupler, NUFTL are used instead of uniform transmission lines in each arm of the branch-line. With the proposed approach, the size of the quarter-wavelength transmission line in the branch-line can be reduced greatly. The presented BLC has a compact size while showing good return loss and insertion loss characteristic in the frequency band of interest. Good agreement exists between the simulated and measured results.
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References
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