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An ultra-wideband (UWB) bandpass filter with extended upper-stopband on multilayer liquid-crystal-polymer (LCP) substrate is presented in this paper. The proposed filter is designed to select the frequency band from 1.0 to 20 GHz. The filter consists of two parallel-coupled stub-loaded resonators separated by a composite lowpass filter. The composite lowpass filter is implemented to obtain a very wide rejection band. The proposed filter is fabricated using multilayer LCP technology. Excellent agreement between expected and measured results of the filter is obtained. The measurement results show that the fabricated filter has a fractional bandwidth of 180% and a very low insertion loss of less than 0.6 dB at center frequency of 10.5 GHz. The measured filter has a wide stopband and an excellent rejection level higher than 40 dB. [ABSTRACT FROM AUTHOR]

ABSTRACT Design of millimeter-wave microstrip diplexer using elliptical open-loop ring resonators (OLRRs) for the next fifth generation (5G) wireless applications, is presented in this article. The proposed design consists of two 14-GHz and 28-GHz bandpass filters (BPFs). Each BPF consists of elliptical OLRRs that couple two microstrip lines. The geometrical parameters of both BPFs can easily adjust the passband and stopband frequencies to the desired frequencies. The proposed elliptical-shaped OLRRs show good broadband characteristics. The longer OLRR is responsible for achieving passband at the lower resonant frequency of 14 GHz while the shorter OLRR is used to generate a 28-GHz resonant frequency. The proposed diplexer has good return losses and insertion losses at the two resonant frequencies of 14 and 28 GHz. To validate the simulation results, the prototypes of the proposed designs are developed and tested. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:106-110, 2016 [ABSTRACT FROM AUTHOR]