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Chen M.,Fu Jen Catholic University | Ho M.-H.,National Changhua University of Education | Xu W.-Q.,Universal Microwave Technology Inc | Lin L.-J.,Universal Microwave Technology Inc | Hsu W.-H.,Universal Microwave Technology Inc
International Journal of Electrical Engineering | Year: 2010

In this paper, a quasi-lumped design of filters using the suspended stripline (SSL) is demonstrated. The proposed SSL filters have achieved the benefits of size compactness, extremely low insertion losses, low dispersion, high operation frequency, and sometimes the wide stopband bandwidth. The filters presented in this paper include low-pass filters (LPFs), high-pass filters (HPFs), and a sample bandpass filter (BPF). The BPF is implemented by a cascade of an LPF and an HPF, which together form an ultra-wideband (UWB) BPF that covers a frequency range from 3.1 to 10.6 GHz. All of the mentioned filters are analyzed by their equivalent circuit models based on a lumped elements approach. The plotted curves of the calculated data obtained from equivalent circuit models and those from the commercial electromagnetic software vs. the dimensions of the SSL filters are given in the figures. Experiments are conducted to verify the filters' performance.

Ho M.-H.,National Changhua University of Education | Lin W.-C.,Universal Microwave Technology Inc
Microwave and Optical Technology Letters | Year: 2011

We present a novel UMTS diplexer design using the filters of antiparallel-coupled lines structure loaded with a stepped impedance microstrip resonator. The diplexer is composed of two filters. And a microstrip line of quarter-wavelength is used to links each filter to the common port. The composing filters exhibit two tunable transmission zeros which are used to implement the mid-passband zero implantation for improving the isolation between the transmitting (Tx) and the receiving (Rx) ports. A pair of spurlines is used in the coupled lines of the Tx-filter to further increase the isolation. An experiment is conducted to assure the diplexer's performance and to verify the circuit design. © 2011 Wiley Periodicals, Inc.

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