Kam-Weng Tam

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In this paper, a tunable bandpass filter using cross-shaped multiple mode resonators (MMRs) and <i>N</i>:1 transformer based external quality factor tuning structures is proposed. The use of a cross-shaped MMR simplifies inter-resonators control while two <i>Qe</i> tuning structures are investigated and incorporated with the MMR to implement simultaneous(More)
In this paper, a novel terminated cross-shaped resonator (TCSR) is analyzed and used to design ultra-wideband (UWB) bandpass filters (BPFs) with fixed and reconfigurable notch bands. It is found that the TCSR can exhibit a maximum three poles and two zeros when open and short terminations are applied. The intrinsic zero is simply used for the implementation(More)
This paper addresses the problem of rate selection for the cooperative hybrid automatic repeat request with chase combination (HARQ-CC) system, where time correlated Nakagami-m fading channels are considered. To deal with this problem, the closed-form cumulative distribution function (CDF) for the combine SNRs through maximal ratio combining (MRC) is first(More)
This paper presents a novel balanced dual-band bandpass filter with in-band common-mode suppression via multiple transmission zeros from the doubly short-ended coupled line. Through the analysis of coupled line structures, the transmission zeros in the differential- and common-mode equivalent circuits are extensively studied. In differential-mode, the(More)
In this paper, two kinds of wideband differential filters with intrinsic common-mode (CM) rejection are proposed. Both these filters are realized based on the multimode slotline resonators under the dual- and triple-mode resonance, respectively. For Filter 1, the microstrip lines with a pair of differential ports at the two sides are directly tapped on a(More)
A novel parallel coupled-line bandpass filter with suppression at the 2 harmonic frequency is presented in this paper. This structure offers a simple design methodology and corresponding implementation. An example of a 900 MHz prototype bandpass filter is used to demonstrate the performance of the new structure. The measured results agree well with the(More)