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A simple technique is described to improve the performance of existing microwave filter in the fractional sense. In this technique, a relation is derived to obtain the values of conventional inductor and capacitor by equalizing the impedance in integer and in fractional sense, which behave as fractance devices. Further, this technique is applied to improve the performance of existing lowpass-bandpass...
The paper proposes two kinds of filter structures based on LTCC technology, which includes single layer stepped-impedance microstrip line structure and multilayer structure. According to the design of requirements, two kinds of filter with different structure are designed finally. And the difference between these two kinds of structures is proposed from physical dimensions and performance respectively...
The paper presents a new concept of bandpass filters based on ½ wavelength resonators short-circuited and loaded at their middle by a series capacitor. The advantage of this type of resonator is the compactness and the possibility of achieving tunable filters. Simulation results for a hybrid technology (PCB-Surface Mount Components) to validate the concept show that miniaturization can reach a factor...
An ultra-wideband (UWB) bandpass filter (BPF) for wireless communications is proposed in this paper. The BPF contains a stepped impedance resonator (SIR) and an improved split-ring resonator defected ground structure (SRR DGS). Both measurement and simulation are very matched and indicate that the proposed BPF achieves good characteristics with flat insertion loss less than 1 dB, and good return loss...
A new phase shifting network for both 180deg and 90deg phase shift with small phase errors over an octave bandwidth is presented. The theoretical bandwidth is 67% for the 180deg phase bit and 86% for the 90deg phase bit when phase errors are plusmn2deg. The proposed topology consists of a bandpass filter (BPF) branch, consisting of a LC resonator and two shunt quarter-wavelength transmission lines...
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