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A new bandpass filter (BPF) with a good frequency selectivity using lumped resistor-loaded element is proposed. The filter is composed of a parallel-coupled line shunted with a folded open-ended stub and a coupled line loaded with lumped resistor. The proposed filter has been designed, simulated, optimized for wireless communication system, and the obtained frequency responses have demonstrated a...
A new and miniaturized narrow bandpass filter (BPF) with very wide upper stopband is proposed. The filter consists of an open-loop resonator with the broadside coupled microstrip/slot hybrid unit and a microstrip open-loop resonator with short-circuited units, and the two resonators are edge-coupled to improve the performance of the filter. The effective area of designed filter is about 40.4×20 mm...
A novel and compact bandpass filter (BPF) using meandered microstrip/coplanar waveguide (CPW) hybrid structures paralleled with a pair of open-ended stepped impedance resonators (SIRs) is proposed. The distinct filtering characteristics of this new classification of transmission line filter are investigated theoretically and experimentally. At the bottom of substrate material, the two identical CPW...
An ultra-wideband (UWB) bandpass filter is presented, with excellent passband performance and improved out-of-band sharpened rejection. It is constructed with Koch island-shaped stepped impedance lines and a composite right/left handed transmission line synthesised by etching a Koch fractal-shaped ring slot in the ground plane and a series capacitive gap in the conductor strip. The equivalent circuit...
A novel and compact dual-band bandpass filter (BPF) using microstrip/coplanar waveguide (CPW) composite structure is proposed. At the bottom of substrate material, the two CPW open-circuited resonators are broadside-coupled to the top microstrip transmission lines. The proposed dual-band filter has been simulated, optimized, and the obtained frequency responses demonstrated the filter with a good...
A novel low-pass filter (LPF) with harmonic-suppressed, sharp-rejection slop, wide and deep stop-band attenuation properties is proposed, which is composed of coplanar waveguide (CPW) short-circuited stubs and microstrip shunt open-end stubs as series and shunt components in the pass-band. Based on this composite microstrip/CPW structure, the low-pass filter with excellent electrical performances...
40 Gbit/s reconfigurable photonic logic gates with XNOR, AND, NOR, OR and NOT functions are demonstrated, based on various nonlinearities of a single semiconductor optical amplifier (SOA), including four-wave mixing (FWM), cross-gain modulation (XGM) and transient cross-phase modulation (T-XPM). Detuning optical bandpass filters are employed to enhance the SOA modulation bandwidth.
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