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In this paper, a wideband bandpass filter (BPF) with very compact circuit size is proposed. Specifically, the circuit size of a 5th-order multi-mode resonator BPF is largely reduced by replacing all transmission line sections with bridged-T coils. The resulted lumped-element BPF can then be implemented using the integrated passive device technology to achieve very compact chip size. To improve also...
This study developed a 2×4 dual-band left-handed circular polarization (LHCP) patch antenna array for receiving Global Positioning System (GPS) reflections at 1227 MHz and 1575 MHz. The antenna element is achieved by probe feed stacked patch and the signal is combined by an 8-way power divider. According to the measured results, the axial ratio at the center frequencies is below 3 dB and the peak...
An enhancement-mode AlGaN/GaN MIS-HEMTs with low threshold voltage hysteresis using damage-free neutral beam etched (NBE) gate recess is reported. The NBE can eliminate the plasma-induced defects that generated by irradiating UV/VUV photons as encounted in the conventional inductively coupled plasma-reactive-ion etching (ICP-RIE). Combining the new gate recess process and PEALD-AlN interfacial passivation...
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