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A tunable balanced bandpass filter using a short coupled-line resonator is proposed. The design aims at achieving a wide tuning range in the differential-mode for both of the center frequency and bandwidth with high common-mode suppression. The proposed filter uses a short section (about one-eighth of one wavelength) of parallel-coupled lines connecting the differential ports of the device and five...
Intermodulation sensor concept is a solution for intelligent sensing: sensing is wireless and passive. It provides communication distances of several meters, high accuracy, and compliancy with the frequency regulations. The operation of the intermodulation sensor transponder is based on passive mixer diode loaded by a sensor resonator. We introduce the sensor concept, analyze the range of the system,...
A type of tunable narrow-bandpass filter is proposed in this paper. Fourth-order microstrip ring resonator with magnetic coupling is employed and loaded with varactors for achieving agility in the filter response. The simulation result showed that the center frequency of the proposed filter can be adjusted from 698 to 886 MHz and tuning range of 188 MHz, 1-dB constant absolute bandwidth of 9 MHz and...
This paper presents a novel H-Shaped reconfigurable microstrip patch antenna fed by a Grounded Coplanar Waveguide (GCPW) for wireless applications. The uniqueness in the presented antenna design relies in the ability to select the number of operating frequencies electronically by using a varactor diode. The antenna structure consists of coplanar waveguide (CPW) input with an H-shape printed on a PCB...
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