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A tunable dual-mode microstrip bandpass filter for mobile GSM and ISM bands (2000 MHz to 2.45 GHz) is proposed and characterized. The structure is composed of a meander loop dual-mode resonator and four loading capacitances. Perturbation of the degenerate modes is achieved by combination of a small square patch and an additional meander line resonator. Frequency tuning is made possible by modifying...
We present and demonstrate a new optical double-sideband modulation technique that is free of dispersion induced RF power fading. The predicted 3-dB RF power improvement over optical single sideband modulation is experimentally verified.
A novel technique for multiple-element phased high-order subharmonic self-oscillating mixers (SOMs) is presented. SOMs are excellent choices for a low-cost receiver design as both the oscillating source and the mixer are combined in one single device. The presented structure is of high interest for high-end millimeter-wave systems as subharmonic operation reduces local oscillator (LO) frequency requirements...
This paper presents, for the first time, a singly balanced mixer on the basis of a substrate integrated waveguide (SIW) magic-T structure. This scheme has a number of attractive inherent features such as a high isolation between input ports and also a stable phase relation between output ports. The mixer is designed and fabricated by means of a standard printed circuit board (PCB) process and measurements...
Layout design techniques are examined in order to reduce potential radiation loss of feed circuits. Hybrid mode method of moments (MoM) is used to characterize microstrip discontinuities such as bends, steps and T-junctions that are building blocks in a planar integrated RF feed. It includes frequency dispersion, radiation and leakage losses. The equivalent circuit of these elements can be obtained...
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