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In this paper we discuss the adequate filter parameter selection to obtain a low loss coaxial cable, out of which a narrowband filtering device is designed. The design parameters under interest are the attenuation constant (a) obtained, which will depend on the size of the rectangular coaxial cross section used. And the decision beyond which frequency higher order modes should start to propagate through...
Several different fabrication techniques and materials have been proposed for the realization of low loss high-Q micromachined filters or tunable filters. In this paper a review of several filters that have been proposed over the last years is presented, including a discussion of topologies and the structures used to make microwave filters
Directional couplers have extensive applications in microwave circuits such as beamforming networks. Recently there has been growing scientific and commercial interest in microwave components for anti-crash and pre-crash systems in cars centered at 24 GHz. In this paper a novel suspended transmission-line 3 dB coupler at 24 GHz is presented. This circuit has been micromachined on a glass-quartz substrate...
The performance of micro-electro-mechanical system (MEMS) metal switches were investigated at wide temperature range. Measurements were carried out using cryogenic probe station and S-parameters were taken using a network analyser for frequencies up to 20 GHz. A total of 28 switches were evaluated. The investigation shows a 50% increase in the actuation voltage and a decrease in the percentage of...
This paper presents new ways of designing compact, low loss microwave filters. A quarter wavelength self supported air filled coaxial resonator is proposed, and several multi-resonator arrangements are discussed, which provide the means to produce new filter topologies using single and multilayer coaxial structures
In this paper, a novel monolithic surface micromachined half-coaxial transmission line filter was designed, fabricated and measured. The band pass filter presented here has a unique ground structure compared to the other research groups -the suspended ground plane is 100 ptm over the center conductor. The high Q0results from this large gap and an additional reduction of loss is obtained by using quartz...
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