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High Power handling capabilities are not the main focus in MEMS varactor research and development. In this paper MEMS varactors with excellent RF power handling capabilities of up to 16 VPP for application in low noise wideband RF VCOs (Voltage controlled oscillators) have been designed, fabricated and characterized. These MEMS varactors are embedded in the BEOL (Back end of line) metallization stack...
In this paper we present the design of Liquid Crystal filled waveguide resonators. Waveguide resonators achieve higher Q-factors then planar technologies, and form the basis for filters of smaller bandwidth. Two possible approaches for positioning the Liquid Crystal inside the cavity are discussed. One of this approaches is designed to fulfill the requirements for mechanical and temperature stability...
The concept of the frequency switching in the composite bulk acoustic wave (BAW) resonators based on the thin films of the paraelectric-phase ferroelectrics is demonstrated experimentally for the first time. The composite BAW resonators based on the Ba0.25Sr0.75TiO3/SrRuO3/Ba0.25Sr0.75TiO3 multilayer structure are fabricated and characterized. It is shown that the resonance frequency of the BAW resonators...
In this paper, a novel inkjet printing technology is presented, which allows the fabrication of fully printed tunable RF components. A tunable phase shifter is fabricated to demonstrate the capabilities of this simple, flexible and low-cost method. The proposed phase shifter contains tunable ferroelectric varactors in metal-insulator-metal (MIM) configuration, which is fully inkjet-printed on top...
The branch-line coupler (BC) circuit of miniaturized configuration using periodically installed open circuit stabs was designed onto an electro-optic (EO) crystal, LiNbO3, substrate at 10 GHz. The operation as the 90 degree hybrid was confirmed at around the center frequency by the experiment. By using this BC circuit as the signal power divider, we proposed a compact EO single sideband (SSB) modulator...
New array antenna electrode electro-optic (EO) modulators using a thin EO crystal film stacked on a glass substrate and polarization-reversed structures were proposed for 60 GHz space-division-multiplexing (SDM) wireless systems. 4-channel 60 GHz SDM wireless signals were successfully converted to different lightwave signals according to their irradiation angles. The measured SDM channel isolation...
In the last years, the development of broadband microwave sensors for cell detection has become a great challenge. In this work, a broadband microchamber integrated with microfluidics is used for cell detection in the GHz range. Measurements of scattering parameters have been carried out, demonstrating the capability of the device to discriminate different number of cells between the electrodes. Stable...
To date, research and development to detect the leukemia is proceeding by using the dielectrophoresis which is a phenomenon that the particle is moved by the slope of the electric field. Compared with the traditional leukemia detection systems, this system using the dielectrophoresis is more attractive because of low cost, fast detection, and easy operation. With this in mind, the high frequency characteristics...
This paper presents a microstrip variable delay line loaded with liquid crystal varactors in series. The design of the device, including both the theoretical analysis and the fabrication, is presented. The proposed design shows a high LC varactor tuning efficiency of 83% and a low response time in the order of 3 seconds. These high performances result from implementing the varactors in parallel plate...
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