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A polarisation reconfigurable microstrip patch antenna element is presented. The antenna includes a liquid crystal based tunable coupled line by which the antenna polarisation can be controlled. The prototype is fabricated in a similar fashion to LC displays resulting in a low-cost and simple fabrication compared to other tunable device fabrication technologies. The antenna operates at 13.75 GHz with...
This paper presents the design and realization of a compact phase shifter based on a tunable dual-mode ring resonator filter at 35 GHz. The tunability is achieved by employing a thin liquid crystal layer as a tunable dielectric substrate. By applying a bias voltage in the range of 0…40V, a tunable phase range of 117° is measured. The figure of merit of the realized phase shifter is 30.6 °/dB at 34...
Telemedicine is producing a great impact in the monitoring of patients located in non-clinical environments such as homes, gymnasiums, schools, remote military bases, ships, and rural area. A number of applications, ranging from data collection to chronic patient monitoring, and even to the control of therapeutic procedures, are being implemented in many parts of the world. As part of this growing...
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