Development of a MEMS Microwave Switch and Application to Adaptive Integrated Antennas

Adaptive integrated antennas are serious candidates for achieving the performance requirements of next-generation, broadband, wireless systems. This paper reports on the development of a microelectromechanical system (MEMS) shunt switch and its application to reconfigurable patch antennas. The micromachining procedure employs hexa-methyldisilizane (HMDS) as an anti-stiction surface treatment, significantly increasing the process yield. A MEMS shunt switch was designed for 10-20 GHz operation in a coplanar waveguide (CPW) regime. At 20 GHz, the insertion loss of the switch in the on-state was measured to be 0.25dB, while an isolation of 10 dB was obtained in the off-state. Further improvement in the off-state isolation appears possible. The MEMS switch is applied to a novel co-planar patch antenna configuration in order to achieve adaptive radiation characteristics. A 30 GHz patch design shows in simulation a phase shift of 70 degrees between the two operating states

Study of a Ferrite LTCC Multifunctional Circulator With Integrated Winding

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A Dual-Band Dual-Circular-Polarization Antenna for Ka-Band Satellite Communications

A novel Ka-band dual-band dual-circularly-polarized antenna array is presented in this letter. A dual-band antenna with left-hand circular polarization for the Ka-band downlink frequencies and right-hand circular polarization for the Ka-band uplink frequencies is realized with compact annular ring slots. By applying the sequential rotation technique, a 2 × 2 subarray with good performance is obtained. This letter describes the design process and presents simulation and measurement results

Circulateur LTCC Ferrite large-bande à structures empilées en bande K

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Dispersion compensation in CPW-based optical modulators and photo-detectors using MEMS technology

A MEMS tunable optical coplanar waveguide (CPW) based modulator/ photo-detector is introduced. It could apply phase and amplitude corrections at both ends of an optical link, potentially reducing the Inter Symbol Interference (ISI) caused by dispersive effects