| 1. |
- Banik, Biddut Kumar, 1978, et al.
(författare)
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Catadioptric Dielectric Lens for Imaging Applications
- 2008
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Ingår i: Proceedings of 33rd International Conference on Infrared, Millimeter, and Terahertz Waves. - 9781424421190 ; , s. 1 - 2
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Konferensbidrag (refereegranskat)abstract
- The design and characterization results of a novel catadioptric dielectric lens are presented. Although being electrically small, the lens provides a focus in the close vicinity which makes it suitable to be used in microwave and terahertz systems. Several lenses of different dielectric materials and dimensions have been fabricated. A simple backscattering measurement method has been implemented in order to determine the focusing property of the lens.
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| 2. |
- Chicherin, Dmitry, et al.
(författare)
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Micro-fabricated High-impedance Surface for Millimeter Wave Beam Steering Applications
- 2008
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Ingår i: 33RD INTERNATIONAL CONFERENCE ON INFRARED, MILLIMETER AND TERAHERTZ WAVES. - NEW YORK : IEEE. - 9781424421190 ; , s. 574-576
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Konferensbidrag (refereegranskat)abstract
- A multi-layer high-impedance surface has been micro-fabricated and measured in W band. It consists of an array of capacitors placed on a dielectric substrate with a ground plane. Reconfigurability of the effective surface impedance of this structure can be enabled by applying control voltage to the tunable capacitors. Tunable impedance surfaces can be used in phase shifters for a phased array antenna, and directly as a smart beam steering surface.
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| 3. |
- Somjit, Nutapong, et al.
(författare)
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Novel RF MEMS Mechanically Tunable Dielectric Phase Shifter
- 2008
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Ingår i: 33RD INTERNATIONAL CONFERENCE ON INFRARED, MILLIMETER AND TERAHERTZ WAVES. - Pasadene, CA, USA : IEEE. - 9781424421190 ; , s. 643-644
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Konferensbidrag (refereegranskat)abstract
- This paper presents three variations of novel single-stage digital passive RF MEMS phase shifters. Relative phase shift is achieved by moving a micromachined lambda/2-long dielectric block by a MEMS actuator above a 3dimensional micromachined coplanar waveguide. The relative phase-shift of a single stage is determined by an artificially tailor-made dielectric constant of the block which is designed by a periodically etched pattern. The devices are fabricated and assembled by wafer-scale processes using bulk and surface micromachining. The measurement results show that already the first prototypes of the phase-shifter designs at the nominal frequency of 77 GHz have both in the up and in the down state a return loss better than -25 dB for 45 degrees and 300 phase shifter and better than -12 dB for 15 degrees phase-shifter with an insertion loss better than -0.9 dH at 5 GHz bandwidth. The phase shifters also perform well from 10-100 GHz with the return loss better than -10 dB, an insertion loss of less than -1.5 dB and a fairly linear phase-shift for the whole frequency range.
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