A 250 GHz planar low noise Schottky receiver

A planar quasi-optical Schottky receiver based on the quasi-integrated horn antenna has been developed and tested over the 230–280GHz bandwidth. The receiver consists of a planar GaAs Schottky diode placed at the feed of a dipole-probe suspended on a thin dielectric membrane in an etched-pyramidal horn cavity. The diode has a 1.2 Μm anode diameter and a low parasitic capacitance due to the use of an etched surface channel. The antenna-mixer results in a measured DSB conversion loss and noise temperature at 258GHz of 7.2dB±0.5dB and 1310K±70K, respectively, at room temperature. The design is compatible with SIS mixers, and the low cost of fabrication and simplicity makes it ideal for submillimeter-wave imaging arrays requiring a 10–20% bandwidth.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/44552/1/10762_2005_Article_BF02084284.pd

A 4–18‐GHz reconfigurable RF MEMS matching network for power amplifier applications

We have developed a novel reconfigurable matching network based on the loaded-line technique. The network is composed of N -switched capacitors ( N = 4–8) with a capacitance ratio of 4–5:1 and is suitable for power amplifiers at 4–18 GHz, or as an impedance tuner for noise parameter and load-pull measurements at 10–28 GHz. The networks are very small, and offer better performance than double or triple stub matching networks. Extensive loss analysis indicates that the 8-element network has a loss of 0.5 dB at 4–12 GHz, and less than 1.5 dB at 18 GHz, even when matching a 10Ω output impedance to a 50Ω load. As expected, the 4-element matching network has about half the loss of the 8-element network, but with much less impedance coverage. Both networks were simulated and measured in high VSWR conditions and can handle at least 500 mW of RF power at 4–18 GHz. The application areas are in phased array antennas, reconfigurable power amplifiers, and wideband noise-parameter and load-pull measurement systems. © 2004 Wiley Periodicals, Inc. Int J RF and Microwave CAE 14: 356–372, 2004.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/35229/1/20021_ftp.pd

CPW-fed slot antennas on multilayer dielectric substrates

International audienc

Compact 2-Pole and 4-Pole 2.4-2.8 GHz Dual-Mode Tunable Filters

International audienc