Broadband millimeter wave receiver with dual polarization
ABSTRACT Receivers with broad frequency bandwidth and low noise provide improved sensitivity for millimeter wave remote sensing and astrophysical observations, because the signal is wideband gaussian noise. For the study of the water cycle and rapidly evolving phenomena, such as hurricanes, the soundings of temperature and humidity profiles of atmosphere are achieved around the resonant frequencies of 118 GHz (oxygen) and 183 GHz (water) correspondingly. We developed a single horn receiver front end that achieved these goals. This broadband single horn receiver is especially beneficial for large interferometric sounding instruments that can now be integrated with only a single array of receivers for both temperature and humidity sounding.
Conference Proceeding: Recent developments in 180 GHZ MMIC LNA and receiver technology[show abstract] [hide abstract]
ABSTRACT: Humidity sounding of the atmosphere is a highly important measurement for operational weather forecasting and science purposes. Currently the humidity profile is observed with ground based, airborne and LEO satellite instruments by measuring radiometric temperature on the flanks of the 183 GHz water vapor line. We have developed MMIC based LNAs and receivers with less that 400 K noise temperature for current airborne and future space based humidity sounding instruments.Microwave Radiometry and Remote Sensing of the Environment (MicroRad), 2010 11th Specialist Meeting on; 04/2010
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ABSTRACT: At millimeter-wave frequencies, corrugated horns can be difficult and expensive to manufacture. As an alternative we present here the results of a theoretical and measurement study of a smooth-walled spline-profile horn for specific application in the 80-120 GHz band. While about 50% longer than its corrugated counterpart, the smooth-walled horn is shown to give improved performance across the band as well as being much easier to manufacture.IEEE Transactions on Antennas and Propagation 04/2004; · 2.33 Impact Factor
Article: Wide-band orthomode transducers[show abstract] [hide abstract]
ABSTRACT: A summary of the results of a mainly experimental investigation into the development of wideband orthomode transducers (OMTs) is presented. It is shown that satisfactory performance for many applications is possible over bandwidths in excess of 2:1. The wideband return loss and cross-polarization behavior are given where the OMT used is measured in conjunction with a wideband corrugated horn. Two types of OMT are considered: one based on a finline technique and the other on a quad-ridged waveguide geometry. Overall, the latter design gives superior performanceIEEE Transactions on Microwave Theory and Techniques 03/1991; · 2.23 Impact Factor