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Meckenheim, Germany

Lewark U.J.,Karlsruhe Institute of Technology | Mahler T.,Karlsruhe Institute of Technology | Antes J.,University of Stuttgart | Boes F.,University of Stuttgart | And 4 more authors.
CEAS Space Journal | Year: 2015

Attenuation measurements through extreme rain in a climate wind tunnel are carried out to benchmark the possibility of wireless data transmission at 77 GHz during adverse weather conditions. Based on a network analyzer and external E-band mixers, the propagation loss at 77 GHz is obtained over a distance of 180 m using a corner reflector at the end of a 90-m tunnel. Comparing the results to prediction models like the ITU-R P.838, a large deviation of several tens of dB/km was found for high rain rates when the drop size distribution is neglected. In the paper, the authors use known attenuation models based on rain drop distribution functions to explain the high measured attenuation during the testing, demonstrating a large variation of specific attenuation under heavy rain at high microwave frequencies. © 2015, CEAS.


Gibson H.J.,Gibson Microwave Design | Cojocari O.,Compound Semiconductor Technologies | Oprea I.,Compound Semiconductor Technologies | Thomas B.,Radiometer Physics GmbH RPG | Narhi T.,European Space Agency
26th International Symposium on Space Terahertz Technology, ISSTT 2015 | Year: 2015

Several recent space missions have required un-cooled receivers for radiometer use above 500GHz for atmosphere probing. These include MetOP 2nd generation meteorological satellites and Jupiter Moons JUICE spacecraft. The preferred technology for these missions is high performance (uncooled) Schottky balanced mixer but producing the necessary Local Oscillator (LO) pump power is a formidable challenge. This paper outlines the design of a 600GHz tripler, capable of providing in excess of 5mW, capable of driving a sub-harmonic Schottky mixer for 1.2THz. The project is part of ESA initiative AO-6649 to develop key technologies for high power, high frequency Local Oscillator sources for future space missions.


Thomas B.,Radiometer Physics GmbH RPG | Walber A.,Radiometer Physics GmbH RPG | Treuttel J.,LERMA | Henneberger R.,Radiometer Physics GmbH RPG | Alderman B.,Teratech Co.
23rd International Symposium on Space Terahertz Technology 2012, ISSTT 2012 | Year: 2012

We present here a novel biasing scheme similar to [1] for balanced frequency triplers that is compatible with flip-chip mounting of the Schottky diodes chip onto a host carrier circuit, and that does not involve complicated lithographic fabrication techniques such as on-chip or on-circuit thin film capacitors. It uses coupled suspended striplines circuit architecture in order to bring two separate biasing lines to both half of the chips, allowing for independent biasing of each half of the diodes chip. This can be advantageous in order to correct for slight imbalances in the chip and circuit. Measurement results on a 83-105 GHz tripler using Teratech discrete tripler diodes and an AlN based circuit with a coaxial input shows a typical efficiency of approx. 7 %, with input power handling up to 200 mW, and 3 dB RF bandwidth of 83-105 GHz.

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