Search for dissertations about: "sideband"

Showing result 1 - 5 of 24 swedish dissertations containing the word sideband.

  2. 1. Development of a Sideband Separating SIS Mixer Technology for MM-Wavelengths

    Author : Vessen Vassilev; Chalmers tekniska högskola; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; mm-wave receiver; SIS mixer; radio astronomy instrumentation; waveguide to microstrip transition; sideband separation receiver;

    Abstract : This thesis presents work done in developing instrumentation for mm-wave radio astronomy. The main subject of the thesis is a sideband separating (2SB) receiver for 85-115 GHz based on a quadrature scheme with two identical SIS mixer junctions pumped by a LO applied with 90° phase difference. READ MORE

  4. 2. Improved components for 2SB THz receivers with enhanced sideband rejection performance

    Author : Hawal Marouf Rashid; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Thin-film Circuits; S-parameters Measurements; Sideband Separating Receivers; Superconducting Circuits; Millimetre Wave Mixers; Directional Coupler; Terahertz Technology; Waveguide Directional Coupler;

    Abstract : The thesis presents work done in improving the sideband rejection ratio for 2SB cryogenic radio astronomy receivers in general, but more specifically, for the future Onsala 20 m 3-mm receiver system and the ALMA Band 5. In order to attain better than 15 dB sideband rejection ratio over the entire bandwidth (approximately 26% RF fractional bandwidth and one octave the IF bandwidth), it is necessary to improve both RF and IF hybrid assembly to optimum performance, i. READ MORE

  5. 3. Sideband manipulation in magic-angle-spinning nuclear magnetic resonance

    Author : Oleg N. Antzutkin; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Magnetism; Analytisk Kemi;

    Abstract : .... READ MORE

  6. 4. Design and Performance of Some Components for a Millimeter Wave Imaging Receiver

    Author : Guillermo F. Delgado Gunckel; Chalmers tekniska högskola; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; nipi MQW; imaging receiver; lens shaping; diplexer; kinoform; opto-electronic quasi-optical modulation; dielectric lenses; sideband filter; diffractive optics;

    Abstract : This thesis deals with the design and performance of some novel devices for an imaging receiver, operating in the frequency band centered at 100 GHz, to be used in radio astronomy research. The emphasis is given on simple, small and reliable devices in order to reduce the complexity of an already complex receiver. READ MORE

  7. 5. Subharmonic Sideband Separating Schottky Diode Mixer for Submillimetre Wave Applications

    Author : Peter Sobis; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Abstract : .... READ MORE