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130-170GHz
Front-End for D-band ECE Radiometer
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Applications:
Electron cyclotron emission (ECE) measurements
130-170GHz Front-End for D-band ECE Radiometer is
another yet example of custom-designed equipment
developed by ELVA-1. The front-end consist of two
broadband downconverters, the first one for 130-150GHz
and the second one 150-170GHz. Both of the
donconverters have IF frequency band
1-20GHz. General design features of the front end
included high operating frequency combined with
high sensitivity. Each of the downconverters
designed as an integrated module combined local
oscillator with balanced mixer, filters and isolator
(for high frequency channel only).
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For calibration purposes the Front-end downconverter assembly
unit is supplied with wideband noise source for 130-170GHz. A
waveguide switch also included to the assembly unit (see
photo) to switch between input ECE signal and noise source
signal.
ELVA-1 has a wide experience in designing either front-ends
and turnkey systems for measurements of mm-wave radiation for
different scientific applications. Previous released projects
were for EFDA-JET (JET, the Joint European Torus), FTU tokamak
(Frascati, Italy), TCV (Lausanne), IPP Garching (Germany).
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Downconverter
assembly unit Specifications
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Operating Frequency Band: |
130-170 GHz |
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IF Frequency Band: |
1-20 GHz |
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Out Off Band Rejection |
45 dB (min) |
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Conversion Losses (131-150 GHz Low Band
Channel): |
16 dB (max)* |
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Conversion Losses (151-170 GHz High Band
Channel): |
21 dB (max)** |
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Operating Temperature: |
+10 to +40 deg. C |
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IF Connectors: |
SMA, female |
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RF Waveguide, Flange: |
WR-06,
UG-387/U-M |
* conversion losses value
included waveguide switch, directional coupler, high pass
filter
** conversion losses value included waveguide switch,
directional coupler, isolator, high pass filter
Fig.1. Block diagram of the 130-170GHz downconverter assembly
Fig. 2. Conversion losses vs frequency for 130-170GHz
downconverter assembly diagram
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