Low noise 874 GHz receivers for the international submillimetre airborne radiometer (ISMAR)
Journal article, 2018

We report on the development of two 874 GHz receiver channels with orthogonal polarizations for the international submillimetre airborne radiometer. A spline horn antenna and dielectric lens, a Schottky diode mixer circuit, and an intermediate frequency (IF) low noise amplifier circuit were integrated in the same metallic split block housing. This resulted in a receiver mean double sideband (DSB) noise temperature of 3300 K (minimum 2770 K, maximum 3400 K), achieved at an operation temperature of 40 C and across a 10 GHz wide IF band. A minimum DSB noise temperature of 2260 K at 20 C was measured without the lens. Three different dielectric lens materials were tested and compared with respect to the radiation pattern and noise temperature. All three lenses were compliant in terms of radiation pattern, but one of the materials leads to a reduction in a noise temperature of approximately 200 K compared to the others. The loss in this lens was estimated to be 0.42 dB. The local oscillator chains have a power consumption of 24W and consist of custom-designed Schottky diode quadruplers (5% power efficiency in operation, 8%-9% peak), commercial heterostructure barrier varactor (HBV) triplers, and power amplifiers that are pumped by using a common dielectric resonator oscillator at 36.43 GHz. Measurements of the radiation pattern showed a symmetric main beam lobe with full width half maximum <5 and side lobe levels below 20 dB. The return loss of a prototype of the spline horn and lens was measured using a network analyzer and frequency extenders to be 750-1100 GHz. Time-domain analysis of the reflection coefficients shows that the reflections are below 25 dB and are dominated by the external waveguide interface.

Author

Arvid Hammar

GigaHertz Centre

Chalmers, Microtechnology and Nanoscience (MC2), Terahertz and Millimetre Wave Laboratory

Peter Sobis

GigaHertz Centre

Omnisys Instruments

Vladimir Drakinskiy

GigaHertz Centre

Chalmers, Microtechnology and Nanoscience (MC2), Terahertz and Millimetre Wave Laboratory

Anders Emrich

Omnisys Instruments

Niklas Wadefalk

Low Noise Factory AB

Joel Schleeh

Low Noise Factory AB

GigaHertz Centre

Jan Stake

GigaHertz Centre

Chalmers, Microtechnology and Nanoscience (MC2), Terahertz and Millimetre Wave Laboratory

Review of Scientific Instruments

0034-6748 (ISSN)

Vol. 89 5 055104

Areas of Advance

Information and Communication Technology

Infrastructure

Kollberg Laboratory

Nanofabrication Laboratory

Driving Forces

Sustainable development

Innovation and entrepreneurship

Subject Categories

Other Electrical Engineering, Electronic Engineering, Information Engineering

DOI

10.1063/1.5017583

More information

Latest update

10/12/2018