THz smooth-walled spline horn antennas: Design, manufacturing and measurements

Hammar, Arvid; Nyberg, Daniel; Karandikar, Yogesh B.; Sobis, Peter; Tropp, Oscar; Forsberg, Per; McCallion, Steven; Emrich, Anders; Stake, Jan

doi:10.1109/aps.2016.7696378

Cited by 8 publications

(1 citation statement)

References 5 publications

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“…18 Although the integrated horn topology has the advantage of decreased receiver noise temperature, a misalignment between the two block halves can have a negative impact on the system performance. A tolerance study was therefore performed to investigate the effects of lateral displacement between the two block halves.…”

Section: B Lens and Spline Horn Antennamentioning

confidence: 99%

Low noise 874 GHz receivers for the International Submillimetre Airborne Radiometer (ISMAR)

Hammar

Sobis

Drakinskiy

et al. 2018

Review of Scientific Instruments

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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 led to a reduction in 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 24 W 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. Return loss of a prototype of the spline horn and lens was measured using a network analyzer and frequency extenders to 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.

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Section: B Lens and Spline Horn Antennamentioning

confidence: 99%