Presentation + Paper
16 August 2024 ALMA2030 Band-4+5 receiver front-end wideband sensitivity upgrade: first year initial development and future plan
Author Affiliations +
Abstract
The idea of ALMA Band-4+5 receivers are proposed for the upgrade after 2030. The new receiver will cover the RF frequency of the original Band-4 and Band-5 with continuous frequency tuning over 125 –211 GHz with dual polarizations, dual sidebands capability. The instantaneous intermediate frequency (IF) bandwidth is up to 16 GHz per sideband and per polarization. Both the SIS-based receiver and HEMT-based receiver schemes are considered. For the SIS receiver scheme, the niobium-based SIS junctions will be fabricated to form mixer chips, and integrated into the mixer blocks with broadband waveguide 3-dB quadrature hybrid couplers with LO couplers, cryogenic IF low-noise amplifiers, and 2-20 GHz coaxial 3-dB quadrature hybrid couplers to form sideband separating down-converters. The inputs of the sideband separating down-converters are fed by the ellipsoidal mirror pairs, corrugated feedhorn and the orthomode transducer. For the HEMT-based receiver scheme, using the same optics configuration as the SIS-based receiver, the cryogenic InP HEMT low-noise amplifiers (LNAs) chains cover 125 – 211 GHz operated in 15-K ambient temperature will be the key components of the cold cartridge assembly (CCA). For the warm cartridge assembly, a pair of sideband-separating diode or resistive transistor mixers will provide four-channel 16-GHz IF instantaneous bandwidth. To avoid the possible interference between LO and IF signals, considering the possible 16 GHz IF bandwidth over 4 – 20 GHz, the LO fundamental frequency will be chosen in 24 - 32 GHz, followed by an active frequency tripler to form the phase-lock loop with 72 – 96 GHz frequency tuning range. The key components with 51.2% relative bandwidth to be developed in-house are Nb SIS mixers, RF InP HEMT LNAs, 3-dB waveguide hybrid couplers, orthomode transducers, corrugated horn antenna, and optics mirror pairs.
Conference Presentation
(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.
Yuh-Jing Hwang, Bangwon Lee, MingJye Wang, Yu Chieh Huang, Chau-Ching Chiong, Yue-Fang Kuo, Chen Chien, Chin-Ting Ho, Tse-Jun Chen, Wei-Chun Lu, Yen-Pin Chang, Hsiao-Wen Chang, Chuang-Ping Chiu, Jia-Ruei Nian, Chao-Ching Wang, Fang-Yu Hsu, Pai-An Chen, Lou-Chien Lu, Patrick Koch, Takafumi Kojima, and Alvaro Gonzalez "ALMA2030 Band-4+5 receiver front-end wideband sensitivity upgrade: first year initial development and future plan", Proc. SPIE 13102, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy XII, 131020M (16 August 2024); https://doi.org/10.1117/12.3017708
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KEYWORDS
Receivers

Design

Waveguides

Cryogenics

Mirrors

Antennas

Field effect transistors

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