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A 700 GHz unilateral finline SIS mixer fed by a multi-flare angle smooth-walled horn

Tan, Boon-Kok and Yassin, Ghassan and Grimes, Paul and Leech, Jamie and Jacobs, Karl and Withington, Stafford and Tacon, Mike and Groppi, Christopher and Zmuidzinas, Jonas (2010) A 700 GHz unilateral finline SIS mixer fed by a multi-flare angle smooth-walled horn. In: Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy V. Proceedings of SPIE. No.7741. Society of Photo-Optical Instrumentation Engineers , Bellingham, WA, Art. No. 774110. ISBN 9780819482310. http://resolver.caltech.edu/CaltechAUTHORS:20160302-163604815

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Abstract

We present the design of a broadband superconductor-insulator-superconductor (SIS) mixer operating near 700 GHz. A key feature of our design is the utilisation of a new type of waveguide to planar circuit transition comprising a unilateral finline taper. This transition is markedly easier to design, simulate and fabricate than the antipodal finline we employed previously. The finline taper and the superconducting circuitry are deposited on a 15 mu m thick silicon substrate. The employment of the very thin substrate, achieved using Silicon-On-Insulator (SOI) technology, makes it easy to match the incoming signal to the loaded waveguide. The lightweight mixer chip is held in the E-plane of the waveguide using gold beam leads, avoiding the need for deep grooves in the waveguide wall. This new design yields a significantly shorter chip, free of serrations and a wider RF bandwidth. Since tuning and all other circuits are integrated on the mixer chip, the mixer block is extremely simple, comprising a feed horn and a waveguide section without any complicated mechanical features. We employ a new type of smooth-walled horn which exhibits excellent beam circularity and low cross polarisation, comparable to the conventional corrugated horn, and yet is easier to fabricate. The horn is machined by standard milling with a drill tool shaped into the horn profile. In this paper, we describe the detailed design of the mixer chip including electromagnetic simulations, and the mixer performance obtained with SuperMix simulations. We also present the preliminary measurements of the smooth-walled horn radiation patterns near the mixer operating frequencies.


Item Type:Book Section
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1117/12.856711DOIArticle
http://proceedings.spiedigitallibrary.org/proceeding.aspx?articleid=1346803PublisherArticle
Additional Information:© 2010 SPIE. This project is partially funded by AMSTAR+ of RadioNet and an STFC follow-on-fund grant.
Group:Keck Institute for Space Studies
Funders:
Funding AgencyGrant Number
RadioNetUNSPECIFIED
Science and Technology Facilities Council (STFC)UNSPECIFIED
Subject Keywords:Superconductor-Insulator-Superconductor mixer, unilateral finline taper, Silicon-On-Insulator technology, smooth-walled horn, direct-drilling technique
Record Number:CaltechAUTHORS:20160302-163604815
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20160302-163604815
Official Citation:Boon-Kok Tan ; Ghassan Yassin ; Paul Grimes ; Jamie Leech ; Karl Jacobs ; Stafford Withington ; Mike Tacon and Christopher Groppi "A 700 GHz unilateral finline SIS mixer fed by a multi-flare angle smooth-walled horn", Proc. SPIE 7741, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy V, 774110 (July 15, 2010); doi:10.1117/12.856711
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:64974
Collection:CaltechAUTHORS
Deposited By: Colette Connor
Deposited On:05 Mar 2016 00:59
Last Modified:04 Mar 2019 18:47

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