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Planar self-similar antennas for broadband millimeter-wave measurements

Meinke, J., Mauskopf, P., Johnson, B. R., Flanigan, D., Irwin, K., Li, D., Cho, H.-M., Day, P., McMahon, J., Doyle, S. ORCID: and Ade, P. A. R. ORCID: 2020. Planar self-similar antennas for broadband millimeter-wave measurements. Journal of Low Temperature Physics 199 , pp. 281-288. 10.1007/s10909-020-02427-0

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Self-similar antennas offer extremely broadband functionality and easily scalable designs. Self-similar designs with a four-arm layout are also suited for dual polarization through excitations of opposing arms, although there has only been limited use of them for millimeter-wave detectors. These antennas have been used for measurements of the cosmic microwave background (CMB), which encompass a wide frequency range and are now actively focusing more on polarization anisotropies. We analyze multiple planar self-similar antenna designs with simulations in high-frequency structure simulator and ongoing physical testing. They all exhibit broadband operation between 130 and 230 GHz and can couple to both linear polarizations through the previously mentioned four-arm symmetry. Simulations include each antenna design coupled to an extended hemispherical, AR-coated lenslet. From these, a basic bowtie-like arm design produced minimal polarization wobble with moderate beam efficiency, while a hybrid trapezoidal design provided high beam efficiency with small polarization wobble. Current fabrication versions of each are being tested, coupled to multichroic microwave kinetic inductance detectors. These planar self-similar antennas, when implemented in CMB and other detectors, could improve observations while simultaneously simplifying fabrication and detector layout.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Publisher: Springer Verlag
ISSN: 0022-2291
Date of First Compliant Deposit: 10 March 2020
Date of Acceptance: 15 November 2019
Last Modified: 07 Nov 2023 05:23

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