Abstract
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.
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Acknowledgements
This work is supported by NSF Grants AST-1509078 and AST-1711242 for Mauskopf; AST-1509211 and AST-1711160 for Johnson; AST-1506074 and AST-1710624 for Irwin. We would like to acknowledge Dr. A. Suzuki (UC Berkeley) for his HFSS sinuous design, used in our initial comparison.
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Meinke, J., Mauskopf, P., Johnson, B.R. et al. Planar Self-similar Antennas for Broadband Millimeter-Wave Measurements. J Low Temp Phys 199, 281–288 (2020). https://doi.org/10.1007/s10909-020-02427-0
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DOI: https://doi.org/10.1007/s10909-020-02427-0