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Journal Achievements of Modern Radioelectronics №8 for 2010 г.
Article in number:
Analysis of Multi-Beam Immersion Lens Antenna for High-Sensitive Submillimeter Wave Transition-Edge Sensor
Keywords: multi-beam antenna immersion lens antenna double-slot antenna transition-edge sensor submillimeter waves
Authors:
A. V. Uvarov, S. V. Shitov, A. N. Vystavkin
Abstract:
Multi-beam antenna for imaging array detector based on transition-edge sensor development approach was considered in the paper. An integral immersion lens antenna with double-slot planar feed placed into lens focus was examined. Analysis method is based on the numerical simulation of properties of the immersion lens antenna, and consists of ray-tracing technique and diffraction theory combination. The diffraction problem at the lens was reduced to the calculation of the Kirchhoff-Huygens integral. An approximation of a sinusoidal magnetic current distribution along the slots was made. Optimal configuration of a single planar double slot antenna with a symmetrical radiation pattern was obtained as a result of numerical analysis: l=0,28λ, (1а) d=0,155λ0, (1b) where λ0 - wavelength in vacuum, l - slot length, а d - the distance between the slots. It was shown that the highest directivity of immersion extended hemispherical lens antenna is achieved when the distance between the feeder and the center of the spherical surface of the lens associated with the radius as: Lext≈(0.34...0.36). Conception of multi-beam immersion lens antenna with rectangular double-slot feed array was considered. Quasioptical system for effective coupling multi-beam immersion lens antenna pattern with a telescope was proposed. Theoretical possibility to increase focal plane array packing density versus a feed-horn array with the same value of aperture efficiency was illustrated. The results of numerical simulations showed that for a double slot feed array of immersion lens antenna filling factor can be increased up to 25%. Restriction on the minimum diameter of the immersion lens was deduced from the criterion of acceptable level of aberration for the extreme elements of the planar feed array. The results of the evaluation suggest the usefulness of multi-beam immersion lens antennas for millimeter and submillimeter wave telescopes with small sizes of the focal region.
Pages: 43-50
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