Abstract
We present the results of the experimental and theoretical study of the resonant properties and noise of a single cell of a receiving system based on cold-electron bolometers (CEB) with a double-folded slot antenna and coplanar lines. The system was designed to receive signals at 220/240 GHz frequencies with a 5% bandwidth. In measurements, we used the samples of the double-folded slot antennas with slot lengths of 162 um and coplanar line lengths from 185 to 360 um. Measurements of the resonance properties of CEB located at 0.3 K cryostat plate were carried out using a generator based on a high-temperature YBCO Josephson junction located inside the same cryostat at 4 K plate. This arrangement made it possible to obtain smooth amplitude-frequency characteristics with a clearly defined peak of a 15–21 GHz bandwidth at different frequencies. Based on these results, 2-D array of double-folded slot antennas with CEBs as 220/240 GHz LSPE channel prototype was calculated.The absorption efficiency of the array has reached 81% and 77% for 220 and 240 GHz channels, respectively.
Highlights
Introduction published maps and institutional affilCurrent work is aimed at the creation of a bolometric system with an antenna and an on-chip filter as an application in ultra-sensitive balloon-borne receiving systems for the study of cosmic microwave background radiation (CMB)—one of the important and actual issues of modern astronomy and cosmology
The generator chip consisted of 4 presents the results ofdipole an experimental study of theon resonant a Josephson integrated with antennas was mounted a holderproperties with a Si of cold-electron bolometers (CEB) with a double-folded slot antenna andoncoplanar lines. plate
The control magreceiving system at given frequencies, it is necessary to adjust the elements of the system, netic field, perpendicular to the Josephson junction boundary, was created by current in particular, theacapacity of the superconducting-insulatornormal metal (SIN)
Summary
Introduction published maps and institutional affilCurrent work is aimed at the creation of a bolometric system with an antenna and an on-chip filter as an application in ultra-sensitive balloon-borne receiving systems for the study of cosmic microwave background radiation (CMB)—one of the important and actual issues of modern astronomy and cosmology. The Large Scale Polarization Explorer (LSPE) [1] is an experiment of the Italian Space Agency for studying the polarization pattern of the B-mode of CMB. In this experiment, it is supposed to observe a signal at the central frequency of 145 GHz with a bandwidth of 30%, and at frequencies of 220 and 240 GHz (with a bandwidth of 5%). The 220 GHz and 240 GHz bands are ancillary frequency channels They are needed to eliminate the influence of cosmic dust radiation on the measurements of the CMB [2], giving the offset of the main channel. The main difficulty of this project is the creation of a two-channel system for frequencies of 220 GHz and 240 GHz with a small HPBW of 5%
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