An array of lens-coupled antennas for cosmic microwave background measurements in the 30 Ghz band
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An array of bow-tie slot antennas coupled through an extended hemispherical lens is proposed to operate in the 30 GHz frequency band. The design includes a combination of three microstrip Wilkinson power dividers (WPD) and transitions to coplanar wave guides (CPW) to form the feeding antenna network. This configuration is suitable for the integration with heterodyne imaging detectors commonly used in radioastronomy. Measurements and simulation results exhibit a frequency range of operation from 20 to 40 GHz with a bandwidth of 24% achieved for −10 dB return loss at the central frequency. The measured radiation patterns show a maximum peak gain of around 13 dB with HPBW of 10° for the E-plane, and whose first side lobes are lower than 13 dB below the main lobe in both angular shift sides. The presented results will be considered as preliminary feasibility studies in the 30 GHz QUIJOTE-CMB Instrument, which is designed to study the anisotropies of the Cosmic Microwave Background (CMB).
KeywordsBow-tie slot antenna Antenna-coupled Lens Cosmic microwave background (CMB)
The author is grateful to the technicians: Eva Cuerno, Ana Rosa Pérez, Santiago Cembellín, and Fernando Gómez for their contributions during the fabrication process. This work was supported by the Spanish “Ministerio de Ciencia e Innovacion” through the projects ESP2004-07067-C03-01 and AYA2007-68058-C03-02.
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