Showing papers by "Juan Luis Cano published in 2015"

Full-Band Air-Filled Waveguide-to-Substrate Integrated Waveguide (SIW) Direct Transition

Abstract: A 45% bandwidth in-line air-filled waveguide-to-substrate integrated waveguide (SIW) direct transition is designed to greatly improve the performance of existing configurations. The transition, based on a four-section height-stepped waveguide, includes a single-step widening transformer that enables full-band operation without using any dielectric probe. The absence of the probe reduces significantly the insertion loss and makes this transition simple, bandwidth controllable and easily scalable to the millimeter-wave frequency range. A back-to-back transition is designed to cover the 32–50 GHz band showing a return loss of 15 dB and a mean insertion loss of 0.68 dB in the whole bandwidth.

The thirty gigahertz instrument receiver for the Q-U-I Joint Tenerife experiment: Concept and experimental results

Abstract: This paper presents the analysis, design, and characterization of the thirty gigahertz instrument receiver developed for the Q-U-I Joint Tenerife experiment. The receiver is aimed to obtain polarization data of the cosmic microwave background radiation from the sky, obtaining the Q, U, and I Stokes parameters of the incoming signal simultaneously. A comprehensive analysis of the theory behind the proposed receiver is presented for a linearly polarized input signal, and the functionality tests have demonstrated adequate results in terms of Stokes parameters, which validate the concept of the receiver based on electronic phase switching.

The QUIJOTE experiment: project overview and first results

Abstract: QUIJOTE (Q-U-I JOint TEnerife) is a new polarimeter aimed to characterize the polarization of the Cosmic Microwave Background and other Galactic and extragalactic signals at medium and large angular scales in the frequency range 10-40 GHz. The multi-frequency (10-20~GHz) instrument, mounted on the first QUIJOTE telescope, saw first light on November 2012 from the Teide Observatory (2400~m a.s.l). During 2014 the second telescope has been installed at this observatory. A second instrument at 30~GHz will be ready for commissioning at this telescope during summer 2015, and a third additional instrument at 40~GHz is now being developed. These instruments will have nominal sensitivities to detect the B-mode polarization due to the primordial gravitational-wave component if the tensor-to-scalar ratio is larger than r=0.05.

The Thirty Gigahertz Instrument Receiver for the QUIJOTE Experiment: Preliminary Polarization Measurements and Systematic-Error Analysis.

Abstract: This paper presents preliminary polarization measurements and systematic-error characterization of the Thirty Gigahertz Instrument receiver developed for the QUIJOTE experiment. The instrument has been designed to measure the polarization of Cosmic Microwave Background radiation from the sky, obtaining the Q, U, and I Stokes parameters of the incoming signal simultaneously. Two kinds of linearly polarized input signals have been used as excitations in the polarimeter measurement tests in the laboratory; these show consistent results in terms of the Stokes parameters obtained. A measurement-based systematic-error characterization technique has been used in order to determine the possible sources of instrumental errors and to assist in the polarimeter calibration process.

The QUIJOTE experiment: project overview and first results

Abstract: QUIJOTE (Q-U-I JOint TEnerife) is a new polarimeter aimed to characterize the polarization of the Cosmic Microwave Background and other Galactic and extragalactic signals at medium and large angular scales in the frequency range 10--40 GHz. The multi-frequency (10--20 GHz) instrument, mounted on the first QUIJOTE telescope, saw first light on November 2012 from the Teide Observatory (2400 m a.s.l). During 2014 the second telescope has been installed at this observatory. A second instrument at 30 GHz will be ready for commissioning at this telescope during summer 2015, and a third additional instrument at 40 GHz is now being developed. These instruments will have nominal sensitivities to detect the B-mode polarization due to the primordial gravitational-wave component if the tensor-to-scalar ratio is larger than r=0.05.

A W-band polarimeter for radio astronomy applications: Design and simulation

Abstract: This contribution presents a W-band polarimeter designed for radio astronomy applications. The proposed scheme relays in a sub-harmonic mixer that minimizes the W-band hardware thus making the hardware design easier. The receiver functionality is analyzed theoretically and the design of the feed-horn, polarizer and orthomode transducer is shown in detail, comparing the simulated results with measurements where possible. Finally, the whole polarimeter is simulated in an ideal way and then introducing realistic data files in order to check the receiver functionality and the expected performance.