Desfasador diferencial 90º compacto de banda ancha en guía de onda

A compact differential phase shifter structure that exhibits a full-band operation and easy mechanical manufacture is presented. It consists of a rectangular waveguide loaded with continuous senoidal ridge section and corrugations. A prototype of 90º differential phase shifter with reference to an empty waveguide of the same length was designed and tested for the WR22 waveguide band. Moreover, manufacturing tolerances have been taken into account in order to analyse the impact in the electrical performance. The differential phase shifter reveals an excellent behaviour with an average phase shift of 88º ± 3°, return losses better than 20 dB and insertion losses better than 0,1 dB over a 50% bandwidth (30-50 GHz)

Four-state full Q-band phase shifter using smooth-ridged waveguides

A novel four-state full Q-band waveguide phase shifter based on smooth-ridged sections is presented. The waveguide structure combines differential 90° and 180° phase shifters, whose combination provides the four-phase states (0°, 90°, 180°, and 270°) by appropriately controlling a set of millimeter-wave switches. Each differential phase shifter is performed using an E-plane continuous profile ridge to reach the 90° or 180° phase shift, respectively. The phase shifter module provides outstanding performance covering the full Q-band (33-50 GHz) with average phase results of 93.5°, 182.8°, and 270.6°.This work was supported by the Spanish Ministry of Economy and Competitiveness through the Consolider-Ingenio 2010 Program under Grant CSD2010-00064 and Grant ESP2015-70646-C2-2-R

Conmutador de fase de 4 estados en la banda de frecuencias de 35 a 47 GHz

This document describes the design of a phase switch with four states intended for a radio astronomy receiver which operates in the 35-47 GHz frequency band. The phase switch has two microwave branches which are combined by a Wilkinson divider/combiner. Each branch is based on a 180º phase switch connected in cascade with a different band-pass filter. The phase shift between the two band-pass filters is 90º. The switching devices are microwave PIN diodes. Experimental results have shown average phase shift values of 178º and 87.3º within the operation band for the phase switch and the bandpass filters respectively. The complete phase-switch have been validated by simulations of the cascaded elements including the Wilkinson combiner/divider

Módulos de conmutación de fase de 4 estados en banda Q para radioastronomía

Two greater than 30% relative bandwidth phase shifters with four phase states are designed to be integrated in a radio astronomy receiver at Q-band. Two different circuit topologies are presented in order to fulfil requirements. The first circuit is based on planar structures and PIN diodes, while the second design is based on waveguide phase shifters and SPDT MMICs. The planar circuit consists of two 90º out-ofphase microwave phase-shifting branches which are combined by Wilkinson power dividers; each branch is composed of a 180º phase shifter and a band-pass filter. The waveguide solution is based on cascaded 180º and 90º individual phase shifters. Both designs have been manufactured and their experimental characterization have shown significant results, making them suitable for being part of a radio astronomy receiver.Este trabajo ha sido financiado por el Ministerio de Economía y Competitividad bajo el programa CONSOLIDER-INGENIO 2010 referencia CSD2010-00064

Modelado con la temperatura de diodo Schottky para conmutador de fase 90º

This work describes the modelling of a Schottky diode at room (300 K) and cryogenic (15 K) temperatures for its use in a 90º phase switch working in the Ka-band. The phase switch is based on the combination of filters as phase shifting branches and a single-pole double-throw (SPDT) switch with Schottky diodes as switching devices. The MA4E2037 Schottky diode is used as switching device and its small signal model is obtained over the temperature. The design of the phase switch is performed in a 254-m thick alumina substrate, showing an average phase shift of 91.05º±5º over the 26-36 GHz band with an amplitude imbalance of 0.3 dB at room temperature. At cryogenic temperatures, the phase switch shows an average phase shift of 88.5º±9º over the 26-36 GHz band with an amplitude imbalance of around 0.1 dB.Este trabajo ha sido financiado por el Ministerio de Economía y Competitividad bajo el programa CONSOLIDER-INGENIO 2010 referencia CSD2010-0006

Multi-pixel Ka-band radiometer for the QUIJOTE experiment (Phase II)

This paper presents the configuration of the Ka-band radiometer developed for the Phase II of the QUIJOTE radio astronomy experiment, as well as the design of the different subsystems involved in the instrument. The new configuration, consisting of around 30 modified receivers working in the 26 - 36 GHz band, avoids the need of a rotating polar modulator at cryogenic temperatures, which is a source of mechanical and thermal difficulties. Moreover, the larger number of receivers will increase the instrument sensitivity. These two aspects are a clear advantage over the receiver developed for the experiment Phase I. The present paper also gives detailed information of some designed subsystems such as the feedhorn, the polarizer, the orthomode transducer, the cryogenic low-noise amplifiers and the back-end module.This work has been funded by the Ministerio de Ciencia e Innovación (Spain) under Astronomy and Astrophysics research programme, reference AYA2010-21766-C03-03, and the FPI grant BES-2011-046199

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

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

Characterisation system for passive microwave components

Ingeniería técnica de Telecomunicació