Photoconductive THz Sources Driven at 1550 nm

Brown, E. R.; Globisch, Björn; Barrio, Guillermo Carpintero del; Rivera, Alejandro; Segovia-Vargas, D.; Steiger, Andreas

doi:10.1002/9781119460749.ch3

Cited by 1 publication

(1 citation statement)

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“…Figure 3.1 summarizes the working principle of the AE showing the electric field for the two input optical signals and the output THz signal. By default, the BW of the photomixer itself is so wide due to the ultra-fast nature of its impulse response function [94]. This is the reason that usually, the antenna of the AE is a self-complementary one to be able to cover a wide frequency range which is required for most of the THz applications [95].…”

Section: Introductionmentioning

confidence: 99%

Effect of Metal Resistive Losses on the Gain of a THz Planar Spiral Antenna

Brown

Abdalmalak

Zhang

2020

2020 14th European Conference on Antennas and Propagation (EuCAP)

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We are living in interesting times for astronomy science, since the birth of the radio astronomy field in the 20th century by Karl Jansky, the availability of new and better radio astronomy receivers is in increasing demand to push the human understanding of the universe. In this thesis, various components (antennas, baluns, antenna-arrays, and radiometers) are proposed for radio astronomy receivers. The proposed designs are belonging to three receiver topologies (direct detection, down-conversion, and up-conversion) that operate at different frequency bands from MHz up to a few of THz. Also, to demonstrate that the same proposed design is capable of working efficiently at different operating frequencies, multiple adjusted designs are presented for several practical radio astronomy and space applications.Firstly, a receiver based on the direct detection of the Electromagnetic (EM) radiation through a radio telescope working on cryogenic cooling conditions. In this part, the focus is on designing conical log-spiral antennas and baluns (balanced to unbalanced transformers) to be used as feeds for VLBI Global Observing System (VGOS) ground-based radio telescopes. The feeds cover the Ultrawideband (UWB) from 2 GHz to 14 GHz with Circular Polarization (CP) radiation and stable radiation patterns. After integration of the feeds to the radio telescope, the whole system operates with high aperture efficiency and high System Equivalent Flux Density (SEFD) over the whole required wide range. The fabrication, assembly, and measurements for single-element and four-elements array are provided for achieving the requirements for single CP and dual CP operation. Also, in the same first part, the proposed single-element feed (antenna + balun) is readjusted for being used for CryoRad spaceborne Earth observations. This feed has a single CP over low-frequency UWB from 400 MHz to 2 GHz with low weight and physical size compared to standard horn feeds.

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Section: Introductionmentioning

confidence: 99%