Journal ArticleDOI
Quasi-optical antennas for radiometric remote-sensing
R.J. Martin,D.H. Martin +1 more
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TLDR
The requirements for, and the design of, quasi-optical antennas for radiometric remote-sensing are discussed with particular reference to the Advanced Microwave Sounding Unit AMSU-B, which was designed and built by Matra Marconi Space UK for the UK Meteorological Office and is due to be placed in orbit on a satellite.Abstract:
Millimetre- and submillimetre-wave radiometers are employed for remote-sensing of the Earth's atmosphere. They must operate in several widely-spaced frequency bands which together might exceed the fundamental bandwidth of a waveguide. A wholly independent radiometer for each band would be inefficient and considerable savings in space and weight can be achieved if all bands are received via a single aperture antenna and then separated by an optical demultiplexer, the arrangement comprising a `quasi-optical' antenna. This paper discusses the requirements for, and the design of, quasi-optical antennas for radiometric remote-sensing and illustrates this with particular reference to the Advanced Microwave Sounding Unit AMSU-B, which was designed and built by Matra Marconi Space UK for the UK Meteorological Office and is due to be placed in orbit on a satellite.read more
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Journal ArticleDOI
A survey on terahertz communications
Zhi Chen,Xinying Ma,Bo Zhang,Yaxin Zhang,Zhongqian Niu,Ningyuan Kuang,Wenjie Chen,Lingxiang Li,Shaoqian Li +8 more
TL;DR: A comprehensive literature review on the development towards terahertz communications and some key technologies faced in THz wireless communication systems are presented and several potential application scenarios are discussed.
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THz Frequency Selective Surface Filters for Earth Observation Remote Sensing Instruments
TL;DR: This new class of quasi-optical filter exhibits an insertion loss <;0.3 dB at 700 GHz and can be designed to operate independently of the polarization of the incident signals at oblique incidence.
Journal ArticleDOI
94 GHz Dual-Reflector Antenna With Reflectarray Subreflector
W. Hu,Manuel Arrebola,Robert Cahill,Jose A. Encinar,Vincent Fusco,Harold Gamble,Yu. Alvarez,Fernando Las-Heras +7 more
TL;DR: In this article, an offset parabolic reflector antenna which employs a reflectarray sub-reflector to tilt the focused beam from the boresight direction at 94 GHz is described, and numerical simulations are employed to demonstrate that the high gain pattern of the antenna can be tilted to a predetermined angle by introducing a progressive phase shift across the aperture.
Journal ArticleDOI
Second-Order Terahertz Bandpass Frequency Selective Surface With Miniaturized Elements
Amir Ebrahimi,Shruti Nirantar,Withawat Withayachumnankul,Madhu Bhaskaran,Sharath Sriram,Said F. Al-Sarawi,Derek Abbott +6 more
TL;DR: In this paper, a second-order frequency selective surface (FSS) made of miniaturized elements is proposed and designed for terahertz applications, which is composed of two layers of metallic arrays separated from each other by a polymer dielectric spacer.
Journal ArticleDOI
The research on 220GHz multicarrier high-speed communication system
Zhongqian Niu,Bo Zhang,Jiale Wang,Ke Liu,Zhi Chen,Ke Yang,Zhen Zhou,Yong Fan,Yaohui Zhang,Ji Dongfeng,Yinian Feng,Yang Liu +11 more
TL;DR: This paper presents the investigation into a 220 GHz multicarrier high-speed communication system based on solid state transceivers, which has eased the demand of high sampling rate analog-to-digital converter (ADC) by providing several signal carriers in microwave band and converting them to 220 GHz channel.