Two potential MMA antenna designs are compared with respect to sensitivity, polarization purity, field-of-view and sidelobe level. Under conditions of very low atmospheric opacity and receiver noise temperature the offset reflector design has better sensitivity than the minimum blockage conventional design at about the 10% level. The offset design has poorer performance than the conventional de...

This article proposes an approach to increase the efficiency of the U-shaped cross section antenna. The Optimization of a wideband U-shaped cross section antenna on a U-shaped ground plane is presented suitable for WLAN in various applications. The proposed antenna has been developed from a single element of U-shaped cross-sectional antenna. A single element is easy to be composed for installin...

Because of special structure, a dual reflector antenna has beam rotation capability in azimuth and elevation directions. In this structure, the antenna beam can be placed in any point in the space by mechanical movement of twist reflector which it is the most important ability of the antenna. Due to the antenna structure, if the polarization of incident wave is linear, it is expected that the p...

Measurements of the antenna patterns for the high frequency component of the Advanced Microwave Sounding Unit (AMSU-B), to fly on the NOAA-KLM polar orbiting satellites, are reported here. They were made on the Compact Antenna Test Range at Queen Mary and Westfield College, London, at three frequencies within the AMSU-B receiver's channels, centered at 89, 150, and 183.31 GHz. The main reflecto...

In this paper the problem of synthesis of offset shaped single reflector antenna is considered. This problem has to be solved when a reflector antenna system is required to control the field amplitude and/or phase on the far-field or on the output aperture in the near-field. Achieving high efficiency is a very important objective of the design and shaped reflector antennas are used for that pur...

This paper presents the switched-beam slot antenna over the electromagnetic band-gap (EBG) reflector. This antenna is composed of two slot elements fed with phase difference and the EBG reflector, which is applied in order to realize the low profile structure. The radiation characteristics of this antenna are calculated using the FDTD method. The calculated results show that the antenna height ...