Reflective array antenna

About: Reflective array antenna is a research topic. Over the lifetime, 4366 publications have been published within this topic receiving 57884 citations.

A dual-band, dual-polarized array element for Ka band satcom on the move terminals

Abstract: In this paper a radiating element to be used in dual band, dual polarized Ka band satcom application is presented. The radiator is based on an annular slot which is grounded with vias to form a coaxial structure. Two radiating elements operating around 20 GHz and 30 GHz are nested one into the other to form a dual band antenna. The radiator presents good performances and it is suited for array applications. In fact, it shows good isolation between bands and between polarizations and it makes possible to realize well isolated beam forming networks.

Performance Analysis of Corporate Feed Rectangular Patch Element and Circular Patch Element 4x2 Microstrip Array Antennas

Abstract: This paper present simple, slim, low cost and high gain circular patch and rectangular patch microstrip array antenna, with the details steps of design process, operate in X- band(8 GHz to 12 GHz) and it provides a mean to choose the effective one based on the performance analysis of both of these array antennas. The method of analysis, design and development of these array antennas are explained completely here and analyses are carried out for 4x2 arrays. The simulation has been performed by using commercially available antenna simulator, SONNET version V12.56, to compute the current distribution, return loss response and radiation pattern. The proposed antennas are designed by using Taconic TLY-5 dielectric substrate with permittivity, er = 2.2 and height, h =1.588 mm. In all cases we get return losses in the range -4.96 dB to -25.21 dB at frequencies around 10 GHz. The gain of these antennas as simulated are found above 6 dB and side lobe label is maintained lower than main lobe. Operating frequency of these antennas is 10 GHz so these antennas are suitable for X-band application.

VHF/UHF antenna pattern measurement with unmanned aerial vehicles

Abstract: The characterization of VHF and UHF antennas is very challenging owing to the very low-operative frequency. This paper presents a novel technique (originally developed for radio-astronomical applications) that can be suitable to measure ground-based aerospace antennas in real installation conditions, with an accurate and cost-effective method which does not require additional infrastructures. The system mainly consists of a micro Unmanned Aerial Vehicle (UAV), equipped with both a RF transmitter and an antenna, properly designed to operate as a far-field artificial test-source. Experimental results on a ground-based antenna at 50 MHz are provided. The extension of this technique to characterize service antennas (telemetry, remote control) onboard aerial vehicles is also reported. A measured pattern example of a 433 MHz telemetry monopole mounted on a commercial UAV is shown.

Antenna system for a forward looking SAR using digital beamforming on-receive-only

Abstract: This paper presents the development of an antenna system for a forward looking synthetic aperture radar (SAR) which uses digital beamforming (DBF) on-receive-only. One transmitting horn antenna is used in conjunction with 56 receiving patch subarrays all covering the same swath. The receiving antennas are sequentially switched which enables the antenna system to be operated by a conventional SAR receiver. The antenna system was built under contract from the DLR, Oberpfaffenhofen, Germany.

Multiband fractal antenna design for Cognitive radio applications

Abstract: Rapid development in wireless communication systems and an increase in the number of users of wireless devices is bound to result in spectrum shortage in the near future. The concept of Cognitive radio is envisaged to be a paradigm of new methodologies for achieving performance enhanced radio communication system through an efficient utilization of available spectrum. Research on antenna design is very critical for the implementation of cognitive radio. A special antenna is required in cognitive radio for sensing and communication purposes. This papers investigates the use of multiband fractal antennas for spectrum sensing application in cognitive radio units. The performance of a new fractal antenna design which generates four bands of operation in the range of 900-4000 MHz has also been studied. Through a thorough discussion on its return loss and radiation plots as well as other parameters such as gain and radiation efficiency, it is proved that the it is a promising antenna for future cognitive radio systems.