Topic
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.
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TL;DR: This study shows that a curved ground plane improves the radiation patterns at broadside and further reduces the antenna height, which ultimately validates the proposed design technique.
Abstract: A novel design of a low-profile wideband monopolar antenna is proposed with integration examples for vehicles and helmets. Initially, a monopolar antenna size is reduced by adding four symmetrical tapered slots on an edge-shorted patch. The antenna is first designed to be integrated onto a large flat ground plane that is applicable for vehicular installation. This design is later adapted for integration onto a helmet with a finite-curved ground plane, where the helmet material is included as part of the design. This study shows that a curved ground plane improves the radiation patterns at broadside and further reduces the antenna height. Both vehicle and helmet antennas have been optimized to operate in a wide frequency range from about 800–2300 MHz. These antennas radiate in a monopole-like pattern with vertical polarization and high radiation efficiency that makes them suitable for transmission applications. Good agreement between simulation and measurement is obtained, which ultimately validates the proposed design technique.
51 citations
08 Jul 2001
TL;DR: In this paper, the authors proposed a layered lens antenna for high-gain antennas, which can transform a spherical wave emanating from a feed into a collimated beam (plane wave), with the advantage that the space-fed array surface can have almost any shape including a plane.
Abstract: Reflectors are the most commonly used antennas in high-gain applications. Although very efficient radiators, they require highly accurate curved reflecting surfaces that are often cumbersome to implement. Consequently, alternatives have been investigated. Space-fed arrays are particularly relevant to this work. As in a reflector, these structures transform a spherical wave emanating from a feed into a collimated beam (plane wave), with the advantage that the space-fed array surface can have almost any shape, including a plane. However, since reflection-type space-fed arrays (e.g., reflectarrays) require the same surface accuracy as a reflector, a transmission type space-fed array (e.g., a layered lens antenna) is often a more desirable alternative. A preliminary design procedure, theoretical analysis and an 8.421 GHz layered lens prototype are presented. The theoretical analysis is based on a full-wave treatment of plane wave transmission through a uniform infinite array of elements. The prototype lens was designed for maximum gain and minimum number of layers (three). Although the presented material is preliminary, it clearly indicates that layered lenses are good candidates for high-gain antennas.
51 citations
TL;DR: In this article, a multiline progressive PET phase shifter with a low perturbation loss of 2 dB and a total loss of less than 4 dB up to 40 GHz with a maximum phase shift of 480
Abstract: A new phased array antenna of wide bandwidth and good beam scanning angle has been developed using a low cost multiline phase shifter controlled by a piezoelectric transducer (PET) and a stripline fed Vivaldi antenna array. The multiline progressive PET phase shifter has a low perturbation loss of less than 2 dB and a total loss of less than 4 dB up to 40 GHz with a maximum phase shift of 480/spl deg/. The proposed phased array antenna consists of four E- or H-plane Vivaldi antennas, a PET phase shifter, and a power divider. The phased array shows a wide beam scanning capability of /spl plusmn/27/spl deg/ over a wide bandwidth from 8 to 26.5 GHz covering X, Ku, and K bands.
50 citations
08 Jun 1994
TL;DR: The use of antenna arrays in a random frequency hopping GSM system is treated and receiver/transmitter structures are described and results from simulations and propagation measurements are presented and compared with theoretical results.
Abstract: This paper summarizes some of the antenna array work at Ericsson. The use of antenna arrays in a random frequency hopping GSM system is treated and receiver/transmitter structures are described. Results from simulations and propagation measurements are presented and compared with theoretical results. >
50 citations
TL;DR: In this article, a novel phased array antennas suitable for X-band satellite communication are introduced and investigated for right-handed circular polarization (RHCP) in a multi-layered fabrication.
Abstract: Novel phased array antennas suitable for X-band satellite communication are introduced and investigated for right-handed circular polarization (RHCP) in a multi-layered fabrication. The primary function of the proposed antennas is to transmit high quality data obtained from satellites and the ground station systems with the lowest amount of loss. For accurate data transmission, the important parameters regarding antenna specifications and electrical performance are the antenna gain and the high-purity polarization. Hence, this paper describes novel procedures for gain enhancements of the array antennas working at X-band (from 8.0 to 8.5 GHz) with an RHCP characteristic, including a single element, 2×2 array, and 2×4 array with four-way and eight-way power dividers, respectively. Taking into consideration the long-distance communication between a satellite and ground station, a substrate-integrated waveguide structure has been proposed, in particular because it is known to have low radiation loss and a low weight comparable to that of a microstrip, as well as low material loss similar to that of a metal-surrounded waveguide.
50 citations