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.
Papers published on a yearly basis
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TL;DR: In this article, basic principles of operation of plasma antennas based on volume and surface plasma waves are presented, and it is demonstrated that the efficiency of the plasma antennas does not yield to that of metal antennas and that the controllability and radar invisibility are significantly higher.
Abstract: Basic principles of operation of plasma antennas based on volume and surface plasma waves are presented. It is demonstrated that the efficiency of plasma antennas does not yield to that of metal antennas and that the controllability (frequency tuning for reception and transmission) and radar invisibility (a small radar cross section) are significantly higher. Plasma antennas of two types are considered: dipole antennas operating based on the surface plasma wave, and slotted waveguide antennas operating based on the volume plasma wave.
17 citations
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TL;DR: In this article, the authors studied the antenna loss and receiving efficiency for single and multi-array antennas and focal plane phased array feeds, and they showed that the array antenna loss can be significantly increased by mutual coupling, particularly for beams with a large scan angle.
Abstract: For phased arrays used in satellite communications and radio astronomy, high sensitivity is required, and minimizing antenna losses is critical. Losses for single antennas can be minimized using high conductivity materials. It is less well understood that loss for array antennas is also influenced by mutual coupling between array elements and the beamformer weights applied to the signal from each element. In this paper, we study the antenna loss and receiving efficiency for phased array antennas and focal plane phased array feeds. To better elucidate the physics of array antenna loss related to mutual coupling and beamformer weights, losses for a coupled array can be lumped into an array effective resistance similar to the loss resistance of an equivalent single antenna. Numerical results show that although the antenna loss for a single isolated array element is low, the array antenna loss can be significantly increased by mutual coupling, particularly for beams with a large scan angle.
17 citations
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TL;DR: The general characteristics of radars using large planar steerable array antennas are discussed in this paper, where the need for an amplifier for each element is shown, and the tolerances and stability requirements for the amplifiers are discussed.
Abstract: The general characteristics of radars using large planar steerable array antennas are discussed. The need for an amplifier for each element is shown, and the tolerances and stability requirements for the amplifiers are discussed. Array geometry, pattern formation and gain, mutual coupling, and beam-steering techniques are summarized. Element minimization and signal-processing techniques are analyzed.
17 citations
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07 Aug 2002TL;DR: In this paper, the advantages and drawbacks of cylindrical and spherical microstrip array antennas in terms of electrical performance and mechanical setup are discussed, and measured results for aperture coupled microstrip patch arrays on cylinear and spherical surfaces.
Abstract: An increasing number of complex and dedicated antennas in automotive systems, mobile communication and spaceborne and airborne applications require conformal integration. The term conformal antennas stands for antennas which are confined to the surface of the mechanical carrier. In addition to aerodynamical, aesthetic or integration features, conformal antennas can provide special antenna pattern requirement by an appropriate geometrical form. This contribution discusses the advantages and drawbacks of cylindrical and spherical microstrip array antennas in terms of electrical performance and mechanical setup. It further outlines the design of these antennas and shows measured results for aperture coupled microstrip patch arrays on cylindrical and spherical surfaces.
17 citations
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17 citations