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: In this paper, the authors describe the algorithms and equipment used to apply near-field scanning techniques to the phase alignment of phased-array antennas, which achieves a level of precision not previously available.
Abstract: This paper describes the algorithms and equipment used to apply near-field scanning techniques to the phase alignment of phased-array antennas. This procedure achieves a level of precision not previously available. The electronic scanning property of the antenna is used to bring different sections of the antenna spectrum within range of the near-field scanning process. These partial spectra are then merged to define the entire spectrum of the antenna. This process provides the resolution needed to determine the excitation at individual elements by the inverse Fourier transformation operation. The process described here has been used in the production of a very large number of phased-array antennas currently in service.
40 citations
TL;DR: The investigated antennas were designed, fabricated, and subjected to the measurements in both steady and transient states to determine their suitability for operating in a wireless system as a time-modulated linear array.
Abstract: This paper concerns the study of the mm-wave reconfigurable antennas based on S-PIN diodes suitable for using in mm-wave communication systems The investigated antennas were designed, fabricated, and subjected to the measurements in both steady and transient states One selected antenna was incorporated into a wireless system to determine its suitability for operating in such a system as a time-modulated linear array By means of appropriate switching of the antenna, multiple radio frequency (RF) chains were simulated in a receiver having only one RF chain This allowed applying a combining technique for improving the system performance in a presence of a strong interfering signal
39 citations
25 Nov 2001
TL;DR: A closed-form expression is derived for the fading correlation function of a uniform circular array (UCA) that is a function of antenna spacing, array geometry, as well as the distribution of angle of arrival (AOA).
Abstract: In this paper, we derive a closed-form expression for the fading correlation function of a uniform circular array (UCA). The fading correlation for a UCA is a function of antenna spacing, array geometry, as well as the distribution of angle of arrival (AOA). Comparative results on the fading correlation function for both the uniform linear array (ULA) and the UCA are given. Computer simulations are carried out to verify the analytical results.
39 citations
Patent•
06 Oct 2008TL;DR: In this article, a generalized non-limiting embodiment of a dipole antenna and a half-slot antenna with three mutually perpendicular radiating elements is presented. But the results for the diversity performance and the MIMO channel capacity are not analyzed.
Abstract: Generalized non-limiting embodiments include employing a dipole antenna and/or a half slot antenna. Each of the antennas constitutes three mutually perpendicular radiating elements to achieve good isolation and low antenna signal correlation between the three ports. In one generalized non-limiting embodiment the antennas are fabricated on FR-4 epoxy boards. Experimental results show that the antennas resonate a reasonable frequency and have a desired mutual coupling. In addition experimental results for the diversity performance and the MIMO channel capacity are also provided for these antennas and these results show that the herein described antennas offer good diversity gain and the channel capacity can be increased by as much as three times by using these antennas over conventional antennas.
39 citations
TL;DR: The mutual impedance between antenna elements in the remote array and the correlation between the signal and noise fields received by these elements are analyzed for their impact on the channel capacity achievable by such arrays.
Abstract: Space-time coding techniques can be used to achieve very high spectral efficiencies in highly scattering environments using multiple transmit and receive antennas. At the remote station, there is usually a more limited space allotted to the antenna array than at the base station. Since the spectral efficiency improves with the number of antennas, one is interested in how many antennas can be crammed into the limited space on the remote station. This paper (Part I of II) addresses some of the issues which affect the allowable density of antennas in the remote station. In particular, the mutual impedance between antenna elements in the remote array and the correlation between the signal and noise fields received by these elements are analyzed for their impact on the channel capacity achievable by such arrays. In particular, we assume the transmitter is radiating from nT elements of uncoupled half-wave dipoles and knows nothing of the channel. A formula is given for the maximum channel capacity to a receiving array of nR elements, coupled to each other in the presence of ambient noise or interference with a uniform angle of arrival distribution. This formula neglects amplifier noise in the receivers. It is shown that the channel capacity is already determined at the terminals of the receiving array, and can not be improved by internal coupling networks following the receiving array. When the propagation is by means of full three-dimensional scattering, the channel capacity is unaffected by mutual coupling in the receiving array
39 citations