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: It is shown that the use of Fermatn's spiral as a template for the antenna array leads to similar results in terms of sidelobe level and bandwidth as those obtained by computationally expensive non-linear optimization methods.
Abstract: We propose an aperiodic antenna array to suppress secondary radiation lobes in widely spaced arrays. We show that the use of Fermatn’s spiral as a template for the antenna array leads to similar results in terms of sidelobe level and bandwidth as those obtained by computationally expensive non-linear optimization methods. Furthermore, by maintaining the distances between neighbors approximately constant, the increase in array footprint is kept approximately within 25% of an equivalent periodic array, a key feature for space-constrained applications. Based on the straightforward computation of our method, we are able to present the results for arrays varying from 4 to 2048 elements and minimal spacing between the antennas up to ten wavelengths.
26 citations
Patent•
06 Apr 2000TL;DR: In this paper, a method of producing antennas and antenna arrays with desired beam widths applies to both single and dual polarization antennas, and controls and modifies the radiation patterns of the antenna's radiating elements by placing appropriately designed parasitic elements in their vicinity.
Abstract: The method of producing antennas and antenna arrays with desired beam widths applies to both single and dual polarization antennas, and controls and modifies the radiation patterns of the antenna's radiating elements by placing appropriately designed parasitic elements in their vicinity.
25 citations
Book•
01 Aug 1995
TL;DR: In this paper, the requirements of an antenna for EMC main characteristics of antennas are discussed, as well as basic trigonometry powers, indices, and logarithms real and complex numbers scalars and vectors Fourier analysis and transforms parameters fundamental units and dimensions.
Abstract: Part 1 Introduction to antennas: requirements of an antenna for EMC main characteristics of an antenna. Part 2 Basic mathematics for EMC engineers: angles basic trigonometry powers, indices, and logarithms real and complex numbers scalars and vectors Fourier analysis and transforms parameters fundamental units and dimensions. Part 3 Antenna theory: unit vectors scalar and vector fields Maxwell's equations boundary conditions fields due to a radiating dipole power flux density for a plane wave wave impedance for a plane wave radiation resistance far field of antennas. Part 4 Antennas for frequencies below 1 MHz: mechanism of radiation near and far fields of antennas wave impedance difference between receive and transmit antennas small antennas baluns radiation power factor matching antennas effective length and effective height E field antennas H field antennas. Part 5 Antennas for frequencies between 1 MHz and 1 GHz: resonant monopoles discone cavitenna resonant and large dipoles folded dipoles triangular dipoles biconical Yagi-Uda frequency independent (FI) antennas log periodic antenna bilog helical antennas large and resonant loops double-ridged horns. Part 6 Antennas for frequencies above 1 GHz: band theory log spiral archimedes spiral microstrip planar spiral discone antenna double-ridged horns. Part 7 Calibration of antennas: gain calculation of gain antenna correction factor. Part 8 List of acronyms and abbreviations: useful tables and conversion factors.
25 citations
TL;DR: The conductor shapes of the proposed shorted patch antennas maximize the length of the current path for a given area thereby significantly reducing the resonant frequency of the antenna.
Abstract: We present two electrically small printed antennas suitable for mobile communication handset terminals. The conductor shapes of the proposed shorted patch antennas maximize the length of the current path for a given area thereby significantly reducing the resonant frequency of the antenna. Reductions in operating frequencies of the order of seven to ten have been achieved.
25 citations
09 Jun 2013
TL;DR: This paper investigates the use of virtual antenna arrays at the receiver to do single antenna direction-of-arrival estimation using a high resolution SAGE algorithm, and shows that the direction of arrival can be estimated with a reasonable accuracy in an indoor environment.
Abstract: In this paper, we have investigated the use of virtual antenna arrays at the receiver to do single antenna direction-of-arrival estimation. The array coordinates are obtained by doing simple dead reckoning using acceleration and angular speed measurements from a low cost micro-electro-mechanical system inertial measurement unit (IMU). The proposed solution requires no extra hardware in terms of receiver chains and antenna elements. Direction-of-arrival estimation results are obtained using a high resolution SAGE algorithm. Measurement results show that the direction-of-arrival can be estimated with a reasonable accuracy in an indoor environment.
25 citations