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.

Optimum Partitioning of a Phased-MIMO Radar Array Antenna

Abstract: In a phased-multiple-input-multiple-output radar, the transmit antenna array is divided into multiple subarrays that are allowed to be overlapped. In this letter, a mathematical formula for optimum partitioning scheme is derived to determine the optimum division of an array into subarrays and number of elements in each subarray. The main concept of this new scheme is to place the transmit beam pattern nulls at the diversity beam pattern peak sidelobes and place the diversity beam pattern nulls at the transmit beam pattern peak sidelobes. This is compared to other equal and unequal schemes. It is shown that the main advantage of this optimum partitioning scheme is the improvement of the main-to-sidelobe levels without reduction in beam pattern directivity. Also, signal-to-noise ratio is improved using this optimum partitioning scheme.

Microwave WPT to a rover using active integrated phased array antennas

Abstract: The high power transmitter active integrated phased array antenna and the rectenna array for the microwave wireless communication and power transmission are demonstrated at 5.8 GHz. The 4 W high power GaAs FET amplifier was developed for the transmitter antenna with the total power of 120 W. The average distance to the rover was 2.5 m. The active integrated phased array antenna with the beam steering function was operated with the 4-bit digital phase shifter by the thin LTCC substrate. In this array, the MSK modulation with the AB-class operation by the high power amplifier was adopted and obtained the BER of 10-6.

Antenna topics in my experience

Abstract: A brief account of some concepts and developments in my experience with antennas is presented under three headings: A-wide-band matching to a long line; B-small antennas; C-planar arrays. They cover the half-century from 1935 to date.

Phased-array radars

Abstract: We all know what a radar antenna looks like—a circling dish. Phased array radars, however, can scan a third of the sky or more without moving at all

Azimuth array of rotory antennas with selectable lobe patterns

Abstract: A radio transmission antenna system and method of transmitting radio signals. The antenna system includes an array of separately rotatable directional antennas which are spaced along an azimuth line. The antennas are rotated to direct their respective major lopes of transmitted rf energy along parallel lines in a selected direction relative to the azimuth line. Two separate adjustments are made to the phase of identical rf signals which are fed to each antenna in the array. A first phase adjustment is made when required to produce a coherent wave-front transmitted in the selected direction. This first phase adjustment shifts the phase of the signals fed to adjacent antennas in the array by 180°. This adjustment establishes a radiation pattern in any given azimuth quadrant which records major lobes, established by rotating the antennas, at 0° and 90° relative to the azimuth line and at least one intermediate angle between 0° and 90°. The second adjustment changes the phase of the signals fed to antennas which are spaced equally from the geographic center of the array by equal, opposite magnitudes. This second adjustment electrically wobbles the direction of the major lobe on either side of the direction established by the first adjustment. A method of operating the above-described array includes the steps comprising the spacing and phase adjustments described above.