phased-array antenna


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phased-array antenna

phased-array antennaclick for a larger image
Phased array may be very simple, consisting of only two elements. Two examples of simple pairs of phased dipoles are shown in the illustration. On the left, two dipoles are spaced quarter wavelength apart in free space, and they are fed 90 degrees out of phase. This results in addition of phase in one direction and cancellation in the other. In this case, radiation pattern is unidirectional. However, phased array may have directional patterns with two, three, or even four different optimum directions. A bi-directional pattern can be obtained by spacing the dipoles at one wavelength and feeding them in phase as is shown in the illustration on the right.
An antenna that consists of a number of elements and in which the direction of the beam can be changed by varying the relative phase of the signal applied to each of these elements. The phased-array antenna scans electronically.
References in periodicals archive ?
Seeds, "Optically generated true-time delay in phased-array antennas," IEEE Trans.
Karmakar, "A Compact Photonic Bandgap Assisted Phased-array Antenna," Asia-Pacific Microwave Conference Proceedings, Seoul, South Korea, November 2003.
Commercial applications of phased-array antennas have been extensively studied over the last decade, principally in the case of vehicular antennas.
Flexible high-speed digital switching, amplifiers, and digital beamforming networks are critical to realize flexible phased-array antenna. M.
It had a large phased-array antenna and high power output.
It has a large phased-array antenna and high power output.
Chen, "Light weight and conformal 2-bit, 1 x4 phased-array antenna with CNT-TFT-based phase shifter on a flexible substrate," IEEE Transactions on Antennas and Propagation, vol.
The contract calls for production of a new type of solid-state electronic component for the radar, followed by construction of a modular active phased-array antenna. This two-phase approach is designed to provide proof of concept before launching prototype development and series production.
The existing N001 Cassegraintype antenna will be replaced with new Pero ("feather") passively scanned, phased-array antenna, developed by the NIIP Institute (Zhukovsky, Russia).
Topics: theory and applications of the measurement of antennas and radar scattering, advances in indoor and outdoor test ranges, measurement standards and laboratory comparisons, advances in near-field, far-field and RCS measurement techniques, new instruments for testing, data acquisition and processing methods, diagnostic methods, imaging techniques, phased-array antenna testing, and EMI/EMC/PIM chamber design, measurements and instruments.