The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Optical and photonic techniques provide a unique capability to spatially process microwave and millimeter-wave signals in ways that will provide novel capabilities for broadband antenna array transmitter and receivers. Initial flight tests of such arrays for passive millimeter-wave imaging applications have proven successful and further work is expanding the capabilities of these arrays to RADAR and...
We present an “end-to-end optical” phased-array transmitter system concept, taking maximal advantage of the benefits inherent to photonics. Specifically, an ultra-widely tunable carrier signal generator, comprising a pair of offset injection-locked lasers, illuminates an array of photodiodes mounted directly at the feed points of an array of tightly coupled, wideband, low-gain antenna elements. Both...
In this paper we present an ultra-wideband optically addressed transmitting phased array antenna, consisting of ultra-wideband and tunable RF synthesizer, optically addressed phase feeding network, and high-speed photodetector integrated wideband antenna array. RF source generation and optical feed network are capable of cover the frequency range up to 50GHz. A set of 4×4 antenna arrays, such as horn...
In this paper we present an ultra-wideband optically addressed transmitting phased array antenna, consisting of ultra-wideband and tunable RF synthesizer, optically addressed phase feeding network, and high-speed photodetector integrated wideband antenna array. RF source generation and optical feed network are capable of cover the frequency range up to 50GHz. A set of 4×4 antenna arrays, such as horn...
An optically driven phased array with a novel optical feed network and an ultra-wideband down-conversion module is presented. The proposed technique successfully alleviates phase drift of signal in fibers, therefore allowing for an accurate control of phase in order to achieve beam steering. We also analyzed the excessive noise in the feed network which will lead to spurious beam when beam steering...
An optically addressed phase feed network for an ultra-wideband RF phased array is proposed. The architecture leverages recent advances in the development of optical RF source generation and coherent optical system in the fiber optics. By using polarization maintaining (PM) fibers two coherent optical tones can be encoded in two orthogonal states and transmitted to a high-speed photomixer at the antenna...
The architecture of an optically addressed ultra-wideband (2–40 GHz) phased array, based on microwave photonic down-conversion techniques, is described. For such a phased array, the transmitter module consists of an ultra-wideband antenna, photodiode, and power amplifier. A metamaterial-loaded Vivaldi antenna having a tailored, broad, flat-top radiation pattern and a broad impedance bandwidth is presented...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.