نتایج جستجو برای: electronically steerable parasitic array radiator espar
تعداد نتایج: 176445 فیلتر نتایج به سال:
Parasitic Layer-Based Reconfigurable Antenna and Array for Wireless Applications
We present a new concept for an electronically tunable diode laser. It is based on an external-cavity configuration with simultaneous feedback and intracavity spatial separation of the laser's spectral components. The electronical tunability is achieved by insertion of a liquid-crystal array as an electronically controlled aperture into the region of spatial separation of the spectral component...
Novel acousto-optic processors for control and signal processing in phased-array antennas are presented. These processors can operate in both the antenna transmit and receive modes. An experimental acousto-optic processor is demonstrated in the laboratory. This optical technique replaces all the phase-shifting devices required in electronically controlled phased-array antennas.
MESSENGER's high-data-rate downlink will use the first electronically scanned phased-array antenna for a deepspace telecommunication application. Measured results for the lightweight phased-array antenna and the highefficiency Solid State Power Amplifiers (SSPAs), developed by JHU/APL, are presented. Two functional amplifiers within the X-band SSPAs provide output power that is scalable from 11...
The paper introduces two newly developed smart antennas, ESPAR antenna and ESMB antenna, for mobile wireless computing terminals and mobile stations. The configurations of these smart mobile terminal antennas at the operating frequency approximately over 2.4GHz are illustrated and the applications of using these smart antennas at mobile computing terminals and mobile stations are proposed. The ...
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