Patent
Compact antenna range with switchable electromagnetic mirror
TLDR
In this article, a planar reflector which is controllable between a reflective condition and a transmissive condition is placed parallel to a second planar reflective reflector, and a pulse of electromagnetic energy is injected into the space between the reflectors.Abstract:
A compact electromagnetic antenna pattern range includes a planar reflector which is controllable between a reflective condition and a transmissive condition. The controllable reflector is placed parallel to a second planar reflector, and a pulse of electromagnetic energy is injected into the space between the reflectors, propagating toward one of the reflectors. After a number of re-reflections, the controllable reflector is rendered transmissive and a substantially planar wavefront is made available for application to the antenna under test.read more
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Patent
Quasi-optical transmission/reflection switch and millimeter-wave imaging system using the same
TL;DR: In this article, an apparatus for the selective transmission or reflection of incident electromagnetic radiation is described. But the apparatus is not controllable between a reflection mode and a transmission mode, where in the reflection mode the diodes are reverse-biased and electromagnetic radiation incident on the apparatus was substantially reflected and in the transmission mode the Diodes were forwardbiased and transmitted substantially.
Patent
Electromagnetically anechoic chamber and shield structures therefor
Katsuo Ishihara,Yoshio Tomiyama +1 more
TL;DR: In this paper, an electromagnetically anechoic chamber for EMC (Electromagnetic Compatibility) tests of electronic devices is described. And the floor, ceiling and side wall have panels of electromagnetic wave absorber having many ferrite tiles, and shield members comprising double layered shield members of copper sheets and iron sheets for absorbing and reflecting the foreign electromagnetic wave.
Patent
Position determining apparatus and position determining method using the same
TL;DR: In this article, a position determining apparatus consisting of a transmitter and a receiver connected to the transmitter through a cable with a predetermined length is presented, where a distance detector calculates the relative positions of the transmitter and the receiver based on the propagation time of the electromagnetic wave pulses received by each receiving antenna.
Patent
Compact antenna test range
TL;DR: In this paper, a test range for performing antenna and/or radar cross-section measurements is proposed, which consists of transmitting means (1) for transmitting an electromagnetic wave, transducer means for converting the wavefront transmitted by the transmitting means to a plane wave, and a piece (5) to be tested, located in such a way that the plane wave to be obtained from the transducers hits it.
Patent
Sparse numerical array feed for compact antenna and RCS ranges
Douglas P. Morgan,James D. Doty +1 more
Abstract: Systems and methods enable numerically creating a flat field in a compact radar range with a curved reflector, and without use of a separate phased array of elements, at frequencies lower than those that are possible with currently known, reflector-only compact radar ranges. A compact radar range is calibrated to enable weighting factors to be computed. The weighting factors may be computed by performing an optimization algorithm. The weighting factors are used to weight separate target signals sequentially returned from a target zone such that, when combined, a numerically composite measurement has a substantially constant magnitude across the target zone.
References
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Patent
Method and apparatus for determining near-field antenna patterns
Peder M. Hansen,John W. Rockway +1 more
TL;DR: In this paper, a cost-effective and practical technique for obtaining far-field patterns of complex radiating or receiving structures such as ships, aircraft, or shore site antennas is proposed.
Patent
Phase-corrected waveguide power combiner/splitter and power amplifier
TL;DR: In this paper, a sectoral parabolic reflector is oriented with its focus at a port of the common waveguide with its axis parallel with the axes of the waveguides of the array for reflecting signals from the focal point to create a locus of constant phase at the ports of the Waveguide array.
Patent
Electronically steered antenna system using a reflective surface formed of piezoelectric transducers
TL;DR: In this paper, the phase of the reflected waves depends upon the spacing of the reflective surfaces from the panel, and a change in this spacing is provided by electrical control signals being applied to the piezoelectric transducers.