rectenna वाक्य
उदाहरण वाक्य
मोबाइल
- The helicopter carried a rectifying antenna or " rectenna " array incorporating thousands of diodes to convert the microwave beam into useful electrical power.
- A " pilot " microwave beam emitted from the center of the rectenna on the ground establishes a phase front at the transmitting antenna.
- This was tested in a ground-to-ground experiment in 1975, and as part of this they developed lightweight versions of the rectenna.
- While traditional ( radio-and microwave ) rectennas are fundamentally similar to optical rectennas, it is vastly more challenging in practice to make an optical rectenna.
- It is possible to build a solar cell identical to a radio, a system known as an optical rectenna, but to date these have not been practical.
- In 1982, Brown and James Trimer ( of NASA ) announced a new version of the rectenna using printed circuit techniques that reduced the weight by ten times.
- While rectennas have long been used for radio waves or microwaves, an optical rectenna would operate the same way but with infrared or visible light, turning it into electricity.
- The 1964 demonstration received a good deal of publicity, but nothing came of it, since enthusiasm for Earth satellites was very high and the rectenna system was heavy and inefficient.
- However, in the 1970s, NASA became interested in beamed power for space applications, and, in 1982, published a design for a much lighter and cheaper rectenna system.
- The collecting satellite would convert solar energy into electrical energy on board, powering a microwave transmitter or laser emitter, and focus its beam toward a collector ( rectenna ) on Earth's surface.
- In September 1982 the Department of Communications gave the go-ahead to form a formal study group within the CRC, which studied rectenna design, leading to several patents on thin-film versions.
- He was also generally credited with the concept that led to the development of the widely used rectenna, a device for the simultaneous capture of a microwave beam and its conversion back into direct current power.
- A nantenna, an application of a nanophotonic resonator, is a nanoscale rectenna on the order of the optical wavelength size, which acts as an " antenna " for light, converting light into electricity.
- For example, the 1978 NASA SPS study required a 1-km diameter transmitting antenna, and a 10 km diameter receiving rectenna, for a microwave beam at atmospheric absorption and even potential beam blockage by rain or water droplets.
- In 1987, the Canadian Communications Research Center used such an improved rectenna to power a UAV with a wingspan of 5 meters ( 16 feet 5 inches ) and a weight of 4.5 kilograms ( 9.9 pounds ), as part of the Stationary High Altitude Relay Platform ( SHARP ) project.
- This forces the transmitted beam to be centered precisely on the rectenna and to have a high degree of phase uniformity; if the pilot beam is lost for any reason ( if the transmitting antenna is turned away from the rectenna, for example ) the phase control value fails and the microwave power beam is automatically defocused.
- This forces the transmitted beam to be centered precisely on the rectenna and to have a high degree of phase uniformity; if the pilot beam is lost for any reason ( if the transmitting antenna is turned away from the rectenna, for example ) the phase control value fails and the microwave power beam is automatically defocused.
- The thinned array curse has consequences for microwave power transmission and wireless energy transfer concepts such as solar power satellites; it suggests that it is not possible to make a smaller beam and hence reduce the size of a receiver ( called a " rectenna " for microwave power beaming ) by phasing together beams from many small satellites.
- In 1973 Peter Glaser was granted U . S . patent number 3, 781, 647 for his method of transmitting power over long distances ( e . g . from an SPS to Earth's surface ) using microwaves from a very large antenna ( up to one square kilometer ) on the satellite to a much larger one, now known as a rectenna, on the ground.
- This assessment assumed ( optimistically ) that the antenna was a directional antenna array pointing directly at the sun; a rectenna that collects light from the whole sky, like a typical silicon solar cell does, would need the reverse-bias current to be even lower still, by orders of magnitude . ( The diode simultaneously needs a high forward-bias current, related to impedance-matching to the antenna .)
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