
	Where results make sense

Topic: Rectenna

Related Topics

Microwave power transmission

Explosively pumped flux compression generator

Transient electromagnetic device

Microwave

High Energy Radio Frequency weapons

Electromagnetic pulse

Stole

Boeing Stratocruiser

List of Broadway musicals

	Rectenna - Wikipedia, the free encyclopedia
		A rectenna is a rectifying antenna, a special type of antenna that is used to directly convert microwave energy into DC electricity.
		Rectennae are highly efficient at converting microwave energy to electricity.
		Due to their high efficiency and relative cheapness, rectennae feature in most microwave power transmission proposals such as those used by solar power satellites.
	en.wikipedia.org /wiki/Rectenna (286 words)

	Solar power satellite - Wikipedia, the free encyclopedia
		Crops and farm animals may be raised underneath the rectenna, as the thin wires used only slightly reduce sunlight, so the rectennas are not as expensive in terms of land as might be supposed.
		Outside of the rectenna the microwave levels rapidly decrease, nearby towns or cities should be completely unaffected.
		However, an SPS also requires a large ground structure; the rectenna on the ground is much larger than the area of the solar panels in space.
	en.wikipedia.org /wiki/Solar_power_satellite (3200 words)

	PERMANENT - Products and Services - SPS Technical Issues
		The efficiency of the SPS is often stated in terms of "DC to DC efficiency", i.e., from the DC input at the solar cells to the DC output of the rectenna.
		Rectenna construction "involves the placement or assembly of a large number of identical structural elements in a very simple environment", requiring "simple, monotonous, and repetitive tasks", and "low skill level requirements".
		Studies have shown that there will be no problem finding rectenna sites in the USA for the current design of rectenna, assuming the low power density of the beam (mainly for birds) and hence large rectennas, and lower frequency (longer wavelength) beam.
	www.permanent.com /p-sps-tc.htm (1074 words)

	Electricity from L-5 (10-Apr-1997) (Site not responding. Last check: 2007-11-01)
		I believe the power density at the rectenna was said to be such that cows and sheep could graze on the same land.
		Supposing the rectenna to be 10 km square, that's 10^8 m^2.
		So the sheep underneath the rectenna is as though in the sun, but the sunlight in question is microwaves.
	www-formal.stanford.edu /pub/jmc/progress/oneill1.html (652 words)

	Rectenna - Biocrawler (Site not responding. Last check: 2007-11-01)
		Schottky diodes are used because they have the lowest voltage drop and therefore waste the minimum power.
		In the Star Wars universe, a rectenna is a scanning and tracking array which features active and passive scanners, a jamming system, ship-to-ship transmitters, and a short-range target acquisition program.
		You can find it there under the keyword Rectenna (http://en.wikipedia.org/wiki/Rectenna)The list of previous authors is available here: version history (http://en.wikipedia.org/w/index.php?title=Rectennaandaction=history).
	www.biocrawler.com /encyclopedia/Rectenna (367 words)

	Bringing Mars Into The Iron Age
		And, most of a rectenna's mass is in the metal for the dipole antennas.
		Unlike solar arrays that would have to be dusted off periodically, the rectenna would require little maintenance since the dust particles are too small to interact with the radio waves.
		And the rectenna would work year-round, night and day, with the exception of short eclipses during the spring and autumnal equinoxes.
	www.eurekalert.org /pub_releases/1999-03/NSFC-BMIT-030399.php (1217 words)

	SRP-3: Saber
		At the Earth station rectennas convert the microwave energy to direct current which can be either converted to alternating current for direct distribution through a power grid, or can be used to split hydrogen from water.
		The rectenna array converts the microwave energy back into DC energy that is used by the rotary winged platform (helicopter) to provide control and support, enabling the platform to stay aloft indefinitely.
		The rectenna array will consist of 99 rectenna elements from the original JPL Goldstone experiment in which over 30 kW of power was received over a one mile distance [3].
	www.uaf.edu /asgp/asrp/srp3/saber.htm (1526 words)

	A rectenna is a rect ifying ant enna a special type... (Site not responding. Last check: 2007-11-01)
		A "rectenna" is a "rect"ifying ant"enna", a special type of antenna antenna that is used to directly convert microwave microwave energy into DC DC electricity electricity.
		A simple rectenna can be constructed from a schottky diode schottky diode placed between antenna dipole dipoles.
		Due to their high efficiency and relative cheapness, rectennae feature in most microwave power transmission microwave power transmission proposals such as those used by solar power satellite solar power satellites.
	www.biodatabase.de /Rectenna (288 words)

	LUNAR SOLAR POWER SYSTEM FOR ENERGY PROSPERITY WITHIN THE 21ST CENTURY
		Rectennas on Earth and the lunar transmitters can be sized to permit the use of Earth orbiting redirectors that are 200 m to 1,000 m in diameter.
		A rectenna of one-square-kilometer area with an average output of 180 MWe produces every year the electric energy equivalent to burning 3.3 million barrels of oil or 650,000 tons of coal in a fossil-fueled electric plant.
		Rectennas provide both developed and developing countries equal access to electric power for economic development and the enhancement and preservation of the local environment.
	www.worldenergy.org /wec-geis/publications/default/tech_papers/17th_congress/4_1_33.asp (4213 words)

	Rectenna
		Tests were made using rectennas made of common copper wire with a 1.2 mm diameter and with silver coated copper wire of the same diameter, with was expected to give better performances at microwave frequencies.
		After the preliminary rectenna selection tests were completed, the "H" - type rectennas were retained for the construction of the reception arrays, because of their better performances, but also in reason of the great simplicity of their fabrication.
		T'he four rectenna arrays were located in the center of the georama, at a distance of 1.2 m below the transmitting array, at the maximum distance compatible with the operation of the end payloads, slighly before the operating point where the performance was beginning to decrease sharply because of the proximity of the cut-off' point.
	www2.univ-reunion.fr /~lcks/Old_Version/rectenH.htm (3893 words)

	LiftPort Group Discussion Boards - Beaming down power (Site not responding. Last check: 2007-11-01)
		The disadvantage of low beam density is the rectenna needs several square kilometers of active area for a one gigawatt beam.
		It was simulations that were used to arrive at the "tapered aperture" for the transmitting antenna that minimized energy in the beam beyond the boundaries of the target rectenna.
		There isn't really a choice, the laws of optics dictate that the rectenna needs to be kilometers in size, anyway, because the beam could not possibly be focussed any tighter.
	www.liftport.com /forums/printthread.php?t=248&pp=40 (2894 words)

	Space Future - Conceptual Study of A Solar Power Satellite, SPS 2000
		It is assumed that the rectennas will be built and operated by electric utility companies which buy microwave from the satellite.
		The roof is formed by solar panels and the spacetenna is built on the bottom plane to transmit microwaves to the ground.
		Different types of rectennas are assumed to be designed to meet different regional requirements.
	www.declarepeace.org.uk /captain/murder_inc/site/haarp_patents/conceptual_study_of_a_solar_power_satellite_sps_2000.shtml (3264 words)

	Inverse Rectennas for Two-Way Wireless Power Transmission
		However, preliminary experiments have demonstrated that a rectenna of suitable design can be made to operate in an inverse mode, in which radio-frequency (RF) power is generated in the rectenna rectifier circuits and radiated by the rectenna antenna elements.
		If only one device — a rectenna capable of operating in transmitting as well as receiving mode — could be used at each end of a microwave power link, then the cost of the link could be reduced.
		This Rectenna Array consists of multiple identical units, each containing dipole microwave antenna elements, microwave circuitry, and a half-wave rectifier in the form of a GaAs Schottky-barrier diode.
	www.nasatech.com /Briefs/July98/NPO20321.html (459 words)

	SELF-BIASED RECEIVER SYSTEM
		The receiver recovers the transmitted data or voice signals while the rectenna generates DC power to be supplied to the receiver.
		The rectenna achieves high conversion efficiency up to 80% as a result of the harmonic rejection of the circular sector antenna.
		The rectified DC power from the rectenna is applied for a bias of the LNA without any external bias.
	www.research.ucla.edu /tech/ucla05-682.htm (358 words)

	[12.0] The Prehistory Of Endurance UAVs
		Raytheon suggested what would now be described as a HALE UAV helicopter operating using beamed power, flying at an altitude of 15 kilometers (9 miles), as far back as 1959, and actually performed a proof-of-concept demonstration in 1964, with a transmitting antenna powering a helicopter on a 20 meter (65 foot) tether.
		The NASA rectenna was made of a thin plastic film, with dipole antennas and receiving circuits embedded in its surface.
		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.
	www.vectorsite.net /twuav_12.html (3078 words)

	[1] Hiroshi Matsumoto, Hisashi Hirata, Yoshitaka Hashino, and Naoki Shinohara, "Theoretical Analysis of Nonlinear ...
		We examine the output powers of rectennas connected in series or parallel and compare them with the sum of their individual maximum output powers.
		We examine the sum of the outputs of two or three rectenna panels which are connected ether in parallel or in series or in the hybrid manner under the same microwave circumstances.
		With the rectenna array, We found that we could improve output DC power of the rectenna array by arranging the placement of the rectenna elements.
	www.kurasc.kyoto-u.ac.jp /space/people/shino/thesis-e.htm (2828 words)

	Demonstration of Wireless Power Transmission (Site not responding. Last check: 2007-11-01)
		A rectifying antenna called a rectenna receives the transmitted power and converts the microwave power to direct current (DC) power.
		This demonstration rectenna consists of 6 rows of dipoles antennas where 8 dipoles belong to each row.
		This rectenna has a 25% collection and conversion efficiency, but rectennas have been tested with greater than 90% efficiency at 2.45 GHz.
	www.tsgc.utexas.edu /tadp/1996/general/wpt.html (308 words)

	Space Settlement Design: Solar Power in Space (Site not responding. Last check: 2007-11-01)
		Large antennas in geosynchronous orbit, combined with the physics of an expanding microwave beam, resulted in receiving antenna (rectenna) designs six to eight miles across (10 to 13 kilometers), with maximum intensity at the center of the microwave beam less than five times greater than standards for kitchen emissions from a microwave oven.
		Because the rectenna structures would be ten to twelve feet off the ground and designed to capture all of the microwave energy in the beam, the land under the rectenna would be available for agriculture.
		Whether a space settlement is designed with its own solar panels or with a rectenna for receiving power generated elsewhere in space, the equipment for providing power will be a major part of what is seen when the settlement is viewed by approaching spacecraft.
	spaceset.org /p.solar.html (1035 words)

	History of Microwave Power Transmission before 1980y (Site not responding. Last check: 2007-11-01)
		A power conversion device from microwave to DC, called a rectenna, was invented and used for the microwave-powered helicopter.
		The first rectenna was composed of 28 half-wave dipoles terminated in a bridge rectifier using point-contact semiconductor diodes.
		The highest record of 84 % efficiency was attained in the demonstration of microwave power transmission in 1975 at the JPL Goldstone Facility.
	www.kurasc.kyoto-u.ac.jp /plasma-group/sps/history2-e.html (389 words)

	The SABER Microwave Helicopter Project, UAF
		A very large solar array at geosynchronous orbit converts solar energy to electrical energy which is transmitted as microwaves to an Earth station.
		A portion of the microwave beam is intercepted by a rectenna array.
		Each element is a complete rectenna consisting of dipole, diode, and matching section.
	www.pfrr.alaska.edu /ASGP/ALASKA/UA/ASGP/SABER.HTM (1576 words)

	CIPO - Canadian Patent Database - Claims - 1309769 (Site not responding. Last check: 2007-11-01)
		10, wherein said rectennae and said reflector screen are conformally applied to the undersurface of respective wings of said aircraft.
		An electromagnetic energy transmission, reception and conversion system as defined in claim 8, wherein said pair of rectennae are separate by a distance of m.lambda./2, where m is a whole number and.lambda.
		An electromagnetic energy transmission, reception and conversion mobile system as defined in claim 10, wherein said pair of rectennae are separate by a distance of m.lambda./2, where m is a whole number and.lambda.
	patents1.ic.gc.ca /claims?patent_number=1309769&language=EN_CA (764 words)

	N04-096 - Rectenna Systems for Power Scavenging (Site not responding. Last check: 2007-11-01)
		The utility of a system that is capable of reclaiming this stray energy for future use is unlimited.
		We propose the use of a genetically engineered antenna/rectifier (rectenna) system to capture the available stray energy and transform it into a form suitable to battery charging.
		The final product of the proposed research will be a cost effective low profile rectenna system that is specifically designed to take advantage of the RF energy sources available in the Navy fleet.
	www.navysbir.com /04_1/33.htm (135 words)

	Analysis (Site not responding. Last check: 2007-11-01)
		The higher the orbit, the wider the signal from the satellite becomes, and the larger the rectenna on earth would have to be.
		To efficiently collect the signal of a satellite in a GEO orbit, a rectenna would have to be circular in shape with a diameter of approximately five kilometers.
		In the future, with larger satellites and multiple rectennas along the equator, amounts as high as 1.2 GW per satellite at all times of the day can be obtained.
	www.ecsel.psu.edu /~dlc246/dlc246/solar/analysis.htm (1874 words)

	Kyoto University 21COE Program "Establishment of COE on Sustainable Energy System"
		However, characteristics of almost all past rectennas are for over 100mW rectifying and the RF-DC conversion efficiency is less than 20 % at 1mW microwave input.
		We have survey all circuit parameters in order to increase the efficiency at 1mW microwave input and finally we have succeeded to develop new rectenna whose efficiency at 1mW microwave input is approximately 50%.
		The new rectenna is composed of a printed dipole, a LPF and a rectifying circuit on coplanar line whose impedance is 200Ω.
	energy.coe21.kyoto-u.ac.jp /eng/task-solar/sub-sps/9sps.html (192 words)

	NASAexplores 9-12 Lesson: Microwaves Of Acceleration (Student Sheets)
		Microwaves could be beamed from either a ground-based or solar-powered satellite power source to a microwave Earth-to-orbit Lightcraft.
		The rectenna(s) need to have extreme sensitivity to receive and reflect the microwaves, but strong enough to withstand the harsh environment of space.
		m/s), and σ is the areal density (the amount of mass per surface area of the rectenna) in kilograms per square meter (kg/m
	www.nasaexplores.com /show_912_student_st.php?id=030505122151 (627 words)

Try your search on: Qwika (all wikis)