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Topic: Microwave antenna

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	Parabolic antenna - Wikipedia, the free encyclopedia
		This antenna is typically a low-gain type such as a half-wave dipole or a small waveguide horn.
		The feed antenna is connected to the associated radio-frequency (RF) transmitting or receiving equipment by means of a coaxial cable transmission line or hollow waveguide.
		To adapt the horn to a coaxial antenna cable, a length of waveguide is used to effect the transition.
	en.wikipedia.org /wiki/Microwave_antenna (856 words)

	Technology Summary - WARF: P05190US - Floating Sleeve Microwave Antenna for Tumor Ablation (Site not responding. Last check: 2007-10-24)
		In microwave ablation, a coaxial microwave antenna is inserted into tissue in or near a tumor to deliver microwave energy to the region and remove the tumor.
		This invention provides a novel microwave antenna that uses a floating sleeve to suppress the tail of the SAR pattern, allowing more energy to be delivered locally and evenly to the tumor while reducing the risk of detrimental backward heating.
		The antenna consists of coaxial antenna conductors surrounded by a floating metal sleeve that is electrically isolated from the antenna by a Teflon layer.
	www.warf.ws /technologies.jsp?casecode=P05190US (315 words)

	Microwave antennas (Site not responding. Last check: 2007-10-24)
		Antenna theory is primarily a design consideration of antenna size and shape requirements that depend on the frequency used.
		The power gain of an antenna is a ratio of the radiated power to that of the reference antenna, which is usually a basic dipole.
		Antenna reciprocity is possible because antenna characteristics are essentially the same regardless of whether an antenna is transmitting or receiving electromagnetic energy.
	www.tpub.com /neets/book11/46.htm (1796 words)

	RAND \| Paul Baran: Distributed Communications - Mini-Cost Microwave - Antenna Siting and Erection
		The antenna must be very rigidly fixed to the tower and must be guyed to the ground.
		Yet, the antenna must be capable of being easily adjusted and precisely aligned by one man. A few pipe-clamp assemblies, as shown in Fig.
		Of interest is the maximum antenna deflection expected due to wind loading, and the methods that may be employed to keep it below a value that would cause a mispointing of the antenna (except in rare instances).
	www.rand.org /pubs/research_memoranda/RM3762/RM3762.chap7.html (1573 words)

	Expert: Antenna/Microwave Design Expert
		He is familiar with the switchable array of end-fire radiators for the Apollo spacecraft TV antenna, the frequency surveillance interlaced antenna array for Patrick AFB, and the frequency scanned slotted arrays for missile nose cones as well as developmental mortar locators.
		He performed detailed microwave and antenna design as well as supervision of all major microwave component and sub-assembly sub-contractors.
		He was also the technical design leader for the mortar locator phased-array antenna, which incorporated frequency as well as ferrite phase shifter scanning.
	www.intota.com /viewbio.asp?bioID=603803&perID=108335 (905 words)

	Microwave thermal therapy of cardiac tissue (US5861021) (Site not responding. Last check: 2007-10-24)
		Necrosing levels of microwave energy are delivered from the microwave antenna to diseased cardiac tissue spaced from the catheter.
		Tissues immediately surrounding the catheter are cooled and microwave energy emitted by the antenna is selectively absorbed by the cooling lumen structure surrounding the antenna.
		The cooling balloon of the catheter is positioned adjacent the antenna and partially surrounds the cooling lumen structure on one side of the catheter to provide additional cooling capability and additional microwave energy absorption on the side of the catheter opposite the diseased cardiac tissue to prevent unwanted heating of blood within the cardiac chamber.
	www.delphion.com /details?pn=US05861021__&language=en (939 words)

	Rantec Microwave Systems, Inc. :: Mobile Satellite Antenna System Transmit/Receive :: Military and Commercial Microwave ...
		Rantec's MSAS is designed to receive linearly polarized microwave signals from an FSS satellite operating in the 11.7 to 12.2 GHz frequency band or circularly polarized signals from a DBS satellite in the 12.2 to 12.75 GHz frequency band.
		Microwave signal transmission is achieved by up-conversion of the IF band to 14.0 to 14.5 GHz using a phase-locked-loop TXB and a high power amplifier.
		High reliability of the antenna assembly is achieved with the use of environmentally-protected stepper motors driving the three axes of rotation.
	www.rantecmdm.com /msas_trans_rec.htm (427 words)

	Microwave Active Antenna Group
		For 11 years, the group has been working on large scale microwave and millimeter-wave spatial power combiners, both oscillators and amplifiers.
		Amplifiers: Amplifier combiners using active antenna arrays with standard half-wavelength spacing have been demonstrated at X (8, 10GHz), Ka (30-33GHz) and V (60GHz) bands.
		Patch or slot antennas are used as the radiating elements.
	nemes.colorado.edu /microwave/researchareas/active_antenna_arrays.html (510 words)

	AFC Profile for Antennas, Radomes, Microwave, Waveguide, Tallguide and Shelters
		Patterning its terrestrial microwave point-to-point conical horn antenna product line after the highly successful Telstar horn developed by Bell Laboratories, AFC pioneered a complete line of highly precise, dimensionally stable composite fiberglass antennas in various sizes for frequency coverage through 40 Ghz.
		Antenna options include cored ultra light reflectors, offset, embedded wire anti-ice or transportable systems and feeds for GOES, Intelsat, Receive/Transmit, Receive Only, Multi-satellite, International or FCC specified applications.
		Satellite antenna sizes and models are found in the table.
	www.afcsat.com /profile.html (2182 words)

	NIST Calibration Services: Electromagnetic Field Strength and Antenna Measurements
		Antennas submitted for evaluation should be mechanically and electrically stable in order to retain a calibration for a significant length of time.
		Antennas with either coaxial or waveguide connectors can be measured; however, if coaxial connectors are employed, they should be precision connectors to minimize uncertainties due to a lack of connector repeatability.
		The received signal transmitted between each pair of antennas is measured as a function of the separation distance between the antennas.
	ts.nist.gov /ts/htdocs/230/233/calibrations/Electromagnetic/Electromagnetic-field-strength.htm (1485 words)

	Antenna & Propagation engineering - In microwave antenna far-field patt
		I have learned that the effective aperture of an antenna is affected by the size of the platform on which the antenna is mounted and how it is mounted.
		Imagine for a second that the 'platform' is a large parabolic dish and is being efficiently illuminated by your antenna.
		On the other hand, if the antenna is not illuminating the structure at all (directional antenna, aimed away), then the structure wouldn't matter a bit.
	www.eng-tips.com /viewthread.cfm?qid=71840 (732 words)

	Microwave & antenna engineering journal - IEE Proceedings Microwaves Antennas & Propagation - The IET
		Papers covering all aspects of microwave and antenna engineering and propagation are published.
		Microwave circuits including RF, microwave and millimetre-wave amplifiers, oscillators, switches, mixers and other components implemented in monolithic, hybrid, multi-chip module and other technologies.
		Antenna topics including antennas for operation at all frequencies; multiband antennas, antenna measurement techniques and systems, antenna analysis and design, aperture antenna arrays, adaptive antennas, printed and wire antennas, microstrip and integrated antennas.
	www.iee.org /Publish/Journals/Profjourn/Proc/map (221 words)

	AFC Microwave Products, Waveguide Components, Antenna Feeds and Tallguide Ultra Low Loss Waveguide
		Microwave applications often require unique manufacturing and testing processes in order to achieve desired performance.
		Antenna feeds are designed according to operating frequency, antenna characteristics and pattern, power requirements and interface.
		Radar antennas, located in the aircraft nose, are in proximity to the communications center.
	www.afcsat.com /microwav.html (893 words)

	Omni-Directional microwave antenna
		The antenna has been specifically designed to provide a vertically polarised 360° field of view in Azimuth with the widest possible acceptance angle in Elevation.
		The antenna is suitable for many applications requiring good all round coverage.
		The V band version of the antenna is fed via a 1.85mm coaxial connector and careful design and manufacture ensures good return loss (see Figure 3).
	www.flann.com /Products_Home/Antennas/Omni-Directional/omni-directional.html (306 words)

	Antenna Guide
		But understanding how an antenna works can be useful when the one on your TV or radio goes south on you and the reason is beyond your comprehension.
		In addition to this field, the antenna exhibits a magnetic field that is the sum of the magnetic fields of all the free moving electrons.
		The antenna also has a dynamic electric field that is the vector sum of the dynamic electric fields of all the free electrons.
	antenna-guides.com (1618 words)

	Microwave Antenna Question...
		I was wondering if the FCC had any verbage in the contracts that the carriers sign when they put up an antenna that allows the government to use it for any purpose.
		Microwave antennas are heavily used here because of their lower long term costs for the carriers.
		The microwave links take the phone company out of the loop so network problems can be solved completely by the carrier versus having to be dependant on the telco to solve a problem.
	forums.wirelessadvisor.com /tower-hunting-club/55852-microwave-antenna-question.html#post387057 (546 words)

	ATI's Microwave Antenna Systems & Design course
		The performance of traditional antennas, including short dipoles, magnetic loops, and parabolic dishes, is summarized.
		The discussion continues with an investigation of new antenna systems, including the recent deployment on satellites of extremely large antennas that use digital beam-forming to generate hundreds of spot beams simultaneously.
		Finally, the impact of antenna system performance on spectrum management and regulatory issues is discussed, using as examples recent FCC and International Telecommunications Union rulings.
	www.aticourses.com /microwave_antenna_systems_design.htm (493 words)

	Microwave Lens Antenna
		The Microwave Lens Antenna is a (luneburg style) high efficiency antenna that can be used for transmit and receive.
		The Lens Antenna can have several feed points which allows you to transmit and receive to/from different locations with just one Lens.
		Lens Antennas integrated to interface with your feed source are available to meet your specific needs.
	www.rozendalassociates.com /antennas/MHLA.htm (65 words)

	Microwave Technology - Joakim Johansson (Site not responding. Last check: 2007-10-24)
		My task is to keep track of the subject and the research situation within radar antenna technology, to gather knowledge and to pass on this knowledge to designers and other interested parties.
		giving each antenna element its own transmitter and receiver, and the third stage is to digitise the signals that are received and then perform all signal processing on the computer.
		Rydbeck was the driving force behind Chalmers’ investment in radio and microwave technology and the founder of the Onsala Space Observatory, which has produced invaluable knowledge in antenna technology and in the radio and microwave field.
	www.chalmers.se /HyperText/Prof-E/JohanssonJoakim-E.html (1111 words)

	Amateur Ham Radio Microwave Antenna Products - Microwave antenna products for amateur ham radio use
		Completely assembled microwave parabolic antenna, white coated and with band designation, waveguide, flange and subreflector.
		All parts for the microwave parabolic antennas are made of sturdy quality materials.
		The microwave antenna is carefully sealed with a radome of outdoor quality plastic.
	www.procom-dk.com /antenna/a0802-amateur-radio-microwave-antennas (372 words)

	microwave, RF circuit design, antenna design
		With over 25 years of microwave and RF circuit design, antenna design, subsystem and system design, Tomany Consulting Corporation, has the engineering or manufacturing solution for you.
		We employ Ansoft's Serenade for high frequency circuit simulation, and design many microwave or RF components that can be incorporated into the PC board.
		We might be able to take on your entire microwave project, or any part that you need help with, including the running of EM simulations on crucial areas of your circuit.
	www.rf-microwave-design.com (315 words)

	Microwave Antenna at Somera : Microwave Antenna (Site not responding. Last check: 2007-10-24)
		Somera offers a broad range of quality, warranted products including a microwave antenna to enable point-to-point and point-to-multipoint high-speed wireless communications.
		We are committed to providing the highest quality, rapid availability, and greatest value for microwave deployment.
		A microwave antenna is included in this group.
	www.somera.com /microwave-antenna (138 words)

	UQ Microwave and Optics Group Profile
		His research areas of interest include antennas for mobile satellite and terrestrial communications, low profile antennas for reception of satellite broadcast TV programs, near-field/far-field antenna measurements, quasi-optical power combining techniques, six-port techniques, industrial applications of microwaves, and computational electromagnetics.
		He has published extensively in all these areas and is recognised as an international expert in mobile satellite communications and microwave techniques with over 160 papers, 7 reports, one book and one patent in his record.
		Investigation into the radiating/receiving elements of antenna arrays is underway to find new innovative approaches to increase the operational bandwidth, the optimal configuration, novel phasing networks and optimal tracking algorithms.
	www.elec.uq.edu.au /~mwaop/magprof.html (1153 words)

	Microwave antennas, positioners, research, consultancy and systems
		We're equipped to undertake all aspects of RF and microwave design and consultancy, including research and development through to manufacture, tests and field trials.
		Although we specialise in microwave antennas, radar front ends and antenna positioners, we have an extensive range of other microwave components - waveguide and co-axial, microwave design software as detailed in this site.
		We also have a large range of standard and non standard microwave horn antennas.
	www.q-par.com (214 words)

	USATODAY.com - Hawaii moves ahead with microwave antenna project (Site not responding. Last check: 2007-10-24)
		HAWAII KAI, Hawaii — The state and the city hope to get a microwave antenna system built on top of Koko Head by the end of the year, part of a statewide improved emergency communications system, officials said yesterday.
		At yesterday's public hearing, the state Department of Accounting and General Services, which is overseeing the project, said it has taken several years to develop the state/city and federal partnership for the Anuenue project that places broadband technology and antennas in strategic locations across the Islands.
		This year microwave antennas will be installed around the Islands, one each on Kaua'i, Maui and Moloka'i, four on the Big Island and seven on O'ahu: at Sand Island, Kalaeloa, Mauna Kapu, Mount Ka'ala, Wahiawa, Koko Head and Round Top.
	www.usatoday.com /tech/news/2005-02-08-hawaii-antenna_x.htm (476 words)

	1.5 - 18 GHz Broadband Reflector Microwave Antenna (Site not responding. Last check: 2007-10-24)
		Leominster, UK The antenna shown has a diameter of 600 mm (2 ft) and operates over the frequency band 1.5 - 18 GHz.
		This antenna is ideal for broadband surveillance or EMC measurements or even WiFi (802.11b band) and general test and measurement over much of the lower microwave band.
		Our 1.5 to 18 GHz wide band horn is used as the feed for this antenna.
	www.q-par.com /pages/1_5to18_Reflector_Ant.htm (94 words)

	microwave antenna measurement
		For Antenna gain meashurement the power of Maxim's VCO is not enough, you have to use additional PA and gain power to about +20/26dBm output.
		For VSWR measurement you can use a 50 ohm microstrip line at FR4, about half of wave, inserted btw antenna and TX closely to antenna and measure standing wave coefficient by the simpliest detector with small loop style probe, when move this one along the microstrip line.
		It is suggested that you connect the antenna with the device (e.g.
	www.edaboard.com /ftopic77246.html (1019 words)

	Microwave & electromagnetic engineering - antenna design interview questions
		I'm an RF/Microwave engineer, a recent grad., with very little antenna design exp. The only antenna design experience i have(if you can call it that) is feed network of phased arrays made up of phase shifters for X-band radar apps at my current position.
		Research these three, plus NEC software program (it's a wire code and I think it's free) on the internet and ask the employer which one of these you have, mention that you have some familiarity with them and am looking forward to learning those in detail.
		When I interview people for an antenna design position, I would ask them about the antenna specifications and how it apply to applications for which the design is for.
	www.eng-tips.com /viewthread.cfm?qid=115683&page=1 (1141 words)

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