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Topic: Antenna theory

Related Topics

Omnidirectional antenna

Glossary of antenna terms

Whip antenna

Yagi antenna

Dipole antenna

Cassegrain antenna

Gain

Radar

Radiation pattern

Circular polarization

Amateur radio

Polarization

Cutoff frequency

Frequency

Interferometry

	Antenna Theory
		The geometry of the antenna and the proximity of near-by objects are the main controlling factors.
		The aperture of a dipole antenna is roughly the shape of a rugby ball (elliptical) when viewed from a point 90 degrees from the line of the conductor.
		Actual construction of these antennas is such that the antenna conductor is continued on down to the ground, where a matching network transforms the high impedance of the 1/8 wavelength long, single conductor, feed line to the low impedance of the line running to the transmitter.
	k9erg.tripod.com /theory.htm (1866 words)

	Radio-Frequency Fields Group: Antenna Theory and Applications
		The Antenna Theory and Applications project develops, refines, and extends measurement techniques to meet current requirements and to anticipate future needs for accurate antenna characterization.
		For antennas with gains greater than about 15 decibels, the uncertainties of the two methods were comparable.
		Mike Francis chairs the Antenna Standards Committee of the IEEE Antennas and Propagation Society.
	www.boulder.nist.gov /div818/81802/AntennaMeasTheoryApp/index.html (733 words)

	How To Become An Antenna Guru
		The equivalent circuit is a simple series RLC circuit as shown in figure 1a where the inductance represents the inductance of the conductors, the capacitor is the capacitance between the conductors and the resistance represents the energy lost to radiation.
		If the antenna is electrically large, the pattern will have more structure, that is more peaks and nulls and the more directive will be the main lobe as shown in figure 4 for a dipole antenna that is 10.25 wavelengths long.
		The beamwidth of an antenna is a measure of the directivity of an antenna and is usually defined by the angles where the pattern drops to one half of its peak value or known as the 3db points.
	www.borg.com /~warrend/guru.html (4657 words)

	Antenna Theory
		This is the third edition of Antenna Theory: Analysis and Design which is designed to meet the needs of electrical engineering and physics students at thesenior undergraduate and beginning graduate levels, and those of practicing engineers as well.
		The book’s main objective is to introduce, in a unified manner, the fundamental principles of antenna theory and to apply them to the analysis, design, and measurements of antennas.
		A chapter on antenna measurements introduces state-of-the-art methods used in the measurements of the most basic antenna characteristics (pattern, gain, directivity, radiation efficiency, impedance, current and polarization) and updates progress made in antenna instrumentation, antenna range design, and scale modeling.
	www.eas.asu.edu /~balanis/Antenna.html (1510 words)

	(More Information on the EH Antenna)
		In the EH antenna we have an unbalanced to balanced matching network and in this, I refer to the Longitudinal or Common Mode potential as a voltage between the electrical centre of the two dipole cylinder connections and the reference zero point of the coax shield.
		The EH antenna was erected 2.5 metres from the ground.
		For the EH antenna with tubular elements of length around Pi times the tube diameter, the capacitance is around 10 pF or less and the parallel radiation resistance would appear to be close to 2368 ohms (as given by Ted Hart).
	www.qsl.net /vk5br/EHAntennaTheory.htm (4388 words)

	Basic Antenna Theory and Transmission
		Antenna theory is a large subject, so this is just a brief introduction, highlighting some important antenna topics which are relevant to circuits on this site.
		The centre vertical line represents the length of the antenna, L in meters, R is the radius of the near field.
		It should be noted that this equation assumes 100% energy is transferred from the transmitter to the antenna, and that the antenna has unity gain (a dipole).
	www.mitedu.freeserve.co.uk /Theory/antenna.htm (816 words)

	Basic antenna theory
		This type of antenna corresponds to a short (compared to the wavelength) oscillating electric dipole, and is generally known as a Hertzian oscillating dipole.
		Practical antennas have dimensions which are comparable with the wavelength of the emitted radiation.
		According to standard transmission line theory, if a transmission line is terminated by a resistor whose resistance matches the characteristic impedance of the line, then all of the power transmitted down the line is dissipated in the resistor.
	farside.ph.utexas.edu /teaching/jk1/lectures/node82.html (692 words)

	EH-Antenna
		This is primarily due to finally gaining an understanding of the theory of the EH Antenna, and using that theory to enhance the performance of the antenna.
		In the theory section there are also documents defining the “Theory of the EH Antenna” as well as a document containing the theory of a new form of radiation (Vladimir’s Theory of Waves).
		It is important to note that the EH Antenna concept can not be defined using conventional antenna theory, but rather requires new theory at the physics level.
	eh-antenna.com (824 words)

	KN4LF/KK4TR 160 Meter Linear Loaded Tee Vertical/Doublet Antenna
		This antenna design is not meant to be a rival to a 4 square vertical array but can compete with a full 1/4 wave vertical with 60 1/4 wave ground mounted or buried radial wires, if designed correctly.
		As the transmitting antenna continues to become even longer in comparison to the operating frequency, multiple lobes of radiation form on the wire in response to the numerous highest current points that exist.
		The antenna was a 1/4 wave inverted L with a 64 foot vertical section and (1/8 wave) 64 foot long radials laying on the ground surface.
	www.kn4lf.com /kn4lf2.htm (3337 words)

	Satcoms UK - Satellite Communications - Short Antenna Theory
		A standard antenna works by concentrating signals, that are picked up along its axis, to a single point.
		The receiving amplifier is usually placed near the focal point and the concentrated signals are collected into the receiver using a small horn.
		Antenna shapes and sizes vary but they all do the same thing, every antenna dish you see including radio telescopes, which are basically receive only antennas, all perform this function.
	www.satcoms.org.uk /antennas.asp (249 words)

	Antenna Pattern Measurement: Theory and Equations
		The reference antenna is mounted at the center of the positioner as the antenna under test (AUT) and adjusted to be at bore-sight level with the receive antenna.
		The receive antenna is connected to a receiver or the input of a network analyzer through one or more additional cables, possibly through a preamplifier.
		If the antenna is perfectly matched to the source cable, then all power applied to the antenna is radiated (or absorbed by losses in the antenna).
	www.ce-mag.com /archive/02/Spring/fogelle2.html (2931 words)

	Antenna Theory
		This means that a high current is required to produce the same radiated power in comparison with an antenna with a higher value of radiation resistance.
		As pointed out earlier, a small-sized antenna has the capability of being a good performer, but considerable care must be taken to insure losses do 'not offset any advantages.
		Also, since the ratio of energy stored to energy lost in the form of radiation (per rf cycle) is- greater in a smaller antenna compared to a larger one (at the same frequency), the bandwidth becomes smaller.
	www.tfcbooks.com /special/antenna.htm (1478 words)

	ARRLWeb: How Antennas Work
		The RF signal somehow leaves their antenna and is picked up by an antenna on the other end of a QSO, but to many hams this is a mysterious process.
		Antenna theory sounds like a boring, dry subject, but understanding how an antenna radiates, how it interacts with ground and understanding something about antenna polarization is central to being able to answer the question that most hams really have when they think about antennas -- "Which antenna is best?"
		The article, "Why an Antenna Radiates" answers the question about just why an antenna radiates when an RF signal is applied to its feed point.
	www.arrl.org /tis/info/antheory.html (927 words)

	Antenna : Antennas: Theory
		Antenna Noise and Signal Cancelling at LF - By using the signals from two antennas, controlling their relative amplitudes and controlling the phase of one of them, unwanted signal or unwanted noise can be phased out.
		Antennas and Propagation - The most important element in a radio circuit is the antenna.
		Multiband antennas - Information on multi-band antennas for the HF bands, from the horizontal end fed wire, to g5rv, log periodics, trap dipoles, vee beams and rhombic antennas.
	www.dxzone.com /catalog/Antennas/Theory (2811 words)

	Loop Page
		A loop antenna is an antenna primarily for the AM broadcast and the Longwave bands.
		Antenna needs have changed, with today’s broadband front ends, and synthesizer phase noise a concern, a high performance loop, or other means of pre-selection is more important than ever.
		The electrical balance of the antenna insures that the current at the termination of one end of the loop tank coil is of equal magnitude and opposite polarity to that at the other termination of the loop coil.
	www.frontiernet.net /~jadale/Loop.htm (6432 words)

	India antenna theory, India antenna theory, India antenna theory, India antenna theory, India wm1080a, mifare Qatar, ...
		India antenna theory, India antenna theory, India antenna theory, India antenna theory, India wm1080a, mifare Qatar, proximity Indonesia, India elims, India datenverbindung, India jam gsm gprs pocket, India 2 4 ghz antenna design
		India antenna theory, India antenna theory, India antenna theory
		India antenna theory, India antenna theory, India antenna theory, India wm1080a, mifare Qatar, proximity Indonesia, India elims, India datenverbindung, India jam gsm gprs pocket, India 2 4 ghz antenna design, India antenna theory, India wm1080a, mifare Qatar, proximity Indonesia, India elims, India datenverbindung, India jam gsm gprs pocket, India 2 4 ghz antenna design
	www.chipsilicon.com /India-antenna-theory (392 words)

	Antenna Theory Simplified Seminar Outline
		However, the way that antenna theory is taught in schools and universities - it is too theoretical and abstract to be very helpful.
		Transmitting and receiving antennas are analyzed using circuit theory to furnish the practicing engineer or technician with an intuitive understanding of antenna operation.
		Transmission line theory combined with the theory of partial inductance are used to develop simple and accurate circuit theory models of dipole and loop antennas.
	www.hottconsultants.com /outlines/antennas.html (316 words)

	Homebrew antenna shootout
		The Pringles Antenna design, and some designs that pre-date it, seem to treat it as though it were metallic.
		Waveguide antennas don't use the director assembly (the washery bits), and therefore are much simpler to build.
		For the antennas I was building, I was using different measurements based on the antenna design material I had been reading.
	www.turnpoint.net /wireless/has.html (872 words)

	Some topics in antenna theory.
		For a properly designed antenna, the radiated power is proportional to [the (element of current) times the (little element of length), integrated over the entire structure, allowing for the relative phases, and then the total integral is squared].
		It is clear that, although the antenna is usually considered as stationary, the radiation mechanism involves getting energy from the rest frame of the antenna to a frame moving outwards at velocity c, which is about as relativistic as one can get.
		Many problems arise in array antenna analysis, from the interpretation of the coupling between adjacent structures as being largely due to electrostatic interactions, whereas the classical antenna radiation calculations for the far-field involve the Lorentz gauge version of the electromagnetic equations, which has the relativistic effects automatically built in.
	www.ee.surrey.ac.uk /Personal/D.Jefferies/topics.html (891 words)

	Antenna Theory: Analysis and Design, 3rd Edition
		New material includes smart antennas and fractal antennas, along with the latest applications in wireless communications.
		Like the previous editions, Antenna Theory, Third Edition meets the needs of electrical engineering and physics students at the senior undergraduate and beginning graduate levels, and those of practicing engineers as well.
		It is a benchmark text for mastering the latest theory in the subject and for better understanding the technological applications.
	www.scitechpub.com /balanis_antennatheory3rd.htm (266 words)

	Antennas Training:Antennas Theory, Characteristics, Deployment, and the Future Training Onsite
		From base stations to mobiles, antennas are a pervasive and important element of wireless networks.
		This 3-5-day antennas course will be customized to your needs and specifications.
		The answers will help you exploit antennas more effectively, whether you’re designing a new network, optimizing an existing one, or migrating it to a new technology.
	www.eno.com /government/antenna_theory_design_training.html (344 words)

	Pringles Yagi Antenna
		An antenna is an amplifier in a sense.
		A useful fact here is that one antenna can and does serve for more than one frequency, but generally the ones in the middle will work better than the ones on the ends.
		To build one, take two of the directional portions of the 18" antenna, which are the parts made from the washers, metal rod and pvc with cap, and fine a 90 degree, 125 degree, or T pvc/abs connector that attaches the ends of the tubes of the directional elements.
	www.netscum.com /~clapp/wireless.html (4344 words)

	Antennas - Digital Antenna - Marine & Land Antennas, Cell Boosters Cellular
		Antenna theory sounds like a boring, dry subject, but understanding how an antenna Theory (light) and practical information on all kinds of antennas.
		Flag and Pennant antennas are great for those living on less than full Still today it is one of the best, and most popular, wire antennas around.
		Antennas are most often used to increase the range of WLAN (wireless LAN) systems, but proper antenna selection can also enhance the security of your WLAN.
	xn--5m4as4o.com /ieua/antennas.html (910 words)

	Monopole Antenna Theory :: Antenne
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		En cours 0553 de veille buddy pringles antenna icons autre fonds décrans antenna plans célébrités féminines.
	giocogratis.info /antenne/monopole-antenna-theory.html (842 words)

	Amazon.ca: Antenna Theory: Analysis and Design, 3rd Edition: Books: Constantine A. Balanis (Site not responding. Last check: 2007-11-05)
		Like the previous editions, Antenna Theory, Third Edition is designed to meet the needs of electrical engineering and physics students at the senior undergraduate and beginning graduate levels, and those of practicing engineers as well.
		A chapter on smart antennas, which is presently a hot topic of current interest to antenna engineers in a number of application areas, especially wireless communication
		I find it very useful whenever I need information about antennas for a work I'm doing and I think it is also useful for students studying the antenna theory as it has this special "academic flavour".
	www.amazon.ca /Antenna-Theory-Analysis-Design-3rd/dp/047166782X (1532 words)

	Amazon.com: Antenna Theory: Analysis and Design, 3rd Edition: Books: Constantine A. Balanis (Site not responding. Last check: 2007-11-05)
		Like the previous editions, Antenna Theory, Third Edition is designed to meet the needs of electrical engineering and physics students at the senior undergraduate and beginning graduate levels, and those of practicing engineers as well.
		A fractal antenna section, which introduces a new class of antennas that has received a lot of interest and attention after the second edition was published
		An antenna is defined by Webster's Dictionary as "a usually metallic device (as a rod or wire) for radiating or receiving radio waves." Read the first page
	www.amazon.com /Antenna-Theory-Analysis-Design-3rd/dp/047166782X (1545 words)

	Magnetic loop antenna new theory
		As can be seen in the drawing above I have marked out this example in electrical degrees this is because it makes it easier to relate to the original 1/2 wave dipole.
		Theoretically the current never drops to zero and the voltage never rises to maximum but this is not unusual in antenna descriptions take for instance the 1/2 wave dipole drawing were the voltage drops to zero at maximum current if there where no voltage present then there would not be any current.
		Measuring the current around the loop to prove the above theory was achieved by cutting the loop at the three point indicated in the above drawings and inserting three thermocouple RF amp meters.
	members.aol.com /benprom/index.htm/theory.html (554 words)

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