Can anyone explain how an antenna takes an AC signal and converts it to a Transverse Electromagnetic Wave?
473172
You've actually got several concepts and questions merged together.\n\nWhen you ask "how does the aerial setup the waves from only the ac signal?"  I assume you're asking how any DC components of the signal get filtered out?\n\nA transverse electromagnetic wave involves both a VARYING electric field and a VARYING magnetic field, appearing at right angles to each other and to the direction of travel of the wave.\n\nAny DC component has no varying component, therefore, no wave is generated.  Although DC flowing through a wire creates electric and magnetic fields, no wave is generated because there is no variance in the fields.  \n\nThere are other electronics concepts that require the changing electromagnetic fields of AC to work.  A transformer uses AC, not DC.  A capacitor will block DC signals, but allow AC signals to pass.\n\nAlso, as you indicated, an efficient antenna has a matched impedance to the signal source in order to maximize the amount of engergy propagated by the antenna in the desired direction(s).
405837
You need to have recorded the power over a range of frequencies and ploted the Output over the Input. If the chirp signal can be extrapolated into its freqency components possibly you can compare the output to this, otherwise a new set of data points are required.
469104
The algebraic sum of the currents entering a node is equal to zero. Where current entering is positive and exiting is negative (or vice versa). In other words, what comes in must come out.\nNote: this is only true for DC signals.
763502
Don't do it!  EMI - electromagnetic interferrance.  The data signals in the cat5 cables will be corrupted.
903422
You can convert energy to microwaves, that can travel across space, to a receiver, that converts it back to electrical current.
335077
Radio is the wireless transmission of signals, by modulation of electromagnetic waves with frequencies below those of light.\n\nRadio propagation is a term used to explain how radio waves behave when they are transmitted, or are propagated from one point on the Earth to another.\n\nIn free space, all electromagnetic waves (radio, X-rays, visual, etc) obey the inverse-square law which states that an electromagnetic wave's strength is proportional to 1/(x2), where x is the distance from the source. Doubling the distance from a transmitter means the strength is reduced to a quarter, and so on.\n\nRadio propagation on Earth is not only affected by the inverse-square model, but by a number of other factors determined by its path from point to point. This path can be a direct line of sight path or an over-the-horizon (see also radio horizon) path aided by reflection from the ionosphere. A variety of phenomena make radio propagation more complex.\n\nSince radio propagation is somewhat unpredictable, such services as emergency locator transmitters, in-flight communication with ocean-crossing aircraft, and some television broadcasting have been moved to satellite transmitters. A satellite link, though expensive, can offer highly predictable and stable coverage of a given area.\n\nA sudden ionospheric disturbance is often the result of large solar flares directed at earth. These solar flares can disrupt HF radio propagation\n\nThe Antenna\nThe beginning and end of a communication circuit is the antenna. The antenna will provide gain and directivity on both transmit and receive. The take off angle of the antenna is based on the type of antenna, the height of the antenna above ground, and the type of ground below and in front of the antenna. The take off angle will determine the angle of attack on the ionosphere, which will effect if and where the signal will be reflected by the ionosphere.\n\nGround wave Propagation\nGround waves are radio waves that follow the curvature of the earth. Ground waves progress along the surface of the earth and must be vertically polarized to prevent short circuiting the electric field through the conductivity of the ground. Since the ground is not a perfect electrical conductor, ground waves are attenuated as they follow the earth’s surface. At low frequencies, ground losses are low and become lower at lower frequencies. The VLF and LF frequencies are mostly used for military communications, especially with ships and submarines.\n\nEarly commercial and professional radio services relied exclusively on long wave, low frequencies and ground-wave propagation. To prevent interference with these services, amateur and experimental transmitters were restricted to the higher (HF) frequencies, felt to be useless since their ground-wave range was limited. Upon discovery of the other propagation modes possible at medium wave and short wave frequencies, the advantages of HF for commercial and military purposes became apparent. Amateur experimentation was then confined only to authorized frequencies in the range.\n\nLine-of-Sight Propagation\nGround plane reflection effects are an important factor in VHF line of sight propagation. The interference between the direct beam line-of-sight and the ground reflected beam often leads to an effective inverse-fourth-power law for ground-plane limited radiation.\n\nSkywave Propagation\nSkywave propagation is any of the modes that rely on reflection of radio waves from the ionosphere, which is made up of one or more ionized layers in the upper atmosphere. These layers are directly affected by the sun, and its varying activity (sunspot cycle) determines the utility of these modes. Forecasting of skywave modes is of considerable interest to amateur radio operators and commercial marine and aircraft communications, and also to shortwave broadcasters.\n\nTropospheric Scattering\nAt VHF and higher frequencies, the atmosphere at a height of around 6 miles (10 kilometres) can scatte
41398
Concentrate on the antenna -- not the transmitter.\n\nCheck out the homebrew antenna shootout http://www.turnpoint.net/wireless/has.html  This guy made an antenna out of a pringles can that read 87db at 1120'
854524
Radio frequency, or RF, refers to that portion of the electromagnetic spectrum in which electromagnetic waves can be generated by alternating current fed to an antenna
471190
Electromagnetic radiation in the 1 to 1000 m wavelength range.
17953
In AC circuits,  actually current                   in inductors and capacitors,waveform is not in phase with voltage(You will study it later).The factor "i" ,multiplied to any vector rotates it through 90 degree in anti clockwise direction.Thus we get a mathematical technique to solve the circuit
298935
TRANSMITTER ,RECEIVER, ANTENNA COAX SWITCH, COAXIAL CABLE FOR ANTENNA, ANTENNA,  ANTENNA STRUCTURE. 2 EACH. MAKE A SYSTEM.\n\nOR\n\nTRANSCEIVER , COAX , ANTENNA, ANTENNA SUPPORT! 2 EACH. MAKE A SYSTEM.\n\n\nTRANSCEIVER COULD BE FM, OR AM.  AIRCRAFT USE AM FOR PLANE TO PLANE AND PLANE TO GROUND.  POLICE , FIRE, UTILITIES AND MOST LAND MOBILE USE NARROW BAND FM.  CB IS AM MODULATION.  THE  NEW CB IN HIGHBAND IS 900 MHZ FM THIS IS WHAT YOU CAN GET AT WALMART IN THE LITTLE WALKI-TALKIES! WITH A 6 MILE RANGE!\n\nA SYSTEM IS SYMPLY A SENDING STATION AND A RECEIVING STATION.  IT CAN BE VERY COMPLEX OR AS SIMPLE AS A SET OF WALKIE TALKIES.  A SYSTEM IS A FUNCTIONAL DEFINITON FOR SOMETHING THAT WORKS!\n\nA SYSTEM COULD REFER TO A SYSTEM THAT YOU USE AROUND YOUR HOME TO KEEP IN COMMUNICATION WITH YOUR FAMILY!  OR IT COULD BE A SYSTEM THAT A BUSINESS USES TO STAY IN TOUCH WITH ITS EMPLOYEES!  A SYSTEM IS JUST A FUNCTIONAL DEFINITION OF A OPERATIONAL "SYSTEM". IT IS THAT SIMPLE!\n\nHOPE THAT CLEARS THAT UP FOR YOUR!\n\n\nDO ME A FAVOR AND VOTE TO BREAK THE TIE ON YOUR QUESTION ON RADAR AS A DISTANCE FINDER IF YOU HAVENT CHOSEN A ANSWER YET SO THAT ONE OF US WILL GET OUR POINTS !\n\n\nTHANK YOU!!!
400251
the signal applied to the antenna is in relation to groud. the signal spewed out by radio stations travels thru the air. and a very small signal is placed on the antenna in relation to the ground. the receiver circuit takes over from there. if you drive by a radio station you will see their big antenna very isolated from ground. to prevent arching. the signal coming from them is very powerful. \n\n                                  Greg..
1161015
An antenna with thick elements has a lower Q, and hence wider bandwidth, than one with thin elements.\n\nThere are also other techniques which can increase bandwdth.  I suggest you search on Google.
762445
More complex radar systems, like those used at airports, allow radio waves to be imaged on a computer screen. They send out a beam of radio waves (like a flashlight sends out light), collect the waves that reflect of off distant objects, and reconstruct the wave pattern into an image (like the eye does with light). The result is displayed for the operator to see.
148430
A ultra-high frequency radio signal is generated by a magnitron transmitter tube.  A burst of signal is transmitted to a parabolic antenna which focuses the signal in one direction, through a hollow tube called a waveguide.  Just like a light is focused in a flashlight!\nFollowing the transmission the radar set goes into receive mode and receives the reflection of the transmitted signal.  The time delay represents the distance away from the transmitting / receiving antenna. The further away the longer it takes the signal to travel.  Now something will only be visable to radar if it is larger than a quarter wavelenth.  What this means to you in practical terms is this something can be so small that it cannot return a signal on some frequency!  So Radars that search for enemy aircraft have multiple frequencies so that they can detect multi-sized targets.  Aircraft when they come at you present a small target, although they are large.  Anyway Hope I have been of some use.\n\nHave a good day.\nIf you need more detail ask in additional details I can answer any specific.\n\nAPS
147664
It's not clear from your question, are you trying to design an antenna?  What is the purpose of this experiment?\n\nIf you want to build an antenna, I would suggest a magnetic dipole.  This is the old fashion UHF type attenna (the loop).
174710
It's a FresnelC function.  Check out the link.