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32 Threads found on Short Dipole
you CAN have a non resonating radiating structure. Like a small loop that is driven by a current source. It will be very inefficient though, but will work very broadband simply because you are not resonating it. with a loop, you can just make it out of thick conductor and pump a LOT of RF current into it. For a electrically-short dipole, you
I miss any definition of your SYSTEM. At 434 it sounds like a short-range remote control (like car-key). You can use a bare diode detector with a half-wave dipole if you transmit enough power to it. Microcontroller is not a part of the receiver, it only processes receiver output.
Spurious emissions are calibrated with a special antenna such as dodecahedral dipole at 10m in an open field. Although you can locate spurious sources using any Spectrum Analyzer and a stub antenna ( short piece of wire ) and realize that the gain is proportional to length up to 1/10λ and use a 1/2λ length at the observed fre
For a limited antenna design volume, you have the choice: 1. A short monopole, reflected in ground. 2. Two half as long dipole elements, low ground reflection. Alt 1. will in any case result in biggest effective antenna size. If ground length is long enough can alt 1 be twice as big antenna compared to alt 2.
Hi all guys, I would like to ask you about position of two dipole antennas and the possible losses. In short, what happens when two dipoles are parallel but they are not on the axis of max gain? For example, what happens when receiving dipole is parallel to transmitting dipole but is on certain height? (...)
You can get a formula for the complex impedance of the antenna from Wikipedia under "short dipole" on the "dipole Antenna" entry. and there is a section on "General Impedance can use a calculator on it. You will be looking to
I can't understand, is it actually reflects some? I thought quarterwave stub makes short at it's F. But in few designs where harmonics involved, they call them reflector at n*F0.
One-tenth wavelength dipole, 1.9 GHz on FR4 PCB. About 10 mm long antenna? Yes it is possible to design and impedance match a such antenna. Anyone can do it. Very few can do it and get reasonable performance. Good skills how to set up a VNA is recommended as short antennas and extreme impedances both requires good calibration to be able to get us
iam new in antenna design , i need some one to help of dipole antenna design by Using 4NEC2 software, design and analyze dipole antenna of length λ/20, λ/2, 3λ/4, and λ for FM Transmission. and if theres any good - short tutorial using 4Nec2 thank you all in advance
The one on the top is probably helix. The middle antenna is what sometimes called 'sleeve dipole': coaxial cable in the middle, center conductor extends up (thin top part of the antenna) and forms one side of the dipole. The braid soldered to section of tube, forming second electrode. the thicker short section at the bottom, right before (...)
i am desgin the end fed dipole by using resonace parallel LC circuit for 869MHz but first i uses the equation Xc=Xl and f=1/2pi*sqrtLC and used short air core cylindrical coil and ceramic capacitor and RG58 and whip but i have problem with my calc it didnt resonace at the frequency and my problem is on which way i choose the inductance and the cap
The correct one is, I think, the second. The 800*(l^2/lambda^2) comes from Cheng's formula Rr ~ 80*(pi)^2*(l/lambda)^2 I think its wrong. We also get Rr = 20*(pi)^2*(l/lambda)^2 which tries to make (pi/6)*Zo ~ 20*pi^2 where pi^2 is taken to be approximately 10 The Free Space impedance (only part of the dipole formula!), also sometime
Measured negative real values, are mostly an operator error. How was the calibration performed? By checking/calibrating your probe as open load and short are negative real values avoided in an passive antenna. If it not is possible to do that kind of VNA calibration, make a coaxial balun for narrow band measurements. That kind of balun is very simp
hi, advanatge of electro-optic dipole over short dipole type in rf measurements?
You should also realise from a legal point of view, that band allocation is supposed to be low power short range so as not to interfer with licenced users of the band :) Dave
Hello, This is a long story, but I will try to keep it short. When you look to a HW dipole, you see two quarter wave transmission line sections with the source in the middle. The "loss" due to radiation causes the impedance between the two, quarter wave pieces to be non-zero. If there were no loss, the impedance would be zero (property o
For short dipole, Prad = 0.5I^2Rr where Rr=20pi^2(l/lambda)^2
Hi there, Anyone can show me how to calculate mutual impedance of 2 dipole antennas (one dipole is driven while one is short circuit) using input impedance obtained from NEC? I'm using this: Zmutual=sqrt. However, it didn't match with the calculation I used by Induced EMF Method.This method (EMF) matched with previous con
Anyone please find polarization of electric dipole antenna and magnetic dipole antenna in unit vector. (define: short dipole, //x-axis ) i give 20 point for anwser. thanks
In second case you short to ground the fringing fields from the edge of the patch element. In a Patch Antenna the surface conductor element does not form the radiating element, as in other antennas (dipole, monopole, etc). The radiation occurs from along edges (Length and Width), and which edge depends by the operating electromagnetic mode.