Search Engine www.edaboard.com

Calculate Antenna Efficiency

Add Question

40 Threads found on edaboard.com: Calculate Antenna Efficiency
Hi wesleyclone, Usually we go for efficiency ,once we know the s parametrs and there by the resonace of the antenna ,you know the frequency at which the efficiency is needed and regarding phi and theta ,you can opt for them or not .I guess its better to calculate the efficiency by defining the whole sphere.
You can only use S11 measurement. I think Balanis book has a nice and simple but still accurate way to calculate antenna efficiency through measurement. Assuming that your antenna is small enough (say biggest dimension not more than 10 cm or so) idea goes like this: In open space Q factor includes radiation, (...)
I'm not sure if my reply is applicable, or it may form another discussion, or I may infact be talking rubbish. But being a much practical person who uses simulation tools occasionally, I THINK I was told that some people would calculate efficiency using the: efficiency = (Gain of measured AUT / Gain of simulated AUT)*100% Do let me (...)
Hi All, How can I calculate the efficiency and gain of an patch antenna modeled in HFSS? Regards, -- Soyuz
hello everyone, anyone know how to calculate the efficiency in percent using cst? hope u all can help me. regards, kyg
Are you trying to calculate antenna apature efficiency?
currently i am involved in an antenna design using XFDTD. can easily get the patter and the return loss plots. the question is whether it is possible to obtain the TRP total radiated power in order to calculate the efficiency of the antenna. if XFDTD cannot, HFSS can or not? anybody is experienced in such topics can (...)
How we calculate the gain of antenna? high gain antenna is highy directional antenna? the gain of Yaggi antenna is zero?
Hello everyone I am trying to plot the radiation efficiency of a patch antenna vs thickness of the substrate. I want to see the effect of dielectric loss, conductor loss and surface waves on the radiation efficiency. Does anyone know how to calculate surface waves for patch antenna with different (...)
hi plz tell me how can i calculate the copolarazation and crosspolarization level of antenna,efficiency,3dB beamwidth etc. parameter of antenna in HFSS.
You probably encountered that Prx = Aeff*PFD Prx = received power (W), Aeff = effective aperture (m2), PFD = power flux density (W/m2). Theoretically, antennas can have Aeff > Aphysical. From a more practical standpoint of view, only electrically small antennas (size < 0.25 lambda) can have significant larger Aeff. This is due to resonance. A
How can I do it? As sketched in previous post. Sweep a signal generator over the intended frequency range, measure input and radiated power, calculate the ratio for each frequency, plot the result. I have another question... Several misunderstandings of S-parameters seems to be involved. - S parameters can be app
Hello e.m. fans, First of all,Football, are your data measured or calculated? Probably calculated. What frequency are you using? How much is the Gain of the unperturbated patch? Anyway, considering your problem I can say that inserting a pin, a slot, a lumped element..., you can have or a broadbanding or a size reduction effect..
Hi all, I am simulating a p@tch antenna. The S11 plot looks okay and radiation patterns too are okay but when I use the "Compute antenna parameters" feature ( by right clicking the infinite sphere used to calculate the far fields ) , it gives a radiation efficiency of 1.013 . How can this happen ? I am using (...)
i think he askes how to calculate its lengh ???? its easy (300 / freq) = size of full wave (*.96) {velocity factor} then (/ 4) for a quarter wave size size in meters of each element = (((300/freq)*.96)/4) a dipole has an impedance of 75R so look in a 50R system for ~ 1:1.5 standing wave ratio
its too difficult Is it too difficult to explain or too difficult to calculate. Regards
Can anybody explain how i can compute gain from radiation pattern? I could not obtain a satisfactory solution for this problem. Thanks in advance Measure Half power beam width in the E-plane and H-plane. Multiply them and invert and again multiply with 4*pi. The result will be approximate far field directivity. Now
Hi All, How can I calculate/plot the Gain and efficiency of my antenna? (1) At single/solution frequency (2) Over the frequency sweep Apologize about the reposting but I am clueless on this? Thanks, Soyuz
If i know the total efficiency of a linear polarised antenna. Is it possible to calculate how much of the efficiency comes from RHCP and LHCP using the axial ratio or maybe another method Petrus
There are a number of ways to estimate the gain of an antenna. Here is one: G dbi = 10 log10 ( 4 Π (effective aperture area) / λ?) * efficiency The distance on the surface of the earth may be calculated using spherical trig. Look up the details is Bowditch ( a bible in the boating world). Added after 7 m
Hi.. I´ve a presentation of a patch antenna in September in my university and i was thinking to protect the antenna with Acrylic sheet´s, but i cant find any information about the Dielectric constant of Acrylic.. -Anyone knows the Dielectric constant of Acrylic? -how can i measure/calculate the Dielectric constant of Acrylic? (...)
Hi, Suppose I simulate a patch antenna. What do you suggest, in order to convert it to a two-port model? Here's a method: Using the input impedance of the antenna, and supposing the radiation efficiency equals to 1, we got: Zin (known from simulation)= Rr+jXantenna + Rl(equals to zero because of radiation (...)
hi when we simulate any printed antenna in simulation software(CST, HFSS) how important it is to assign correct loss property to substrate to calculate accurate gain and efficiency and how gain is related with the loss tangent or conductivity of material on which antenna is printed any comments are welcome regards
Hi, I am searching for a formula to calculate the number of turns of a helical antenna for a handheld instrument. The Helix has to be of very small diameter (max. 4.5mm). The wire diameter should be 1.0mm but could be less (0.8mm). The length must not be longer than 90mm. The antenna should be resonant at 434MHz (most likely with 50 Ohm (...)
I m working on broadband microstrip patch antenna n wants to calculate the axial ratio bandwidth. i hav simulated my antenna design using HFSS11 n found the results. but in results to find axial ratio its giving plot w.r. to theta.if i select a frequency it shows only solution frequecy. in order to calculate AR BW i need (...)
Sorry, I have no easy equations ready. I would measure or simulate the antenna input impedance and then use an RF circuit simulator to calculate the matching component values. Here's an introduction to electrically small antennas: In that document, a short dipole is
this software calculate LPDA antenna for u and you and simulated in hfss after calculate with this software
You may mis-understand your friends' suggestions. It's right UHF RFID tags use backscatter to communicate with readers. However, the matching between tag chip and tag antenna still plays an important role in their performance. What needs to be pay attention to is that S11 generated by HFSS automatically cannot be used directly in case of UHF RFID t
I do not see any problem with Kirchhoff's volt and current laws as long as you remember that in RF are both voltage and current vector values. If you is asking how to calculate received energy for an antenna, can this be a good start: Your 555 TX example, is a bit special as TX and RX monopole antennas had a very
With loop inductance and frequency known, can you calculate expected capacitance for resonance. This value can be needed to be adjusted depending on how you are connecting to the antenna and if it should include coupling effect from RX loop and its load. Connecting 50 Ohm source can be done in many ways, which to select depends on several factors,
Hi, I would just need an equation form which I can calculate the aperture efficiency of a circular waveguide antenna. I have data from gain, wavelength and its physical size. The way that is shown in books is: Effective area (Ae)=(Gain*lambda^2)/(4pi), Physical dimensions of open end of antenna(Ap)= pi*r^2 (...)
it is using when I calculate the input impedance or width of feed line
Hi, How to calculate the size of the ground plane when using a monopole antenna? Is it w.r.t. the frequency that we use or the physical length of the antenna or any other factor? I want to use a monopole antenna in 434.7 MHz transmitter and the antenna's physical length is 16 Cm. I checked the (...)
Hello, I need to match an antenna with a very low resistance (~0.5Ohm) with discrete components using a low pass matching network at 900MHz. I know how to calculate the matching network, but I'm not sure if this can be done in practice. Does someone have an advice for such a matching?
Hello everybody . i hope you be fine I have a question about how to design Terahertz antenna in CST Microwave suppose a Bow antenna which is designed in band 100GHz to 3THz , I want to know that how i can excite in a Electromagnetic Wave in feed of this antenna that i be able to determine the power of this signal ( I mean does CST (...)
hi,are there any program that u give him the band and the gain,calculate the dimension and the directivity,and other parameters regards In the usual case that λ>> Diameter and for λ>>rms mirror accuracy, you don't need any sophisticated software. Just apply: G= η 4 pi A /λ? pi=3.1415... A=Apertur
I have the following problem that I have worked on for too long and have still not been able to come up with the answer. A DBS Reflector antenna operating at 12.4 GHz with a bandwidth of 20 MHz has a diameter of 18" and an aperature efficiency of 75%. A noise temperature of 50K is measured as the antenna is pointed toward a region of the (...)
I made a radio station,the way of modulation is FSK,I want to send the message far to 5Km,so i need a power amplifer,5 Watt is enough????? May anybody recommend me a Schimatic about a 5Watt's power amplifer??? Thanks~~~~~ 5W is too much if you use low frequency as 100MHz.. Look space attenuation curves at the frequenc
You have mentioned that the antenna aperture is 60%, I would assume that you meant the antenna aperture efficiency \eta _e to be 60%. The effective aperture A_e of the antenna is linked to the antenna gain G and its physical aperture A_p via: A_e = \frac{\lambda^2 G}{4\pi} = \eta _e A_p[/
Dear all, Have a nice day. Now I use 3D Feko for antenna and I have some question on it. 1. How can I make the Feko calculate on frequencies bands like from 1 : 3 GHz ? 2. How can I analysis the cassegrain antenna in feko ? 3. How can I obtain the following relations : Gain VS Frequencies in graph (...)