# Calculate Antenna Efficiency

121 Threads found on edaboard.com: Calculate Antenna Efficiency

## How to calculate antenna efficiency in HFSS?

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.

## antenna efficiency Help Reqd

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, (...)

## A qustion about antenna efficiency calculated in HFSS!

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 (...)

## HFSS Beginner - Patch antenna efficiency & gain calculat

Hi All, How can I calculate the efficiency and gain of an patch antenna modeled in HFSS? Regards, -- Soyuz

## How to calculate the efficiency in percent using CST?

hello everyone, anyone know how to calculate the efficiency in percent using cst? hope u all can help me. regards, kyg

## Total radiation efficiency = antenna efficiency

@vfone, thanks for the information. since total radiation efficiency is a multiplication of antenna efficiency and mismatch loss, with higher antenna efficiency, usually it can try to offset the minimal loss of S11 at -4dB ? how do we calculate based on the equation in terms of %? (...)

## Theoretical Antenna Efficiency calculation formula using Gain comparison method

As I have the practical value table of AUT gain ,Ref antenna gain, AUT maximum received power ,Ref antenna maximum received power (dB) and cable losses value, I am bit unsure about the theoretical formula to calculate the efficiency using Gain comparison would be highly appreciated if anyone could come forward to sort out my (...)

## how calculate and plot antenna efficiency versus frequency?

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

## Reduction of Antenna Size for Tiny Devices

I work on the design of self-sufficient wireless sensor nodes (edge length range of 5 .... 15mm). Now I'm looking for the minimal volume of the antenna (the small electronic layer is for this consideration negligible but keep in mind the rest of the volume is a metal block => shielding effects of the battery). Assuming constant receiver sensitivity

## how can i know about the efficiency of my antenna?

I know how to mesure the gain,the pattern but how can i calculate or mesure the efficiency of an antenna? :( can somebody tell me? thanks!

## TRP or radiation efficiency using XFDTD or HFSS

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 can we calculate the gain of an antenna?

How we calculate the gain of antenna? high gain antenna is highy directional antenna? the gain of Yaggi antenna is zero?

## How to calculate gain from radiation pattern?

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

## How to reduce the length of antenna???

Normally antennas for this frequency range are made using an inductor in series with a reduced length rod. Long ago I used to repair CB (citizen band)and other types of amateur radios. I was very much used to those antennas with size around 1.5m or less. As you can see the lambda/4 is about 2.8m at 27MHz. So, in fact the antennas I used to (...)

## HFSS - Microstrip patch antenna (surface wave calculation)

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 (...)

## antenna parameter in hfss

hi plz tell me how can i calculate the copolarazation and crosspolarization level of antenna,efficiency,3dB beamwidth etc. parameter of antenna in HFSS.

## Making a portable wideband VHF antenna

A magnetic antenna that's possibly fine for 30 MHz may be useless for 300 Mhz. The datasheet seems to focus on low intermodulation but doesn't give any noise data. So you're unable to calculate an effective sensitivity expressed in field strength numbers. But you didn't tell your application and I can't know if it matters.

## need help about microstrip line antenna

hello all i'm newbie in this forum.... I'm working on final project on microstrip antennas. I ask for help to design microstrip line antenna with a frequency of 144 MHz. I simulate this task using HFSS 11. is there anything that can help me design this antenna? and my little experience difficulties regarding electrical length, how to (...)

## 434MHZ PCB antenna design help

Hi I'm using following RF modules in my project and need urgent help on designing antennas. My entire project is halt because of the antenna problem. I cant send transmission to more than 1.5m without corruption. I'm currently using 30cm long pieces of wires hanging in open air outside the enclosure. So I'm looking for a PCB antenna. (...)

## physical and effective aperture of antenna

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

## Advice on GSM antenna for poor coverage areas

External antenna, if monopole it assumes that you can place it on your own ground plane, big enough, such as a car roof. Most simple is then to select a typical antenna for car mount. Some types promises higher gain if of type collinear antenna. No special brand recommended, they are about equal. Main difference can be that some of these (...)

## Aperture efficiency of reflectarray antenna

Hi, I saw most of the IEEE papers on reflectarray design had included the value for aperture efficiency. How can we calculate the aperture efficiency of a reflectarray antenna? How much percent of aperture efficiency is consider good? Thanks.

## coaxial cable length in antenna feeding

Hi WimRFP.how are you?thank you very much fro your reply. yes,of structure is a monopole antenna that I want to apply a signal to it. you suppose "signal 1" is on and "signal 2" is off.and suppose I want to excite it,according with figure. I don't want use from a simple lamped port at bottom of monopole or a coaxial cable that feed ant

## Need advise on designing microstrip antenna 315MHz

Hi... I need advices from everybody on how to design a microstrip antenna (on pcb) for 315mhz. For Tx, it's a loop antenna, and rx, it's a monopople PCB trace antenna. Also, one more thing, I just need to do transmission for a short distance only about 3 or 4 meters. Once, I just bluntly design the antenna as has (...)

## ULTR-BROADBAND ANTENNA - books or papers needed

you can fully perform tx rx with a very wideband antenna 0 - 30 mhz or 30 mhz - 1ghz or 1g - 10 g if you phase all three you get full coverage and a little extra gain use 1/4 wave at the center freq of each band bring all three down {obviously placing the 30 mhz version up hight enough and wi

## How to design Meander line antenna

Hi, I usually scan the ready antenna (from PCB or paper) , then import it to CorelDraw and draw over it. Then export the drawn picture to ORCAD MAX file. Works great. But if you have to calculate the dimensions and the shapes.. I have no idea. For sure, something that's already made like PCB is easy to be reproduced in COrelDraw with extre

If your application work about 100mhz, it's very difficult to make isolation because near field of antenna if they are very close. Also, you can not expect good isolation if they are in the same direction, if they are not affect may be small. Try to calculate effect each on other to see what will happen. Anyway you can make ground walls beatween

## Spiral antenna simulation in HFSS

you should go to radiation in left box/ then right click and define the infinite sphere in Insert far field ... then click right on the results and calculate the antenna propertis! after OK! hfss compute the RHCP and LHCP of your simulated antenna

## Problems with MoM efficiency

can surface waves cause that much difference? 1.0 vs 0.6? It is very likely that the project is not setup correctly. In other words, the codes did not calculate what you expect them to do.

## [HELP] CST MWS radiation efficiency

Hi Eirp, In MWS , the rad eff. is the ratio of the radiated to accepted (input) power of the antenna. For a lossless structure, the rad eff. should be 1. However, sometimes MWS calculates rad eff. for a lossles structure which is not 1. This might have several reasons: 1: The structure does (almost) not radiate at th

## CST-radiation efficiency larger than 1 ...?!

Hi, I want to add my consideration about last RFSimulator post. When you calculate your structure down to -30, -40, -50 or more dB, (in the case of lossless structure) you can see that directivity is almost stable; instead gain slowly tends to the directivity. Therefore also rad eff tends slowly to exact value (i.e. 1). Regards

## photonic band gap structure (PBG ) modelling

Hi Irfan and Element7k, Also , I know only that as a first approximation the centre frequency of the band gap will correspond to c/(2*a) , a= spacing between the air gap centers ( unit cells in general ) . How do I actually calculate the entire gap so thatI can make sure that the antenna operating frequency will fal

## Greater than 100% radiation efficiency P@ch antenna in HFSS

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 (...)

## A basic doubt on microstrip p@tch antenna

In some books published in the 90s they sometimes refer to the two dimensions with a distinctive name. The length L is called the Radiation Length. The width W is called the Resonant width. Sometimes the L and W appreviation can swarp around in some texts. Question aries: If the p@tch is square how would one determines which is the leng

## how to calculate ratio fo cmos transistors

1) According to Clein, what has been one of the main reasons why CAD tools have failed to be successful among IC layout engineers? 2) With respect to CAD tools, what are some of the advantanges and disadvantages to being a small IC design house? 3) What is an IC design flow? Why do IC design teams operate within the constraints of design

## Problem with patch antenna design

I'm working on the same project.The problem is how can I calculate the coaxial probe feed radius? If i find the exact feed coordinates, will the radius of probe feed influence on the impedance matching? I am also simulating my desing with CST models the probe feed with a outer and an inner radius cylinder.But I dont know how the values are

## Another Hfss simulation problem

I had the same problem before. The efficiency is just the ratio between the radiated power and the accepted power. And the return los is the ratio between incident power and the accepted power. So, I do is looking to antenna parameter table, Ex: 1) Peak Directivity = 7.6 Peak Gain = 7.79 Peak Realized Gan = 6.05 Radiated Power = 28.58 dBm

## How to measure a dipole antenna

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

## Simulating an RFID tag

Hi, Badlok: The gain calculated in IE3D does consider the mis-match to the normalization impedance. However, you should try to use the conjugate matched gain which will consider the antenna to be conjugately matched. It should be the value you want. Best regards,

## Wideband Antenna Gain Measurement

I don't understand if you have a question or not. In any case a "true" antenna Gain Measurement is certainly one of the most difficult measurement. Moreover, as per every measurement, the difficult increase as required accuracy rise. After this apparently obviously preface, the way i've used is the following: 1) Answer this question: what i

## How to calculate gain from radiation pattern?

its too difficult Is it too difficult to explain or too difficult to calculate. Regards

## Radiation efficiency of microstrip antennas

Hi guys, how do u all calculate the radiation effiecncy???is there any equations? i am using FR4 with Er= 4.6 1 oz loss tangnet = 0.02 like that.. thanks Regards

## <CST MWS> Radiation efficiency of small antennas

Hi, you are absolutely right, there is something wrong in your calculation. I pretty often calculated very short antennas. You have to use lossy material to get a right result. I don't know why but you get a wrong radiation efficiency with PEC. Just pick a slightly lossy material. You might think the difference should not be that big since (...)

## Microstrip Antenna Gain Equations

Hi all, i am new here..I have some questions and i hope i can get some answers here. Thanks a lot.. How do i calculate the gain of a microstrip patch and array antenna? i need the formulas, equations as i need to compare against the measured gain i got. Thanks a lot.. You can use some softaware like cst, hfss...

## HFSS v10 - Patch Antenna Gain & Efficiency Plotting?

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

how you calculate the input impedance of sierpinski gasket or even an equilateral triangular patch???????!!!!!!!!!!!!!! you can put a tiny box on the vertexes,i did it and it was ok,or you can make your dimensions slightly tinier

## 13.56MHz PA for RFID reader reference design.

Another quesiton: We use class E PA because it can provide higher efficiency. But if the load is an inductor such as a coil antenna. Ideally it has no power loss at the load. In this case how to calculate the efficiency?

## Efficiency of a Linear Polarisation Antenna

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

## How to calculate the Antenna gain

sir i m doing project on microwave link planning. i want to calculate the gain of antennas as wel as the latitude and longitde distance in matlab. can any body helps me in this regard. ishall be very thank ful to u. can any body provides me the matlab code or user guide. best wishes. Virus king

## PCB-Antenna at 100MHz. Schematics provided

Hello, I don't exactly understand the setup. If there is no ground plane and the antenna is apparently a monopole, how do you calculate an input impedance respectively s11? Cause it's a "short" antenna, it must have a very low radiation impedance, also probably bad matching and relative high losses. Regards, Frank