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121 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.
Electromagnetic Design and Simulation :: 19.02.2007 22:24 :: pass1 :: Replies: 2 :: Views: 2338
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, (...)
RF, Microwave, Antennas and Optics :: 26.11.2008 09:02 :: cplia :: Replies: 4 :: Views: 921
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 (...)
Electromagnetic Design and Simulation :: 01.06.2005 16:47 :: heedavid :: Replies: 3 :: Views: 1021
Hi All,
How can I calculate the efficiency and gain of an patch antenna modeled in HFSS?
Regards,
-- Soyuz
Electromagnetic Design and Simulation :: 12.09.2006 07:16 :: Soyuz :: Replies: 3 :: Views: 1431
hello everyone,
anyone know how to calculate the efficiency in percent using cst?
hope u all can help me.
regards,
kyg
Electromagnetic Design and Simulation :: 19.08.2008 10:31 :: kyg :: Replies: 4 :: Views: 1312
@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 %? (...)
RF, Microwave, Antennas and Optics :: 17.09.2010 04:51 :: spid3rx :: Replies: 3 :: Views: 2483
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 (...)
RF, Microwave, Antennas and Optics :: 28.05.2012 13:56 :: Sriram@measureindia :: Replies: 2 :: Views: 467
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
Electromagnetic Design and Simulation :: 28.05.2013 23:01 :: FvM :: Replies: 16 :: Views: 232
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
RF, Microwave, Antennas and Optics :: 18.02.2004 10:44 :: mnieder :: Replies: 2 :: Views: 560
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!
RF, Microwave, Antennas and Optics :: 24.06.2004 14:09 :: ruth :: Replies: 8 :: Views: 1190
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 (...)
Electromagnetic Design and Simulation :: 28.01.2005 09:09 :: gaotang :: Replies: 1 :: Views: 869
How we calculate the gain of antenna?
high gain antenna is highy directional antenna?
the gain of Yaggi antenna is zero?
Electronic Elementary Questions :: 26.12.2005 12:34 :: mani_sohail :: Replies: 2 :: Views: 1134
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
RF, Microwave, Antennas and Optics :: 14.01.2006 15:49 :: g86 :: Replies: 6 :: Views: 1374
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 (...)
RF, Microwave, Antennas and Optics :: 09.07.2007 21:12 :: sinatra :: Replies: 16 :: Views: 1284
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 (...)
Electromagnetic Design and Simulation :: 24.01.2008 02:06 :: harishbigh :: Replies: 1 :: Views: 1766
hi
plz tell me how can i calculate the copolarazation and crosspolarization level of antenna,efficiency,3dB beamwidth etc. parameter of antenna in HFSS.
Electromagnetic Design and Simulation :: 22.08.2008 06:00 :: ravi8331 :: Replies: 2 :: Views: 1857
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.
RF, Microwave, Antennas and Optics :: 14.01.2011 22:46 :: FvM :: Replies: 25 :: Views: 1863
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 (...)
RF, Microwave, Antennas and Optics :: 23.03.2011 06:28 :: riyadhe :: Replies: 21 :: Views: 1079
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. (...)
RF, Microwave, Antennas and Optics :: 20.08.2011 09:33 :: aruna1 :: Replies: 10 :: Views: 2006
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
RF, Microwave, Antennas and Optics :: 31.08.2011 20:58 :: WimRFP :: Replies: 8 :: Views: 1205
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 (...)
RF, Microwave, Antennas and Optics :: 26.02.2012 01:18 :: E Kafeman :: Replies: 8 :: Views: 693
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.
RF, Microwave, Antennas and Optics :: 29.05.2012 18:54 :: amanda. :: Replies: 5 :: Views: 490
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
Electromagnetic Design and Simulation :: 04.06.2013 21:26 :: ghasem_008 :: Replies: 14 :: Views: 243
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 (...)
RF, Microwave, Antennas and Optics :: 16.09.2002 14:33 :: zeese :: Replies: 6 :: Views: 2895
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
RF, Microwave, Antennas and Optics :: 04.02.2003 02:09 :: sick_man :: Replies: 4 :: Views: 930
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
RF, Microwave, Antennas and Optics :: 05.06.2003 21:33 :: luben111 :: Replies: 11 :: Views: 9874
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
Electromagnetic Design and Simulation :: 30.08.2003 03:27 :: goxy :: Replies: 11 :: Views: 3277
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
RF, Microwave, Antennas and Optics :: 20.04.2007 23:46 :: SAJ25 :: Replies: 70 :: Views: 14403
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.
Electromagnetic Design and Simulation :: 08.04.2004 01:44 :: loucy :: Replies: 12 :: Views: 1091
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
Electromagnetic Design and Simulation :: 21.04.2004 20:38 :: eirp :: Replies: 12 :: Views: 3183
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
Electromagnetic Design and Simulation :: 25.04.2004 17:17 :: yuyu :: Replies: 4 :: Views: 1470
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
Electromagnetic Design and Simulation :: 21.08.2004 14:26 :: svarun :: Replies: 10 :: Views: 3654
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 (...)
Electromagnetic Design and Simulation :: 29.10.2004 16:53 :: svarun :: Replies: 16 :: Views: 5395
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
Electromagnetic Design and Simulation :: 20.12.2004 23:21 :: sassyboy :: Replies: 10 :: Views: 907
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
Analog IC Design and Layout :: 16.02.2005 12:05 :: ikru26 :: Replies: 37 :: Views: 12024
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
RF, Microwave, Antennas and Optics :: 14.03.2005 22:38 :: leony :: Replies: 4 :: Views: 1028
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
Electromagnetic Design and Simulation :: 12.08.2005 20:54 :: jallem :: Replies: 4 :: Views: 985
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
RF, Microwave, Antennas and Optics :: 29.09.2005 12:27 :: VSMVDD :: Replies: 5 :: Views: 1266
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,
Electromagnetic Design and Simulation :: 03.01.2007 17:02 :: jian :: Replies: 29 :: Views: 6344
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
RF, Microwave, Antennas and Optics :: 28.12.2005 22:05 :: sergio mariotti :: Replies: 8 :: Views: 1272
its too difficult
Is it too difficult to explain or too difficult to calculate.
Regards
Electromagnetic Design and Simulation :: 14.04.2007 22:13 :: snkhan :: Replies: 9 :: Views: 2076
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
RF, Microwave, Antennas and Optics :: 11.08.2006 06:05 :: goo :: Replies: 26 :: Views: 2379
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 (...)
Electromagnetic Design and Simulation :: 04.07.2006 19:13 :: elomatic :: Replies: 8 :: Views: 2340
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...
RF, Microwave, Antennas and Optics :: 06.08.2006 21:08 :: hans_mauritz :: Replies: 8 :: Views: 2132
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
Electromagnetic Design and Simulation :: 14.09.2006 02:41 :: Soyuz :: Replies: 2 :: Views: 962
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
RF, Microwave, Antennas and Optics :: 18.09.2012 09:17 :: sahar1362 :: Replies: 29 :: Views: 3892
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?
RF, Microwave, Antennas and Optics :: 23.12.2006 21:43 :: yolande_yj :: Replies: 22 :: Views: 14114
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
RF, Microwave, Antennas and Optics :: 31.01.2007 11:51 :: petrus999 :: Replies: 2 :: Views: 584
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
RF, Microwave, Antennas and Optics :: 29.07.2007 10:41 :: Virus King :: Replies: 2 :: Views: 1096
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
RF, Microwave, Antennas and Optics :: 30.01.2008 17:20 :: FvM :: Replies: 23 :: Views: 2425
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