electronics forum

Rules | Recent posts | topic RSS | Search | Register  | Log in

what's the difference between Gain and Realized gain in HFSS
Post new topic  Reply to topic    EDAboard.com Forum Index -> RF, Microwave, Antennas and Optics -> what's the difference between Gain and Realized gain in HFSS
Author Message
fishyxl



Joined: 01 Dec 2004
Posts: 66
Helped: 2
Post20 May 2006 13:34   

realized gain vs gain hfss
Recently, I'm simulating an antenna using HFSS. And I found Gain and Realized gain. I read the manual but do not understand. I think Realized gain is the gain we usually refer to. But what does the Gain in HFSS stand for? Please give me some instructions. Thank you.
Back to top
kyjackchan



Joined: 12 Aug 2004
Posts: 28
Helped: 2
Post22 May 2006 3:14   

Re: what's the difference between Gain and Realized gain in
Hi,

First u need to understand the following

incident power (Pinc) = 1W
accepted power (Pacc) = Pinc * (1 - s11^2 ) (ie mismatched loss)
radiated power (Prad) = Pacc * radiated efficiency

and the gains are calculated as followed:

realised gain = 4piU / Pinc
gain = 4piU / Pacc
Directivity = 4piU / Prad

If you think carefully, realised gain is smaller than gain. But of course realised gain has included all the facts that an antenna has some mismatching loss and loss in efficiency. While gain and directivity excludes one of these losses respectively.
Back to top
fishyxl



Joined: 01 Dec 2004
Posts: 66
Helped: 2
Post22 May 2006 12:49   

what's the difference between Gain and Realized gain in HFSS
But which is the gain we mostly refer to, GAIN or REALIZED GAIN??
Back to top
Google
AdSense
Google Adsense
Post22 May 2006 12:49   

Ads


Back to top
kyjackchan



Joined: 12 Aug 2004
Posts: 28
Helped: 2
Post23 May 2006 2:35   

Re: what's the difference between Gain and Realized gain in
Given that you are measuring your 'gain' through your 50ohm coaxial cables, you will experience some mismatched loss and loss in radiation efficiency in your antenna system. So I think realised gain is what you expected to be measured.
Back to top
fishyxl



Joined: 01 Dec 2004
Posts: 66
Helped: 2
Post24 May 2006 8:27   

what's the difference between Gain and Realized gain in HFSS
I see. Thank you!
Back to top
Arabic versionBulgarian versionCatalan versionCzech versionDanish versionGerman versionGreek versionEnglish versionSpanish versionFinnish versionFrench versionHindi versionCroatian versionIndonesian versionItalian versionHebrew versionJapanese versionKorean versionLithuanian versionLatvian versionDutch versionNorwegian versionPolish versionPortuguese versionRomanian versionRussian versionSlovak versionSlovenian versionSerbian versionSwedish versionTagalog versionUkrainian versionVietnamese versionChinese version
Post new topic  Reply to topic    EDAboard.com Forum Index -> RF, Microwave, Antennas and Optics -> what's the difference between Gain and Realized gain in HFSS
Page 1 of 1 All times are GMT + 1 Hour
Similar topics:
Gain and Realized Gain has any difference? (3)
What’s the difference between Noise Gain & Signal Gain o (2)
what is the difference between loop gain and close loop gain (11)
small signal gain, large signal gain, what's the difference? (6)
difference between large signal gain and small signal gain (6)
Realized gain and directivity (2)
Realized gain and directivity (1)
Gain differences between HFSS simulation and test results (5)
What's the difference between '#5 a = b;' and 'a = #5 b;'? (3)
the relationship between fs and DC gain Ao. (1)


Abuse || Administrator || Moderators || Support us || sitemap
topic RSS