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siwowox de santos
Joined: 25 Sep 2007
Posts: 71
Location: INDONESIA ku cinta
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 19 Jul 2008 4:29 [ask] about specification of WLAN antenna? |
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hi all,
i want to ask u about specification of WLAN antenna such as return loss, VSWR, gain, Frequency resonance, and the bandwidth.
Thx b4
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RF-OM
Joined: 03 Aug 2007
Posts: 607
Helped: 113
Location: The Earth
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| 19 Jul 2008 7:22 Re: [ask] about specification of WLAN antenna? |
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VSWR and return loss are practically the same parameters. VSWR is historically older because S-parameters were introduced by Kurokawa only in 1965 and become widely used many years later. You may consider S11 about -10 dB as acceptable level with anything below -15 dB as excellent. Often even -6 dB is okay, especially for broadband systems.
Gain is related to the directionality and cannot be chose arbitrary. It is not so easy question to be answered shortly.
Frequency resonance is very specific. For some antennas it is normal mode of operation, whereas for other it must be avoid. There is no one answer for all possible cases.
Bandwidth is defined by the spec and can be determined by design. It may be not always realizable, but at least designer have some freedom to change the numbers.
There are also a lot of other antenna parameters that are critical to the system performance.
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siwowox de santos
Joined: 25 Sep 2007
Posts: 71
Location: INDONESIA ku cinta
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| 20 Jul 2008 1:46 Re: [ask] about specification of WLAN antenna? |
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in this time, i wnat to design WLAN antenna b/g type. it work at 2.4-2.483GHz
and i dont know the spec of it..
thanks b4
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balaguru thavamani
Joined: 08 Nov 2006
Posts: 244
Helped: 27
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| 21 Jul 2008 11:37 Re: [ask] about specification of WLAN antenna? |
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Depending upon the application of antenna, gain varies.For hand held devices normally it'll be around 2dBi gain and it should have omnidirectional pattern.Eg for this case is PIFA type of antenna
For base station application gain will be around 20dBi and it will be a directional antenna.Eg for this case is patch antenna(array).
For further more details on specification you can check out websites of different antenna vendors.Attached here is one from centurion antennas
regards,
balaguru.
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siwowox de santos
Joined: 25 Sep 2007
Posts: 71
Location: INDONESIA ku cinta
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| 22 Jul 2008 12:39 Re: [ask] about specification of WLAN antenna? |
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thank's guys
but in thsi time i want to design proximity coupled antenna the 1st layer is triangular patch and the 2nd layer is transmission line using T-junction like a fork. it design for WLAN b/g in 2.4 GHz n i dont know the spec for this antenna? do you tihink the spec is same with pifa?
thank guys
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