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GSM 1900 Patch Antenna help - RF Cafe Forums

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Marc_in_NoCal
 Post subject: GSM 1900 Patch Antenna help
Posted: Tue Mar 18, 2008 6:50 pm 
 
Lieutenant

Joined: Tue Mar 18, 2008 6:39 pm

Posts: 2

Hi,

I am looking to buy this Patch Antenna for my AT&T wireless cellphone:

http://www.hyperlinktech.com/web/1.9ghz ... a_8dbi.php

but, I know that ATT goes down to 1850, but this Antenna is spec'ed to 1880.

does anyone know this Antenna is OK for ATT's high band GSM?

Or if not, does anyone has a suggestion on similar Patch Antennas that would work for ATT's high Band GSM service?

thanks in advance for any information,

Marc


 
   
 
RFBites
 Post subject:
Posted: Sun Mar 23, 2008 6:30 pm 
 
Lieutenant

Joined: Sun Mar 23, 2008 5:59 pm

Posts: 2

Location: Lafayette, CO

Hi Marc,

You might want to request the VSWR or Return Loss plots for this antenna from 1850 - 1990MHz from HyperLink. My guess is that the return loss starts to get bad at the lower frequency, which translates into a poor match for your power amplifier. At it's worst, a poor match could cause your power amplifier to fail due to a high VSWR. Other than that, you will start to loose gain, and have a power mismatch between your uplink and downlink.

Just a hunch, but if Hyperlink had the ability to spec this antenna down to 1850, I'm sure they would have done it, or they are really missing a good market.

You may want to keep shopping around.

Best Regards,

_________________

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nubbage
 Post subject:
Posted: Tue Mar 25, 2008 6:06 am 
 
General
User avatar

Joined: Fri Feb 17, 2006 12:07 pm

Posts: 218

Location: London UK

A simple patch antenna only has a bandwidth (VSWR <= 2:1) of 2%.

There are ways to broaden this by overlaying patches that are isolated electrically, and using resonant apertures etc, but I do not believe Hyperlink equipment incorporates these ideas (yet) as standard.


 
   
 
Marc_in_NoCal
 Post subject: thank you very much for these information. [nt]
Posted: Wed Mar 26, 2008 3:29 pm 
 
Lieutenant

Joined: Tue Mar 18, 2008 6:39 pm

Posts: 2

...

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