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Electronics => RF, Microwave, Ham Radio => Topic started by: madhu.wesly01 on August 11, 2018, 07:13:25 am

Title: Chip antenna
Post by: madhu.wesly01 on August 11, 2018, 07:13:25 am

Hi,

  I am planning to include GPS chip antenna in my design , regarding the placement it says we have to follow some considerations like

       1. They mentioned some keepout Area 5X5mm  surrounding that antenna .
 
            As I've size constrain I'm placing 5mm keepout area on one layer of the board and the other layer I'll keep 3mm keepout area .

          How much it will impact on the GPS signal reception ?  and It will be greatful if anyone suggest me to overcome that issue ?

Thanks in advance .
   

Title: Re: Chip antenna
Post by: ThomasDK on August 11, 2018, 11:06:09 am

Hard to say, if you do not follow the guide lines you are on your own. All antenna specifications are out of the window, as the gap itself is part of the antenna.

Title: Re: Chip antenna
Post by: D3f1ant on August 11, 2018, 09:11:43 pm

I'm doing something similar at the moment. I started by using a chip antenna that had design examples that at least closely resembled how I needed to use it. Some GPS chip antenna data was hopeless , it made wonder how they manage to sell anything with such inadequate datasheets, no application examples or other app notes.
I added a provision for a basic 3 element pi matching network, following that up with a SAW and LNA. In my experience small GPS chip antenna performance is terribly compared to ceramic patch antennas.