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Onboard 50 ohm GSM antenna design.

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kcagiran

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Hi, i am working on gsm tracking and phone device, using GSM and GPS on same device. But i am using extended antenna for GSM and GPS connection separately. Now i would like to implement onboard antenna like F for GSM connection. But the problem is my device needs to has strong GSM connection. Can i use 50ohm typical F antenna design, or can you offer me an on board antenna design?
 

For single band GSM, a standard Inverted-F antenna should be fine for your application.
For dual-band GSM application, may need to use a PIFA antenna (Planar Inverted-F).
 

thanks for replying, designing F antenna is complex and hard, can i find and library for eagle? I mean ready to use F antenna design?
 

Using such "library antennas" is a problem because antenna matching also depends on the PCB ground layout (and size) and other enviroment near the antenna.

A while ago I wrote an appnote to show that de-tuning: https://muehlhaus.com/support/antenna/pcb-em

So a library antenna is not "ready to use" in many cases, and planar F antennas are indeed more difficult to tune because the grounded tap is realized in layout and cannot be tweaked so easily.
 
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