How a wrong embedded antenna design could look like? EAD#

By Harald Naumann - Last updated: Friday, April 26, 2013 - Save & Share - Leave a Comment

Embedded antenna design mistakes

The GSM antenna structure at the picture is a shape that normally is in use with PCB antennas and coaxial cable. Such antenna structures are optimized on 4 to 8 cm distance to ground plane. A further design mistake is the ground area left and right of the antenna. Radio waves are travelling like light. The antenna is the “candlelight”. The ground area left and right will build shadows for the radio wave. The antenna  structure is to close to ground plane and the connector is to close to the embedded antenna as well. Worst case the embedded GSM antenna will interfere with the GSM module. The GSM 900 part on the border of the PCB is very close to the plastic enclosure as well. The to close plstic enclosure will generate a parasitic load again. The blue marked area shows the “visible” ground plane of the antenna. Embedded GSM antennas like GSM chip antennas or embedded GSM PCB antennas are looking for 40 mm to 90 mm up to 40 mm to 110 mm ground plane. The blue aera has a size of estimated 40 mm x 30 mm.

Embedded GSM antenna on minimized ground plane

wpid Embedded Antenna GSM Antenna ground plane1 300x234 How a wrong embedded antenna design could look like? EAD#

Embedded antenna and its ground plane

Read more: How will the ground plane effect your embedded antenna?

How to optimize this embedded GSM antenna design?

Start with reading here:

Nothing will interfere your embedded antenna?

And read all linked chapters!

GSM PCB antenna recommendations based on the picture

Not checked (details missed)

This embedded design example has reach us, after finishing the first PCB. It is better to go the other way around. In the first step you tell the size and material of the enclosure. In second step a RF consulter will make a proposal for the antenna. The best and cheapest result you get, if you select the embedded antenna first and design the product around. Even better is, to give the freedom on a resonable size for a ground plane.

If you still not sure which antenna to select and why, then do not hesitate to drop an email to harald.naumann (at) gsm-modem.de

Posted in M2M FAQ, hints, tips • Tags: Top Of Page

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