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发表于 2008-3-20 21:33:00
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Recommendations
 it is often better not to reduce antenna size too much, if board space allows.
 It is also best to keep some clearance between the antenna and nearby objects. Or the tuning will be difficult and radiation pattern can be heavily distorted.
 Never place ground plane or tracks underneath the antenna
 Never place the antenna very close to metallic objects, such as batteries.
 Be careful about the wiring in the finalized product, not too close to the antenna
 A monopole antenna should have a reasonable ground plane to be efficient.
 Do the final tuning in the end product, not in free air.
 Never install a chip antenna in a vastly different layout than the reference design, and expect it to work without tuning
 Do not use a metallic enclosure or metallized plastic for the antenna
 Test the plastic casing for high RF losses, preferably before production
 Never use low-Q loading components, or change manufacturer without retesting
 Do not use very thin PCB tracks, the tracks should be fairly wide
 If calculate the feeding line impedance depending on the thickness and dielectric constant of PCB when placing layout, it will be convenient to tune the antenna.
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