I've been looking at various options for short-range transmissions
at 434MHz. Less than 100m line-of-sight will do

So far I've tried 1/2 wave (345mm), 1/4 (172mm) and 1/8 (86mm)
straight aerials, using both copper and aluminium. 1/2 is best although
1/8 is still pretty good, apart from a couple of dead spots at 100m

One application I'm evaluating would benefit from internal aerials.
This could either be an 1/8 or a PCB trace. PCB trace would be
preferable. My thought is to use a short link from the fixed-position
user to a repeater. The repeater can have a 1/1 or 1/2 wave aerial
to broadcast the longer range to the end receiver. This receiver
should also have an unobtrusive aerial (PCB preferably), and I'm
hoping that the power output of a repeater with its better gain aerial
will be picked up more reliably with this internal aerial than from the
user's short range transmitter

I've Googled 434MHz aerial PCB and found this document, which
has several 434MHz examples. The Bode plots are very helpful

http://www.rfm.com/corp/appdata/antenna.pdf

Opinions and suggestions please ?

TIA

Joe

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