A batch of questions here really (if it helps I'm operating at 433.92MHz):
- How should I orient a helical antenna with respect to my board (i.e. my "ground plane") to get the best range performance?
- What should the dimensions of my ground plane have to be in order to get good performance / how much does this matter compared to orientation?
- I'm also wondering what effect (if any) the relative orientation of these types of antennas between the transmitter and receiver has on link quality (due to polarization?).
Is the antenna pattern directional for these types of antennas (related to 3), and if so how narrowly?
Sorry if this question is a little bit all over the place - I've got an EE background, but RF can be kind of mysterious (if you know what I mean)...
[Edit] 3-d visuals would be really helpful in helping me get my head around this as well [/Edit]
[Edit2] 5. Going to attempt some ASCII art here - what's the best way to mount my antennas? slashes (/) are the helix orientation, underbars (_) are the ground plane, and vertical bar (is the feed point):
Transmitter Receiver **A** / / / / / / / / ____|____ ____|____ **B** //////// //////// _|_________ _|_________ **C** //////// //////// _|_________ ________|__ **D** / / / / //////// ____|____ _|_________ **E** / / / / //////// ____|____ ________|__