[question] About wideband CP antenna

[caocao]

Hi every one,
I have to face questions in designing a wideband (from 1.2 to 2.4GHz) circularly polarized planar antenna with small size (a 4X4 square inch area).I had thought about for a few days but have no ideas
Would someone give me some advices or papers on it?
Thanks!
Regards!

CaoCao

 

[vfone]

Embedded narrow slots in microstrip antennas can give a circular polarization (the angle of the slot can give you LHCP or RHCP).
Using multi-resonance broadband patches can increase your bandwidth, but to make an antenna to work from 1.2GHz to 2.4GHz would be a challenge.
**broken link removed**
**broken link removed**

 

[caocao]

Embedded narrow slots in microstrip antennas can give a circular polarization (the angle of the slot can give you LHCP or RHCP).
Using multi-resonance broadband patches can increase your bandwidth, but to make an antenna to work from 1.2GHz to 2.4GHz would be a challenge.
h**p://www.ece.uvic.ca/~jbornema/Conferences/102-04aps-kabs.pdf
h**p://www.ece.uvic.ca/~jbornema/Conferences/101-04aps-ktb.pdf

Thanks for vfone's papers
On the other hand,should we design a circularly polarized antenna works from 1.2~2.4GHz with two layer and patch were stacked?
Regards!