How to design small GSM/DCS PCB antenna ?

[yellowtooth]

I want to lay a GSM/DCS antenna directly to PCB.

So the size of it should not be too large.

Attachment is my design.

The resonate frequency is just tunable, and can be the point I want.

But the bandwidth is too narrow.

What sould I do next ?

Any other desing ?

Thank U.

 

[yellowtooth]

I have designed the IFA successfully for Bluetooth.

But the GSM&DCS frquency is too much lower than Bluetooth.


So, I think, the size maybe too large.

Is there any method to desing small IFA for GSM&DCS ?

Thank U.