multiband antenna

Hi danesh,

for multiband say for example you want GSM, DCS, UMTS band; 890-960MHZ, 1710-1880MHz, 1920-2170 Mhz respectively, and you have a requirement that might be a VSWR of 1:2 i.e. S11 in these frequency return loss < 10 on the S11 graph. Return loss is plotted against frequency.

I have not used uwave office but you should be able to find a smith chart that will tell you the impedance.

Hope this helps.

Cheers,
Element7k

HI
The S11(Return loss) of multiband patch antenna likes this figure.It's is a double band microstrip antenna,you can find there are two least RL point at 1.4 and 2.3GHz.
CaoCao

antenna multiband must be sure that multiband have gain...

or it's only resonator

besides the 2 RL minimums,in order to be a multiband antenna both radiation patterns at those frequecies should be similar and have a decent gain.......

Multband is really a intresting technology!Who can give me some designs about it ?
TX in advance!
My email:zhangfeilong433@sohu.com

Hi caocao,
Do you have the design of the antenna which have the s11 plot you provided?

10q