What I need to determine multiband antenna using S11 graph?

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danesh

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multiband antenna

1.can any one explain to me the chracteristics required to determine a multiband antenna using the S11 graph.

2. how to know the impedence of an microstrip antenna if im simulaitng using microwave office?
thanks for ur consideration
 

Re: 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
danesh said:
1.can any one explain to me the chracteristics required to determine a multiband antenna using the S11 graph.

2. how to know the impedence of an microstrip antenna if im simulaitng using microwave office?
thanks for ur consideration
Click to expand...
 

Re: multiband antenna

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
 

Re: multiband antenna

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

or it's only resonator
 

Re: multiband antenna

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.......
 

Re: multiband antenna

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

Re: multiband antenna

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

10q
 

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