patch antenna excitation

[smnobo]

Dear freinds,
my problem is: why the almost microstrip line used as the feed line for the patch antenna are 50 Ohm? i ask you also if we can use other 74 Ohm feed line excitation for this antenna?
thanks for your help....

 

[Darren_pan]

fix antenna excitation

i think you can use 74 Ohm feed line to excite the antenna. Using the 50 Ohm became our custom. lots of equitments support the 50 Ohm...

 

[smnobo]

thanks, so please can you tell me how we can determine the input impedance for the UWB antenna, so here we have a broad band frequency, and we know that the input impedance is calculated for a single frequecy. i ask you please to explain me this problem & send me if you have some theoretical doc. thank you very much
happy new year for you and for all our freinds on the edaboard forum...