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I have one antenna (nr 1) that is matched good. the circle in smith chart goes thru 1. It has a narrow bandwidth so it is bad matched beside the resonate frequency. If I had one other antenna (nr 2) thats is good matched for many frequencies inside the frequency band 3GHz +- f MHz. The circle...

When I have done a parameter sweep in cst I usually look at the S11 parameter. If I got 2 curves at the S11 figure simulated by the parameter sweep. How did I get both curve into the same smith chart. /Thomas

Few questions about TM modes I hope someone want to answer Can someone explain why only TM mode can exist in the rectangular waveguide that the patch antenna create. I read about it in balanis antenna theory but didn't understand enough. A other question about the TM(hLW) mode. How are the...

Can someone explain the theory why truncated corner can give circular polarization? Anyone knows any articels or books there I can read about it?

Did anyone know were I can buy foam or similarly substance?

I have look at some design of zigbee.

The antenna are going to sit on a train, It will comunicate with a RFID tag beside the rail and a gateway on the train

I want to build a antenna of this condition. what type of antenna did you recomended *much metal in the environment *will sit on vehicle for hight speed max 200km/h *dual band 868Mhz( Rfid),2,25GHz *smal max (w*L*H) 5cm*10cm*2cm *range max 15-20m *circular polarized