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relationship of TEM wave in free space and parallel plates?

 
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ai.xuexi
Antenna Theory Regular


Joined: 01 Jan 2012
Posts: 14
PostPosted: Mon Feb 11, 2013 8:24 am    Post subject: relationship of TEM wave in free space and parallel plates? Reply with quote
relationship of TEM wave in free space and parallel plates?
TEM wave can transmit in free space and also can be in parallel plates.
However, why the TEM wave can not still transmit when a pair of parallel plates open end(open circuit) and it totally reflect?
I think the free space can support the TEM wave.

This problem confuse me sevral years.
any help is welcome
thanks in advance.
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Schubert
Antenna Wizard


Joined: 08 Apr 2009
Posts: 161
PostPosted: Tue Feb 12, 2013 7:57 pm    Post subject: Horn Antenna Reply with quote
The wave on a transmission line is guided by the copper around it. It is different than a wave in free space. To launch the wave you need a transition - this is common with a horn antenna:
http://www.antenna-theory.com/antennas/aperture/horn.php
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