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RIPPLE on radiation pattern due to SURFACE WAVE

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hamidmoghaddas

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surface wave can cause distortion in form of ripple on antenna pattern.

can anybody explain how the ripple is, exactly?
any reference explaining it?
any figure to show that?
 

Hello Hamid.. !

Can you explain exactly what you said about the 'antenna pattern' ? - is it the far field radiation pattern ?

I think you mean the near filed radiation pattern - which depends on the geomtrical structure of the given antenna.

But surface plane wave exists at the far field of the antenna (when they far away in several wavelengths).

Thanx !
 

hi
i guess, farfield
in an IEEE transaction by DAN SIEVENPIPER titled HIGH IMPEDANCE EM SURFACE USING EBG he mentions the sentence but without any reference: surface waves if scattered, caues distortion in pattern in form of ripple.
DISTORTION AND RIPPLE seem ambiguous to me.
ok?
 

Hello !

I think he means by Ripples that the far field doesn't have a smoth curve of charactersitic and, due to scatterd surface waves, this far field pattern has a noisy (distorted) pattern.

Thinks of it as an unwanted noise reflected from the antenna as shown at far field pattern image attached.

If you have something else to show me - you're more then welcome.

Itzik !

P.S.
the far field pattern was taken from 3rd edition of Antenna Thoery of Balanis C.
(Last chapter of measurements antenna's paramters)
 
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