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Rectangular Patch Antenna Design - RF Cafe Forums

The original RF Cafe Forums were shut down in late 2012 due to maintenance issues. Original posts:

Amateur Radio | Antennas | Circuits & Components | Systems | Test & Measurement


jrk
 Post subject: Rectangular patch antenna design
Posted: Mon Jan 22, 2007 6:44 am 
 
Lieutenant

Joined: Mon Jan 22, 2007 6:08 am
Posts: 2
Hi,

I'm in the process of designing a simple microstrip rectangular patch antenna. I intend to feed the structure by using a co-axial wire inserted through a hole in the ground plane, and substrate. I understand that the (0,1) and (0,3) modes of a rectangular patch resonator both exhibit broadside radiation and the same polarization. But what exactly is meant by (0,1) etc.? Also I presume that one can only excite these two modes if the antenna is dimensioned correctly and fed in the correct location. Could anyone elaborate on what is required?

I have found a formula than can be used to determine dimension L. But didn’t find such formula for W. I understand that W must be less than a wavelength in the substrate material, in order to avoid the excitation of higher order modes. Aside from this limitation can/should one dimension W arbitrarily? Several of the rectangular patches in the literature seem to have a L/W ratio of about 0.75, is there a reason for that?

Thanks

_________________
James


 
   
 
jrk
 Post subject: A tutorial answering my questions
Posted: Thu Jan 25, 2007 4:19 am 
 
Lieutenant

Joined: Mon Jan 22, 2007 6:08 am
Posts: 2
For anyone who’s interested in this I found answers to my questions in a really well written tutorial on the RF globalnet site.

Title: The Basics Of Patch Antennas
By: Orban Microwave Products

Thanks,
James

_________________
James


 
   
 
nubbage
 Post subject:
Posted: Fri Jan 26, 2007 1:12 pm 
 
General
User avatar

Joined: Fri Feb 17, 2006 12:07 pm
Posts: 218
Location: London UK
Hi jrk
Thanks for that.
I tried to put a reply together based on articles I have culled from various tech pubs, but the guys writing the papers just wanted to goof off sprinkling bessel integrals all over the place, which wasn't much use to answer your very apposite question.

I have often needed design curves for various patches such as dual frequency, various bandwidths etc but never could find a straight forward kitchen sink treatment.

Thanks again






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