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Which? Substrate - 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

 Post subject: Which? Substrate
Posted: Wed Dec 28, 2005 2:01 pm 
Please please could someone please suggest an ideal substrate to use on a single element microstrip patch for wireless-LAN applications, resonating at about 2.44Ghz and also why its ideal.

I also want to play with two-element stacked microstrip patch antennas and was hoping someone could tell me wat the common substrates for this are. Low cost substrate is a primary factor in both cases. Thank you so much.

 Post subject:
Posted: Wed Dec 28, 2005 2:20 pm 
FR-4 is used almost exclusively, and is very inexpensive. Check with any of the board fab houses. A couple advertise on RF Cafe (no, I'm not one of them). From a quick look here are the ones I see (might as well support them since they essentially pay for this website). Sorry if I missed a couple. I think they all specialize in quick turn-around and even small quantities.

Electronic Prototypes

Procyon PCB

American Standard Circuits

Gator CAD

Johnny G. in beautiful Wisconsin

 Post subject:
Posted: Thu Dec 29, 2005 9:00 am 
If use FR4 for a patch antenna you will be very dissapointed in the results. FR4 material is a cheaply made material that has loosely held tolerances for dielectric constants and losses. You need to use a microwave material like Rogers 5880.

 Post subject:
Posted: Fri Dec 30, 2005 10:19 am 

Joined: Thu Jul 28, 2005 6:18 pm
Posts: 3
It also depends on the bandwidth you want and the physical size you're looking for. I would recommend Rogers 5880 or Rogers 6010 duroid, though they aren't very cheap in terms of cost. If you're doing this as part of a university research project, you may be able to have them give you some free samples which will be large enough to fabricate the antenna. (Actually, I've done this before and they were very accomodating).

 Post subject:
Posted: Fri Dec 30, 2005 1:32 pm 

FR4 may not be the best material to use. You would find that the efficiency of the antenna would be low compared to other substrates like Rogers 5880 if both the feed network and the patch are on FR4. If you are trying something like an aperture coupled patch, then, you could have the feed strucuture on a lower loss material and the patch/radiating element on FR4, though this would just be complicating the design.

Posted  11/12/2012

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