[SI-LIST] Re: AW: Patch Antenna Design for UHF RFID reader

Hi,

Thanks Gert.

Can anybody comment on the typical Beam Widths that we can get with 
microstrip patch antennas?

Aslo Its my first antenna design & I have not worked with any simulators. 
From where can I download the free trial versions for CST or HFSS?

I have already done a bit of reaserach regarding the patch antenna designs. 
I have downloaded some papers from IEEE also. But any suggestion or 
recommendations for any good applications notes on this subject will be of 
great help.

Regards,
Vinod

----- Original Message ----- 
From: "Havermann, Gert" <Gert.Havermann@xxxxxxxxxxx>
To: <si-list@xxxxxxxxxxxxx>
Sent: Thursday, March 12, 2009 9:15 PM
Subject: [SI-LIST] AW: Patch Antenna Design for UHF RFID reader


> Hi Vinod,
>
> Ist been a while since I did my last patch antenna, but since noone is 
> responding I'll give it a shot.
>
> I don't see a problem with a microstrip patch antenna at the given 
> bandwidth and RF power level. The gain might be hard to meet over the 
> whole bandwidth, but should be ok with proper simulation. I prefer 
> microstrip patch antenna because ist quite easy to build. For metal patch 
> antennas you have to deal with a lot of tolerances (btw Aluminum works 
> good for those antennas).
>
> If you use an 3D simulator (CST, HFSS...) most of them come with examples 
> in patch antenna design. Sometimes those are a great starting point. If 
> you go down the first option, take a look at GIL1000 PCB material. Ist 
> perfect for antennas, and might help you to get the gain up to where it 
> belongs.
>
> Just my 2ct
>
> BR
> Gert
>
>
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> Von: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] Im 
> Auftrag von Vinod Kumar
> Gesendet: Donnerstag, 12. März 2009 08:12
> An: si-list@xxxxxxxxxxxxx
> Betreff: [SI-LIST] Patch Antenna Design for UHF RFID reader
>
> Hi All,
> I want to design a patch antenna for UHF RFID reader. There are two 
> options:
>
> 1. A microstrip patch antenna but the bandwidth will be less with this 
> antenna.
> 2. A patch antenna with metal plates which can provide more bandwidth.
>
> My requirements are:
>
> A circularly polarized patch antenna with 6~9 dBi gain and 865 - 867MHz 
> bandwidth cover. Antenna should be able to radiate +30dBm (1W) RF power.
>
> Can anybody suggest which option will be good?
> Also where can I find good application notes for patch antenna design?
>
> One more doubt I have here is how to select the metal for 2nd option. 
> Which material will be best suited for this?
>
> Regards,
> Vinod
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