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2.4GHz patch antenna - 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: 2.4GHz patch antenna
Posted: Fri Sep 30, 2005 3:54 pm 

I'm trying to design a patch antenna for 2.4GHz and I get a 2-3% band width only, does anyone know a way to make the BW bigger?
It should be easy to get 5% of BW but I just don't get it in my simulations.
I use IE3D.


 Post subject: Re: 2.4GHz patch antenna
Posted: Sat Oct 01, 2005 12:48 am 
sag wrote:

I'm trying to design a patch antenna for 2.4GHz and I get a 2-3% band width only, does anyone know a way to make the BW bigger?
It should be easy to get 5% of BW but I just don't get it in my simulations.
I use IE3D.


hi sag:
i am not skillful in ie3d , but i can have a try if you would like to send me your model , and my email is :
i introduce a book :<< Compact and Broadband Microstrip Antennas >>
hope it can be useful .
 Post subject: Patch Antenna Bandwith
Posted: Mon Oct 03, 2005 11:22 am 
I think for a typical patch antenna, you will get about 5% bandwidth if you use the substrate thickness of 5% of the wavelength. If you want to get wider bandwidth without increasing the substrate, which may increase surface wave, you may want to consider stacked patch, aperture coupled patch etc.

 Post subject:
Posted: Fri Oct 07, 2005 3:15 pm 
I used a 125mil substrate with er=2.2 and a typical patch as you get from the basic equations (BALANIS for example).

do you know of a rule of thumb that gives you the relationship between the thickness and the BW?
 Post subject:
Posted: Fri Oct 07, 2005 3:27 pm 
From my experience, for a typical patch antenna with any funcy staff (slot, vias etc), I think the bandwidth is about 1% when the substrate thickness is about 1% of the waveguide wavelength. It is a rough estimation.

 Post subject: BW of a Patch Antenna
Posted: Fri Oct 07, 2005 4:52 pm 

Joined: Thu Jul 28, 2005 6:18 pm
Posts: 3
In the book "Microstrip Antenna Design Handbook" by Bhartia,, figure 9.1 is a plot of %BW vs. substrate thickness and dielectric constant. It only has plots for epsilon of 2.2 and 10, but it can be interpolated rather easily. I've used this chart many times and it gives a pretty good estimate of BW prior to doing the actual design and measurement.

The book is available on Amazon and really is a must have for anyone doing a lot of microstrip patch designs.

 Post subject:
Posted: Fri Oct 21, 2005 10:09 am 
I'll take a look at that figure and try another sim.
10x all.

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