PCB Patch Antenna at 200MHz size

[vreg]

Hi,

I'm looking to design a microstrip antenna operating at 200MHz :

The calculations for length and width for a rectangular patch come out to be 0.34m and 0.44m...

Is there any way/technique to reduce the patch size while operating at the same frequency?

Thanks.

 

[volker@muehlhaus]

Is there any way/technique to reduce the patch size while operating at the same frequency?

Ceramic substrate with (very) high permittivity can be used for shrinking.

Example: **broken link removed**

 

[hagster]

You can just load the edges with a high permitivity material rather than the full substrate as this would be expensive and heavy for such an antenna. The downside is that it makes it harder to design.

 

[rizwan183]

You can use PIFA type antenna to reduce the size. But gain depends on efficiency for patch type antennas. height should not be less than 0.025*lambda to get good gain. I will recommend IFA type antennas with smaller size and good gain.

 

[vreg]

Hi,

Thanks for your replies...

Designing PIFA seems to be a good option for me.

antenna-theory.com says that the length of width of the patch (for a PIFA) should add up to lambda/4,
i.e. W + L = lambda/4

In this case, can we choose any length/width such that they add up to lambda/4?

 

[FvM]

You should consider the prerequisites of the PIFA design equations.

As any λ/4 antenna, it's operation depends on the existence of a (theoretically infinite) ground plane, at least a plane that's large compared to the antenna.