# one single p atch antenna gain

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#### kjackhu

##### Newbie level 4
Can someone help me about one single p atch antenna gain?
Some one tell me the gain is like dipole only have 2~3 dbi gain.
But I see the manufactuer give me the gain is 6 ~8 dbi.
Why to make the big difference?

#### purushottam

##### Member level 2
A simple rectangular patch (Bahl & Bhartia) gives 6.6 dBi gain.

#### bingjiang99

I have been doing a lot of microstrip antennas recently. It really depends on the substrate, size, and shape. Radiation efficiency should be in your consideration as well. I saw as high as 8-9 dbi and as low as 1 dbi.

#### tomcat_x

##### Member level 1
for application you want ,

normally , to meet the FCC rule .

in ISM band , for 2.4 GHz , the max gain is 3dbi

5 GHz , the max gain is 6dbi

note : the gain for reference is usually a peak gain

but , the average gain is also important .

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