Enquiry about the gain for patch antenna

[saran7507]

gain calculation for patch antenna

Hi All,

I have design a patch antenna for 2.7GHz and the dimension of width and length are 25mm and 25mm respectively. This was done by using CST microwave studio. I get the gain about 6.5dBi in this software.

And I built 2 patch antenna using "brown" copper and attached on both PCB by removing the previous printed copper.

I am testing both patch antenna as transmitter and receiver. The distance is 1.5m. I am transmitting 10dBm and it receive about -38dBm. The cable loss is about -1.67dBm.

I didn't get the nice gain value after calculating from the link budget calculation.

And by using patch antenna calculation through one website, I got the dimension for width and length are 34mm and 26mm respectively.

Which dimension should I follow?


Currently, I am testing both dimensions(25 and 25 , 34 and 26)but still couldn't get nice gain.


Could anybody suggest me how to get the good gain? I am expecting to get about 6dBi.

Waiting for your reply. Urgent!Urgent!

I would be grateful to anyone reply me.


regards,
saran

 

[zirtapoz]

gain of patch antenna calculation

What material are you using?(FR4, duroid, etc)

 

[saran7507]

gain calculation of patch antenna

the material is FR4

 

[saran7507]

Hi All,

Could anybody give me suggestion based on the question that I shoot to you?

Waiting for your reply.

Regards,
Saran

 

[burton]

I think the distance should be increased because the Fariis formula is for far-zone (at least 10*lambda). In addition, the maximum radiation direction of the two antenns should be aligned.

 

[Mazz]

saran7507

6dBi seems a quite high value for a patch in FR4 @2.7 GHz, I would expect roughly 0 dBi.

Did you used the correct substrate loss in CST?
Did you chack for Retrn Loss in simulation and measurement?

Mazz

 

[balaguru thavamani]

Hi saran,

distance between Tx and RX antenna should be 2DxD/lamda

regards,
balaguru.