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Proximity Coupled X -Band Array Patch Antenna with Dual Polarization for Weather Rada

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hero617

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Hi there,

I cannot reach my target resonant frequency at 9GHz. The highest I can get for this design using FR4 is at 7.6GHz but dual polarization only occurs around 6GHz. I have tried to increase and decrease the length and width of the patch of my array antenna but the highest value I can go is 7.6GHz. Any shape that I can use to increase my resonant frequency instead of focusing on the size of the radiator. By the way, I am doing orthogonal feeding to make it dual polarized. View attachment Attachment Antenna 1.pdf Please refer to the attachment of my antenna design. thanks!:wink:
 

Hi,
Your feed look like strange. But to begin, you can only, with your software (CST ?) feed with ports at 90 phase shift you antenna array. Then , size you antenna to obtain the right resonant frequency. Better, size only one patch and after build your array. I think that at 9 Ghz the efficiency of your array will not be good with FR4 but normally you can reach the 9 GHz frequency.

Bye.
 

eraste said:
Hi,
Your feed look like strange. But to begin, you can only, with your software (CST ?) feed with ports at 90 phase shift you antenna array. Then , size you antenna to obtain the right resonant frequency. Better, size only one patch and after build your array. I think that at 9 Ghz the efficiency of your array will not be good with FR4 but normally you can reach the 9 GHz frequency.

Bye.
Click to expand...

Hi there,

Thanks for your reply. I am able to get 9GHz already but with 1x2 Array. However, it is true that by total efficiency of my both port is -3.9 to -4.5 and is very bad. Since like you've said I am using FR4, I am no choice but to use FR4 since I got that funded but not funded for duroid. Thanks by the way. I did try to change the location of coaxial port to increase the total efficiency. But there is too small area for me to allocate my coaxial port and hence I can't change much. By the way, what will happen if my total efficiency of both port is high? Is it going to cause anything during my measurement?
 

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