Array Antenna Amplitude Tapering for SLL Reduction

[farzanehjun]

Hi every one
I designe waveguide slotted array with -27.5 dB SLL in CST,
when I fabricate and test it
SLL increase to -25 dB
Have any one information about space tapering or other methods to reduce SLL in simulation?

 

[sso]

it may be because of your fabrication tolerance.

 

[AmirMohammad]

I think 2-3dB defradation of sidelobe is due to fabrication. In my experience of an array of 16 horns with a 30dB SLL goal, I had 2 dB degradation due to feeding network and cables and 1 dB due to antenna itself mechanical errors that finally concluded to a 27dB SLL. Specially in slot which error factors including the angles of slots, amount of loss of waveguide, position of slots,... affects SLL.

 

[Bob60]

Something magic . Typically for complicated Hi gain antenna that is around -15 dB. But in your case should something simple, sectoral, equivalent to some dipole area.
Can you drop your project?

 

[farzanehjun]

I think 2-3dB defradation of sidelobe is due to fabrication. In my experience of an array of 16 horns with a 30dB SLL goal, I had 2 dB degradation due to feeding network and cables and 1 dB due to antenna itself mechanical errors that finally concluded to a 27dB SLL. Specially in slot which error factors including the angles of slots, amount of loss of waveguide, position of slots,... affects SLL.

Thanks for your reply
I know thatthe fabrication process is major problem, as you said.
But , you know, I can not improve fabrication and so I have to design Antenna with better SLL
Do you any idea about reduction SLL in simulation? for example less than -30 dB?

- - - Updated - - -

Something magic . Typically for complicated Hi gain antenna that is around -15 dB. But in your case should something simple, sectoral, equivalent to some dipole area.
Can you drop your project?

So sorry, I can't drop it.

 

[Bob60]

No problem.