shmily0447
Advanced Member level 4
Hi,
I am now working on a 60 GHz scan beam linear patch array, consisting of 4 patch antennas and fed by a Butler Matrix.
Dielectric constant is 5.9, substrate thickness is 0.3 mm. It works pretty good at 57 GHz and 60 GHz, but when it comes to 64 GHz things are wieired:
When exciting in one port in Butler Matrix, the pattern direciton (15 degree) and sidelobe level is the same with other frequencies, which is fine. When exciting the other port, the pattern direction switched from 50 degree to 32 degree. But at other frequencies the pattern directions are all 50 degree.
Can anyone explain this to me? Or suggest ways to solve this?
Is it because of surface wave? Mutual coupling between patches? Edge effects? Or some other factors.
Thanks in advance.
I am now working on a 60 GHz scan beam linear patch array, consisting of 4 patch antennas and fed by a Butler Matrix.
Dielectric constant is 5.9, substrate thickness is 0.3 mm. It works pretty good at 57 GHz and 60 GHz, but when it comes to 64 GHz things are wieired:
When exciting in one port in Butler Matrix, the pattern direciton (15 degree) and sidelobe level is the same with other frequencies, which is fine. When exciting the other port, the pattern direction switched from 50 degree to 32 degree. But at other frequencies the pattern directions are all 50 degree.
Can anyone explain this to me? Or suggest ways to solve this?
Is it because of surface wave? Mutual coupling between patches? Edge effects? Or some other factors.
Thanks in advance.
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