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Author Topic: Has my Patch Antenna a interfering Sidelobe?
Y3G
Advanced
Posts: 23
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Post Has my Patch Antenna a interfering Sidelobe?
on: March 14, 2013, 02:31
Quote

Hi,
I have put patched Antennas on my Radar and received strange Range-Time Intensity charts. I wonder If i need to shield one/either of them due to the possibility of a sidelobe. Am I right?
Thanks for any hints guys
Image
Image

charvatg
Administrator
Posts: 115
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Post Re: Has my Patch Antenna a interfering Sidelobe?
on: March 16, 2013, 09:36
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For patch antennas, the layers stack as follows: patch, dielectric, ground plane. If you're missing the ground plane then yes, otherwise it could be a different issue. If you're missing the ground plane i would expect to see weak returns from behind and in front of the radar because patches would not be working well and the field of view would be both in front of and behind the antennas.

My guess is it could be something in the analog circuit, it usually is. Can you post your plots so we can have a look?

Greg

Leo
Beginner
Posts: 17
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Post Re: Has my Patch Antenna a interfering Sidelobe?
on: March 16, 2013, 22:00
Quote

Yeah it's best to post your measurement results so that others can try to figure out what went wrong.

Quote from Y3G on March 14, 2013, 02:31
Hi,
I have put patched Antennas on my Radar and received strange Range-Time Intensity charts. I wonder If i need to shield one/either of them due to the possibility of a sidelobe. Am I right?
Thanks for any hints guys

kovelan
Newbie
Posts: 2
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Post Re: Has my Patch Antenna a interfering Sidelobe?
on: November 28, 2013, 08:53
Quote

Another way might be to remove the receiver coax, attach a HP detector diode,
and use an oscope to look for bleed-over. (HP has SMA diodes good to > 10ghz.)

Once this is done, find a rectangle of sheet-metal that's at least as large as
the antennas mount between the antennas then check bleed-over. Some extermination
is needed - let us know results.

kovelan
Newbie
Posts: 2
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Post Re: Has my Patch Antenna a interfering Sidelobe?
on: November 28, 2013, 15:44
Quote

Should be some "experimentation" - hate auto spell correction....

charvatg
Administrator
Posts: 115
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Post Re: Has my Patch Antenna a interfering Sidelobe?
on: November 30, 2013, 08:36
Quote

Generally speaking with antennas this directive there is no need to shield one from the other if you're transmitting about 10mW, but if you do you can increase transmit power.

Hope this helps,
Greg

PS. very nice looking patch antennas and radar device!

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