Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

grating lob condition not working

Status
Not open for further replies.

yefj

Advanced Member level 4
Joined
Sep 12, 2019
Messages
1,169
Helped
1
Reputation
2
Reaction score
3
Trophy points
38
Activity points
7,010
Hello i have build an antenna array shown bellow.our main beam is at 180 degrease
the frequency is 10Ghz.i have exiced then all the same amplitude with no phase.
lambda=30mm theta_0=0 d=48mm
48/30=1/(sin(theta)-sin(theta_0))
theta_0=0
theta=38.68
180+38.68=218
180-38.68=141
So i know that my grating lobes are rising because d/lambda>1 but grating lobe supposed to be in the same amplitude as the main lobe.
why they are smaller the the main lobe?
Thanks.

1671881253984.png


1671885491229.png

1671882145484.png

1671880793652.png
 

Grating lobes have the same amplitude as the main lobe when you are calculating the Array Factor. But when you are calculating the radiation pattern, the effect of element factor causes the pattern to have grating lobes with lower amplitude levels.
 
Status
Not open for further replies.

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top