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.

Register Log in

Please help! How to reduce the patch antenna beamwidth

Status
Not open for further replies.
B

bingjiang99

Advanced Member level 4
Full Member level 1
Joined
Apr 27, 2005
Messages
115
Helped
5
Reputation
10
Reaction score
0
Trophy points
1,296
Activity points
2,303
Dear all,

I am trying to design a patch antenna with <=70deg beamwidth. Right now, I can get about 80deg beamwidth. I know that I can use the larger ground, very thick substrate, or very thick superstrate to reach the goal. However, I can not do these things due to the size limitation. What else can I do to reduce the beamwidth?

Best regards,
 

Re: how to reduce the patch antenna beamwidth

any suggestions? Appreciate your help!
 

select lower relative permittivity,of course you will reduce the efficiency also.
 
yes, I am using the very low permitivity material with low loss tangent.


John_li said:
select lower relative permittivity,of course you will reduce the efficiency also.
Click to expand...
 

Using different Er for substrate will affect the Frequency Bandwidth and not the Radiation Beamwidth.
One way to change slightly the Radiation Beamwidth is to use fringing shape at the edge of the patch, or fringing-shape for the ground-plane if this one is small (if it has the same dimension as the active element).
 
What about PBG around the patch. That will make the radiation pattern narrower, since the surface mode is suppressed.
 
vfone,

Thank you very much for your suggestion. I can't make changes to the ground since it is possible that the antenna is put on the metal top.

By the way, I think that the smaller Er requires larger antenna, i.e., larger ground plane, therefore higher direcitivty.


vfone said:
Using different Er for substrate will affect the Frequency Bandwidth and not the Radiation Beamwidth.
One way to change slightly the Radiation Beamwidth is to use fringing shape at the edge of the patch, or fringing-shape for the ground-plane if this one is small (if it has the same dimension as the active element).
Click to expand...

Added after 2 minutes:

rfmw,

Thank you for your suggestion. Unfortunately I can't use PBG, I have a very limited dimension requirement. The whole antenna can't be much larger than the patch size.

rfmw said:
What about PBG around the patch. That will make the radiation pattern narrower, since the surface mode is suppressed.
Click to expand...
 

Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top