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

How to reduce/shift the resonant frequency of patch antenna array?

Status
Not open for further replies.
Q

qurratulayn

Newbie level 6
Joined
Jan 28, 2017
Messages
12
Helped
1
Reputation
2
Reaction score
1
Trophy points
3
Activity points
77
I have designed 2x2 and 2x4 circular patch antenna arrays operating at 2.4GHz. To further improve antenna performance(gain) i have introduced air gap layer between substrate and ground plane. But that has shifted the resonant frequency towards right (between 3GHz to 3.5GHz). How do i reduce or bring back the resonant frequency to 2.4GHz without changing Patch dimensions, effective permittivity or substrate height?
 

qurratulayn said:
How do i reduce or bring back the resonant frequency to 2.4GHz without changing Patch dimensions, effective permittivity or substrate height?
Click to expand...

You have forbidden us to use any of the knobs that could do what you want. What did your simulation say before you built the arrays?
 

here is the Consolidated Return Loss report for different air-gap heights (A)
2x2 - AirGap - Shift in S11.JPG
 

qurratulayn said:
To further improve antenna performance(gain) i have introduced air gap layer between substrate and ground plane. But that has shifted the resonant frequency towards right (between 3GHz to 3.5GHz).
Click to expand...

This is expected, because you have lowered the effective permittivity of the substrate (mixture of er=1 and PCB).
You need to compensate that by larger patch dimensions, or higher PCB permittivity.
 

volker@muehlhaus said:
This is expected, because you have lowered the effective permittivity of the substrate (mixture of er=1 and PCB).
You need to compensate that by larger patch dimensions, or higher PCB permittivity.
Click to expand...

Yes but once an antenna is fabricated Patch dimensions, permittivity, substrate height cannot be changed. So i need external controlling factor for tuning frequency of antenna. Looking for other options like slots, DGS, diode etc not sure which one would help.
 

Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top