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Alfred

Impedance Matching for dual-band microstrip patch antenna

52 posts in this topic

Hi everyone, need help here. I have designed a dual-band microstrip patch antenna for LTE and WiFi applications. The antenna operate at 2.6GHz for LTE and 5.0GHz for WiFi. I have started to design this dual-band antenna by designing the 5.0GHz WiFi antenna then introduce 2 inverted U slots to generate the resonant 2.6GHz. I cannot achieve impedance matching for the 2.6GHz LTE antenna. Please help and advice.

 

Thank you. 

2222.cst

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The return loss, bandwidth and gain do not satisfy the requirement. Please advice on how to match the impedance for 2.6GHz LTE antenna without affecting the initial 5.0GHz WiFi antenna. 

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,,welcome...

you are not included in 2.6GHz frequency, should be amended patch and line adjustment..

for providing impedance 50 ohms..!!!

screenshot_14.png

screenshot_13.png

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My approach is designing the microstrip patch length and width for 5.0GHz then introduce 2 inverted U slots to generate the resonant 2.6GHz LTE antenna. Is that correct?

Thank you. 

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5 minutes ago, Alfred said:

My approach is designing the microstrip patch length and width for 5.0GHz then introduce 2 inverted U slots to generate the resonant 2.6GHz LTE antenna. Is that correct?

Thank you. 

,,, I think it should be the other way ... !!!

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Meaning I should design the 2.6GHz LTE antenna first then introduce slots to generate resonant 5.0GHz WiFi??

 

Thank you. 

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All right. I will try it out your suggestion. Btw any reason for not designing the 5.0GHz WiFi first?

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Almost done. Left the 2.6GHz impedance not match. Need to eliminate the imaginary part. How? Please advice. Please feel free to edit the design for me.

Thank you. 

33333.cst

22222.PNG

222.PNG

22.PNG

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Need to make the imaginary -20.34 become 0 and the VSWR near to 1. How? TT

Thank you. 

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Ammend patch and feed length do not help. Please help me.

Thank you. 

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Alfred, it seems that the antenna is not properly designed, look..


 

33333_01.jpg

33333_02.jpg

33333_03.jpg

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I think it's better to try this ...

69.jpg

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Hi, there are some differences between your simulation and my simulation. Any reason? Attached with my result and simulation file. From my result, everything is okay except the imaginary part and gain of the 2.6GHz antenna.

10.PNG

9.PNG

8.PNG

7.PNG

6.PNG

5.PNG

4.PNG

3.PNG

1.PNG

33333.cst

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Alfred, you're right, I increased the size ...13,92mm at ..14.52mm(13,92+0,6)

 

,,,I think it must to modify the inset feedding of antenna for a good adaptation line at 50 ohm impedance

screenshot_70.jpg

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Any other ways to match the 2.6GHz impedance?

TT

Haiz

I have tried every single method that I know but still cannot match the impedance without affecting the 5.0GHz antenna.

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I'll try to do it the simulation cst....!!!

but anyway, you have to try in the future to work with literary parts(not numbers) in the  Parameter List of CST's

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2 hours ago, Alfred said:

Why it is so hard to match the impedance? Gave up.

,,, why, never say give up...!!!

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Can antenna operate at 2.3GHz for LTE besides 1.8GHz and 2.6GHz?

 

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Yes, it's possible..but with a VSWR <1.5.!!!

A good antenna must to have VSWR<1,2

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