What is the relation between width and power of rect patch antenna?

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Discussion Overview

The discussion revolves around the relationship between the width of a rectangular patch antenna and its power characteristics, particularly in the context of a series fed rectangular patch antenna design aimed at controlling side lobe levels. Participants explore concepts related to antenna design, including terminology and specific design coefficients.

Discussion Character

  • Technical explanation
  • Debate/contested
  • Mathematical reasoning

Main Points Raised

  • One participant seeks to understand the relation between the width of a rectangular patch antenna and power control in a series array antenna.
  • Another participant questions the terminology used, asking for clarification on "series array antenna" and "power ratio."
  • A participant clarifies that they are designing a 6x1 series fed rectangular patch antenna and expresses concerns about achieving low side lobe levels, mentioning the use of a Dolph-Chebyshev array.
  • One participant asserts that antenna size and shape relate more to frequency and bandwidth rather than directly to power, suggesting that increasing input power is a simpler solution for achieving more power.
  • Another participant indicates that the Dolph-Chebyshev coefficients can be used to adjust the amplitude of each patch to reduce side lobes, emphasizing that this adjustment does not involve changing the patch size.
  • A later reply expresses a belief that adjusting the size of each patch could also reduce side lobes, indicating a differing perspective on the relationship between patch dimensions and side lobe levels.

Areas of Agreement / Disagreement

Participants express differing views on the relationship between patch width and power control, with some asserting that size adjustments are not the solution while others believe they could be effective. The discussion remains unresolved regarding the best approach to achieve the desired side lobe levels.

Contextual Notes

Participants mention specific design parameters such as frequency (26 GHz) and the use of software (Hfss11) for antenna design, but there are unresolved questions about the meaning and application of the Dolph-Chebyshev coefficients in this context.

everjordan
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Hi, all

I want to control the power ratio of my series array antenna.

I heard there is some relation between width of rectangular patch antenna and power
to control the power ratio.

I want to know..

Do you know some relation?
 
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What is a series array antenna?

What is a power ratio?

I have professional experience designing antennas but I am not familiar with this terminology.
 
Series array antenna means series fed antenna.
I mis choose the words.
I'm not good at english.

I'm designing 6x1 series fed rectangular patch antenna.
And I want to obtain low side lobe level.
But my design result is poor.
So, I use dolph-chebyshev array.
And, I obtain some coefficient.
But I don't know the meaning of these coefficient.
I think these coefficient are related to the power.
And, I heard the power is related to the width of patch antenna.
So, I use the word power ratio.
 
No, the size and shape are related to the frequency and bandwidth. There is an upper power limit for an any antenna but I'm sure you aren't there yet.

What's your frequency, bandwidth, directivity, polarization, and input power? If all you want is more power, just crank up the input power.
 
Thank you for reply my problem.
I am designing my antenna using Hfss11.
Im only focus on realized gain to inrease the sidelobe level at phi=90. and main beam is located between 0 and 5 degree.
Operating frequency is 26Ghz.
Ok. Anyway.. What is the meaning of dolph-chebyshev coefficient?
Until now, I think it is related width of patch antenna.
How I apply these coefficient to my antenna? I really don't know.
 
It means if you adjust the amplitude of each patch by the array coefficient it will reduce your side-lobes the way you want.

You don't do this by changing the size of the patch, you do it with a power divider/attenuator network feeding the patches.
 
Really?
I think if I adjust the size of each patch, it will reduce side lobes...
Okay.. Thank you!
 

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