+ Post New Thread
Results 1 to 8 of 8

7th November 2018, 16:02 #1
 Join Date
 Jan 2017
 Posts
 20
 Helped
 0 / 0
 Points
 487
 Level
 4

Advertisment

7th November 2018, 16:22 #2
 Join Date
 Jun 2012
 Location
 Edmonton, Canada
 Posts
 1,021
 Helped
 295 / 295
 Points
 6,627
 Level
 19
Re: Mathematical formula of the minimum separations required between two patch antenn
Hi Suo,
This looks like the equation for the farfield distance of an antenna; in that case D is typically taken to be the diameter of the smallest possible sphere that encloses your antenna.

7th November 2018, 20:36 #3
 Join Date
 Jan 2017
 Posts
 20
 Helped
 0 / 0
 Points
 487
 Level
 4
Re: Mathematical formula of the minimum separations required between two patch antenn
so do you know the mathematical formula between the distance between element patch antennas and dimentions of antennas?

Advertisment

8th November 2018, 01:08 #4
 Join Date
 Apr 2011
 Location
 Minneapolis, Minnesota, USA
 Posts
 12,650
 Helped
 2517 / 2517
 Points
 51,537
 Level
 55
Re: Mathematical formula of the minimum separations required between two patch antenn
I have a weather forecast system (WeatherDirect) that receives information over the internet. The three units talk by rf communication. The instructions advise me not to place them close together.
In fact they state in the event one unit doesn't recognize the other, then I should increase their separation as much as several feet. I suppose multipath is the issue here. Perhaps it is most problematic when reflective objects are close to both transmitter and receiver.

8th November 2018, 19:06 #5
 Join Date
 Oct 2001
 Posts
 4,799
 Helped
 1419 / 1419
 Points
 33,583
 Level
 44

12th November 2018, 11:25 #6
 Join Date
 Jan 2017
 Posts
 20
 Helped
 0 / 0
 Points
 487
 Level
 4
Re: Mathematical formula of the minimum separations required between two patch antenn
Hello vfone,
what do you mean please?
you mean that when the length is bigger than the width of rectangular patch antenna, then D is the length and vice versa?
i need your answer please.

Advertisment

12th November 2018, 12:09 #7
 Join Date
 Oct 2001
 Posts
 4,799
 Helped
 1419 / 1419
 Points
 33,583
 Level
 44
Re: Mathematical formula of the minimum separations required between two patch antenn
Yes, exactly.
In patch antenna design generally the width W is larger than the length L, but there are applications (some array antennas) where is in the other way.

13th November 2018, 02:53 #8
 Join Date
 Oct 2017
 Posts
 126
 Helped
 15 / 15
 Points
 899
 Level
 6
Re: Mathematical formula of the minimum separations required between two patch antenn
What is "wavelength of lower cutoff frequency"? Cutoff frequency of array?
Does this imply the following:
For narrowband antennas lambda=1 D=0.5 and dmin=2*d^2/lambda=0.5
Then for wideband antennas separation must be bigger. as lambda is fraction of 1?
+ Post New Thread
Please login