+ Post New Thread
Results 1 to 4 of 4
  1. #1
    Newbie level 2
    Points: 357, Level: 4

    Join Date
    Jan 2011
    Posts
    2
    Helped
    0 / 0
    Points
    357
    Level
    4

    dimensions for bowtie antenna

    does anyone knows what formulas can be used to obtain the dimensions for bowtie antenna

    •   AltAdvertisment

        
       

  2. #2
    Advanced Member level 5
    Points: 10,891, Level: 25
    WimRFP's Avatar
    Join Date
    Apr 2010
    Location
    Netherlands
    Posts
    1,591
    Helped
    593 / 593
    Points
    10,891
    Level
    25

    Re: dimensions for bowtie antenna

    Did you do an Internet search?

    There is no formula for bowtie dimensions that fits all applications. When you take some examples found on the Internet, you can scale them to the desired frequency.

    The length depends on the taper angle and proximity of, for example, a ground plane (to get directivity).

    By changing the taper angle (and dipole length), you have some control over the input impedance at resonance.



    •   AltAdvertisment

        
       

  3. #3
    Junior Member level 1
    Points: 278, Level: 3

    Join Date
    Oct 2011
    Posts
    15
    Helped
    0 / 0
    Points
    278
    Level
    3

    Re: dimensions for bowtie antenna

    Quote Originally Posted by WimRFP View Post
    Did you do an Internet search?

    There is no formula for bowtie dimensions that fits all applications. When you take some examples found on the Internet, you can scale them to the desired frequency.

    The length depends on the taper angle and proximity of, for example, a ground plane (to get directivity).

    By changing the taper angle (and dipole length), you have some control over the input impedance at resonance.
    what about if i want to do the printed bow tie? how do i calculate the antenna? LxW of the antenna, not the bow tie.



    •   AltAdvertisment

        
       

  4. #4
    Advanced Member level 5
    Points: 10,891, Level: 25
    WimRFP's Avatar
    Join Date
    Apr 2010
    Location
    Netherlands
    Posts
    1,591
    Helped
    593 / 593
    Points
    10,891
    Level
    25

    Re: dimensions for bowtie antenna

    If you have a design that is based on air, and you put it on PCB, the size must reduce somewhat to compensate for the reduces propagation speed because of the dielectric properties of the PCB material.

    If the thickness of the dielectric is far below the size of the antenna (for example a 900 MHz bowtie on 1.5 mm FR4, you should think of a size reduction of some 5..10%. Of course there must be no ground plane on the other side of the PCB. You may know that vicinity of other materials (metal, plastic, ground plane of electronics adjacent to antenna) may require tweaking the size to get VSWR within accaptable level.


    1 members found this post helpful.

--[[ ]]--