Harry_C
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Hello!
I try to simulate a microstrip patch antenna for GPS with cst, but I don't hit the right frequency.
I found some equations in books and a calculator in the internet, but none of the simulation results matches the calculation results.
This is the onlinecalculator
https://www.emtalk.com/mpacalc.php?...a=&L_units_list=Lmm&Wa=&W_units_list=Wmm&Rin=
The equations of the books for the length and width of the antenna are:
L=y/2-dL //y = wavelength of the gps-signal; dL = 0.625mm
W=(c/2f)*sqrt(2/(E+1)) //E = dielectric Constant
I used 1.4mm as the thickness of the material and 4.3 as its dielectric Constant.
The width of both calculations is 58.49mm. The length of the internetcalculator is 45.9mm (~y/4), from the book 93.9mm (~y/2).
When I do a simulation with these results there is a peak in the s-parameter at 1.57GHz but it is always between -3 and -6db. There are some other frequencies with up to -30db but they are higher than 3GHz.
Now I don't know if I did a mistake in the calculation or the simulation.
Are the results from the equations realistic?
Thank you!
I try to simulate a microstrip patch antenna for GPS with cst, but I don't hit the right frequency.
I found some equations in books and a calculator in the internet, but none of the simulation results matches the calculation results.
This is the onlinecalculator
https://www.emtalk.com/mpacalc.php?...a=&L_units_list=Lmm&Wa=&W_units_list=Wmm&Rin=
The equations of the books for the length and width of the antenna are:
L=y/2-dL //y = wavelength of the gps-signal; dL = 0.625mm
W=(c/2f)*sqrt(2/(E+1)) //E = dielectric Constant
I used 1.4mm as the thickness of the material and 4.3 as its dielectric Constant.
The width of both calculations is 58.49mm. The length of the internetcalculator is 45.9mm (~y/4), from the book 93.9mm (~y/2).
When I do a simulation with these results there is a peak in the s-parameter at 1.57GHz but it is always between -3 and -6db. There are some other frequencies with up to -30db but they are higher than 3GHz.
Now I don't know if I did a mistake in the calculation or the simulation.
Are the results from the equations realistic?
Thank you!