Microstrip patch antenna or Coplanar waveguide antennas resonant frequency can be tuned by by increasing and decreasing patch size.
I want to know the exact reason for it.
Seems like increasing patch size also increases capacitance and inductance which causes make it at lower frequency.
as resonance frequency, f can be calculated by 1 over 2pi*sqrtLC.
so, if LC value increases f value decreases.
Is it correct?
Since the resonant frequency are function of Lengnt, relative permitivity and the substrate height, so that by increase the patch length (increase inductance) leads to shift resonant frequency towards left side. Meanwhile decrease the patch length (decrease inductance) leads to shift resonant frequency towards right side.
S. S. Mahtab this is a pretty good YouTube video explaining radiating patch antennas.
https://youtu.be/4qyb_hslP3A
you can certainly think or it in terms of L and C but also remember what causes patches to radiate (fringing fields) and how the size in relation to wavelength affects this condition!
A microstrip patch antenna is a resonant transmission line antenna. It is resonant because the wave travels along it, reflects at the end then goes back to the beginning in a time which is one cycle of the microwave signal. The patch is one half wavelength long, except for small corrections due to the fields sticking out a bit at the ends. If the patch gets longer, the half wavelength for resonance gets longer, the wavelength gets longer and the frequency drops.
The velocity of light is a constant and of value c = 300,000,000 metres per second in free space, being reduced slightly in materials such as glass, because of a material characteristic called "refractive index".n, which for glass is about n =1.4 and for air is about n = 1.0008. The velocity of light in materials equals c/n. The wavelength of light, lambda, equals c divided by the frequency - c = Lambda*Frequency..
Electomagnetic radiation in general - from X- rays to radio waves the relationshios I have mentioned hold, wavelength, frequency velodity. Look them all up on the internet for further explanation.
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