How is doing Interdigital capacitor?
I want to know, when I use capacitor in antenna, frequency operation should be shift to the lower frequency? Is it true?
Thanks
It depends where you use it. It can increase or decrease the resonant frequency, just as it can in a resonant circuit, depending whether you use it in series or parallel, and whether it is a series resonance or a parallel resonance.
The capacitor will change the resonance point of the receiver equivalent circuit ..if it is parallel or series. So the center frequency will diverse, I think it increases in case of parallel and vise versa.
Hi dear Malcolm White
Thanks
I want to use in antenna, and I think if the plates of this capacitor are not parallel with together and get close to together, resonance point can decrease
what is your opinion? Is it true?
Thanks
Hi dear Mona A. El Naggar
thanks
what happens, when capacitor plates get close to together?
You still haven't said if the capacitor is in series or in parallel. If it is in parallel than it will probably decrease the frequency as the capacitance gets bigger.
Capacitance increases as the gap between conductors decreases and also increases when the area where they are close together increases.
C=epsilon A/d ..so when d decreases naturally c increases hence the effect increases if the capacitor is connected in parallel and decreases vice versa
Hi, I recommend to study 2 papers addressed below:
1- A Compact Wideband Patch Antenna Loaded by Interdigital Capacitor with Equivalent Circuit Model. J. Microw. Optoelectron. Electromagn. Appl. 2017, vol.16, n.3, pp.675-685. ISSN 2179-1074. http://dx.doi.org/10.1590/2179-10742017v16i3897.
2- Y. Dong, and T. Itoh, “Miniaturized substrate integrated waveguide slot antennas based on negative order resonance,” IEEE Trans. Antennas propag., vol. 58, no. 12, pp. 3856-3864, 2010.
regards
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