Hello
Is there any one who can help me on how to calculate the dimensions of my antenna in terms of wavelength? for example i have 60mm*60mm*1.6mm dimensions how can i calculate them in terms of wavelength at a solution frequeny of 2.45GHz?
Dear Adamu,
You have to firstly calculate the free space wave length lambda0,
Lambda0= c/f, with c the speed of light in free space= 3x10^10 cm/sec,
with f= 2.45 Ghz, then lambd0= 3x10^10/2,5 x10^9= 12 cm,
so the given dimensions in units of wavelength are to divide the lengths in centimeters by the wavelength lambda0,
60/120, 60/120, 1,6/120 = 0.5 lambda0, 0.5 lambda0.,0.013 lambda0,
If the material has a dielectric constant epsolon r, then the lambdamedium= lambd0/ sqroot of epsilonr,
So the the above numbers will be multiplied by the aqroot of epsilonr to be, 0.5 epsilon r lambdam, 0.5 eosilonr lambdam.,0.013 epsilonr lambdam
Best wishes
Hello sir,
I calculated using the square root of epsilon r and it is given me 1.045 lambdam for the width and length then 0.027 for the height
Dear Adamu,
welcome again!
Is epsilonr approximately equals 4?. If yes then your calculations are okay.
Best wishes
Mr Abdelhalim what of if the antenna is an UWB antenna how can someone calculate the dimension in terms of wavelength at median frequency for example Using CST because in CST you only assign frequency like from 1 to 12GHz orfrom 2 to 1GHz?
Dear Adamu,
Sorry for late answer on your new question. In case of narrow band band antenna you can consider that the antenna is a narrow band pass filter with center frequency such type antennas are resonant antennas. Ultra wide band antenna as very wide band pass filter can can be assigned center frequency as geometrical mean between its upper and lower cut off frequency. It can not be built from single resonance antenna as the narrow bandwidth antennas. There is special constructions for the ultra wide band width antennas whose dimensions are related to the lower cutoff frequency and the upper cutoff frequency rather than the intermediate frequency as i defined it in the beginning of my post.For detailed information about an UWB vivaldi antenna please refer to the link:Article Enhancing Tumor Detection in IR-UWB Breast Cancer System
Best wishes
Mr Abdelhalim Zerky,
how to calculate antenna dimensions in terms of lembda is resonant frequency is dual band.
dear MR. Manish
you have to assign the center of frequency (Fc) by calculating the fractional bandwidth using this
equation :
FBW = (Fh-Fl)/Fc
Dr-Manish Varun Yadav
CALCULATE GUIDED WAVELENGTH FOR THE PARTICULAR FREQUENCY TO CONSIDER FRINGING EFFECT TAKING INTO CONSIDERATION THE EFFECTIVE DIELECTRIC CONSTANT RELATING c the speed of light in free space= 3x10^10 cm/sec,
Hi for all,
In attached you will find a video that explain briefly the method to calculate dimensions of any devices in function of wavelength.
https://youtu.be/zBGZOSwmlxg
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