Wajahat Ali hello if you imagine your antenna to be placed on the Axis of a cylinder then any point on the surface of the cylinder can be expressed as e theta from the origin. It's one of the three coordinates :)
Sir one thing. In some books and also in class note I found Formula of HPBW as 52lamda to the power 3/2 whole divided by c root NS And in some materials the wavelength to the power 3by2 in denominator and the numerator is 52 only and apart from that your Formula was also found. So why there are so many variations? Which one is accurate? Please help
How this helical antenna is [become] a broadband antenna? As you explained, the circumference is limited by the lamda (circumference = between 0.75 lamda to 1.33 lamda, and alpha is between 12 degree to 14 degree)?
Axial mode helical antenna, shown here, are practical for VHF/UHF frequencies, because radius of the helix is about 1/(2Pi) of the wavelength. That would be over 15 meters for 3 MHz.
Thank you so much for sharing your knowledge Sir.It was very helpful
Very informative... thank u
I couldn't find your video on polarization. Could you please put a link to it in the notes for this video. Great videos Thanks
Real input impedance of broadband helical antenna? Have you EVER measured helical antenna over some range of frequencies?
Thank you so much.. Can you tell me what is Eθ ? Where do we use it?
Wajahat Ali hello if you imagine your antenna to be placed on the Axis of a cylinder then any point on the surface of the cylinder can be expressed as e theta from the origin. It's one of the three coordinates :)
Sir one thing. In some books and also in class note I found Formula of HPBW as 52lamda to the power 3/2 whole divided by c root NS
And in some materials the wavelength to the power 3by2 in denominator and the numerator is 52 only and apart from that your Formula was also found. So why there are so many variations? Which one is accurate? Please help
Yeah that seems to be the problem. I go with the ones in my ready recoker. However it might create problem in MCQs
How this helical antenna is [become] a broadband antenna? As you explained, the circumference is limited by the lamda (circumference = between 0.75 lamda to 1.33 lamda, and alpha is between 12 degree to 14 degree)?
limitation of lambda keeps the size practically feasible in the real world. As it breaks the barrier of single frequency reception hence broadband
What is lambda value? which value is good to make an antenna that has a range 3MHz - 30 MHz? What size of wire is good to use? Thank you
Axial mode helical antenna, shown here, are practical for VHF/UHF frequencies, because radius of the helix is about 1/(2Pi) of the wavelength. That would be over 15 meters for 3 MHz.
No mension about Normal mode operation and application.
How to make helix antenna main radiate side lobs +/- 120 degree(looking at polar plot)? I am struggling to achieve this kind of radiation.
Hello, I'm sorry, I do not have info on that :(
Sir please reply