Helix antenna design and construction details

Input data (design requirements)

Design frequency	MHz
Number of turns
Turn spacing	wavelengths

The results

Legend. The letters in the image are used in the table below.

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Wavelength		mm
Ideal diameter (internal)	D=	mm
Gain		dBi
Conductor diameter	d=	mm
Winding step (between centers)	S=	mm
Separation of the adapter section	a=	mm
Total conductor length		mm
Minimum reflector diameter	R=	mm
Total antenna length	L=	mm

Design performance

Bandwidth (@ -1dB)	Fmax/Fmin:
	Fmax:	MHz
	Fmin:	MHz
Bandwidth (@ -3dB)	Fmax/Fmin:
	Fmax:	MHz
	Fmin:	MHz
Beam width (@ -3dB)		degrees