J-pole Antenna Design Pdf

The specific location where the coaxial cable connects to match the 50-ohm impedance. Calculations and Dimensions

Once tuned, drill permanent holes for stainless steel screws or solder the connections in place. Advantages and Use Cases j-pole antenna design pdf

Frequency: 144 MHz Radiator Length: 0.25 × 2.07 m = 0.52 m Reflector Length: 0.25 × 2.07 m = 0.52 m Element Diameter: 1.5 mm Spacing: 10 mm The specific location where the coaxial cable connects

The J-pole is essentially a half-wave omnidirectional antenna fed by a quarter-wave matching stub. It gets its name from its characteristic "J" shape. Key Components It gets its name from its characteristic "J" shape

To design a J-Pole for a specific frequency ($f$ in MHz), you must calculate the length of the Radiator and the Matching Section. Since the velocity factor of bare copper wire is approximately 95% ($0.95$), the formulas are as follows:

The J-pole antenna was first introduced in the 1940s by a Japanese engineer, who designed it as a simple and compact antenna for use in amateur radio applications. The antenna quickly gained popularity among radio enthusiasts due to its ease of construction and relatively good performance. Over the years, the J-pole antenna has undergone several modifications and improvements, leading to the development of various design variants.

where Lr is the radiator length and λ is the wavelength.