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How does a dual band J-pole work?
The J-pole works by matching a low impedance (50 Ω) feed line to the high impedance at the end of a λ/2 vertical dipole. This is accomplished with a λ/4 matching stub shorted at one end and open at the other. The impedance repeats every λ/2, or every 360° around the Smith Chart.
Is a J-pole directional?
The J-POLE, its self , should be non-directional. What you may be seeing is random radiation from the coax below the antenna changing as you move things around.. Start studying how to build a Yagi if you want more distance.
How does a J-pole antenna work?
The J-pole antenna is an end-fed omnidirectional half-wave antenna that is matched to the feedline by a quarter wave parallel transmission line stub (Lecher line). A half-wave antenna fed at one end has a current node at its feedpoint, giving it a very high input impedance of 800 – 2000 ohms.
How does a dual band antenna work?
A dual-band antenna is an antenna that can send and receive radio frequency signals at two distinct frequencies. Depending on their configuration, these antennas are capable of using either of the two frequencies individually or at the same time.
How does a Slim Jim antenna work?
SLIM JIM ANTENNA PROJECT. The Slim Jim is a vertically polarized omnidirectional end-fed antenna having considerable “gain” and this is concentrated almost parallel to ground toward the horizon rather than skyward making it more efficient than a ground plane type antenna by about 50 percent better.
Is a Slim Jim antenna directional?
The Slim Jim is a vertically polarized omnidirectional end-fed antenna having considerable “gain” and this is concentrated almost parallel to ground toward the horizon rather than skyward making it more efficient than a ground plane type antenna by about 50 percent better. It can be built for almost any frequency!
Does J pole antenna need ground plane?
J-Pole antennas are half wave antennas by design. But instead of an RF ground, the antenna should have an electrical ground to protect it in case of a lightning strike. An electrical ground doesn’t enhance the RF radiation of the antenna, but it is an important safety feature on any installation.
Should AJ pole antenna be grounded?
What is the difference between dual-band and single band WiFi?
Single-band routers use a 2.4 GHz band and are limited in range and speed compared to dual-band routers, which use both the 2.4 GHz and 5 GHz band. Dual band is mainly a way of getting more bandwidth in your wireless network.