Why folded dipole is used in Yagi Uda antenna?
The folded dipole is a standard approach to increasing the Yagi impedance. It is widely used on Yagi antennas including the television and broadcast FM antennas. The simple folded dipole provides an increase in impedance by a factor of four.
Are Yagi antennas any good?
Yagis are directional antennas. Their high gain gives these antennas relatively good range. They have the most gain for their physical size compared to antennas like log periodics. The antenna’s design filters out almost all signal noise coming from the opposite direction.
What is the frequency range of a Yagi Uda antenna?
The frequency range in which the Yagi-Uda antennas operate is around 30 MHz to 3GHz which belong to the VHF and UHF bands. A Yagi-Uda antenna was seen on top of almost every house during the past decades. The parasitic elements and the dipole together form this Yagi-Uda antenna.
Which is an exciter in a Yagi Uda array?
A typical Yagi-Uda antenna array uses folded dipole as an exciter, due to its high impedance. The Yagi-Uda is center-fed and the feed point coincides with the origin. In place of a folded dipole, you can also use a planar dipole as an exciter. yu = yagiUda creates a half-wavelength Yagi-Uda array antenna along the Z-axis.
How does a Yagi antenna differ from a dipole antenna?
Another factor to keep in mind is that although a standalone dipole element would also have a finite limited usable bandwidth, the Yagi antenna configuration consisting of multiple dipoles results in a further reduction in the bandwidth in comparison to a simple dipole.
How does the induction field of a Yagi antenna work?
As we stated above, in the case of a Yagi antenna, the induction field mutual coupling is an asset that makes the Yagi possible. When the driven dipole is energized with the RF power from the transmitter, it produces an induction field around it.