How much gain does a 1/4 wave antenna have?
A 1/4 wave antenna exibits about 1.2 dbi gain, while a halfwave exibits 2.14 dbi, or an increase of . 94 db.
How big should my ground plane be?
A ground plane should be as big as it needs to be. That is, it should be present at or near* every connector, every IC, every supply decoupling capacitor, and every signal track.
How much gain does a ground plane antenna have?
The gain of actual quarter wave antennas with typical ground planes is around 2-3 dBi.
What is a 1/4 wave antenna?
The size of a 1/4-wave antenna is approximately one-quarter of the wavelength of the desired frequency, and the 1/2-wave is one-half the wavelength. Therefore, a 1/2-wave receiver antenna would be about 3 feet (1 m) long, and a 1/4-wave antenna would be about 18 inches (45 cm).
What is quarter wave length?
Note that the input impedance is inversely proportional to the load impedance. For this reason, a transmission line of length λ/4 is sometimes referred to as a quarter-wave inverter or simply as a impedance inverter. Quarter-wave lines play a very important role in RF engineering.
How does a quarter wave ground plane antenna work?
The normal quarter wave ground plane antenna consists of a vertical radiator which is insulated and centered between 4 horizontal surrounding radials which extend out from the base of the antenna. Each radial is evenly spaced (90 degrees apart from each other) around the vertical element. Enter the desired frequency.
How many radials are needed for a quarter wave antenna?
This calculator can be used to design a Quarter Wave Ground Plane antenna, with radials. The radiating element is a quarter wave (λ/4) and the radials are 12% longer. There are usually four radials, three being a minimum, but you could use up to six.
What is the frequency of a ground plane antenna?
The ground plane antenna is designed for unbalanced feed cables, like a coaxial cable. The driven element is often 1/4 λ long and the frequency is often between 10 and 512 MHz. l is the symbol for length and is measured in meter (m). f is the frequency in megahertz (MHz). f v is the velocity factor.
How many radials do you need for an unbalanced antenna?
There are usually four radials, three being a minimum, but you could use up to six. This is a true unbalanced antenna, with a feed impedance of around 50Ω and therefore a great match to 50Ω unbalanced feedline. The velocity factor is set to 95% which should be fine for most people.