What is a quarter wavelength antenna?
What is a quarter wavelength antenna?
The quarter wave vertical antenna is the simplest form of vertical antenna. It provides good performance combined with an omnidirectional radiation pattern and simplicity of construction. Vertical antennas includes: Types of vertical antenna Quarter wavelength vertical 5λ/8 vertical J pole.
Does a 1/4 wave antenna need a ground plane?
Does a 1/4 wave antenna need a ground plane? Answer: Yes. All 1/4 wave antennas work best if they are installed in the center of a metal ground plane with at least 1/4 wave length radius (1/2 wave length diameter: ~6 inches for 900Mhz and ~3 inches for 2.4Ghz); larger is better.
Does a 1/4 wave antenna have gain?
With a normal sloped roof shape and mid-car size ground, the 1/4 wave has -6.59dBi at 2 degrees TO. Maximum gain is 3.05dBi.
How long should a quarter wavelength CB antenna be?
Choosing the Optimal CB Antenna Length Yes, taller/longer is better for range of distance when it comes to an antenna and the optimal antenna length is 1/4 wavelength. That translates to 102 inches (8.5 feet), too tall to be practical for most mobile applications.
Does a half wave antenna need a ground plane?
The 1/2 wave antenna (also called a dipole antenna) is built of two 1/4 wave elements that interact with one another to launch the electro-magnetic wave. It does not require a ground plane to work efficiently.
Do 5/8 wave antennas need a ground plane?
The concept for the five eighths wavelength vertical antenna starts with the quarter wavelength antenna. The quarter wavelength vertical antenna works well when it is loaded against a ground or ground plane.
How do you measure the length of a quarter wave antenna?
The radiating element is a quarter wave (λ/4) and the radials are 12% longer….1/4 Wave Ground Plane Antenna Calculator.
| Quarter Wave Ground Plane Antenna Calculator | |
|---|---|
| Frequency | MHz |
| Velocity Factor (see text*) | vf |
| Give me the results in… | mm (MilliMetres) cm (Centimetres) m (Metres) in (Inches) ft (Feet) |
| A. Vertical Monopole Radiating Element (λ*0.25)*vf |
Does a 1/2 wave antenna need a ground plane?
Answer: No. The 1/2 wave antenna (also called a dipole antenna) is built of two 1/4 wave elements that interact with one another to launch the electro-magnetic wave. It does not require a ground plane to work efficiently.
Does a half-wave antenna need a ground plane?
What is quarter wave dipole?
Dipole Antennas Quarter-wavelength dipole The total length of this antenna is a quarter the wavelength corresponding to the frequency to be used. It uses the reflective ground plane that provides an image of the antenna to complete the dipole.
What is the best antenna for ham radio?
Wire dipole One of the simplest and most cost effective antennas for radio communication is the dipole. If mounted as high as possible it can perform very well.
How far can a 100 watt CB radio transmit?
about 50-60 miles with a 60 foot antenna. A mobile would be much less.