What is the gain of half wave dipole antenna?
Neglecting electrical inefficiency, the antenna gain is equal to the directive gain, which is 1.5 (1.76 dBi) for a short dipole, increasing to 1.64 (2.15 dBi) for a half-wave dipole.
What is the formula for half wave dipole?
The dipole antenna is cut and bent for effective radiation. The length of the total wire, which is being used as a dipole, equals half of the wavelength (i.e., l = λ/2). Such an antenna is called as half-wave dipole antenna.
Why half wave dipole antenna is used?
Half-wave Antenna. The simplest resonance structure in antenna technology is the half-wave dipole antenna. It forms the basic element of almost all antenna shapes and is sometimes used as a reference antenna in addition to the isotropic omni-directional radiator.
What is Hertz dipole antenna?
Hertzian dipole. A dipole antenna, developed by Heinrich Rudolph Hertz around 1886, is an antenna that can be made by a simple wire, with a center-fed driven element for transmitting or receiving radio frequency energy.
How do you calculate the wavelength of an antenna?
The 492/f formula is for an ideal antenna in free space, the 468/f is an estimate for real antennas at a reasonable height over ground. This gives the length of a full wavelength in meters. This formula is correct if the conductor is infinitely thin and other objects are infinitely far away from the antenna.
What is the half wavelength?
Abstract. Half-wavelength AC transmission (HWACT) is an ultra-long-distance AC transmission technology, whose transmission distance is close to half-wavelength at the system power frequency. The steady-state characteristics of the half-wavelength transmission line is introduced.
Is a dipole a good antenna?
Dipoles rank among the easiest antennas to build, construct or erect for HF amateur radio bands. Commonly used on bands like 80 meters, 40 meters, 20 meters, 15 meters, and 10 meters, dipoles are very useful and can perform excellently well if erected at a high elevation.
Where is dipole antenna used?
Dipole antennas are used in many areas, both on their own and as part of more complicated antennas where they can form the main radiating element. They are used in many forms of radio system from two way radio communications links, to broadcasting broadcast reception, general radio reception and very many more areas.
How is the length of a half wave dipole antenna determined?
Calculations for the for the length of the half wave dipole antenna take into account elements such as the ratio of the thickness or diameter of the conductor to the length, dielectric constant of the medium around the radiating element and so forth. In some instances it is necessary to shorten the length of a half wave dipole antenna.
How to calculate the length of an antenna?
Our dipole calculator is a simple tool that allows you to compute the length of a simple antenna – it’ll also provide you with the value of the wavelength and the adjustment factor [k].
Which is the best version of a dipole antenna?
The half wave dipole is the most popular version of the dipole antenna or aerial. As the name implies, the half wave dipole is a half wavelength long. This is the shortest resonant length that can be used for a resonant dipole. It also has a very convenient radiation pattern.
How long is the ham band dipole antenna?
Approximate Lengths for Ham Band Dipole Antennas Band (MHz) Length (feet) Length (metres) 1.8 266 82.2 3.5 137 42.2 7.0 68.5 21.1