What direction does a dipole radiate?
The radiation pattern of the half-wave dipole is maximum perpendicular to the conductor, falling to zero in the axial direction, thus implementing an omnidirectional antenna if installed vertically, or (more commonly) a weakly directional antenna if horizontal.
What is a dipole antenna used for?
The dipole antenna or dipole aerial is one of the most fundamental antenna elements being used for broadcasting, radio reception, two way radio communications, and much more. The dipole antenna or dipole aerial is one of the most important forms of RF antenna.
What is the impedance of a full wave dipole?
The values of the real and imaginary input impedance are well known for a dipole antenna. The impedance varies vs. frequency (wavelength compared to the antenna physical length). The half wavelength resonant frequency real part of the impedance should be 73 ohms, and the imaginary part should be 42.5 ohms.
What is the directivity of half wave dipole?
2.15dBi
The directivity of half wave dipole is 2.15dBi, which is reasonably good.
Are dipoles directional?
The radiation pattern of a dipole is similar the the shape of a ring doughnut. Therefore the dipole is omni directional only in its orientation i.e a vertical dipole is omnidirectional horizontally. Directly above and below the dipole the is virtually no radiation.
How does dipole work?
Dipole-dipole forces are attractive forces between the positive end of one polar molecule and the negative end of another polar molecule. Polar molecules have a partial negative end and a partial positive end. The partially positive end of a polar molecule is attracted to the partially negative end of another.
How do you find the impedance of a dipole?
Before examining the fields radiated by a dipole antenna, consider the input impedance of a dipole as a function of its length, plotted in Figure 2 below. Note that the input impedance is specified as Z=R + jX, where R is the resistance and X is the reactance.
What is the impedance of the folded dipole antenna?
The terminal impedance of a dipole antenna is 710 Ω.
How do you find the directivity of a half-wave dipole antenna?
Directivity = 1.64 or 2.15 dBi. Impedance for half-wave dipole antenna in free space is 73 Ω Half power beamwidth = 78°…Short dipole:
- Length of dipole < λ/10.
- Radiation resistance. = 20 ( π L λ ) 2.
- Directivity = 1.5 or 1.76 dB.
- λ = wavelength.
- L = length of dipole.
How do you find the directivity of a dipole antenna?
The directivity is calculated for Antenna 1 to be 1.273 (1.05 dB). The directivity is calculated for Antenna 2 to be 2.707 (4.32 dB)….
| Antenna Type | Typical Directivity | Typical Directivity (dB) |
|---|---|---|
| Short Dipole Antenna | 1.5 | 1.76 |
| Half-Wave Dipole Antenna | 1.64 | 2.15 |
| Patch (Microstrip) Antenna | 3.2-6.3 | 5-8 |
What is an electric dipole?
An electric dipole is tagged as a pair of objects which possess equal & opposite charges, parted by a significantly small distance. Let us take two charges having equal magnitude ‘Q’, which are separated by the distance ‘D’. Here we assume the first charge to be negative, while the second charge stays positive.
How do you calculate the electric potential of a dipole?
Therefore, the electric potential as a result of the dipole placed at any point P, when OP = r, is calculated as: V = (1/4πε) x pcosΘ / r 2
What is the dipole moment magnitude?
It is basically the exact measure of the strength associated with an electric dipole. Based on scientific and mathematical conclusions, the dipole moment magnitude is the product of either of the charges and the separation distance (d) between them.