There are abounding variations of antennas. Below are a few basal models. Added can be begin in Category:Radio abundance antenna types.
The isotropic radiator is a absolutely abstract antenna that radiates appropriately in all directions. It is advised to be a point in amplitude with no ambit and no mass. This antenna cannot physically exist, but is advantageous as a abstract archetypal for allegory with all added antennas. A lot of antennas' assets are abstinent with advertence to an isotropic radiator, and are rated in dBi (decibels with account to an isotropic radiator).
The dipole antenna is artlessly two affairs acicular in adverse admonition abiding either angular or vertically, with one end of anniversary wire affiliated to the radio and the added end blind chargeless in space. Since this is the simplest applied antenna, it is aswell acclimated as a advertence archetypal for added antennas; accretion with account to a dipole is labeled as dBd. Generally, the dipole is advised to be omnidirectional in the even erect to the arbor of the antenna, but it has abysmal nulls in the admonition of the axis. Variations of the dipole cover the bankrupt dipole, the bisected beachcomber antenna, the arena even antenna, the whip, and the J-pole.
The Yagi-Uda antenna is a directional aberration of the dipole with abject elements added which are functionality agnate to abacus a reflector and lenses (directors) to focus a fiber ablaze bulb.
The accidental wire antenna is artlessly a actual continued (at atomic one division wavelengthcitation needed) wire with one end affiliated to the radio and the added in chargeless space, abiding in any way a lot of acceptable for the amplitude available. Folding will abate capability and accomplish abstract assay acutely difficult. (The added breadth helps added than the folding about hurts.) Typically, a accidental wire antenna will aswell crave an antenna tuner, as it ability accept a accidental impedance that varies non-linearly with frequency.
The horn antenna is acclimated area top accretion is needed, the amicableness is abbreviate (microwave) and amplitude is not an issue. Horns can be attenuated bandage or advanced band, depending on their shape. A horn can be congenital for any frequency, but horns for lower frequencies are about impractical. Horns are aswell frequently acclimated as advertence antennas.
The emblematic antenna consists of an alive aspect at the focus of a emblematic reflector to reflect the after-effects into a even wave. Like the horn it is acclimated for top gain, bake applications, such as digital dishes.
The application antenna consists mainly of a aboveboard aqueduct army over a groundplane. Another archetype of a collapsed antenna is the cone-shaped aperture antenna (TSA), as the Vivaldi-antenna.
The isotropic radiator is a absolutely abstract antenna that radiates appropriately in all directions. It is advised to be a point in amplitude with no ambit and no mass. This antenna cannot physically exist, but is advantageous as a abstract archetypal for allegory with all added antennas. A lot of antennas' assets are abstinent with advertence to an isotropic radiator, and are rated in dBi (decibels with account to an isotropic radiator).
The dipole antenna is artlessly two affairs acicular in adverse admonition abiding either angular or vertically, with one end of anniversary wire affiliated to the radio and the added end blind chargeless in space. Since this is the simplest applied antenna, it is aswell acclimated as a advertence archetypal for added antennas; accretion with account to a dipole is labeled as dBd. Generally, the dipole is advised to be omnidirectional in the even erect to the arbor of the antenna, but it has abysmal nulls in the admonition of the axis. Variations of the dipole cover the bankrupt dipole, the bisected beachcomber antenna, the arena even antenna, the whip, and the J-pole.
The Yagi-Uda antenna is a directional aberration of the dipole with abject elements added which are functionality agnate to abacus a reflector and lenses (directors) to focus a fiber ablaze bulb.
The accidental wire antenna is artlessly a actual continued (at atomic one division wavelengthcitation needed) wire with one end affiliated to the radio and the added in chargeless space, abiding in any way a lot of acceptable for the amplitude available. Folding will abate capability and accomplish abstract assay acutely difficult. (The added breadth helps added than the folding about hurts.) Typically, a accidental wire antenna will aswell crave an antenna tuner, as it ability accept a accidental impedance that varies non-linearly with frequency.
The horn antenna is acclimated area top accretion is needed, the amicableness is abbreviate (microwave) and amplitude is not an issue. Horns can be attenuated bandage or advanced band, depending on their shape. A horn can be congenital for any frequency, but horns for lower frequencies are about impractical. Horns are aswell frequently acclimated as advertence antennas.
The emblematic antenna consists of an alive aspect at the focus of a emblematic reflector to reflect the after-effects into a even wave. Like the horn it is acclimated for top gain, bake applications, such as digital dishes.
The application antenna consists mainly of a aboveboard aqueduct army over a groundplane. Another archetype of a collapsed antenna is the cone-shaped aperture antenna (TSA), as the Vivaldi-antenna.
No comments:
Post a Comment