A spurious effect, in a loop antenna, resulting from the capacitance of the loop to ground. antenna fe


Related Terms

NUTATING ANTENNA

An antenna system used in conical scan radar, in which a dipole or feed horn moves in a small circular orbit about the axis of a paraboloidal reflector without changing its polarization.

MULTISTATIC RADAR

Radar in which successive antenna lobes are sequentially engaged to provide a tracking capability without physical movement of the antenna.

MONOPULSE RADAR

Radar in which directional information is obtained with high precision by using a receiving antenna system having two or more partially overlapping lobes in the radiation patterns.

HORIZONTAL SCANNING

In radar scanning, rotating the antenna in azimuth around the horizon or in a sector. Also known as searching lighting.

HORN ANTENNA

An antenna consisting of a waveguide the cross-sectional area of which increases toward the open end. Often shortened to HORN.

ISOTROPIC GAIN OF AN ANTENNA

The gain of an antenna in a given direction when the reference antenna is an isotropic antenna isolated in space. Also called ABSOLUTE GAIN OF AN ANTENNA.

ISOTROPIC ANTENNA

A hypothetical antenna which radiates or receives equally well in all directions. Although such an antenna does not physically exist, it provides a convenient reference for expressing the directional properties of actual antennas. Also called UNIPOLE

LOBE

The portion of the overall radiation pattern of a directional antenna which is contained within a region bounded by adjacent minima. The main beam is the beam in the lobe containing the direction of maximum radiation (main lobe) lying within specified values of field strength relative to the maximum field strength.

ANTENNA

A structure or device used to collect or radiate electromagnetic waves

ANTENNA COUPLER

1. A radio-frequency transformer used to connect an antenna to a transmission line or to connect a transmission line to a radio receiver. 2. A radio-frequency transformer, link circuit, or tuned line used to transfer radio-frequency energy from the final plate-tank circuit of a transmitter to the transmitter to the transmission line feeding the antenna.

Related questions

MarineProHelp 2018 - 2021