Antennas Flashcards
What happens if an electrical current travels through a conductor?
A magnetic field is created
An antenna radiates ______ energy.
Electromagnetic energy
What is the ideal length of antenna?
1/2 of the wavelength but halve waves are not practical. 1/4 is commonly used
When there is relative motion between a magnetic field and a conductor, ________.
A CURRENT flow will be INDUCED in the conductor.
Maximum Power transfer between a transceiver and an antenna will occur when?
The IMPEDANCE of the antenna system matches the impedance of the transceiver
Most aircraft antennas, and antenna coaxial cables have an impedance of _______.
50 Ohms
In order for a receiver to receive a radio signal, its antenna must be of the same _______ orientation as the transmitting antenna.
Polarization
Horizontally polarized antennas have their electric field ______ to the Earth’s surface.
Parallel
An antenna is vertically polarized when its electric field is ______ to the Earth’s surface
Perpendicular
Aircraft which do not have metal skin may require a special ________ to be manufactured and installed at the base of the antenna
Ground Plane Plate
Frequency is inversely proportional to ______.
Wavelength
Higher the frequency the _____ the antenna?
Shorter
