Fill in the Blanks


1		An antenna tuner is a variable , one or more variable capacitors, or a combination of these components connected in various configurations.


2		A popular variation of the antenna is a transmatch circuit, which uses a coil and three capacitors to tune the antenna for optimal SWR.


3		Radio waves act very much as waves do.


4		is the bending of a wave due to the physical makeup of the medium through which the wave passes.


5		is the bending of waves around an object.


6		wave signals are radiated by the antenna into the upper atmosphere, where they are bent back to earth.


7		Repeaters are widely used to the communication range for mobile and handheld radio units.


8		The combination within the communication satellite is known as a transponder.


9		Fading is the variation in signal at the receiver caused by the characteristics of the signal path and changes in it.


10		A diversity system uses multiple transmitters, receivers, or antennas to mitigate the problems caused by signals.


11		An antenna acts as the between a transmitter or receiver and free space.


12		The of the electric field strength of a radiated wave to the magnetic field strength is the impedance of space.


13		An antenna can transmit and receive at the same time only if a device such as a(n) is used to keep the transmitter energy out of the receiver.


14		antennas have an extremely wide bandwidth and can maintain a constant impedance and gain over a 4:1 frequency range.


15		The entire collection of antenna radials is often referred to as a counterpoise.