Exam 14: Antennas

The characteristic impedance of twin lead is(in ohms):

For frequencies below 2 MHz, which antenna is used?

An impedance matching device that spreads the transmission line as it approaches the antenna is called a:

A group of antennas or antenna elements arranged to provide the desired directional characteristics is called:

The antenna gain, given in decibel with respect to a dipole is expressed as:

A series inductance used to tone out the capacitive appearance of an antenna is called

Which of the following antennas matches well with the 300- Ohm input impedance terminals?

An antenna created by taking a quarter-wavelength section of open wire line and bending each conductor outward 90 degrees is called:

The half-wave dipole antenna has gain relative to an isotropic radiator of

Any non-driven element of an antenna array such as a Yagi is called a:

It is desired to build a dipole to receive a 49 MHz broadcast. The optimum length for the dipole antenna is:

Which of the following is a directional antenna?

The model of the dipole antenna used in the Electronics Workbench Multisim simulation used an inductance of 1 H and series capacitor of 2.5pF. The resonant frequency of this antenna model is approximately:

The adjustment of the single stub tuner in the Electronics Workbench Multisim simulation was accomplished by changing the effective length of the :

Antenna gain provided with respect to an isotropic radiator is expressed as:

Feeling the half-wave dipole (Hertz) antenna at the center results in an input impedance that is purely resistive and equal to:

A direction in space with minimal signal level is called a:

Which of the following is used to determine antenna bandwidth?