Question Pool -- Category E9
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one of the ten category groups.
Select one of the following categories. You will be presented
questions at random. Return here when you are ready to try
another category.
- E9A
- Isotropic radiators: definition; used as a standard for
comparison; radiation pattern; basic antenna parameters: radiation
resistance and reactance (including wire dipole, folded dipole), gain,
beamwidth, efficiency
- E9B
- Free-space antenna patterns: E and H plane patterns (ie, azimuth
and elevation in free-space); gain as a function of pattern; antenna
design (computer modeling of antennas)
- E9C
- Phased vertical antennas; radiation patterns; beverage antennas;
rhombic antennas: resonant; nonresonant; radiation pattern; antenna
patterns: elevation above real ground, ground effects as related to
polarization, take-off angles as a function of height above ground
- E9D
- Space and satellite communications antennas: gain; beamwidth;
tracking; losses in real antennas and matching: resistivity losses,
losses in resonating elements (loading coils, matching networks, etc.
{ie, mobile, trap}); SWR bandwidth; efficiency
- E9E
- Matching antennas to feed lines; characteristics of open and
shorted feed lines: 1/8 wavelength; 1/4 wavelength; 3/8 wavelength;
1/2 wavelength; 1/4 wavelength matching transformers; feed lines: coax
versus open-wire; velocity factor; electrical length; transformation
characteristics of line terminated in impedance not equal to
characteristic impedance
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