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Basics of Dual-Polarized Antennas
Sponsored by:
Table of Contents:
Definition and Overview
1. Copolar and Total Power Front-to-Back Measurement
2. Cross-Polar Discrimination
3. Polarization Purity
4. Microstrip Patch Antennas versus Dipole Antennas
5. Further Discussion of XPD
6. Orthogonality for Dipole and Microstrip Patch Antennas
7. Tracking of Antenna Beams
8. Summary
Self-Test
Glossary
PDF of this tutorial
Self-Test
1. To measure antenna patterns properly, the polarization of the source must match the polarization of the antenna being tested for the entire revolution of the antenna-under-test.
a. true
b. false
2. When examining backward radiation measurements (copolarized front-to-back measurements) for a slant-45 antenna, the source polarization must match at boresite and be cross-polarized behind the antenna
a. true
b. false
3. When examining backward radiation measurements for a slant-45 antenna, the front-to-back ratio can be obtained from a single antenna pattern measurement.
a. true
b. false
4. At the sector borders (near 60 degrees), the difference between the vertical and horizontal signal strengths for the dipole-based antenna is approximately ____ dB, which demonstrates that the dipole-b
a. 2
b. 4
c. 6
d. 8
5. At the sector borders, the beamwidth of the dipole-based antenna is the broadest for the ______ polarized source position.
a. slant-45
b. vertically
c. horizontally
d. slant-30
6. The XPD of perfect circularly polarized antennas is _______dB, while that of a good linearly polarized base station antenna for space or polarization diversity is better than 15 dB.
a. zero
b. one
c. two
d. four
7. Measuring antennas that are vertically and horizontally polarized is more involved than measuring slant-45 antennas.
a. true
b. false
8. Polarization quality ratio (PQR) is another name for cross-polar discrimination (XPD) at different azimuth positions and is an easier, more complete way to examine the polarization purity of an antenna
a. true
b. false
9. If the azimuth antenna patterns from the two receive diversity ports are _________, the dual-polarized antenna is said to have a tracking problem, given that the patterns do not overlay.
a. identical
b. incomplete
c. asymmetrical
d. abbreviated
10. The orthogonality is perfect at boresite and nearly again at 78 degrees for ________-based antennas.
a. dipole
b. microstrip patch
c. both
d. neither
11. If patterns are taken on slant-45 antennas with vertical and horizontal source positions, the patterns overlay one another reasonably well if the antenna polarization remains slant-45 over the entire
a. true
b. false
Glossary >>
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