Скачать или смотреть Lecture #5 2/3: Waveguide horns, slow-wave structures

ANTENNAS AND PROPAGATION lecture 5:

12. Implementation of a waveguide horn, smooth transition to limit higher modes.
13. Examples of different waveguide horns: E, H, symmetrical 3:4, conical.
14. Phase erorrs of pyramidal/conical horns, spherical wavefronts.
15. Example: demanding Rayleigh distance for delta-phi below pi/8 for a sat-tv antenna.
16. Sensible requirementsfor delta-phi: pi/2 in E plane -1dB, 3pi/4 in H plane -1dB.
17. Square-phase error effects on radiation pattern, directivity and gain.
18. Comparison of pyramidal-horn radiation patterns in E and H planes.
19. Phase-error effects on the radiation patterns, shallow minima, broader beam.
20. Cutoff frequencies and fields of TE11 and TM01 modes in circular waveguide.
21. LC impedance matching in a simple circular-waveguide horn.
22. Student project: coffee can as an efficient WiFi antenna.