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Antenna Briefs 7 - Radio Wave Reflections in Propagation and Antenna Design MegawattKS |  |
| | | | SP6MLK | 15.09.2023 07:55:02 | 
Grupa: Administrator 
Lokalizacja:: Kłodzko JO80IK06AO
Posty: 41744 #8115435
Od: 2013-10-18
| Antenna Briefs 7 - Radio Wave Reflections in Propagation and Antenna Design - Part 1
This episode covers reflection of radio waves and how it is important in both propagation, and in the design and construction of directional antennas. Part 1 overviews both, as well as introducing related effects including refraction, diffraction, absorption, and scattering. The main focus is at frequencies of VHF and above, including cellular, but a brief mention of HF propagation is also made. Part 2 will provide an overview of how EM fields are reflected (and/or absorbed) by materials including metal and wood, and show real-world measurements of reflection and absorption (attenuation) for some typical materials found in residential and commercial buildings.
TYLKO ZAREJESTROWANI I ZALOGOWANI UŻYTKOWNICY WIDZĄ LINKI » DARMOWA REJESTRACJA
_________________
73! Stanisław SP6MLK
Kłodzko JO80IK06AO
http://ra-ukf.iq24.pl/default.asp
http://www.ukf-te.iq24.pl/default.asp
http://spukfcontest.atthost24.pl/
| | | | | Electra | 02.12.2024 04:08:21 | 
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| | | | | SP6MLK | 15.09.2023 07:57:56 |
Grupa: Administrator
Lokalizacja:: Kłodzko JO80IK06AO
Posty: 41744 #8115436
Od: 2013-10-18
| Antenna Briefs 7 - Radio Wave Reflections in Propagation and Antenna Design Part 2
This is the second half of episode 7 which shows how reflections are important in radio / wireless wave propagation, and in the design and construction of antennas as well. Part 1 overviewed both, and touched on related effects including refraction, diffraction, absorption, and scattering. Part 2 (this video) provides some key theoretical background concepts showing how reflection occurs and then presents real-world measurements of reflection and absorption / attenuation caused by typical materials found in building construction. We also repeat Hertz's original experiment using modern TinySA instruments and a household mirror. In both videos, the focus is at frequencies of VHF and above, including cellular radio bands. However, much of the material is applicable at HF as well.
TYLKO ZAREJESTROWANI I ZALOGOWANI UŻYTKOWNICY WIDZĄ LINKI » DARMOWA REJESTRACJA
_________________
73! Stanisław SP6MLK
Kłodzko JO80IK06AO
http://ra-ukf.iq24.pl/default.asp
http://www.ukf-te.iq24.pl/default.asp
http://spukfcontest.atthost24.pl/
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