Standing Up For Standing Waves
Topic (Syllabus) from the Standing Up For Standing Waves video -
Website: http://home.windstream.net/whays101/index.html
RF Communications. Past, Present, and Future:
Milestones in RF Communications
One Hundred Years ago efficient Transmission Lines and Antennas equaled increased range
(Standing Up For Standing Waves Rule #1)
Rule #1 still applies in the 21st Century
Overview of Demonstration Equipment:
RF Source
Frequency
4 to 1 Coaxial Balun
Transmission Line
Sensors
Ideal Transmission Line Conditions:
Terminating Impedance Equals Transmission Line Impedance
Transmission Line RF Power Distribution
Transmission Line RF Voltage Distribution
Transmission Line RF Current Distribution
Standing Wave Ratio (SWR):
Technically known as Voltage Standing Wave Ratio or VSWR
Defined as a Wave that appears to be "Frozen in Time" or "Standing" on a Transmission Line
Caused by Collision of "Forward" and "Reflected" Energy Waves
Why does anybody care?
Characteristics of Transmission Lines with Standing Waves:
RF Voltage Distribution along a Transmission Line with Standing Waves
RF Current Distribution along a Transmission Line with Standing Waves
Forward and Reflected RF Power Distribution along a Transmission Line with Standing Waves
Measuring Standing Waves using RF Voltage
Measuring Standing Waves using RF Current
Measuring Standing Waves using RF Power
Visulization of a Standing Wave
Simple Resonant Dipole Antenna Characteristics:
"E" or Voltage Field Pattern
"H" or Current Field Pattern
Voltage and Current distribution along a Dipole Antenna
Directional Antenna Characteristics:
Directional Characteristics of a 3 Element Yagi Antenna
Effects of Cross-Polarization
Transmission Line Stubs:
Open Ended and Shorted 1/4 Wave Transmission Line Stubs
Open Ended and Shorted 1/2 Wave Transmission Line Stubs
Increasing Antenna Gain:
Addition of a "Reflector" Element to a Dipole Antenna
Addition of a "Director" Element to a Dipole Antenna
Non-Resonant Dipole Antenna:
Efficiency of "Reduced Length" or "Non-Resonate" Antennas
Improving "Non-Resonate" Antenna Efficiency
Conjugate Match Theorem:
Lumped Constant Line Matching using Capacitors
Lumped Constant Line Matching using Inductors
Distributed Constant Line Matching Using Open Ended Transmission Line Stub
Distributed Constant Line Matching Using Shorted Transmission Line Stub
Phase Velocity:
Measuring the Phase Velocity of a Transmission Line
Loss of Phase Velocity in different Dielectric Materials
Ferrite Beads:
Single Mode Attenuation
Common Mode Attenuation
Outer Coaxial Shield Attenuation
Series-Section Transmission Line Transformers:
1/2 Wave "Impedance Transparent" Transmission Line Sections
1/4 Wave "Impedance Inverting" Transmission Line Sections
Demonstration Review:
Open Group Questions
Revisit or variations of the above objectives
Handout: