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E9: Antennas and Transmission Lines
Subelement E9 is the largest and most comprehensive section of the Extra class exam, covering all aspects of antennas and the feed systems that connect them to transceivers.
You will study fundamental antenna parameters such as radiation resistance, efficiency, gain, and effective radiated power; antenna radiation patterns and computer modeling techniques; practical wire antenna designs including phased arrays, folded dipoles, and long-wire configurations; Yagi and parabolic antennas; impedance matching networks; transmission line characteristics; the Smith chart; and specialized receiving antennas for direction finding and low-band operation.
Key point: E9 spans eight groups: antenna fundamentals (E9A), radiation patterns (E9B), wire antennas (E9C), directional antennas and loading (E9D), impedance matching (E9E), transmission line characteristics (E9F), the Smith chart (E9G), and receiving and direction-finding antennas (E9H).
Study These Topics
E9A
Antenna Fundamentals: ERP, EIRP, Efficiency, Gain, Ground
Study E9A
E9B
Antenna Patterns, Beamwidth, and Modeling
Study E9B
E9C
Wire Antennas, Phased Arrays, Ground Effects
Study E9C
E9D
Yagis, Parabolic Reflectors, Loading, Antenna Q
Study E9D
E9E
Impedance Matching, Stubs, Power Dividers
Study E9E
E9F
Transmission Line Characteristics and Stubs
Study E9F
E9G
The Smith Chart
Study E9G
E9H
Receiving Antennas, RDF, Beverage, Loop Antennas
Study E9H
Next in this section:
E9A: Antenna Fundamentals →
E9A: Antenna Fundamentals →
Previous:
← E8: Signals and Emissions
← E8: Signals and Emissions
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