Home : Antennas : Theory : Page 3
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  • Cubical Quad Antenna - Let's explore the cubical quad antenna, or quad, and see what it really is and how it really works by w8ji
    [ Hits: 1431 | Votes: 3 | Rating: 1.33 ]
  • Currents in Standing-Wave Antennas - How can the current "flowing" out of the top of a mobile loading coil be greater than the current "flowing" into the bottom of the coil?
    [ Hits: 538 | Votes: 0 | Rating: 0.00 ]
  • Designing Driven Elements in Yagi antennas - The design and feeding of driven elements for VHF/UHF Yagi antennas , modeling, observations and some case studies by Graham Daubney F/G8MBI
    [ Hits: 865 | Votes: 2 | Rating: 6.00 ]
  • Designing Vertical Aerials - If you want to design vertical antennas you can find all theory and formulas used to model a vertical aerial calculating capacitance, reactance, building the inductor and calculating resistances. Includes an excel spreadsheet to calculate efficiency.
    [ Hits: 353 | Votes: 0 | Rating: 0.00 ]
  • Detuning a Tower from a vertical antenna - It is possible to detune the tower so that, at least on one band, the tower can be made to effectively disappear. That is, become non-resonant on the band of interest. This allows the vertically-polarized low-bands antenna to meet its potential.
    [ Hits: 257 | Votes: 0 | Rating: 0.00 ]
  • Dipole Antenna Radiation Patterns - Much confusion exists about the radiation patterns of antennas. In particular, the horizontal dipole is misunderstood by most who use it.
    [ Hits: 1673 | Votes: 5 | Rating: 4.40 ]
  • Dipole Calculation - Determining your proper length for the open half-wave dipole antenna
    [ Hits: 4743 | Votes: 11 | Rating: 4.36 ]
  • Dipole Height  pop - How High should my Dipole be? Dipole Antennas and the effect of height above ground
    [ Hits: 19952 | Votes: 24 | Rating: 5.55 ]
  • Dipoles and Vs at correct height - Dipoles at the correct height are not only stealthy antennas, they work great
    [ Hits: 566 | Votes: 2 | Rating: 8.00 ]
  • Dipoles versus Verticals - One of the classic arguments in amateur radio is whether a dipole or vertical is the best antenna
    [ Hits: 379 | Votes: 0 | Rating: 0.00 ]
  • Directional arrays - About collinear array antennas
    [ Hits: 4152 | Votes: 0 | Rating: 0.00 ]
  • Do You Need an Antenna Tuner  pop - Maybe yes, maybe no. It all depends on the type of antenna and feed line you're using. QST Article in pdf format
    [ Hits: 21275 | Votes: 10 | Rating: 5.30 ]
  • DXpedition Antennas for salt water locations - Which is better a 20m antenna for an island DXpedition: Yagi at 25', or a vertical or two on the beach?
    [ Hits: 384 | Votes: 0 | Rating: 0.00 ]
  • Easy way antenna systems - Written by John M. Haerle, WB5IIR (SK). A must read for anyone considering building a good low cost HF multi-band antenna system.
    [ Hits: 860 | Votes: 3 | Rating: 10.00 ]
  • Effect of size and height on flag RX Antennas - Analysis of flag receiving antennas using MININEC with focus on relation of size and atenna height by VE6WZ
    [ Hits: 133 | Votes: 0 | Rating: 0.00 ]
  • Effects of Very Large Ground Screens - A theoretical and experimental study of the effects of very large ground screens on 20 meter verticals
    [ Hits: 319 | Votes: 0 | Rating: 0.00 ]
  • Effects of VSWR on Transmitted Power - By James G. Lee, W6VAT
    [ Hits: 881 | Votes: 3 | Rating: 6.67 ]
  • Electrically Small Antennas 2016 - An antenna system is electrically small if it's enclosing sphere is <λ/2π. So a 10m band antenna of under 1.6m long qualifies.
    [ Hits: 306 | Votes: 0 | Rating: 0.00 ]
  • Elevation Angles - Importance of elevation angles on long distance communications, and relation of reception probability with the elevation angle of the transmitting antenna
    [ Hits: 138 | Votes: 0 | Rating: 0.00 ]
  • Errante's capacitive RF Grounding - This system demonstrates that no galvanic coupling to earth is needed for a proper RF earth grounding
    [ Hits: 391 | Votes: 1 | Rating: 10.00 ]
  • Exploring the secrets of the Smith chart - If you're a Radio Engineer wannabee, you need to understand transmission lines. It's impossible to really understand transmitters and antennas without understanding lines. Using the Smith chart is far easier than really understanding the math by Chris Scott and associates
    [ Hits: 905 | Votes: 0 | Rating: 0.00 ]
  • EZNEC simulation files - EZNEC Simulation files collection by DF9CY
    [ Hits: 425 | Votes: 2 | Rating: 7.00 ]
  • FAQs - Basic Antenna Theory - Faqs and antenna basics
    [ Hits: 9694 | Votes: 6 | Rating: 4.67 ]
  • Feeder Radiation - Connecting centre fed antennas, dipoles, yagis, rhombics, loops to coaxial cable, unless care is taken, it is not difficult to end up with feeder radiation resulting in power loss and the radiation characteristics changes
    [ Hits: 1658 | Votes: 1 | Rating: 1.00 ]
  • Fiber Glass Rods and Tubes - Properties of fiber glass rods and tubes
    [ Hits: 745 | Votes: 1 | Rating: 5.00 ]
  • Five eighths wavelength vertical antenna - The basics of a five eigths wavelength vertical antenna, a form of RF antenna widely used for mobile radio communications applications
    [ Hits: 334 | Votes: 0 | Rating: 0.00 ]
  • From Transmitter to Antenna - A collection of articles on the subject of impedance, impedance matching and high-frequency power transmission by G3YNH
    [ Hits: 1045 | Votes: 0 | Rating: 0.00 ]
  • G0KSC Revolutionary Yagi Antenna Feed System - New feed system for the Yagi directional beam antenna, that suppress unwanted side lobes within longer Yagi designs by G0KSC
    [ Hits: 1299 | Votes: 8 | Rating: 7.87 ]
  • G5RV Measurements - Measurements and characteristics of a G5RV Antenna, including effect of the transmission line as part of the antenna and contributes in a large way to it's multi band characteristics
    [ Hits: 5853 | Votes: 5 | Rating: 5.00 ]
  • Ground / Radial Systems - Guide to ground mounting antennas by Bencher
    [ Hits: 966 | Votes: 1 | Rating: 10.00 ]
  • Ground Loss and Vertical Antennas - How manage and quantify ground loss in vertically-polarized antennas by VE3VN
    [ Hits: 430 | Votes: 0 | Rating: 0.00 ]
  • Ground Problems - Collection of articles about ground systems
    [ Hits: 1147 | Votes: 2 | Rating: 8.50 ]
  • Ground systems for DXpeditions - An article bu N6LF on ground systems for multi-band verticals over saltwater
    [ Hits: 148 | Votes: 0 | Rating: 0.00 ]
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