Home : Antennas : Theory : Page 2
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  • Antennas for Limited Spaces - In this article you can find solutions to the problem of keeping your ham radio antennas hidden from the CCR Police
    [ Hits: 477 | Votes: 0 | Rating: 0.00 ]
  • Antennas for MF and LF - Long Waves, Short Antennas, designing antennas for MF and LF communications
    [ Hits: 2011 | Votes: 1 | Rating: 2.00 ]
  • Antennas: dirty little secrets I - Butternut article on calculating real efficiecy of commercial antennas
    [ Hits: 564 | Votes: 0 | Rating: 0.00 ]
  • Azimuth Radiation Patterns - Below VHF the change in the radiation characteristics of an antenna will change considerably from frequency to frequency, making antenna selection more complicated.
    [ Hits: 720 | Votes: 1 | Rating: 10.00 ]
  • Balun Theory  pop - The word balun means balanced-unbalanced: it's used to adapt a balanced device to an unbalanced one, read more basic thory on Ununs and Baluns
    [ Hits: 37399 | Votes: 30 | Rating: 6.64 ]
  • Basic Antenna Theory  pop - Basic antenna theory by sub-TV
    [ Hits: 20982 | Votes: 23 | Rating: 5.29 ]
  • Basics of antennas - The current, the voltage, the impedance, the bandwidth, the polarization, and how the earth influences the famous radiation pattern.
    [ Hits: 588 | Votes: 0 | Rating: 0.00 ]
  • Better Feedline Loss Measurements with Antenna Analyzers - Various publications through the years have shown how the SWR measured on a shorted (or open) feed line can be used to calculate feed line attenuation
    [ Hits: 1568 | Votes: 2 | Rating: 10.00 ]
  • Cebik.org - W4RNL historic web site - A free historic mirror site of L. B. Cebik's W4RNL web legacy.
    [ Hits: 2710 | Votes: 9 | Rating: 6.56 ]
  • Choosing an Antenna - Choosing the right antenna for you, by Lewis G. McCoy W1ICP
    [ Hits: 1840 | Votes: 0 | Rating: 0.00 ]
  • Choosing and Antenna - Beginner guide on choosing an antenna for your ham radio station by W5RH
    [ Hits: 448 | Votes: 0 | Rating: 0.00 ]
  • Choosing Wire Size for Toroidal Inductors - Measurements that show it doesn't make much difference
    [ Hits: 2177 | Votes: 21 | Rating: 6.34 ]
  • Coax Antennas - Amateur Radio Coaxial Antennas by G3TXQ
    [ Hits: 295 | Votes: 0 | Rating: 0.00 ]
  • Coax Cable Loss - Table representing loss of Coax Cables in db per 100ft.
    [ Hits: 2061 | Votes: 4 | Rating: 4.75 ]
  • Coax velocity factor - Coax Cables velocity factor article in pdf format
    [ Hits: 3922 | Votes: 14 | Rating: 4.86 ]
  • Coaxial antennas - G3TXQ study on coaxial cable demonstrate that it can reduce an element's length by something approaching the Velocity Factor of the cable
    [ Hits: 1147 | Votes: 1 | Rating: 10.00 ]
  • Coaxial cable dipole for 80m - Here are some simple antennas you can build along with calculators to help you get the right length.
    [ Hits: 2818 | Votes: 1 | Rating: 5.00 ]
  • Coaxial Transmitting Chokes - Understanding Common Mode and Differential Mode Currents on Transmission Lines by K9YC
    [ Hits: 896 | Votes: 0 | Rating: 0.00 ]
  • Common-Mode Noise - Receiving Common Mode Noise shows how lack of a balun can contribute to system noise
    [ Hits: 1843 | Votes: 3 | Rating: 9.67 ]
  • Conductors for HF Antennas - Putting up an antenna for the low bands? What kind of wire will you use? This analysis may change your plans.
    [ Hits: 1996 | Votes: 4 | Rating: 9.25 ]
  • Construction Principles for UHF VHF Yagis - The Construction Principles for Duoband-Yagis 2m/70cm by DK7ZB
    [ Hits: 1465 | Votes: 6 | Rating: 5.33 ]
  • 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: 1429 | 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: 536 | 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: 860 | 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: 344 | 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: 255 | 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: 4742 | Votes: 11 | Rating: 4.36 ]
  • Dipole Height  pop - How High should my Dipole be? Dipole Antennas and the effect of height above ground
    [ Hits: 19937 | 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: 562 | 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: 376 | Votes: 0 | Rating: 0.00 ]
  • Directional arrays - About collinear array antennas
    [ Hits: 4147 | 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: 21245 | 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: 381 | 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: 854 | 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: 129 | 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: 318 | Votes: 0 | Rating: 0.00 ]
  • Effects of VSWR on Transmitted Power - By James G. Lee, W6VAT
    [ Hits: 875 | 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: 302 | 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: 133 | 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: 388 | 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: 904 | Votes: 0 | Rating: 0.00 ]
  • EZNEC simulation files - EZNEC Simulation files collection by DF9CY
    [ Hits: 423 | Votes: 2 | Rating: 7.00 ]
  • FAQs - Basic Antenna Theory - Faqs and antenna basics
    [ Hits: 9689 | 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: 1656 | Votes: 1 | Rating: 1.00 ]
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