Theory

Basic antenna theory

Subcategories:

  • Antenna Gain (27)
  • Impedance matching (29)
  • Wind Load (4)
    • Trending Links
    • Antenna basics
      Basics by From Ian C. Purdie, VK2TIP
    • Home-made antennas by we6w
      Various types of antennas by we6w
    • Balun Theory
      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
    • J-Pole theory
      The J-Pole antenna is an omnidirectional antenna that can be used for base, mobile and field day stations. It does not need a ground plane, radials or a complicated matching system. The J-Pole can be cheaply, simply and quickly constructed using a variety of techniques, some of which are discussed in this article.
    • Antennas and Grounds for apartments
      Suggestions on finding RF ground when you live in an apartment and you want to setup an antenna
    • Do You Need an Antenna Tuner
      Maybe yes, maybe no. It all depends on the type of antenna and feed line you're using. QST Article in pdf format
    • Dipole Height
      How High should my Dipole be? Dipole Antennas and the effect of height above ground. The effectiveness of a dipole antenna is influenced by its height above ground, determined by the intended use such as DX work, local communication, directionality, omni-directionality, and feed point impedance. Through EZNEC modeling, the study evaluates a 40-meter dipole's performance at various heights, from 7 to 560 feet. Findings reveal that lower heights enhance omni-directional local communication, while higher placements favor DX work with low-angle radiation. The study emphasizes the importance of defining operational goals to optimize dipole height and performance.
    • Why an Antenna Radiates
      How antenna works by ARRL
    • Grounding system
      Perhaps one of the most over looked aspects of setting up a listening post is a ground system
    • Antennas Tech reference by K1TTT
      Yagi Antennas, Antenna Materials and more.
    • How to Construct a Dipole
      Basic and illustrated article on building wire dipole antennas. This page is about "how to build a dipole antenna"
    • Antenna Basics
      Article designed to answer basic questions about antennas
    • The Antenna Elmer
      Here you will find information about wire antennas as well as directional beams.
    • W1GHZ Microwave Antenna Book
      The W1GHZ Online Microwave Antenna Book online
    • Antennas : theory and designs
      Thierry LOMBRY, ON4SKY, develops in several long articles all you need to know about antennas, their design and performance, for both amateurs and SWL
    • Understanding Standing Wave Ratios SWR
      We worry a lot about Standing Wave Ratio (SWR) in amateur radio since SWR is one indication of how well our antenna system is working. Most HF transceivers and antenna tuners have built in SWR meters. SWR is a measure of a transceiver' s output power verses the portion of that power reflected by the antenna system
    • Antenna Noise and Signal Cancelling at LF
      By using the signals from two antennas, controlling their relative amplitudes and controlling the phase of one of them, unwanted signal or unwanted noise can be phased out. Circuitry is described which uses the signal from a wire antenna to provide selective cancelling against the signal output from an LF loop antenna.
    • Low Noise Antenna Connection
      Reducing noise to your antenna can gain your aerial performance, learn how.
    • Rainbow Antenna Analyzer
      A small and inexpensive measurement device designed to determine antenna performance across the amateur bands through use of automatically collected SWR readings
    • Amateur Radio Antennas: Ground Theory
      Perfect ground vs. poor ground. What is the difference? How does the ground influence the DX-gain?
    • Antenna & Mounts
      Mobile antennas, how to install antennas in the roof of a vehicle and how tune antennas.
    • Using Delta Matching on HF Beams
      Using delta match with HF antennas design
    • Marine corps antenna handbook
      U.S. Marine Corps in PDF format
    • Hybrid Antennas
      Antennas that use a combination of vertical and horizontal polarisation.
    • G3SEK's Amateur Radio Technical Notebook
      A lot of good informations concerning antennas, filters, moonbounce, and circuitry data.
    • Directional arrays
      About collinear array antennas
    • Loading inductors in mobile antennas
      Mobile antennas, loading coil current, and loaded antennas. efficiency and electrical rules. Loading inductors used in mobile HF antennas.
    • Actual Antenna SWR
      Easy for calculate formula which could be a wake-up call for you. The SWR value at the input of antenna cable is not a actual SWR of your favorite antenna.
    • To Trap or Not to Trap
      An interesting article on traps, pros and cons of trapping by W4RNL
    • Another way to look at vertical antennas
      What iss the difference between a dipole and a vertical? Maybe not as much as you think. Come along and try another point of view.
    • The DK7ZB-Match for Yagis
      Simple, easy to built match developed in 1995 for Yagis with resistitive loads of 12.5, 18 and 28 Ohm.
    • Antenna Transmatch Tips
      Tips on tuning antennas using Antenna Tuning Units also called ATU. This article explains the functions and ills of tuners, along with some guide- lines for building an ATU.
    • 50MHz Power Splitters
      Splitting an antenna between two receivers or in use as the phasing harness in stacked antennas where there is a need to equally split the power from the transmitter between two antennas
    • K-FACTOR Table & Chart
      Determine the K-Factor used as a multiplier when constructing half-wave antennas.
    • Vertical plane antennas' beaming comparision
      Animated quad and yagi comparison. You can see antennas' characteristics behavior in a vertical plane with changing of the height.
    • HF Aerial Design
      A novel approach to aerial evaluation with diagrams and graphs by G3CWI
    • Antenna Fundamentals
      Adalet wireless document on antenna basics in a four pages pdf file
    • Trap antennas, coaxial trap, coax dipole antenna loss resistance
      Testing and comparison of traps and trap antennas
    • Low reactance multiband center feed wires
      An antenna system is more easily interfaced to a radio when the input reactance at the feedline terminals is low or close to series resonance
    • NVIS Propagation concept
      Army Field Manual 24-18 Appendix M with Graphics
    • A Modern Thermocouple Ammeter
      Thermocouple ammeters are very rare these days, but the job they were perfect for - measuring antenna currents - is still a modern requirement especially in respect to groundplane currents. By David A. Reid PA3HBB G0BZF
    • Link-Coupled Antenna Tuners
      W4RNL tutorial on on inductively coupled (link-coupled) antenna tuners
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  • Electronics
  • Grounding
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  • Traps
  • Radio Noise
  • Coils