Theory

Basic antenna theory

Home : Antennas : Theory

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    • Antenna basics
      Basics by From Ian C. Purdie, VK2TIP
    • 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 basics
      An antenna study guide by NZART, cover basic topics like dipoles, wave lenght calculation, baluns, beams, dummy loads, and measurements.
    • 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
    • Basic Antenna Theory
      Basic antenna theory by sub-TV
    • Dipole Height
      How High should my Dipole be? Dipole Antennas and the effect of height above ground
    • 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
    • How to Construct a Dipole
      Basic and illustrated article on building wire dipole antennas. This page is about "how to build a dipole antenna"
    • Types of multiband antennas
      Types of multi-band antennas for the HF bands, from the horizontal end fed wire, to g5rv, log periodics, trap dipoles, vee beams and rhombic antennas.
    • FAQs - Basic Antenna Theory
      Faqs and antenna basics
    • 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
    • W1GHZ Microwave Antenna Book
      The W1GHZ Online Microwave Antenna Book online
    • 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?
    • 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
    • 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
    • Dipole Calculation
      Determining your proper length for the open half-wave dipole antenna
    • The Quarter Wave Sloper or the Inverted-V Dipole
      A question that seems to be asked nearly everyday is, which is best, the quarter wave sloper or the inverted-V dipole? PDF File by AD communications.
    • HF antenna for high rise dwellers
      If you have ever tried transmitting on HF from a tall block of apartments, where it's just not possible to erect a substantial aerial system, then this article is for you by Mel G4WYW
    • Marine corps antenna handbook
      U.S. Marine Corps in PDF format
    • 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.
    • To Trap or Not to Trap
      An interesting article on traps, pros and cons of trapping by W4RNL
    • 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.
    • Coax velocity factor
      Coax Cables velocity factor article in pdf format
    • 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.
    • 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.
    • Trap antennas, coaxial trap, coax dipole antenna loss resistance
      Testing and comparison of traps and trap antennas
    • Sloper Antenna Tests
      Mark Connelly - WA1ION tests on slooper antennas
    • Radiation and scattering
      Basic antenna theory, Antenna directivity and effective area, Antenna arrays
    • 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.
    • 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
    • Coaxial cable dipole for 80m
      Here are some simple antennas you can build along with calculators to help you get the right length.
    • 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
    • Antenna Fundamentals
      Adalet wireless document on antenna basics in a four pages pdf file
    • Link-Coupled Antenna Tuners
      W4RNL tutorial on on inductively coupled (link-coupled) antenna tuners
    Sponsor
    • 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
      [ Hits: 2944 | Votes: 5 | Rating: 9.20 ]
    • A Collection of Smith Chart Resources - The Smith Chart was originally created many years ago as an RF engineering aid by Phillip Smith of RCA.These pages includes extesnive documentation on smith carts.
      [ Hits: 1317 | Votes: 4 | Rating: 2.50 ]
    • 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
      [ Hits: 2662 | Votes: 2 | Rating: 6.00 ]
    • A NoTuner Antenna - SM5JAB anotenna made with a dummy load and a long wire.
      [ Hits: 502 | Votes: 1 | Rating: 10.00 ]
    • About broadband - What you gain and what you lose. While broadband and electrically small antennas may look attractive on the surface, they are by necessity compromises and usually donít work as well as tuned antennas.
      [ Hits: 547 | Votes: 0 | Rating: 0.00 ]
    • About directional antennas - Directional antennas a beginners explanation
      [ Hits: 230 | Votes: 0 | Rating: 0.00 ]
    • About horizontal yagi antennas - SM6EHY on horizontal yagi antenna
      [ Hits: 924 | Votes: 0 | Rating: 0.00 ]
    • About trap antennas - Negatives sides of using trap antennas
      [ Hits: 843 | Votes: 2 | Rating: 7.00 ]
    • 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.
      [ Hits: 3910 | Votes: 4 | Rating: 5.75 ]
    • Advanced active VLF Loop - Article on using loop antenna in very low frequencies
      [ Hits: 2154 | Votes: 3 | Rating: 7.00 ]
    • All About Antennas - A free five part series on antennas that covers many aspects of antennas, from radio wave propagation, to feed lines, type of antennas, connectors, adaptors and antenna switches by Bob Grove, publisher of Monitoring Times
      [ Hits: 645 | Votes: 3 | Rating: 7.50 ]
    • All HF Band Antennas - F6ITV consideration on HF Antennas, from trap wired anternnas, to center feed antennas.
      [ Hits: 1327 | Votes: 0 | Rating: 0.00 ]
    • Amateur Radio Antennas: Ground Theory - Perfect ground vs. poor ground. What is the difference? How does the ground influence the DX-gain?
      [ Hits: 6234 | Votes: 0 | Rating: 0.00 ]
    • 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.
      [ Hits: 3692 | Votes: 0 | Rating: 0.00 ]
    • Antenna & Ground Help - Radials & Counterpoise
      [ Hits: 573 | Votes: 0 | Rating: 0.00 ]
    • Antenna & Mounts - Mobile antennas, how to install antennas in the roof of a vehicle and how tune antennas.
      [ Hits: 5532 | Votes: 7 | Rating: 8.57 ]
    • Antenna basics  pop - Basics by From Ian C. Purdie, VK2TIP
      [ Hits: 39249 | Votes: 36 | Rating: 5.05 ]
    • Antenna Cable Loss and SWR - Calculate Cable Loss from SWR and reverse. Text file with only two simply formulas
      [ Hits: 2011 | Votes: 4 | Rating: 4.00 ]
    • Antenna Diversity - Single antenna with multiple polarization for diversity, diveristy receivers and propagation effects on signal polarization
      [ Hits: 282 | Votes: 0 | Rating: 0.00 ]
    • Antenna Efficiency - K0BG article con antenna efficiency covering topics like radiation resistance, coil losses and ground losses, other kind of losses. How calculate efficiency and Bandwidth Notes
      [ Hits: 343 | Votes: 0 | Rating: 0.00 ]
    • Antenna Fundamentals - Adalet wireless document on antenna basics in a four pages pdf file
      [ Hits: 2522 | Votes: 1 | Rating: 3.00 ]
    • Antenna Glossary - From Radiall-Larsen Antenna Technologies website technical reference documents
      [ Hits: 927 | Votes: 3 | Rating: 6.00 ]
    • Antenna Height Theory - Antenna mounting height, the higher the better? Learn how radiation pattern change, and decide if you need an higher or a lower angle for your dx needs.
      [ Hits: 1558 | Votes: 4 | Rating: 7.00 ]
    • Antenna Measurement Theory - Introduction to Antenna Measurement by orbit /fr pdf file
      [ Hits: 1652 | Votes: 0 | Rating: 0.00 ]
    • Antenna Measurements - The electrical characteristics of an antenna that are of interest to obtain by direct measurement are the frequency at which the antenna is tuned, the gain and radiation pattern
      [ Hits: 731 | Votes: 3 | Rating: 4.00 ]
    • Antenna Modeling Files - A collections of antenna models submitted to arrl and can be used with NEC-4 or Yagi Optimizer modeling programs
      [ Hits: 2389 | Votes: 5 | Rating: 5.80 ]
    • Antenna Modelling - Antenna modelling notes, including wich antenna modelling software choose and where to find useful resources for antenna planning and home-brewing.
      [ Hits: 2174 | Votes: 0 | Rating: 0.00 ]
    • Antenna Myths - It is best not to know very much, than to know a lot of things which aren not true.
      [ Hits: 404 | Votes: 2 | Rating: 4.00 ]
    • Antenna myths and mysteries - A practical approach to HF and VHF antennas, plus antenna myths and mysteries. By Terry Graves, K7FE
      [ Hits: 636 | Votes: 4 | Rating: 9.25 ]
    • 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.
      [ Hits: 7503 | Votes: 5 | Rating: 4.00 ]
    • Antenna Polarization notes - Antenna polarization is a very important consideration when choosing and installing an antenna. Most communications systems use either vertical, horizontal or circular polarization. Knowing the difference between polarizations and how to maximize their benefit is very important to the antenna user.
      [ Hits: 2239 | Votes: 4 | Rating: 3.50 ]
    • Antenna resonance and bandwidth - About antenna or aerial resonance and bandwidth and the impact of RF antenna resonance and bandwidth on radio communications systems.
      [ Hits: 293 | Votes: 0 | Rating: 0.00 ]
    • Antenna Selection Made Easy - This page will help you answer important questions about antenna selection before you talk to a supplier. After reading this paper, you should be able to better determine the most important parameters you need to know for your antenna selection criteria.
      [ Hits: 1880 | Votes: 2 | Rating: 3.00 ]
    • Antenna Theory - A discussion of antenna theory by Paul Graham, K9ERG , one of the better antenna explainations out there
      [ Hits: 2011 | Votes: 9 | Rating: 8.00 ]
    • Antenna Theory - Introduction to Electromagnetics, Maxwell's Equations, Transmission Line, Models, scale modeling, constants
      [ Hits: 968 | Votes: 3 | Rating: 7.33 ]
    • Antenna tips for the beginner - Some rules of thumb for beginners, with a QRP approach, by James R. Duffey KK6MC/5
      [ Hits: 1470 | Votes: 2 | Rating: 10.00 ]
    • 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.
      [ Hits: 3137 | Votes: 5 | Rating: 6.40 ]
    • Antenna-Theory.com - A source of knowledge for learning about and understanding antennas. The goal is to present a comprehensive tutorial on antennas.
      [ Hits: 585 | Votes: 3 | Rating: 6.67 ]
    • Antennas 101 - Dipoles, Doublets and Verticals by Rob May NV5E
      [ Hits: 588 | Votes: 1 | Rating: 8.00 ]
    • 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
      [ Hits: 9036 | Votes: 11 | Rating: 3.27 ]
    • Antennas and Grounds for apartments  pop - Suggestions on finding RF ground when you live in an apartment and you want to setup an antenna
      [ Hits: 21395 | Votes: 9 | Rating: 4.44 ]
    • Antennas and transmission lines - A very exaustive article on antennas and transmission lines. Covers many aspects of antennas and feed lines, in spanish
      [ Hits: 490 | Votes: 1 | Rating: 2.00 ]
    • Antennas and Transmission Lines Myths - Antennas, Transmission Lines, Tuners - Myths, Mysteries and Qualifiers By Don Wilhelm W3FPR
      [ Hits: 390 | Votes: 2 | Rating: 10.00 ]
    • Antennas basics  pop - An antenna study guide by NZART, cover basic topics like dipoles, wave lenght calculation, baluns, beams, dummy loads, and measurements.
      [ Hits: 23914 | Votes: 14 | Rating: 8.21 ]
    • Antennas for 100 Pound DXpeditions - NE1RD interesting publication published online about homebrewing antennas for dx peditions or portable use
      [ Hits: 2103 | Votes: 2 | Rating: 6.50 ]

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