Or it may be simpler to add just one wire at a time and connect it. If you don't get the results you expected, either edit the information entered for each wire or delete the wire and try again.
Thanks to Jerry KM3K for these and other suggestions. This is also known as the "right-hand rule". Engineering and amateur radiation patterns use an elevation angle instead in which 0 degrees represents the XY plane the horizon and increases toward 90 degrees at the zenith straight up. The inevitable confusion is regrettable but the two conventions are well-established.
It covers a lot of background and has many links to other tutorials and references. Excellent for the reader interested in knowing what other techniques and tools are available. This course might be appropriate once the material in Antenna Modeling for Beginners is understood. You will have to reduce the number of segments in the View Wires window, resulting in a less accurate simulation as noted in the book.
Nevertheless, these models can be viewed, edited, and used as a basis for simple designs and they are good practice for learning how antenna models are constructed. A collection of online math tutorials for various topics. Reactance and Impedance - a set of tutorials on ac circuits that explain what impedance is and why complex numbers are used to describe it.
The Hyperphysics web site also offers tutorials on impedance. Although it uses the same general method as NEC the method of moments , its formulation is different and it isn't a derivative of NEC. I've been through the code of both programs in great detail, and see no commonality in any part of the programs. NEC includes three types of ground model -- perfect, reflection coefficient, and Sommerfeld. MININEC has only the first two, but with the difference that the ground is assumed perfect during impedance and current calculation.
Although the reflection coefficient calculation is essentially the same in both programs, it's not at all unique or complicated. Page - This part of the exercise is only to show you the Antenna Notes window and not actually enter any new text. You can view the Antenna Notes window without saving any new text by clicking the No button. This will save the model with the new filename of TestDrive. If you do wish to enter some text, use the Save button.
If you click the Cancel button as instructed, the entire Save As operation will be ended without changing the filename. Page - The exercise instructs the reader to " Connect End 1 of the new Wire 2 to End 2 of the existing dipole wire by entering "W2E1" in the End 1 cell for Wire 2 and tabbing to the Y cell.
He can make but two cuts. He cuts off two pieces of wire to drive one against the other. How much gain can his antenna have? In answering this simple question, Steve leads us beyond dipoles into a world of 2D paths in 3D space. You will throw away your wire cutters after Steve shows how Texas longhorns and cowboy hats can beat beams.
Universal Equivalent Circuits for All Antennas rev 2 [8. This paper shows how to make universal equivalent circuits for any antenna over any bandwidth. Part 1 introduces the history of classical electric network synthesis and Smith charts and reviews antenna impedance and admittance properties.
Part 2 explains the modes of vibration of continuous structures, natural frequencies, feedpoint current, and impedance resonances. The impedance function of any antenna can be accurately modeled by two of four universal equivalent circuits given computed or measured impedance data and a circuit optimizer.
Examples of broadband universal equivalent circuits are shown for dipole, circular loop, and discone antennas over multi-octave and decade bandwidths. Broadband equivalent circuits are useful for interpolating between data points and performing lab tests without radiating. It is a great tool for modeling antennas, arrays of antennas, coupled transmit and receive antennas, and scattering problems.
Due to efficient software architecture and numerical algorithms, HOBBIES can handle very large and complex models on a desktop or laptop computer, for which other software programs would require a supercomputer.
Dipole Basics rev 1 [5. A proper understanding of dipole properties and characteristics is essential to understanding many other antennas including complementary antennas such as slots. Steve explains the physics of the much misunderstood dipole shortening factor K. And that resonance is a poor indicator of match.
Steve will indicate which dipole properties are better determined from graphs and equations, and which other properties are better determined by numerical computation, known as modeling. He reviews the shift from general physics to antenna engineering. Antenna modeling programs that are free or inexpensive are listed.
Various programs have different capabilities to handle geometric shapes and materials, or show results as graphs, 3D depictions, or animations of full-wave simulations.
Steve explains meshing by 1D segments, 2D surface patches, and 3D voxels. Many computed examples confirm and refute ideas about loading coil fields and resonances, wave propagation over irregular terrain, and antenna performance on spherical earth, as well as fields inside dielectric objects.
This presentation shows the power of modern computational electromagnetics to illuminate our understanding of electromagnetic phenomena and to analyze diverse problems in antenna engineering and Amateur Radio. Antenna Modeling for Radio Amateurs [8. Steve reviews the historical timeline of events that led to modern computational electromagnetics. Uploaded by Salam Doostam. Document Information click to expand document information Description: modeling. Did you find this document useful?
Is this content inappropriate? Report this Document. Description: modeling. Flag for inappropriate content. Download now. Related titles. Carousel Previous Carousel Next. Jump to Page. Search inside document. Anusha B Singh. Felipe Navarro. Sonthaya Phanthanyakij.
Julian De Marcos. Bladimir Salazar Acevedo. Ahsan Altaf. Julio Gabriel Aseron. Imran Wali. Edgar Gutierrez. Ayman Younis. Aaron Estacion. Narelle Love. Gilbert Hernandez. Popular in Radio.
0コメント