Antenna theory is one of those subjects that can become incomprehensible several equations before it becomes useful.
Antenna-Theory.com was built around the opposite approach: explain the engineering as simply as possible without making it false.
The site covers antenna basics, antenna types, arrays, measurements, Smith charts, impedance matching, design, careers and related electromagnetics. Its definitions section alone runs through terms such as axial ratio, baluns, cross polarization, EIRP, envelope correlation coefficient, multipath, mutual coupling, S-parameters, skin depth, total radiated power and VSWR.
Those are exactly the terms that make RF documentation hostile to newcomers when every definition assumes you already know the previous ten definitions.
The site’s principal human contributor, Peter Bevelacqua, describes himself as a practicing antenna engineer with a PhD in antennas and experience in defense, university work and consumer electronics, including Boeing, Apple and Google.
The about page credits most of the rest of the work to aliens.
This is acceptable technical-writing behavior.
Intuition before ceremonial mathematics
The site’s stated philosophy is that complexity is not a sign of intelligence.
That shows up throughout the material. VSWR, for example, is introduced not as a pile of transmission-line algebra but as a practical measure related to how much power is reflected from an antenna. More advanced mathematics still exists where it is needed, but the reader is first given something to understand.
That makes the site useful to more than students. Hobbyists, ham-radio operators, hardware designers and software people who suddenly find themselves debugging a wireless product all encounter the same vocabulary.
Antenna engineering also ages in an interesting way. The basic physics remains stable while applications multiply. The site’s historical introduction notes a path from a handful of experimental antennas in the 1890s to radio and television, then to mobile devices carrying several antennas at once for cellular, Wi-Fi, GPS and NFC.
The Web is full of technical pages that disappear when a product line changes or a company redesigns its documentation.
Independent reference sites can survive because the subject, not the release cycle, is the organizing principle.
That is why Antenna-Theory.com belongs in the Ancient Web corpus even though it is younger than many of CacheRat’s 1990s survivors. It follows the durable model: one domain, deep subject matter, stable terminology and an author trying to make difficult knowledge directly reachable.
Also aliens.