CHAPTER 13Cubical Quads and Delta Loops
Two popular multielement types of antennas employ elements formed from wire loops having a total length of approximately one wavelength. The cubical quad employs square loops and the delta loop is built with triangular loops. Both antenna types are found in single-element and multielement varieties, and both are easily analyzed in terms of equivalent half-wave dipoles that make them up. The single-element version of each is a form of 1λ loop that was evaluated in Chap. 7.
The cubical quad was desgned in the mid-1940s at radio station HCJB in Quito, Ecuador. HCJB is a Protestant missionary shortwave radio station that delivers a booming signal worldwide from its high-altitude location. According ...