Simplified Construction of Conical Log-Spiral Antenna

An improved design for a conical log-spiral antenna (see Figure 1) simplifies construction and improves alignment. The radiating-element substructure of such an antenna must be properly aligned with the signal-feed substructure to obtain the correct impedance match for efficient coupling of the signal into or out of the antenna. This design provides for mating parts, the faying surfaces of which enforce alignment initially during construction and maintain alignment subsequently during use.