Discone Design Using Simple N-coniiector Feed

As part of an indoor multipath measurement system, discone antennas featuring simple N-connector feed systems have been fabricated for the . . 1.0 to 2.0 GHz band. Experimentation reveals that excellent performance (VSWR < 1.5 :1 across the band) can be obtained with a simple "snap-on" feed/mount method, and that VSWR is most sensitive to the diameter of the disc feed conductor. Performance data from over 70 discone antennas having a. variety of flare angles, disc-to-cone spacings and feed conductor diameters are summarized here. Results show that for N-connector mounts, best flare angles range between 45° and 75°, and that the disc feed conductor should be 0.33 times the diameter of the cone top. The empirical data reveals that the antennas may be tuned for even better match by using a simple clamp nut tuning scheme. Design equ~tions, which differ from Nail1s because of the. large minimum . . . cone diameter1 are presented.