Robert A. Durham
Life Fellow, IEEE; NM0D; Theway Labs, Bixby, OK 74008, USA
Publications
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Research Article
Triad: A Small-Footprint High Frequency Antenna System Design
Author(s): Marcus O. Durham*, Pruitt R. Durham and Robert A. Durham
The objective is to develop high-frequency (HF) antenna systems that are small, unobtrusive, usable in limited space, indoor or portable, not exposed to lightning, easily configurable, requiring only simple tools, minimum install, without climbing, and inexpensive. Construction, tests, and measurements clearly illustrate an HF antenna system can be greatly reduced in size to a couple of meters. Ten circuit design implementations condense HF antennas to a miniscule space, resulting in dramatically lessened environmental impact. A key consideration is changing every antenna element to a tunable inductor. Add inductor elements for wider bandwidth and multi-band. SWR, impedance, and frequency plots illustrate the fascinating performance. Most contemporary antennas are variations of the balanced dipole used by Hertz in 1888 or the unbalanced monopole advocated by Marcon.. Read More»