A High-Power 160- and 80-Meter Transmitting Loop Antenna

摘要

My journey building a transmitting magnetic loop antenna began in late 2015 after I decided to have a 160-meter, DX-capable antenna that I could install within my suburban block. There were many challenges to overcome, including space and radio frequency interference from the neighbors. Considering these issues, the idea to revisit the concept of a transmitting magnetic loop antenna was born. I chose a magnetic loop primarily because it was physically small (able to fit into a 13-foot square footprint area of the backyard) and relatively immune to local E-field interference from within the near field. It can also radiate a reasonable amount of RF power between 20° and 45° elevation for DX operation, all while supporting near vertical incidence sky-wave radiation for short- to medium-distance communications.