Variations on loop and Adcock array topologies for improved radio direction finding performance

We present what we believe to be two novel and related antenna topologies that find application in radio direction finding (DF). A topology for a stabilised anti-phase dual-fed loop antenna is presented that reduces sensitivity to cross-polarised wave incidence, increases loop gain at higher frequencies and provides improved pattern stability when compared to traditional loop antenna designs. Additionally, we present a hybrid Adcock/loop topology that provides the desirable qualities of Adcock arrays at high frequencies whilst substantially improving the low frequency sensitivity of electrically small Adcock arrays. Design and measurements are presented for both variations.