Broadband Antennas Based on the Double Moebius Strip

Abstract The family of new antenna designs based on the double Moebius strip principle is proposed in this article. Three possible options of the power supply port location had been reviewed in this respect: the cut external strip with the signal port located directly in the cut area is used; the continuous rings without discontinuities are applied, with the signal port located in the gap between the strips; the power supply port is located in the interstrip area, and there is a cut in one of the strips. The radio technical parameters of the antennas were researched by means of their modelling in Ansys HFSS packet. The strip width, its thickness, the interstrip gap, as well as the radius of the cylinder within which the antenna may be enabled, were used as mechanical parameters of the antennas based on the double Moebius strip. The best results were represented by the super-broadband antennas with the port located between two strips. In particular, 2-inch (50.8 mm) frequency independent antenna based on the singular continuous Moebius ring has a bandwidth of 38.648 GHz (from 11 to 49.648 GHz), and the frequency ratio (correlation of maximum operation frequency to the minimum one) exceeds 4.5. The application of the cut in the strip helped to improve the frequency response characteristics of such antenna, having increased its frequency ratio to the value of 5.548. In fact, the synthesized antennas occupy the intermediate niche between the double strip ring and the fractal antennas in terms of their characteristics. It makes it possible to use them in integrated communication, radio location, radio monitoring and navigation, both as independent structural units and as parts of wheeled gear structures of the crewless platforms.