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High power wideband helical antennas are currently being designed, simulated, and constructed at the University of Missouri-Columbia's Center for Physical and Power Electronics laboratory. The program CST Microwave Studio was used to simulate antenna designs derived from Krauss's formulas. Once simulations proved to be functional, the antennas were constructed, characterized, and compared against...
This study investigates a new design for the hemispherical heliacal antenna that provides significant improvement in bandwidth, while maintaining essentially the same directivity and half-power beamwidth of the basic hemispherical helical design. The proposed new design utilizes a wideband impedance matching technique and replaces the wire radiating element with a tapered metallic strip. This design...
Due to its approximately hemispherical radiation pattern, the quadrafilar helical antenna is commonly used in a wide variety of radio systems, especially in satellite communications. This paper is focused on appropriate design of this antenna in order to obtain the desired performance, like cardioid shaped radiation pattern and excellent circular polarization with a high axial ratio. Also, the antenna...
A compact circularly polarized (CP) vertical patch antenna is presented that employs a microstrip to slot-line transition for a wideband operation. The antenna is composed of two vertical patches, which are shaped as helix to obtain a broadband CP performance. The loop structure and the vertical overlap configuration lead to significant size reduction as much as 48% when compared to that of the printed...
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