21 September 2004 Design of the double-y balun for use in GPR applications
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The double-y balun, transitioning from a coplanar waveguide (CPW) to a coplanar strip (CPS), was originally designed for use with balanced mixers. In this paper, numerical analysis of the double-y balun is conducted using two commercial electromagnetic simulators, Momentum and HFSS. Using these numerical solvers, the effect of substrate thickness on the performance of the double-y balun is investigated. A dipole, along with the outer conductor of a coaxial feedline is modeled in NEC to illustrate the effects of an unbalanced feed on the antenna pattern of a dipole. To accurately measure the amplitude pattern of a dipole, an automated measurement system is constructed. Using this measurement system, amplitude patterns of a 3.3 GHz dipole are measured with and without the double-y balun and compared with patterns obtained via NEC.
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Jaikrishna B. Venkatesan, Jaikrishna B. Venkatesan, Waymond R. Scott, Waymond R. Scott, "Design of the double-y balun for use in GPR applications", Proc. SPIE 5415, Detection and Remediation Technologies for Mines and Minelike Targets IX, (21 September 2004); doi: 10.1117/12.542770; https://doi.org/10.1117/12.542770

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