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.
The double-y balun, transitioning from an unbalanced coplanar waveguide (CPW) to a balanced coplanar strip (CPS), was originally developed for use with balanced mixers. In this paper, the
feasibility of this balun for feeding pulsed antennas was investigated via time-domain pattern measurements of a resistively loaded V-dipole. The need for a balun when feeding a symmetric antenna is illustrated via time-domain pattern measurements of the resistively loaded V-dipole with and without the double-y balun.
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