## A Wideband, Four to One Impedance Transforming Balun Using Planar Transmission Lines |

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### Contents

2 INTRODUCTION TO BALUNS | 2 |

3 THE PROPOSED BALUN | 18 |

4 Analysis of Coupled Lines Above a MultiLayered Substrate | 23 |

3 other sections not shown

### Common terms and phrases

180 degrees air dielectric air layer amplitude difference balun cavity balun configurations balun junction balun of Fig balun performance bandwidth boundary conditions capacitance center conductor center frequency center strip circuit of Fig coaxial balun compensating stub component considered cosh dielectric constant electrical length equal phase velocities equation fn(y Fredholm integral equation frequency GHz geometry of Fig Green's function ground plane highly permeable material impedance line impedance transforming balun inductance per unit inner coaxial line input reflection coefficient integral LlAz magnetic flux density magnetic wall matrix method of moments microstrip lines mode characteristic impedance mode of propagation mode phase velocity mode transmission lines odd mode impedances ohms OPNODE outer coaxial outer conducting box parameters passband phase odd planar transmission lines printed circuit board proposed balun region relative permeability relative phase velocity shown in Fig shunting impedance sinh slotline solution technique substrip toroid unbalanced lines unequal phase velocities unit length