Patent ID: 8766739
Filing Date: 2014-07-01
Classification: H01P

Abstract:
1. A microwave frequency tunable filtering balun, comprising a first microwave split ring transmission line resonator and a second microwave split ring transmission line resonator arranged in a bilaterally symmetrical manner, a fourth variable capacitor and a fifth variable capacitor of same parameters, wherein, the first microwave split ring transmission line resonator and the second microwave split ring transmission line resonator are vertically symmetrical about a central line, an unbalanced input port is arranged at a top portion of the first microwave split ring transmission line resonator, a first balanced output port and a second balanced output port are arranged in a vertically symmetrical manner at an upper portion and a lower portion of the second microwave split ring transmission line resonator respectively, a distance between the first balanced output port or the second balanced output port and the central lines is smaller than a distance between the unbalanced input port and the central line, the fourth variable capacitor is connected between two open ends of the first microwave split ring transmission line resonator and the fifth variable capacitor is connected between two open ends of the second microwave split ring transmission line resonator.