DUAL-MODE SPLIT MICROSTRIP RESONATOR FOR COMPACT NARROWBAND BANDPASS FILTERS

A straight split dual-mode microstrip resonator is proposed. The frequencies of the two flrst oscillation modes in the resonator may be brought closer together by adjusting a split parameter whereas the frequency of the third mode remains approximately equal to the doubled average frequency of the flrst and the second modes. It is shown that formulas derived within 1D model give qualitatively true relations between the resonant frequencies and the structure parameters of the resonator. Examples of narrowband bandpass fllters of the fourth and the sixth order are described. Transmission zeros below and above the passband substantially improve the fllter's performance. The simulated frequency response of the three-resonator dual-mode fllter is compared with the measured response of the fabricated fllter.