Multiband bandpass filter with transmission-zeros and substrate structure thereof

A multiband bandpass filter with transmission-zeros mainly includes an input terminal, an output terminal, a bandpass filter unit, at least a series feedback resonator electrically connecting to the bandpass filter unit in series and at least a parallel coupling resonator electrically connecting to the bandpass filter unit in parallel. The bandpass filter unit includes a first resonator electrically connecting to the input terminal and a second resonator electrically connecting to the output terminal, the first resonator has a first resonator's inductor and a first resonator's capacitor, the second resonator has a second resonator's inductor and a second resonator's capacitor. The series feedback resonator has a series feedback resonator's capacitor and a series feedback resonator, s inductor. The parallel coupling resonator has a parallel coupling resonator's capacitor and a parallel coupling resonator's inductor.