Multi-strip LTCC resonator BPF

Multi-strip resonator BPF is fabricated in the LTCC configuration. The center frequency is 3.5GHz, fractional bandwidth is 0.1 and 3-stage Chebyshev type is designed. The relative permittivity of the ceramic is 18.3, resulting in the size as small as 2.3 × 1.6 × 0.73mm. The in-band loss is 3.5 dB, which could be reduced in the stable mass production state. The spurious suppression of more than 30 dB is attained up to the frequency higher than 10GHz.