LTCC wide-stop band band-pass filter
A filter and stopband technology, which is applied in the field of microwave filter devices, can solve the problems of increased filter volume and filter loss, and achieve the effects of reducing volume, improving stopband characteristics, and compact structure
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[0014] Embodiment of the present invention LTCC wide stopband bandpass filter such as figure 1 As shown, three resonators are interleavedly embedded in the LTCC substrate to form a three-stage bandpass filter. The three resonators are Ⅰ (5, 5'), Ⅱ (6, 6'), Ⅲ (7 , 7'), the fundamental frequencies of the three resonators are all at 2.45GHz. Due to the different structures of the resonators, the first harmonics are set at 8.3GHz, 10.2GHz, and 11.9GHz respectively, so that the parasitic passbands are suppressed. The transmission loss at the first spurious frequency is below -18dB. Such as figure 2 Shown is the schematic diagram of the structure of the LTCC ladder resonator II (6, 6').
[0015] The signal is input from input port 3, coupled to resonator I (5, 5') by tap form, then coupled to resonator II (6, 6') by resonator I, and then coupled to resonator III by resonator II (7, 7'), and finally output through tap 4. Since the three resonators have the same fundamental frequ...
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