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

Inactive Publication Date: 2011-05-18
EAST CHINA JIAOTONG UNIVERSITY
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, while the characteristics are improved, on the one hand, the volume of the filter increases, and on the other hand, the loss of the filter also increases.

Method used

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Embodiment Construction

[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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Abstract

The invention discloses an LTCC (low temperature co-fired ceramic) wide-stop band band-pass filter. The filter comprises three 1/4-wavelength short-circuit stepped-impedance resonator with different shapes on different layers, wherein the three resonators are staggered in an LTCC substrate and formed by combining short-circuit stepped-impedance resonators loaded on adjacent layers with capacitor chips respectively; and the three resonators have the same fundamental frequency and different secondary harmonics and higher harmonic frequencies. Through the invention, the structural characteristics of LTCC are made full use in the arrangement of the resonators so that the three resonators are positioned on different circuit layers respectively, staggered distribution is realized, and the circuit volume is reduced; moreover, the 1/4-wavelength resonators have the same fundamental frequency and different shapes and higher harmonic frequencies, the parasitic passband of the filter is effectively suppressed, and the stop band property of the filter is improved. The invention is suitable for the microwave filtering circuits.

Description

technical field [0001] The invention relates to an LTCC wide stopband bandpass filter, which belongs to the technical field of microwave filter devices. Background technique [0002] In order to reduce the loss and obtain a higher quality factor while the device is miniaturized, new materials and technologies are needed. Among many microwave dielectric materials, low-temperature co-fired ceramics (LTCC) have the advantages of high moisture resistance, high temperature resistance, high thermal conductivity, low dielectric loss, and high conductivity materials, simple manufacturing process, and low cost. Make it more and more widely used in high frequency. [0003] To improve the stopband characteristics of the filter, a common method is to increase the number of stages of the filter. Although increasing the number of filter stages can improve the sideband characteristics of the filter, the stop band of the filter becomes steeper. However, while the characteristics are impr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01P1/20H01P1/212H01P7/00H03H7/075
Inventor 官雪辉江山刘海文
Owner EAST CHINA JIAOTONG UNIVERSITY
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