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Study on the Technique for Transmission-zeros of LC Filters Constructed on Multilayer Substrates

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Tutor: ChengChongHu
School: Nanjing University of Posts and Telecommunications
Course: Electromagnetic Field and Microwave Technology
Keywords: Band-pass filter,Multilayer dielectric structure,Transmission zeros
CLC: TN713
Type: Master's thesis
Year:  2012
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Filter widely used in the various subsystems of the communication system , such as the various parts , such as access , modulation, demodulation using a filter , to reduce interference , improve the performance of the system . With the improvement of the degree of integration of the communication system , the new requirements for the size of the filter , the filter of the dielectric multilayer structure can effectively reduce the size, suitable for the needs of different systems . Paper design the structure of the multilayer dielectric bandpass filter , through between the laminated metal belt , to create a three - dimensional capacitor inductance structure conducive to achieving the coupled inductor and feedback capacitors , and thereby introduce a transmission zero in the both sides of the pass band of each , greatly inhibited with outside interference. This article uses simulation software HFSS completed the design of the filter , the paper work and contributions include: (1 ) The design of a new structure of the feedback capacitor , the feedback capacitance is large enough ; design a new inductor structure , to facilitate the generation of the coupled inductor and regulation. (2 ) In this paper the design of two different filter units, through the introduction of a feedback capacitance between the input and output ports , so that both sides of the passband of the filter each introduce a transmission zero . (3) on the basis of the above work , wherein a filter unit level cascade , and the introduction of the matching network of the filter cascade , an increase of transmission zeros . In this paper, the design of the new feedback capacitance way into the second filter resonance unit, and when the introduction of the filter cascade series resonant matching network, and the design of the dielectric multilayer structure of the design of the band-pass filter cascade and transmission zeros having some reference value .
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