Filtro de Micro-ondas Passa-Baixas de Nona Ordem e Alta Rejeição à Harmônicos usando o Modelo Pseudo-Elíptico
Denis Carlos da Silva
DISSERTAÇÃO
Português
T/UNICAMP Si38f
[Low loss and high-performance pseudo-elliptic low pass filter using a suspended stripline structure]
Campinas, SP : [s.n.], 2024.
1 recurso online (94 p.) : il., digital, arquivo PDF.
Orientador: Leandro Tiago Manêra
Dissertação (mestrado) - Universidade Estadual de Campinas (UNICAMP), Faculdade de Engenharia Elétrica e de Computação
Resumo: This work presents a complete development cycle of a ninth-order low-pass filter for the microwave range. The process involves the methodology, synthesis, electromagnetic simulation, prototyping, and testing of the proposed filter. The prototype is designed to operate in the frequency range...
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Resumo: This work presents a complete development cycle of a ninth-order low-pass filter for the microwave range. The process involves the methodology, synthesis, electromagnetic simulation, prototyping, and testing of the proposed filter. The prototype is designed to operate in the frequency range from DC to 2.5 GHz, using transmission line models in suspended substrate and microstrip, employing Rogers Duroid TM 5880 laminate, with ?r of 2.2 and a thickness of 0.127 mm. Additionally, the pseudo-elliptical synthesis technique with three transmission zeros is applied. Microwave low-pass filters with high selectivity and harmonic rejection are essential in military applications to suppress spurious signals and prevent electromagnetic interference. Designing and prototyping these filters, aiming to achieve rejection levels above 60 dB, pose a significant challenge in the microwave range. The developed filter has a passband from DC to 2.5 GHz, with low insertion loss below 0.35 dB and high rejection capability. It achieves a rejection level greater than 50 dB in the range from 3.1 GHz to 8.9 GHz, with results exceeding 60 dB from 3.3 GHz to 6.8 GHz. Compared to similar filters and even state-of-the-art wideband rejection filters, this filter demonstrates a better trade-off among requirements such as low insertion loss, high roll-off rate in the stopband, and high rejection levels. These results highlight the relevance and potential impact of our work in the field of microwave filters. The work also provides a detailed description of the design and simulation methodology of microwave filters, covering everything from the synthesis of the mathematical model, circuit and 3D electromagnetic simulation stages, to the sensitivity analysis of variables and the challenges faced during prototyping. In the microwave implementation, the step impedance technique is used, with suspended striplines for high-impedance lines and microstrip for low-impedance lines. The quality of the grounding is directly related to the rejection band of these filters. Therefore, this study incorporates ground planes to analyze the sensitivity in the transition from suspended stripline to microstrip. Additionally, the observed transmission zeros align with the values predicted by simulations. The return loss, crucial for system effectiveness, is greater than 17.5 dB in the passband. Furthermore, no resonant frequencies were identified in the stopband, highlighting the robustness and reliability of the developed prototype
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Abstract: This work presents a complete development cycle of a ninth-order low-pass filter for the microwave range. The process involves the methodology, synthesis, electromagnetic simulation, prototyping, and testing of the proposed filter. The prototype is designed to operate in the frequency...
Ver mais
Abstract: This work presents a complete development cycle of a ninth-order low-pass filter for the microwave range. The process involves the methodology, synthesis, electromagnetic simulation, prototyping, and testing of the proposed filter. The prototype is designed to operate in the frequency range from DC to 2.5 GHz, using transmission line models in suspended substrate and microstrip, employing Rogers Duroid TM 5880 laminate, with ?r of 2.2 and a thickness of 0.127 mm. Additionally, the pseudo-elliptical synthesis technique with three transmission zeros is applied. Microwave low-pass filters with high selectivity and harmonic rejection are essential in military applications to suppress spurious signals and prevent electromagnetic interference. Designing and prototyping these filters, aiming to achieve rejection levels above 60 dB, pose a significant challenge in the microwave range. The developed filter has a passband from DC to 2.5 GHz, with low insertion loss below 0.35 dB and high rejection capability. It achieves a rejection level greater than 50 dB in the range from 3.1 GHz to 8.9 GHz, with results exceeding 60 dB from 3.3 GHz to 6.8 GHz. Compared to similar filters and even state-of-the-art wideband rejection filters, this filter demonstrates a better trade-off among requirements such as low insertion loss, high roll-off rate in the stopband, and high rejection levels. These results highlight the relevance and potential impact of our work in the field of microwave filters. The work also provides a detailed description of the design and simulation methodology of microwave filters, covering everything from the synthesis of the mathematical model, circuit and 3D electromagnetic simulation stages, to the sensitivity analysis of variables and the challenges faced during prototyping. In the microwave implementation, the step impedance technique is used, with suspended striplines for high-impedance lines and microstrip for low-impedance lines. The quality of the grounding is directly related to the rejection band of these filters. Therefore, this study incorporates ground planes to analyze the sensitivity in the transition from suspended stripline to microstrip. Additionally, the observed transmission zeros align with the values predicted by simulations. The return loss, crucial for system effectiveness, is greater than 17.5 dB in the passband. Furthermore, no resonant frequencies were identified in the stopband, highlighting the robustness and reliability of the developed prototype
Ver menos
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Filtro de Micro-ondas Passa-Baixas de Nona Ordem e Alta Rejeição à Harmônicos usando o Modelo Pseudo-Elíptico
Denis Carlos da Silva
Filtro de Micro-ondas Passa-Baixas de Nona Ordem e Alta Rejeição à Harmônicos usando o Modelo Pseudo-Elíptico
Denis Carlos da Silva