A novel dual-band tunable notch filter with controllable center frequencies and bandwidths |
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| Affiliation: | 1. College of Animal Sciences and Veterinary Medicines, Shanxi Agricultural University, Taigu 030801, Shanxi, PR China;2. Animal Husbandry and Veterinary Bureau of Yuci County, Yuci 030600, Shanxi, PR China;2. Universidad Técnica de Ambato (UTA), Av. Los Chasquis y Río Payamino, Ambato, Ecuador;1. Department of Animal Sciences, Veterinary School, Universidad de Federal de Minas Gerais Avenida Antonio Carlos, 6627 Campus UFMG, Belo Horizonte, Brazil;2. Spanish Council for Scientific Research (CSIC), Institute of Environmental Assessment and Water Research, C/ Jordi Girona 18-26, 08034 Barcelona, Spain;3. Universidad de Antioquia, Departamento de Ingeniería Química, Facultad de Ingeniería, Grupo Catálisis Ambiental, Calle 70 No. 52-2, Medellín, Colombia;1. Jiangsu Key Laboratory of Marine Biotechnology, Huaihai Institute of Technology, Lianyungang 222005, China;2. Co-Innovation Center of Jiangsu Marine Bio-industry Technology, Lianyungang 222005, China;3. Zhejiang Institute of Freshwater Fisheries, Huzhou 313001, China;4. Beijing Institute of Life Science, Chinese Academy of Science, Beijing 100101, China |
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| Abstract: | This article proposes a new dual-band tunable bandstop filter. This tunable filter is composed of two separate parts, the transmission line, and coupled stubs that each connect to three varactors. The center frequency and bandwidth in each band can be controlled individually. Moreover, the LC equivalent circuit of the proposed filter is calculated, and the results are simulated. In the proposed filter, the simulations show that the first stopband can be tuned in a frequency range from 1.2 to 1.9 GHz with 10-dB absolute bandwidth 310 ± 30 MHz, whereas the second stopband varies from 2.5 to 3.3 GHz with the 10-dB absolute bandwidth 720 ± 20 MHz. These two stopbands can also be tuned independently. Furthermore, the bandwidth of each fixed center frequency can be changed easily. The fabricated proposed filter validates the simulation results. The compact filter has an effective size of 9 × 27.5 mm2. |
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| Keywords: | Dual-band bandstop Tunable Microstrip LC model Varactor |
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