A triple-channel bandpass filter with switchable and tunable functions is proposed,which is based on a triple-mode cross resonator.The varactors and switching diodes are loaded at the end of the resonator.Because of t...A triple-channel bandpass filter with switchable and tunable functions is proposed,which is based on a triple-mode cross resonator.The varactors and switching diodes are loaded at the end of the resonator.Because of the use of switches,resonators have four working states:conventional single-mode,two dual-modes,and one triple-mode.The varactor makes the channel independently adjustable.Finally,a triple-channel bandpass filter with switchable and tunable functions is designed by using two identical triple-mode resonator coupling structures.To solve the problem of whether each channel in the multi-channel filter is independently adjustable,this paper gives a simple and rigorous judgment method,namely rank criterion,which is a necessary and sufficient condition for each channel to be independently adjustable.The method of designing an element variable coupling matrix(EVCM)is adopted,which can not only obtain the desired frequency response through adjustable elements but also help to select resonators and coupling modes in the actual circuit design.The final circuit size of the designed filter is 0.29λg×0.26λg.The measured results are in good agreement with the simulation results.展开更多
Ever since 2005, the US' shale oil and gas production growth and effective adjustment of domestic energy consumption mix have made it possible for the country to be less dependent upon imported energy and gain ene...Ever since 2005, the US' shale oil and gas production growth and effective adjustment of domestic energy consumption mix have made it possible for the country to be less dependent upon imported energy and gain energy independence. What should we learn from it to guarantee energy supply security? This paper tried to answer the question.展开更多
基金the National Natural Science Foundation of China(Grant No.61471094)the Science and Technology Support Program of Sichuan Province,China(Grant Nos.2019YFG0499 and 2020YFG0231)。
文摘A triple-channel bandpass filter with switchable and tunable functions is proposed,which is based on a triple-mode cross resonator.The varactors and switching diodes are loaded at the end of the resonator.Because of the use of switches,resonators have four working states:conventional single-mode,two dual-modes,and one triple-mode.The varactor makes the channel independently adjustable.Finally,a triple-channel bandpass filter with switchable and tunable functions is designed by using two identical triple-mode resonator coupling structures.To solve the problem of whether each channel in the multi-channel filter is independently adjustable,this paper gives a simple and rigorous judgment method,namely rank criterion,which is a necessary and sufficient condition for each channel to be independently adjustable.The method of designing an element variable coupling matrix(EVCM)is adopted,which can not only obtain the desired frequency response through adjustable elements but also help to select resonators and coupling modes in the actual circuit design.The final circuit size of the designed filter is 0.29λg×0.26λg.The measured results are in good agreement with the simulation results.
文摘Ever since 2005, the US' shale oil and gas production growth and effective adjustment of domestic energy consumption mix have made it possible for the country to be less dependent upon imported energy and gain energy independence. What should we learn from it to guarantee energy supply security? This paper tried to answer the question.
