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专利名称：Filter having tunable center frequency
and/or tunable bandwidth
发明人：Rice, Christopher W.,Worstell, Harry R.申请号：EP97307172.3申请日：19970916公开号：EP0833445A2公开日：19980401
专利附图：
摘要：In an RF filter having an input terminal (270), an output terminal (280), a pluralityof resonator elements (211,221,213,223,215,225), and a plurality of coupling reactances(201,203,205,207) for coupling one resonator element to another resonator element, for
coupling the input terminal to a resonator element, and for coupling the output terminalto a resonator element, techniques are disclosed for providing an RF filter having anelectronically tunable center frequency and an electronically tunable bandwidth.According to a specific embodiment disclosed herein, a first shunt reactance (209) isprovided from the input terminal to ground, and a second shunt reactance (217) isprovided from the output terminal to ground. The values of the coupling reactancesremain constant, while the values of the resonator elements, the first shunt reactance,and the second shunt reactance are tuned to provide a specified filter bandwidth and/ora specified center frequency. According to a further embodiment, such a tunable filter isfabricated on a physical substrate having a substantially constant dielectric constant perunit volume, and the coupling reactances include capacitors fabricated using the physicalsubstrate.
申请人：LUCENT TECHNOLOGIES INC.
地址：600 Mountain Avenue Murray Hill, New Jersey 07974-0636 US
国籍：US
代理机构：Buckley, Christopher Simon Thirsk
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