Ferroelectric devices and method relating thereto
First Claim
1. An electrically controllable/tunable microwave device having a capacitance which depends on applied voltage C(V), the device comprising:
- a ferroelectric substrate with a variable dielectric permittivity and conducting electrodes arranged on said substrate;
at least two sections or parts of the substrate/electrodes for each of which different electrical field strengths are generated upon voltage application, wherein said generated electrical field strengths are controlled by design of the device and/or the voltage application such that a slope (dC(dV) of voltage dependence of the capacitance (C(V)) of the microwave device can be controlled;
wherein each section has a thickness and/or an electrode plate area differing from the thickness(es) and/or the plate area(s) of the other section(s), and wherein the dependance of the capacitance on the voltage is controlled by appropriate selection of the thicknesses and the electrode plate areas of the sections; and
wherein a same voltage is applied to the different sections and wherein, for the applied voltage, the generated electric field of a section depends on the thickness and the plate area of the section.
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Accused Products
Abstract
The present invention relates to an electrically controllable/tunable microwave device comprising a ferroelectric substrate with a variable dielectric permitivity and conducting electrodes, arranged on said substrate, and the capacitance of which depends on applied voltage C/V), the microwave device comprises at least two sections or parts of the substrate/electrodes for each of which different electrical field strengths are generated upon voltage application. Said generated electrical field strengths are controlled by means of the design of the device and/or the voltage application such that the slope (dC(dV) of the voltage dependence of the capacitance (C(V) of the microwave device can be controlled.
5 Citations
18 Claims
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1. An electrically controllable/tunable microwave device having a capacitance which depends on applied voltage C(V), the device comprising:
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a ferroelectric substrate with a variable dielectric permittivity and conducting electrodes arranged on said substrate; at least two sections or parts of the substrate/electrodes for each of which different electrical field strengths are generated upon voltage application, wherein said generated electrical field strengths are controlled by design of the device and/or the voltage application such that a slope (dC(dV) of voltage dependence of the capacitance (C(V)) of the microwave device can be controlled; wherein each section has a thickness and/or an electrode plate area differing from the thickness(es) and/or the plate area(s) of the other section(s), and wherein the dependance of the capacitance on the voltage is controlled by appropriate selection of the thicknesses and the electrode plate areas of the sections; and wherein a same voltage is applied to the different sections and wherein, for the applied voltage, the generated electric field of a section depends on the thickness and the plate area of the section. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of controlling a voltage/capacitance (V/C) characteristic of an electrically controllable/tunable microwave device comprising a ferroelectric substrate, with a variable dielectric permittivity and conducting electrodes disposed on said substrate, the method comprising the steps of:
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disposing the ferroelectric substrate and the electrodes such that the device comprises at least two sections or parts; providing for voltage application to the sections or parts such that a different electric field strength is generated for each of the sections or parts of the device, or that a substantially continuously varying electric field is generated, for controlling the slope (dC/dV) of the voltage dependence of the capacitance; designing the substrate and the electrodes such that differently sized and/or shaped sections are formed; and
,applying a same voltage to the different sections such that different electric field strengths are generated for each of said sections. - View Dependent Claims (14, 15, 16, 17, 18)
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Specification