Abstract: A meta-material filter that may be used in constructing a duplex filter is provided. The metal-material filter is comprised of a substrate, a plurality of metal strips periodically positioned on the substrate, and a ground plane spaced from the plurality of metal strips. The plurality of metal strips may be arranged mono-periodically or bi-periodically.

Abstract: A meta-material filter that may be used in constructing a duplex filter is provided. The metal-material filter is comprised of a substrate, a plurality of metal strips periodically positioned on the substrate, and a ground plane spaced from the plurality of metal strips. The plurality of metal strips may be arranged mono-periodically or bi-periodically.

Abstract: A method and an apparatus are provided for impedance matching using an analog circuit. The method comprises providing the analog circuit to substantially match a start impedance to an end impedance and tuning a performance parameter of an associated circuit using the analog circuit operating at a high power level. The analog circuit may transform the start impedance to the end impedance using a characteristic impedance in a range above the start impedance and the end impedance. By reconfiguring the analog circuit, the associated circuit may operate at one of a first, second, or higher order frequency bands. By using a matching transformation process, reconfigurable matching circuits for medium and/or high power applications may be provided by using available lower power reconfiguration elements. In the matching transformation process, the intermediate impedance at which the reconfiguration is performed is higher than the matching processes used for lower power reconfiguration elements.

Abstract: A method and an apparatus are provided for impedance matching using an analog circuit. The method comprises providing the analog circuit to substantially match a start impedance to an end impedance and tuning a performance parameter of an associated circuit using the analog circuit operating at a high power level. The analog circuit may transform the start impedance to the end impedance using a characteristic impedance in a range above the start impedance and the end impedance. By reconfiguring the analog circuit, the associated circuit may operate at one of a first, second, or higher order frequency bands. By using a matching transformation process, reconfigurable matching circuits for medium and/or high power applications may be provided by using available lower power reconfiguration elements. In the matching transformation process, the intermediate impedance at which the reconfiguration is performed is higher than the matching processes used for lower power reconfiguration elements.

Abstract: The application relates to transmission power control in transmission systems, in particular mobile radio systems. One object of the invention is to indicate a way of guaranteeing, compared with the state of the art, improved, in particular dynamic, control of transmission powers within predefinable emitted interference requirements with, in particular, increased efficiency and reduced power consumption. For this purpose, the invention provides for the filtering of an amplified transmission signal to be divided up between a narrower-band tunable pre-filter (4) and a broadband post-filter (10). To perform this operation, a signal-amplification circuit is proposed which comprises a tunable filter (4) which is connected downstream of a power amplifier (2).

Abstract: The application relates to transmission power control in transmission systems, in particular mobile radio systems. One object of the invention is to indicate a way of guaranteeing, compared with the state of the art, improved, in particular dynamic, control of transmission powers within predefinable emitted interference requirements with, in particular, increased efficiency and reduced power consumption. For this purpose, the invention provides for the filtering of an amplified transmission signal to be divided up between a narrower-band tunable pre-filter (4) and a broadband post-filter (10). To perform this operation, a signal-amplification circuit is proposed which comprises a tunable filter (4) which is connected downstream of a power amplifier (2).