Antenna switch with adaptive filter
First Claim
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1. Antenna switch which is arranged to alternately operate in a receive mode and a transmit mode, the antenna switch comprising:
- an adaptive filter for coupling a signal processing means to an antenna during the receive mode and for electrically insulating the signal processing means from the antenna during the transmit mode, wherein the adaptive filter comprises a circuit arrangement of at least one capacitor and at least one inductor, wherein;
a group of circuit components of the circuit arrangement implements a transmit filter stage with a first passband during the transmit mode, wherein the first passband is a band-pass passband, wherein thea high-pass filter coupled between the antenna and switches for the signal processing means; and
a series arrangement of an inductor, a capacitor, and an inductor switch that are coupled in parallel with the high-pass filter; and
a subset of the group of circuit components of the circuit arrangement implements a receive filter stage with a second passband during the receive mode, wherein the subset of the group of circuit components of the receive filter stage comprises the high-pass filter coupled between the antenna and switches for the signal processing means.
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Abstract
An antenna switch (31) that is arranged to alternately operate in a receive mode and a transmit mode, comprises adaptive filter (30). Herewith, signal processing means (Rx1, Rx2 and Rx3) can be coupled to an antenna (1) during the receive mode and be insulated from the antenna during the transmit mode.
27 Citations
14 Claims
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1. Antenna switch which is arranged to alternately operate in a receive mode and a transmit mode, the antenna switch comprising:
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an adaptive filter for coupling a signal processing means to an antenna during the receive mode and for electrically insulating the signal processing means from the antenna during the transmit mode, wherein the adaptive filter comprises a circuit arrangement of at least one capacitor and at least one inductor, wherein; a group of circuit components of the circuit arrangement implements a transmit filter stage with a first passband during the transmit mode, wherein the first passband is a band-pass passband, wherein the a high-pass filter coupled between the antenna and switches for the signal processing means; and a series arrangement of an inductor, a capacitor, and an inductor switch that are coupled in parallel with the high-pass filter; and a subset of the group of circuit components of the circuit arrangement implements a receive filter stage with a second passband during the receive mode, wherein the subset of the group of circuit components of the receive filter stage comprises the high-pass filter coupled between the antenna and switches for the signal processing means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification