Circuit for signal connection, device for inductive power transfer and for signal transmission

1. A circuit, comprising:

an antenna structure configured to provide near-field signal transmission in response to receiving a communication signal; and

a filter circuit configured to operate on the communication signal prior to the communication signal being received by the antenna structure, wherein the filter circuit is an even-numbered order filter circuit, wherein the ordinal number is at least 4, wherein an amplitude response (FG) of the circuit decreases monotonically in a defined frequency range, wherein the filter circuit is configured such that additionally at a further defined frequency an imaginary proportion of an impedance of the circuit is zero or deviates from zero by not more than a fundamental frequency.

2. The circuit of claim 1 , including a compensation circuit.

3. The circuit of claim 1 , wherein the amplitude response (FG) of the circuit decreases only monotonically in the defined frequency range.

4. The circuit of claim 1 , wherein a minimum frequency of the defined frequency range is 14.4 MHz.

5. The circuit of claim 1 , wherein the filter circuit is configured so that an impedance of the circuit in a defined frequency range corresponds to a defined impedance.

6. The circuit of claim 1 , wherein the filter circuit is configured such that additionally at a further defined frequency an imaginary proportion of an impedance of the circuit is zero or deviates from zero by not more than a fundamental frequency.

7. The circuit of claim 1 , wherein the filter circuit has at least one grounding section (EA) which is connected with a reference potential (RP).

8. The circuit of claim 7 , wherein the filter circuit is designed symmetrically relative to the grounding section (EA).

9. A circuit, comprising:

an antenna structure configured to provide near-field signal transmission in response to receiving a communication signal; and

a filter circuit configured to operate on the communication signal prior to the communication signal being received by the antenna structure, wherein the filter circuit is an even-numbered order filter circuit, wherein the ordinal number is at least 4, wherein an amplitude response (FG) of the circuit decreases monotonically in a defined frequency range, wherein the filter circuit is configured such that at a defined frequency a return loss (RL) of the circuit is less than a first defined value and/or that in a defined frequency range a return loss (RL) is less than a further defined value.

10. A device for inductive power transfer and for signal transmission, comprising:

a microcontroller configured to generate a near-field communication signal; and

a circuit, comprising: according to an antenna structure configured to provide near-field signal transmission in response to receiving a communication signal;

a filter circuit configured to operate on the communication signal prior to the communication signal being received by the antenna structure, wherein the filter circuit is an even-numbered order filter circuit, wherein the ordinal number is at least 4, wherein an amplitude response (FG) of the circuit decreases monotonically in a defined frequency range;

a winding structure that is configured to transfer power inductively via a generated magnetic field; and

a comb-shaped damping structure configured to dampen an electromagnetic field produced by the winding structure.

11. The device of claim 10 , further including a mobile antenna structure configured to transmit and receive mobile radio signals.

12. The device of claim 11 , wherein a section of the damping structure and a section of the mobile antenna structure overlap in a common projection plane.

13. The device of claim 10 , wherein a section of the antenna structure and a section of the winding structure overlap in a common projection plane.