Radio Receiver, Radio Transmitter, and Hearing Aid

• US 20080267436A1
• Filed: 12/15/2006
• Published: 10/30/2008
• Est. Priority Date: 12/19/2005
• Status: Active Grant

• Current Assignee: NXP B.V. (NXP Semiconductors NV)
• Original Assignee: NXP B.V. (NXP Semiconductors NV)
• Inventors: Kerselaers, Anthony, Elsen, Felix
• Granted Patent: US 8,724,835 B2
• Time in Patent Office: Days
• US Class Current: 381/315
• CPC Class Codes: H01Q 21/29 Combinations of different interacting antenna units for giving a desired directional characteristic H01Q25/00 takes precedence
• CPC Class Codes: H01Q 7/00 Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
• CPC Class Codes: H01Q 9/20 Two collinear substantially straight active elements; Substantially straight single active elements H01Q9/28 takes precedence
• CPC Class Codes: H01Q 9/30 with feed to end of elongated active element, e.g. unipole H01Q9/44 takes precedence

Abstract

A receiver (30) with an antenna circuit is disclosed, which antenna circuit comprises a coil (31) and either a monopole (35) or a dipole connected to the coil (31). The antenna circuit captures a signal with a wavelength transmitted by a transmitter (1). The coil (31) captures the signal and generates therefrom a current having a frequency corresponding to the wavelength. The coil (31) is dimensioned such that the current is distributed uniformly within the coil (31) at each point in time. Preferably, the monopole (35) or a leg of the dipole has a length corresponding to less than 5% of the wavelength. The invention further relates to a radio transmitter of the same kind. Finally, the invention relates to an RFID tag, a smart card, a mobile device, and a hearing aid, each comprising an inventive receiver (30) and/or an inventive transmitter.

Claims

1. A receiver with an antenna circuit, which captures a signal with a wavelength transmitted by a transmitter;

said antenna circuit comprising;

a coil that captures said signal and generates therefrom a current having a frequency corresponding to said wavelength;

said coil being dimensioned such that said current is distributed uniformly within said coil at each point in time; and

either a monopole or a dipole connected to said coil.

2. The receiver of claim 1, wherein the dimension of said coil corresponds to less than 5% of said wavelength.

3. The receiver of claim 1, wherein the length of either said monopole or a leg of said dipole, as applicable, corresponds to less than 5% of said wavelength.

7. An RFID tag comprising a receiver and a transmitter;

at least one of said receiver and transmitter being a receiver of claim 1 and/or a transmitter.

8. A smart card comprising a receiver and a transmitter;

at least one of said receiver and transmitter being a receiver of claim 1 and/or a transmitter.

9. A mobile device comprising at least one of said receiver of claim 1 and said transmitter.

10. A hearing aid system, comprising.

a first module with a sender for sending signals having a wavelength;

and

a second modules with a loudspeaker, said receiver of claim 1 for receiving said signals, and a signal-processing device for processing said received signals and for controlling said loudspeaker.

4. A transmitter with an antenna circuit, which transmits a signal with a wavelength;

said antenna circuit comprising;

a coil dimensioned such that a current flowing through said coil and related to said transmitted signal is distributed uniformly within said coil at each point in time; and

either a monopole or a dipole connected to said coil.

5. The transmitter of claim 4, wherein the dimension of said coil corresponds to less than 5% of said wavelength.

6. The transmitter of claim 4, wherein the length of either said monopole or a leg of said dipole, as applicable, corresponds to less than 5% of said wavelength.