Antenna device and portable radio communication device comprising such an antenna device
First Claim
Patent Images
1. An antenna device for a portable radio communication device operable in at least four different frequency bands, the antenna device comprising:
- a first electrically conductive radiating element;
a second electrically conductive radiating element;
a junction point connecting the first and second electrically conductive radiating elements;
a first conductor arranged between the junction point and a source of RF signals;
a second conductor arranged between the junction point and the source of RF signals, wherein the second conductor has an electric length that is shorter than an electric length of the first conductor;
a controllable switch element provided in series with the second conductor, said controllable switch element being controllable by a current flowing through the controllable switch element;
a first filter block provided in series with the second conductor, between the first conductor and the second conductor wherein a common junction between the first conductor and the first filter block is connected to the source of RF signal;
said first filter block being arranged to block signals with a frequency lower than the at least four different frequency bands;
the first conductor and the first radiating element are connected in series and are together arranged to resonate in a first lower frequency band with the controllable switch element opened;
the first conductor and the second radiating element are together arranged to resonate in a first higher frequency band with the controllable switch element opened;
the second conductor and the first radiating element are connected in series and are together arranged to resonate in a second lower frequency band with the controllable switch element closed, the second lower frequency band being higher than the first lower frequency band; and
the second conductor and the second radiating element are together arranged to resonate in a second higher frequency band with the controllable switch element closed, the second higher frequency band being higher than the first higher frequency band.
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Abstract
A quad-band antenna device (10) for a portable radio communication device comprises two radiating elements (12, 14) of different lengths and two common conductors (18, 20) of different lengths. One of the common conductors can be selectively connected in and out with respect to radio frequency signals in order to adjust the total electrical length of the antenna device, thereby making it operable in four different frequency bands.
10 Citations
19 Claims
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1. An antenna device for a portable radio communication device operable in at least four different frequency bands, the antenna device comprising:
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a first electrically conductive radiating element; a second electrically conductive radiating element; a junction point connecting the first and second electrically conductive radiating elements; a first conductor arranged between the junction point and a source of RF signals;
a second conductor arranged between the junction point and the source of RF signals, wherein the second conductor has an electric length that is shorter than an electric length of the first conductor;a controllable switch element provided in series with the second conductor, said controllable switch element being controllable by a current flowing through the controllable switch element; a first filter block provided in series with the second conductor, between the first conductor and the second conductor wherein a common junction between the first conductor and the first filter block is connected to the source of RF signal;
said first filter block being arranged to block signals with a frequency lower than the at least four different frequency bands;the first conductor and the first radiating element are connected in series and are together arranged to resonate in a first lower frequency band with the controllable switch element opened; the first conductor and the second radiating element are together arranged to resonate in a first higher frequency band with the controllable switch element opened; the second conductor and the first radiating element are connected in series and are together arranged to resonate in a second lower frequency band with the controllable switch element closed, the second lower frequency band being higher than the first lower frequency band; and the second conductor and the second radiating element are together arranged to resonate in a second higher frequency band with the controllable switch element closed, the second higher frequency band being higher than the first higher frequency band. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A portable radio communication device comprising an antenna device operable in at least four different frequency bands, the antenna device comprising:
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a first electrically conductive radiating element; a second electrically conductive radiating element; a junction point connecting the first and second electrically conductive radiating elements; a first conductor arranged between the junction point and a source of RF signals;
a second conductor arranged between the junction point and the source of RF signals, wherein the second conductor has an electric length that is shorter than an electric length of the first conductor;a controllable switch element provided in series with the second conductor, said controllable switch element being controllable by a current flowing through the controllable switch element; a first filter block provided in series with the second conductor, between the first conductor and the second conductor wherein a common junction between the first conductor and the first filter is connected to the source of RF signal;
said first filter block being arranged to block signals with a frequency lower than the at least four different frequency bands;a second filter block arranged between the second conductor and ground, wherein the first filter is arranged to block signals in the at least four different frequency bands; a third filter block arranged between the first conductor and a control voltage input (V switch); the first conductor and the first radiating element are connected in series and are together arranged to resonate in a first lower frequency band with the controllable switch element opened; the first conductor and the second radiating element are together arranged to resonate in a first higher frequency band with the controllable switch element opened; the second conductor and the first radiating element are connected in series and are together arranged to resonate in a second lower frequency band with the controllable switch element closed, the second lower frequency band being higher than the first lower frequency band; and the second conductor and the second radiating element are together arranged to resonate in a second higher frequency band with the controllable switch element closed, the second higher frequency band being higher than the first higher frequency band. - View Dependent Claims (18)
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19. An antenna device for a portable radio communication device operable in at least five different frequency bands, the antenna device comprising:
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a first electrically conductive radiating element; a second electrically conductive radiating element; a junction connecting the first and second radiating elements; a first conductor connected between the junction point and a source of RF signals; a second conductor connected in parallel with the first conductor between the junction point and the source of RF signals, wherein the second conductor has an electric length that is shorter than the electric length of the first conductor; a first controllable switch element provided in series with the second conductor, said controllable switch element being controllable by a current flowing through the controllable switch element; a first filter block provided in series with the second conductor, between the first conductor and the second conductor wherein a common junction between the first conductor and the first filter is connected to the source of RF signal;
said first filter block being arranged to block signals with a frequency lower than the at least four different frequency bands;a second controllable switch element provided between the first filter block and the first conductor at an end of the second conductor opposite to where the first controllable switch element is provided; and a conductive elongated parasitic element provided close to the first conductor; wherein the first conductor and the first radiating element are connected in series and are together arranged to resonate in a first lower frequency band with the first and second controllable switch elements opened; the first conductor and the second radiating element are together arranged to resonate in a first higher frequency band with the first controllable switch element opened; the second conductor and the first radiating element are connected in series and are together arranged to resonate in a second lower frequency band with the first controllable switch element closed, the second lower frequency band being higher than the first lower frequency band; and the second conductor and the second radiating element are together arranged to resonate in a second higher frequency band with the first controllable switch element closed, the second higher frequency band being higher than the first higher frequency band; whereby the second controllable switch element is operable for improving decoupling of the second conductor when the controllable switch elements are open; and the parasitic element provides a fifth frequency band such that the antenna device is operable in at least five different frequency bands.
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Specification