Controllable multi-band antenna device and portable radio communication device comprising such an antenna device
First Claim
1. An antenna device for a portable radio communication device operable in at least a first and a second frequency band, the antenna device comprising:
- a first electrically conductive radiating element having a first edge, a feeding portion connectable to a radio frequency feed device of the radio communication device and a grounding portion connectable to a ground device;
a second electrically conductive radiating element having a first edge and a second edge;
a controllable switch comprising a diode between the first edge of the first radiating element and the first edge of the second radiating element for selectively interconnecting and disconnecting the radiating elements, the state of the switch being controlled by means of a control voltage input; and
a passive filter comprising a resistor and electrically connected directly to only the second edge of the second radiating element and the control voltage input such that the filter has purely resistive impedance, wherein the filter is arranged to block radio frequency signals when a current level through the diode is between about 5 milliamps and about 15 milliamps such that the diode is conductive and electrically interconnecting the radiating elements.
3 Assignments
0 Petitions
Accused Products
Abstract
A multi-band antenna device for a portable radio communication device has first and second radiating elements (10, 20′). A controllable switch (30) is arranged between the radiating elements for selectively interconnecting and disconnecting thereof. The state of the switch is controlled by means of a control voltage input (VSwitch). A filter (40) comprising a pure resistance that blocks radio frequency signals is arranged between the second radiating element and the control voltage input. By means of this arrangement, two broad and spaced apart frequency bands are obtained with retained performance and small overall size of the antenna device. A communication device comprising such an antenna device is also provided.
37 Citations
20 Claims
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1. An antenna device for a portable radio communication device operable in at least a first and a second frequency band, the antenna device comprising:
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a first electrically conductive radiating element having a first edge, a feeding portion connectable to a radio frequency feed device of the radio communication device and a grounding portion connectable to a ground device; a second electrically conductive radiating element having a first edge and a second edge; a controllable switch comprising a diode between the first edge of the first radiating element and the first edge of the second radiating element for selectively interconnecting and disconnecting the radiating elements, the state of the switch being controlled by means of a control voltage input; and a passive filter comprising a resistor and electrically connected directly to only the second edge of the second radiating element and the control voltage input such that the filter has purely resistive impedance, wherein the filter is arranged to block radio frequency signals when a current level through the diode is between about 5 milliamps and about 15 milliamps such that the diode is conductive and electrically interconnecting the radiating elements. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 11, 12, 13, 14, 15, 16)
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10. A portable radio communication device, comprising a generally planar printed circuit board and an antenna device connected to a radio frequency feed device with electronic circuits provided for transmitting and/or receiving RF signals, and a ground device, wherein the antenna device comprises:
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a first electrically conductive radiating element having a first edge, a feeding portion connected to the radio frequency feed device of the radio communication device and a grounding portion connected to the ground device; a second electrically conductive radiating element having a first edge and a second edge; a controllable switch comprising a diode arranged between the first edge of the first radiating element and the first edge of the second radiating element for selectively interconnecting and disconnecting the radiating elements, the state of the switch being controlled by means of control voltage input; and a passive filter comprising a resistor and electrically connected directly to only the second edge of the second radiating element and the control voltage input such that the filter has a purely resistive impedance, and wherein the filter is arranged to block radio frequency signals when a current level through the diode is between about 5 milliamps and about 15 milliamps such that the diode is conductive and electrically interconnecting the radiating elements. - View Dependent Claims (17, 18)
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19. A method of operating an antenna device in a portable radio communication device operable in at least a first and a second frequency band, the antenna device including a first electrically conductive radiating element having a first edge, a feeding portion connectable to a radio frequency feed device of the radio communication device and a grounding portion connectable to a ground device;
- a second electrically conductive radiating element having a first edge and a second edge, a controllable switch comprising a diode between the first edge of the first radiating element and the first edge of the second radiating element for selectively interconnecting and disconnecting the radiating elements, the state of the switch being controlled by means of a control voltage input, the method comprising filtering the control voltage input with a passive filter having a purely resistive impedance and electrically connected directly to only the second edge of the second radiating element and the control voltage input, whereby the passive filter is operable for blocking radio frequency signals when a current level through the diode is between about 5 milliamps and about 15 milliamps such that the diode is conductive and electrically interconnecting the radiating elements.
- View Dependent Claims (20)
Specification