Antenna device and portable radio communication device comprising such antenna device

An antenna device for a portable radio communication device adapted for receiving and/or transmitting radio signals in at least a first and a second operating frequency band, the antenna device comprising:

• a half-loop radiating element including a feeding portion and a grounding portion, and arranged to operate at FM frequencies;
• a capacitor at the feeding portion;
• and
• an inductor at the grounding portion;
• the half-loop radiating element arranged to simultaneously with FM frequencies operate at frequencies at least ten times higher than FM frequencies;
• the capacitor is arranged to short circuit the half-loop radiating element to ground for frequencies at least ten times higher than FM frequencies;
• and
• the inductor is arranged to short circuit the half-loop radiating element to ground for FM frequencies.

An antenna device for a portable radio communication device, the antenna device comprising:

• a half-loop radiating element including a feeding portion and a grounding portion, the half-loop radiating element configured to simultaneously with FM frequencies operate at frequencies at least ten times higher than FM frequencies, the half-loop radiating element configured such that feeding of the FM frequencies is performed through the feeding portion and the feeding of the frequencies at least ten times higher than FM frequencies is performed through the grounding portion;
• a capacitor connected to the feeding portion, and configured to short circuit the half-loop radiating element to ground for frequencies at least ten times higher than FM frequencies;
• and
• an inductor connected to the grounding portion, and configured to short circuit the half-loop radiating element to ground for FM frequencies.

A portable radio communication device comprising:

• a half-loop radiating element configured to simultaneously with FM frequencies operate at frequencies at least ten times higher than FM frequencies, the half-loop radiating element including a feeding portion operable for feeding of the FM frequencies and a grounding portion operable for feeding the frequencies at least ten times higher than FM frequencies;
• a capacitor connected to the feeding portion, and configured to short circuit the half-loop radiating element to ground for frequencies at least ten times higher than FM frequencies;
• and
• an inductor connected to the grounding portion, and configured to short circuit the half-loop radiating element to ground for FM frequencies;
• a FM receiver connected to the antenna device at the feeding portion;
• and
• another receiver for frequencies at least ten times higher than FM frequencies connected to the antenna device at the grounding portion.