Radio terminal device antenna and radio terminal device
First Claim
1. An antenna for a radio terminal device comprising:
- (a) an antenna element;
(b) and an antenna characteristic switching section for switching the antenna characteristic between a balanced feeding characteristics and an unbalanced feeding characteristics by switching between states in which a current distribution exists only on and in a vicinity of the antenna element and in which the current distribution exists not only on and in the vicinity of the antenna element but also on other portions.
1 Assignment
0 Petitions
Accused Products
Abstract
A radio terminal device has an antenna element, a coil, a switch, an RF circuit section and a conductive substrate. The switch is used to switch between a case where current distribution exists only in the antenna element and its vicinities and a case where the current distribution exists not only in the antenna element and its vicinities but also in other places. Additionally, the switch is switched in accordance with the usage pattern in which the user uses the radio terminal device (e.g., telephone call and data communication). This allows the transmission/reception to be performed with the antenna polarization and directivity suitable for the usage pattern. Thus, there can be provided a radio terminal device that exhibits a reception characteristic suitable for a respective situation.
33 Citations
22 Claims
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1. An antenna for a radio terminal device comprising:
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(a) an antenna element; (b) and an antenna characteristic switching section for switching the antenna characteristic between a balanced feeding characteristics and an unbalanced feeding characteristics by switching between states in which a current distribution exists only on and in a vicinity of the antenna element and in which the current distribution exists not only on and in the vicinity of the antenna element but also on other portions. - View Dependent Claims (2, 3)
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4. An antenna for a radio terminal device comprising:
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(a) an antenna element; and (b) an antenna characteristic switching section for switching between states in which a current distribution exists only on and in a vicinity of the antenna element and in which the current distribution exists not only on and in the vicinity of the antenna element but also on other portions, wherein the antenna characteristic switching section has either of a switch and a diode, and a coil connected to each other in series. - View Dependent Claims (5)
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6. A radio terminal device comprising:
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(a) an antenna for a radio terminal device, said antenna including; (1) an antenna element, and (2) an antenna characteristic switching section for switching the antenna characteristic between a balanced feeding characteristics and an unbalanced feeding characteristics by switching between states in which a current distribution exists only on and in a vicinity of the antenna element and in which the current distribution exists not only on and in the vicinity of the antenna element but also on other portions; and (b) a RF circuit section connected to one end of the antenna element. - View Dependent Claims (7)
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8. A radio terminal device comprising;
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(a) an antenna for a radio terminal device, said antenna including; (1) an antenna element, and (2) an antenna characteristic switching section for switching between states in which a current distribution exists only on and in a vicinity of the antenna element and in which the current distribution exists not only on and in the vicinity of the antenna element but also on other portions; and (b) a RF circuit section connected to one end of the antenna element, wherein the antenna element is connected with a conductive substrate arranged close in parallel to a long side of the antenna element with a sufficiently small spacing as compared with a wavelength in a twisted position relationship, and the antenna characteristic switching section is connected to an other end of the antenna element in a vicinity of the conductive substrate, for changing a state of continuity with the conductive substrate. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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16. A radio terminal device comprising:
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(a) an antenna element; (b) a conductive substrate arranged close in parallel to a long side of the antenna element with a sufficiently small spacing as compared with a wavelength in a twisted position relationship; (c) a balanced/unbalanced converter connected to both ends of the antenna element; (d) a RF circuit section connected to said antenna element through said balanced/unbalanced converter; and (e) an antenna characteristic switching section connected to the antenna element in a vicinity of the conductive substrate, for changing a state of continuity with the conductive substrate. - View Dependent Claims (17, 18, 19, 20, 21, 22)
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Specification