Mobile communication device
First Claim
1. A communication device comprising:
- a casing;
an antenna;
at least one metallic member disposed around the casing and provided separately from the antenna;
a ground plane directly connected by a connecting member to a first connection point on the at least one metallic member to define an open end of the at least one metallic member and a transmission path between the first connection point and the open end, the transmission path having a resonant frequency, such that the resonant frequency of the transmission path does not enter within a first frequency band in which the communication device operates; and
a resonance circuit by which the ground plane is connected to a third connection point on the at least one metallic member, the resonance circuit having a stub resonating frequency that lies in a second frequency band that is not used for communication by the communication device.
3 Assignments
0 Petitions
Accused Products
Abstract
Embodiments described herein relate a mobile communication device and techniques to suppress deterioration of antenna characteristics. The mobile device includes metallic members that are disposed around, or in portions of a casing of the mobile device. The metallic member is grounded directly to a ground plane of the mobile device at a first predetermined position. The grounded metallic member forms a stub line that cancels a flow of electric current though the metallic member. Furthermore, the metallic member is also connected to the ground plane, at a second predetermined location, via a resonant circuit. The mobile device is capable of adjusting a phase of the antenna current flowing through the device, when the mobile device is being operated by a user, and thus suppresses deterioration of antenna characteristics in certain desired frequency bands.
9 Citations
18 Claims
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1. A communication device comprising:
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a casing; an antenna; at least one metallic member disposed around the casing and provided separately from the antenna; a ground plane directly connected by a connecting member to a first connection point on the at least one metallic member to define an open end of the at least one metallic member and a transmission path between the first connection point and the open end, the transmission path having a resonant frequency, such that the resonant frequency of the transmission path does not enter within a first frequency band in which the communication device operates; and a resonance circuit by which the ground plane is connected to a third connection point on the at least one metallic member, the resonance circuit having a stub resonating frequency that lies in a second frequency band that is not used for communication by the communication device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A communication device comprising:
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a casing; a plurality of metallic members disposed around the casing, including a first metallic member configured to operate as an antenna including a feed point disposed at one end of the first metallic member and a second metallic member provided separately from the first metallic member; a ground plane directly connected by a connecting member to a first connection point on the second metallic member to define an open end of the second metallic member and a transmission path between the first connection point and the open end, the transmission path having a resonant frequency, such that the resonant frequency of the transmission path does not enter within a first frequency band in which the communication device operates; and a resonance circuit by which the ground plane is connected to a third connection point on the second metallic member, the resonance circuit having a stub resonating frequency that lies in a second frequency band that is not used for communication by the mobile device.
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18. A communication system comprising:
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at least one antenna included in a communication device that is configured to communicate with other communication devices; at least one metallic member disposed around a casing of the communication device and provided separately from the at least one antenna; a ground plane directly connected by a connecting member to a first connection point on the at least one metallic member to define an open end of the at least one metallic member and a transmission path between the first connection point and the open end, the transmission path having a resonant frequency, such that the resonant frequency of the transmission path does not enter within a first frequency band in which the communication device operates; and a resonance circuit by which the ground plane is connected to a third connection point on the at least one metallic member, the resonance circuit having a stub resonating frequency that lies in a second frequency band that is not used for communication by the communication device.
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Specification