摘要:
An antenna assembly has a first helical antenna and a second rod antenna extending through inside said first antenna in the axis direction. When the antenna is retracted, the upper end of a conductive portion of the second antenna passes through the first antenna to be positioned below the lower end of the first antenna, and when the antenna is extended, the lower end portion of the conductive portion of the second antenna is electrically connected to the upper end portion of the first antenna. Therefore, the length of the second antenna can be reduced as compared with a length defined based on wavelengths of transmitted signals. Consequently, an antenna assembly which requires a smaller housing space can be obtained.
摘要:
An antenna coupling apparatus, an external-antenna connecting apparatus, and an onboard external-antenna connecting apparatus which inhibits unnecessary power emissions, reduces transmission loss, and offers high durability and high ease of operation. has an electromagnetic coupling element consisting of a conductor that is not in contact with a first antenna with respect to DC components and a ground conductor element consisting of a conductor that is not in contact with the first antenna with respect to DC components and in contact with a ground conductor with respect to DC components and reflecting the power transmitted or received by the first antenna toward the electromagnetic coupling element. An external-antenna connecting apparatus and an onboard external-antenna connecting apparatus have an electromagnetic coupling circuit in their bodies that electromagnetically couples the antenna of a portable radio terminal and an external antenna, with the external-antenna connecting apparatus and the onboard external-antenna connecting apparatus, being not in contact with the portable radio terminal with respect to DC components, when the portable radio terminal is secured in the bodies.
摘要:
An antenna coupling apparatus, an external-antenna connecting apparatus, and an onboard external-antenna connecting apparatus which inhibits unnecessary power emissions, reduces transmission loss, and offers high durability and high ease of operation, has an electromagnetic coupling element consisting of a conductor that is not in contact with a first antenna with respect to DC components and a ground conductor element consisting of a conductor that is not in contact with the first antenna with respect to DC components and in contact with a ground conductor with respect to DC components and reflecting the power transmitted or received by the first antenna toward the electromagnetic coupling element. An external-antenna connecting apparatus and an onboard external-antenna connecting apparatus have an electromagnetic coupling circuit in their bodies that electromagnetically couples the antenna of a portable radio terminal and an external antenna, with the external-antenna connecting apparatus and the onboard external-antenna connecting apparatus, being not in contact with the portable radio terminal with respect to DC components, when the portable radio terminal is secured in the bodies.
摘要:
An antenna unit in which fine antenna characteristic can be obtained when the antenna is contained/pulled out. When the second antenna (9) is contained, the second antenna is electrically disconnected from the feeding circuits (5, 7) by the antenna cover (13), so that only the first antenna (8) operates as antenna. On the other hand, when the second antenna is pulled out, the first antenna is compressed by the antenna stopper element (21) and the electrical length is varied, so that only the second antenna operates as antenna. As a result, fine antenna characteristic can be obtained when the antenna is contained/pulled out.
摘要:
A portable radio receiver for diversity reception in which electrical waves having different planes of polarization are received and synthesized at the receiving side using plural antennas. The radio receiver includes a metal casing, an external antenna mounted on one of the surfaces of the metal casing, and a single-side shorted microstrip antenna mounted on a surface of the metal casing so that its shorted surface is at right angles to the main polarization of the external antenna. In this manner, stable directivity and polarization diversity may be achieved in which the main polarization of the external antenna differs from that of the internal antenna and radiation patters are also different between the external antenna and the internal antenna.
摘要:
An antenna apparatus for use in a portable cellular telephone that can avoid deterioration in signal radiation characteristics caused by the adverse influence of a user's head during the use of the telephone. Two sleeves have been fixed to a housing for a portable cellular telephone. A linear radiating conductor having a .lambda./4-electrical length is slidably supported by the housing by way of the two sleeves so that it can be both freely pulled out of or accommodated in the housing. The radiating conductor is extended at one end on the side of the power-feed point by a length equivalent to n.lambda./2. Also, a tubular conductor is coaxially disposed with the extended portion so as to form a power-feed coaxial line. When the radiating conductor is pulled out of the housing to such a degree as to reveal the coaxial line, the monopole antenna projects sufficiently away from a user's head, and a deterioration in signal radiation characteristics can thus be prevented.
摘要:
A portable telephone having an antenna for transmitting and/or receiving a wireless signal, a microphone for generating a sound signal corresponding to an input sound, a transmitting and receiving circuit for generating a wireless signal corresponding to the sound signal generated by the microphone to transmit the wireless signal through the antenna and generating a sound signal corresponding to the wireless signal received by the antenna, a receiver for outputting sound corresponding to the sound signal generated by the transmitting and receiving circuit, a shield case for surrounding and housing all or part of the transmitting and receiving circuit and being conductive, an electric wave absorber with one face in contact with a predetermined area of the shield case for absorbing an electric wave, and a conductive layer formed on another face of the electric wave absorber and electrically connected to the shield case.
摘要:
An antenna that functions as an approximately balanced antenna that is structurally asymmetric but electrically symmetric includes a first antenna element that is extendable and retractable, a second fixed antenna element, an unbalanced transmission line feeding the first and second antenna elements, and a balanced-unbalanced convertor. At a time of extending the first antenna element, the first and second antenna elements are supplied an electric power from the unbalanced transmission line through the balanced-unbalanced convertor, so that the first and second antenna elements cooperate to function as an antenna.
摘要:
An antenna element including a feeding part and a mesh part including at least a part of an area formed in a mesh state. The feeding part and an area of the antenna element in close proximity to the mesh part are formed of a finer mesh than the mesh part or formed of a solid.
摘要:
In an antenna device and its assembly method as well as a wireless communication terminal and its assembly method, an antenna element is held in an antenna holding member. A circuit board formed with an electrode to supply power to the antenna element is held on a board holding member. The antenna element and the electrode of the circuit board are electrically connected each other by means of a connection member having elasticity by fixing the antenna holding member on the board holding member. This enables the antenna holding member to be fixed on the board holding member easily because the antenna element is held in the antenna holding member in advance, and concurrently the antenna element can be electrically connected to the electrode of the circuit board by means of the connection member by merely fixing the antenna holding member on the board holding member, thus markedly enhancing the assembly of the antenna devices and wireless communication terminal units.