摘要:
An antenna apparatus 10 includes a chip antenna 14 provided with a conductor 11, a power-supply electrode 12 to which one end of the conductor 11 is connected, and a terminal electrode 13 to which the other end of the conductor is connected; and a mounting substrate 18 provided with a line-shaped radiative conductor 15 formed by printing an electrically conductive material on a surface, a line-shaped conductive pattern 16, and a substantially rectangular ground electrode 17. The chip antenna 14 is mounted on the mounting substrate 18. The power-supply electrode 12 of the chip antenna 14 is connected through the conductive pattern 16 on the mounting substrate 18 to a power-supply source V. The terminal electrode 13 of the chip antenna 14 is connected to one end of the radiative conductor 15 on the mounting substrate 18.
摘要:
The invention provides a mobile image apparatus (10), comprising: a case unit (11); at least one antenna (12) disposed at least one of within said case unit (11) and outside said case unit (11); wherein said chip antenna (12) comprises; a substrate (1) made of at least one of a dielectric material and a magnetic material; at least one conductor (2) disposed at least one of within said substrate (1) and on a surface of said substrate (1); at least one power feeding terminal (3) disposed on a surface of said substrate (1) and connected to one end of said conductor (2) for applying a voltage to said conductor (2).
摘要:
A portable telephone includes a portable telephone body made from plastic having a receiver, a transmitter, and dial keys, and a chip antenna which is mounted on a circuit board secured at the inside of the portable telephone body and which is electrically connected to an RF section provided on the circuit board in the portable telephone. The chip antenna is disposed near the transmitter at a location where a transmitted electromagnetic signal is unlikely to be affected by the body of a person who is holding the portable telephone.
摘要:
An antenna apparatus which exhibits excellent mechanical strength and which is protected from heat and moisture, and also which is mountable on a printed wiring board with the provision of a clearance between the apparatus and the board, free from deformation caused by a warp of the board. The antenna apparatus has a rectangular-prism shaped substrate. A feeding terminal and a fixing terminal are disposed at the respective end surfaces in the longitudinal direction of the substrate. Metal strips serving as support terminals are soldered at the respective first ends to the feeding terminal and the fixing terminal, respectively. A coating material formed of a non-metallic material, such as glass, resin or the like, is applied to the surface of the substrate by way of coating, dipping or other method. A coating layer is thus formed on the substrate in a state in which the respective second ends of the metal strips project from the substrate.
摘要:
A chip antenna in which correct evaluation and inspection of a conductor can be performed regardless of the state of grounding. The chip antenna has a rectangular-prism-shaped substrate formed of a dielectric material comprising, e.g., barium oxide, aluminum oxide and silica. A copper or copper-alloy conductor is spirally wound within the substrate in the longitudinal direction. A feeding terminal for applying a voltage to the conductor and a free terminal are disposed on the surfaces of the conductor. One end of the conductor is attached to the feeding terminal, while the other end is connected to the free terminal.
摘要:
The invention provides an antenna device, comprising: an antenna body including a conductor, an equivalent circuit of said conductor comprising an inductive component and a resistive component in a series connection, wherein a frequency adjusting circuit including at least a parallel circuit of a switching element and a passive element is connected to said conductor of said antenna body. The antenna body is connected in series with said frequency adjusting circuit.The invention enable to provide a compact antenna device for use in a mobile communication apparatus that performs transmission and reception on frequencies in a wide range.
摘要:
An antenna unit having a substrate and a radiator, including a metal plate, which is mounted on the substrate, the radiator being provided with a feed terminal, a ground terminal and an electrostatic capacitance connecting terminal extending toward the substrate, so that the radiator is fixed to the substrate through the feed terminal, the ground terminal and the electrostatic capacitance connecting terminal, and further a capacitance being connected between the capacitance connecting terminal and a ground potential.
摘要:
A matching circuit and an antenna apparatus which, though small-sized, can be used in a radio apparatus which transmits and receives radio waves having a wide range of frequencies. A matching circuit includes an inductance element formed of a chip inductor connected in series with an antenna body, a first capacitance element formed of a trimmer capacitor, and a second capacitance element formed of a chip capacitor, which capacitance elements are connected between respective ends of the inductance element and a ground terminal, and thus in parallel to the antenna body. One end of the inductance element is connected to the power supply terminal of the antenna body, and the other end is connected to a power source for applying a voltage to the antenna body. The first capacitance element is connected between a ground and the connection point of the power supply terminal of the antenna body and the inductance element. The second capacitance element is connected between a ground and the connection point of the inductance element and the power source.
摘要:
An antenna device, comprising an antenna unit including basic body comprising at least one of dielectric ceramic and magnetic ceramic, at least one conductor disposed at least one of inside and on a surface of the basic body, and a feeding electrode for applying a voltage to the conductor disposed on the surface of the basic body; a mounting board on which the antenna unit is mounted; a ground part in association with the mounting board and adapted to resonate with the antenna unit; and a length in the polarization direction of a radio wave of the ground part being about &lgr;/4 or more, where &lgr; is a wavelength of the radio wave, the basic body comprising a first generally planar sheet having a plurality of spaced, first conductors formed on one major surface thereof and a second generally planar sheet having a plurality of spaced second conductors formed on one major surface thereof; the first and second generally planar sheets being laminated together to form an elongated structure wherein respective pairs of the first and second conductors are coupled to one another to form respective spiral loops of a spiral antenna so that a central axis of the spiral antenna extends generally parallel to a longitudinal direction of the elongated structure; each of the sheets being formed of a material having a permeability of 1
摘要:
The present invention is directed to provide a compact chip antenna for mobile communication comprising a base member which comprises either of a material having a dielectric constant .epsilon. of 1