Abstract:
An antenna device for a portable radio communication device operable in at least a first and a second frequency band, includes first and second electrically conductive planar radiating elements. The first radiating element has a feeding portion connectable to a feed device of the portable radio communication device. The second radiating element includes a grounding portion connectable to ground. A controllable switch is arranged between the first and second radiating elements for selectively interconnecting and disconnecting the radiating elements. The state of the switch is controlled by means of a control voltage input. A first filter is arranged between the feeding portion and the control voltage input, to block radio frequency signals. By providing a high pass filter between the first and second radiating elements above a ground plane, quad-band operation is provided with high efficiency in a physically small antenna device.
Abstract:
PROBLEM TO BE SOLVED: To provide an antenna that has a constant beam width, that is fixed in directivity and has small cross polarization. SOLUTION: The antenna includes a plurality of electrical dipoles (1) and is capable of transmitting/receiving electromagnetic waves. The plurality of dipoles are disposed as a plurality of pairs, each including dipoles that extend opposite to each other; two dipoles of each pair perform radiation or reception with approximately the same amplitude and substantially the same phase; and at least some of the plurality of dipole pairs have characteristics that differ from each other and preferably, have dimensions or orientations that differ from each other, and the plurality of dipole pairs are disposed, in such a way that the geometrical centers of the dipole pairs substantially coincide with each other. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a chip antenna for terrestrial DMB (Digital Multimedia Broadcasting). SOLUTION: The chip antenna is characterized to include a main antenna element (200) in which two or more unit lamination structures (LYn) of a conductivity pattern with a meander line structure to a Z-axis direction of a XZ plane, are arranged to a Y axis direction in a dielectric block (100) in which two or more dielectric layers with a XY plane are laminated to the Z-axis direction, laminated structures (An) connected by the meander line structure to the Y-axis direction with the respective adjoining unit lamination structures, are formed, two or more above-mentioned lamination structures (An) are arranged to a X-axis direction, and connected with the respective adjoining lamination structures by the meander structure in the X-axis direction; and an auxiliary antenna (300) which is formed in an upper side or a lower side of the dielectric layer of the main antenna element (200) in a T character shape, connected with an end part of the main antenna element (200) through a conductive via hole, breaks up current distribution of the main antenna element (200), and expands the bandwidth. COPYRIGHT: (C)2006,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To provide a method of tuning an LC resonator which is simple and miniaturized, and an electrical apparatus having the integrated circuit and this LC resonator. SOLUTION: A variable capacitance C T is connected in parallel with the LC resonator 2 to perform the tuning of the LC resonator 2 having a micro antenna coil L A . When the device is produced, a maximum resonant frequency of the LC resonator 2 is measured after the variable capacitance C T is adjusted to a minimum value, the minimum resonant frequency of the LC resonator 2 is measured after the variable capacitance C T is adjusted to a maximum value, coded values of the measured maximum and minimum resonant frequency are stored in a non-volatile memory F max and F min , a binary tuning code B of an objective resonant frequency f t is calculated by a linear interpolation between the maximum and the minimum stored value, the LC resonator 2 is tuned to the objective resonant frequency f t by connecting individual capacitors of the variable capacitance C T in parallel with the LC resonator 2 which are weighted in binary according to a value of the binary tuning code B. COPYRIGHT: (C)2004,JPO&NCIPI