Abstract: A multi-band antenna is adapted to operate in a first frequency band and a second frequency band which is lower than the first frequency band. In the multi-band antenna, an antenna element has an electrical length of ¾ wavelength of the first frequency band. The antenna element has a first end adapted to be electrically connected to a power feeding point, and a second end. An inductor is electrically connected between the second end of the antenna element and a ground in a serial manner. The inductor has such an inductance that an electrical length of the antenna element and the inductor corresponds to ½ wavelength of the second frequency band.

Abstract: The present invention provides an antenna for multiple bands employing a single antenna element 10, capable of operating in multiple frequency bands, and ideal for size reduction purposes. One end A of an antenna element 10 is electrically connected to a feeding point 12 and intermediate points B and C and the other end thereof is electrically connected via switches SWb, SWc, and SWd to a ground conductor 14. The electrical lengths of the antenna element 10 from the terminal to the intermediate points B and C plus connection lines from these points via the switches SWb and SWc to the ground conductor 14 and the electrical length from the one end A to the other end D plus a connection line from the other end via the switch SWd to the ground conductor 14 are set to be capable of resonating different desired frequency bands. By closing one of the switches SWb, SWc, and SWd, one of the desired frequencies can be selected and the antenna can resonate with that frequency.

Abstract: A multi-band antenna is adapted to operate in a first frequency band and a second frequency band which is higher than the first frequency band. A first antenna element is adapted to operate in the first frequency band, and has a first end which is electrically connected to the power feeding point and a second end which is electrically made open. A second antenna element is adapted to operate in the second frequency band, and has a third end which is electrically connected to the power feeding point and a fourth end which is electrically connected to the ground conductor. An electrical length of the first antenna element is set to ½ wavelength of the second frequency band, and an electrical length of the second antenna element is set to ¼ wavelength of the first frequency band.

Abstract: A multi-band antenna is adapted to operate in a first frequency band and a second frequency band which is lower than the first frequency band. In the multi-band antenna, an antenna element has an electrical length of ¾ wavelength of the first frequency band. The antenna element has a first end adapted to be electrically connected to a power feeding point, and a second end. An inductor is electrically connected between the second end of the antenna element and a ground in a serial manner. The inductor has such an inductance that an electrical length of the antenna element and the inductor corresponds to ½ wavelength of the second frequency band.

Abstract: The present invention provides an antenna for multiple bands employing a single antenna element 10, capable of operating in multiple frequency bands, and ideal for size reduction purposes. One end A of an antenna element 10 is electrically connected to a feeding point 12 and intermediate points B and C and the other end thereof is electrically connected via switches SWb, SWc, and SWd to a ground conductor 14. The electrical lengths of the antenna element 10 from the terminal to the intermediate points B and C plus connection lines from these points via the switches SWb and SWc to the ground conductor 14 and the electrical length from the one end A to the other end D plus a connection line from the other end via the switch SWd to the ground conductor 14 are set to be capable of resonating different desired frequency bands. By closing one of the switches SWb, SWc, and SWd, one of the desired frequencies can be selected and the antenna can resonate with that frequency.

Abstract: The present invention provides a broad-band antenna for mobile communication in which a desired antenna characteristic is obtained in plural frequency bands of a portable phone or the like. A metal plate 16 having a suitable shape is disposed on an upper surface of a carrier 14 provided on a circuit board 10, and a first and a second antenna elements functioning as inverted-F antennas respectively resonant at a first frequency band and a second frequency band higher than the former are formed by electrically connecting the metal plate 16 to a grounding plate 12 and the circuit board 10 by an earthing terminal 18 and a feed terminal 20, respectively. A third antenna element 24 having a base end electrically connected to the feed terminal 20 and resonant at a third frequency band higher than the second frequency band is provided on a side surface of the carrier 14, ends of the second antenna element and the third antenna element 24 are disposed to be spaced from each other by a distance of 0.

Abstract: The present invention provides a broad-band antenna for mobile communication in which a desired antenna characteristic is obtained in plural frequency bands of a portable phone or the like. A metal plate 16 having a suitable shape is disposed on an upper surface of a carrier 14 provided on a circuit board 10, and a first and a second antenna elements functioning as inverted-F antennas respectively resonant at a first frequency band and a second frequency band higher than the former are formed by electrically connecting the metal plate 16 to a grounding plate 12 and the circuit board 10 by an earthing terminal 18 and a feed terminal 20, respectively. A third antenna element 24 having a base end electrically connected to the feed terminal 20 and resonant at a third frequency band higher than the second frequency band is provided on a side surface of the carrier 14, ends of the second antenna element and the third antenna element 24 are disposed to be spaced from each other by a distance of 0.

Abstract: A conductor is provided from a base to a first fold point at the tip side, and sequentially folded parallel not less than once at the tip side and the base side, forming a first element; the conductor is split at the first fold point and the split conductor is, similarly, sequentially folded parallel not less than once at the tip side and the base side, forming a second element. Then, the effective length from the base to the tip of the first element is set to a quarter of the wavelength of a first frequency, and the effective length from the base to the tip of the second element is set to a quarter of the wavelength of a second frequency.

Abstract: A slide switch comprising a slidable knob having a slanting surface formed in its inside, a holder arranged to be moved by the slanting surface in the direction perpendicular to the sliding direction of the knob, an insulator plate disposed in the direction perpendicular to the moving direction of the holder and provided with fixed contacts on the holder side, a first elastic body disposed on the insulator plate and provided with an opening portion widely opened toward the insulator plate and with a movable contact on an inner surface opposite to the fixed contacts, and a second elastic body interposed between the holder and the first elastic body and having an elastic modulus larger than that of the first elastic body.