Abstract: An antenna unit and a communication apparatus are provided, which are operable with respect to wireless systems having three, or more frequencies by employing 2 sets of antenna elements, and which can realize such an antenna structure having a high freedom degree, while the antenna structure can be applied to frequency arrangements as to the plurality of wireless systems.

Abstract: A housing antenna 20 includes a first conductor section 7, a ground conductor section 9, and a first power supply section 2. The first conductor section 7 is a ground plane of the upper casing of a flip-type telephone. The ground conductor section 9 is a ground plane of the lower housing of the flip type telephone. The half-wavelength slot antenna 30 includes a first conductor section 7, a second conductor section 8, three short-circuit conductor sections 10-12, and a second power supply section 3. The first power supply section 2 is a power supply section for the housing antenna 20. The second power supply section 3 is a power supply section for the half-wavelength slot antenna 30. The first and the second power supply sections 2 and 3 are connected to a wireless communication circuit 4 and allow a wireless communication.

Abstract: The objective of the present invention is to provide a connection cable that serves as an external antenna for a radio apparatus, and whose antenna performance is not deteriorated in the use state by an adverse affect attributable to the near proximity of a human body.

Abstract: Provided is an antenna device which is small and low in height to be easily mounted on a small radio and forms a main beam, which has excellent radiation pattern frequency characteristics and is tilted in the horizontal direction. Slot elements (103a, 103b) of an antenna (101) are excited with a phase difference (d). A reflection plate (105) is provided with a plurality of patch elements (107) having a resonance frequency higher than the center frequency of the antenna (101), and a plurality of patch elements (108) having a resonance frequency lower than the center frequency of the antenna (101) around the patch elements (107).

Abstract: Provided is an antenna which has a small-sized planar constitution as can be easily mounted on a small-sized radio device and which can form a principal beam having a vertical polarization in directions of low and high elevation angles. On the surface of a substrate 11, slot elements 13A and 13B having a length of about one half wavelength are arranged in parallel at a predetermined distance d1, and a reflecting plate 14 is arranged at a predetermined distance h from the mounting face of the slot elements 13A and 13B. On the back of the substrate 11, parasitic elements 15A to 15D are made of a copper foil pattern and are arrayed to intersect the slot elements 13A and 13B at right angles. A switching element 16A is connected with the parasitic elements 15A and 15B, and a switching element 16B is connected with the parasitic elements 15C and 15D.

Abstract: A portable wireless apparatus has an antenna capable of resonating in frequency bands of various communication systems. The portable wireless apparatus comprises an upper case 5; a lower case 4 pivotably connected to the upper case 5; a circuit board 1 formed with wireless circuits 14 to 18 and a grounded planar conductor electrically connected to one ends of the wireless circuits 14 to 18; a planar conductor 2 provided in the upper case 5 and having a feed section electrically connected to the other ends of the wireless circuits 14 to 18; and a conductive element 3 provided in the upper case 5 and spaced from the planar conductor 2, the conductive element 3 having a length different from the length of the planar conductor 2 wherein the planar conductor 2 and the grounded planar conductor function as a dipole antenna, and the conductive element 3 functions as a parasitic element electromagnetically coupled with the dipole antenna.

Abstract: A polarization switching antenna device capable of switching a polarization without increase of an antenna installing space and also handling a variety of frequency bands is provided. A connection state of one end of a loop antenna element arranged on a side surface of a case is switched. Thus, the polarization characteristic is switched by switching selectively whether the antenna element should constitute a loop antenna or a linear antenna. Matching circuits suitable for respective characteristics are provided. The loop antenna can be fed in terms of a balanced feeding. A balanced feeding and an unbalanced feeding can be switched.

Abstract: A multi-band antenna can be realized by using a common antenna element with a simple configuration.

Abstract: An antenna apparatus includes an antenna element having at least one slit, a first feeding point provided at a position on the antenna element, and a second feeding point provided along the slit. The antenna element is excited as an electric current antenna through the first feeding point, and at the same time, the slit is excited as a magnetic current antenna through the second feeding point.

Abstract: In the adaptive control apparatus, a computation unit computes weighting coefficients, using a first adaptive control method in a proportion ? of a first computation amount, where the first adaptive control method has a first convergence rate and a first convergence error. Further, a computation unit computes weighting coefficients from initial values of the weighting coefficients computed by the computation unit, using a second adaptive control method in a proportion (1??) of a second computation amount, where the second adaptive control method has a second convergence rate slower than the first convergence rate and a second convergence error smaller than the first convergence error. A controller controls determination of a ratio ?/(1-?) based on a moving speed of a mobile unit, and controls the computation units to perform computing processes.

Abstract: Herein disclosed is a portable wireless device comprising a first monopole antenna section 11 having a length substantially equal to ¾ of a wavelength of a first frequency band, an open sleeve section 12 having a length substantially equal to ¼ of a wavelength of the first frequency band, the open sleeve section 12 being arranged under the condition that the first monopole antenna section 11 and the open sleeve section 12 are parallel to each other, and perpendicular to a line extending through one end of the first monopole antenna section 11 and one end of the open sleeve section 12, a feeding section 13 for feeding a radio frequency signal to the first monopole antenna section 11 and the open sleeve section 12 at the same time, a grounded base plate 14 made of conductive material, and a wireless circuit 15 arranged on the grounded base plate 14. The portable wireless device is useful for an ultra wideband system, and able to reduce the influence from the operator.

Abstract: A controller of a MIMO antenna apparatus calculates a current transmission capacity based on signal levels detected by a signal level detector circuit. The controller calculates an estimated transmission capacity assuming that at least one of antenna elements currently connected to a MIMO modulator and demodulator circuit is changed to a further antenna element not connected to the MIMO modulator and demodulator circuit, based on the detected signal levels and degrees of electromagnetic coupling stored in a degree-of-coupling memory. The controller controls a switch circuit to connect the further antenna element to the MIMO modulator and demodulator circuit when the current transmission capacity becomes lower than the estimated transmission capacity.

Abstract: A portable wireless device in which, in various states where the user uses the portable wireless device, the correlation coefficient between antennas can be reduced, and high-speed and high-capacity communication can be ensured is provided. In a portable wireless device 10, from the upper end of a case on the side opposed to a side of a display portion 37 of a case 11, a first antenna element 12 which is slightly shorter by 0.05 wavelengths than the half wavelength is placed, and a second antenna element 13 in which the element length is slightly shorter by 0.05 wavelengths than the half wavelength is placed at a predetermined gap in the width direction in parallel to the first antenna element 12. The first antenna element 12 is connected to a first shared transmitting/receiving unit 23, and the second antenna element 13 is connected to a second shared transmitting/receiving unit 24.

Abstract: A portable wireless device is capable of maintaining performance of an antenna without being affected by the state of the housing fitted with the antenna even if the housing is rotated around a rotation axis thereof by a predetermined angle. A portable wireless device 10 comprises an upper casing 21 provided with a balanced antenna 43 and a facing section 22a to be faced with the upper casing 21. The portable wireless device has two states including a first facing state in which the housing is in face to face relationship with the facing section and a second facing state in which the housing rotated around a rotation axis thereof by a predetermined angle is in face to face relationship with the facing section. The balanced antenna 43 has a shape symmetrical about a rotation axis 23b that is a rotation axis of the upper casing.

Abstract: A conductive metal frame attached to an upper case is electrically connected to hinge metal member. The hinge metal member is connected to a hinge metal member by a rotary shaft in a rotatable manner. The hinge metal member, a further hinge metal member, and the rotary shaft are made of conductive metal so that electric continuity is obtained at contact points thereamong. The further hinge metal member is connected to a matching circuit on a circuit board via a feedpoint terminal. A conductor element is connected to a ground pattern of the circuit board at a position close to a point at which the matching circuit is grounded. The structure as described above provides a folding portable wireless unit that can secure a high antenna performance in a calling state and a waiting state.

Abstract: A portable wireless apparatus has an antenna capable of resonating in frequency bands of various communication systems. The portable wireless apparatus comprises an upper case 5; a lower case 4 pivotably connected to the upper case 5; a circuit board 1 formed with wireless circuits 14 to 18 and a grounded planar conductor electrically connected to one ends of the wireless circuits 14 to 18; a planar conductor 2 provided in the upper case 5 and having a feed section electrically connected to the other ends of the wireless circuits 14 to 18; and a conductive element 3 provided in the upper case 5 and spaced from the planar conductor 2, the conductive element 3 having a length different from the length of the planar conductor 2 wherein the planar conductor 2 and the grounded planar conductor function as a dipole antenna, and the conductive element 3 functions as a parasitic element electromagnetically coupled with the dipole antenna.

Abstract: An adaptive antenna apparatus including a reception adaptive control circuit is provided. The reception adaptive control circuit adaptively controls respective received signals received by a plurality of antenna elements, and outputs the adaptively-controlled received signals as a combined received signal. A demodulator demodulates the combined received signal to a demodulated signal, and demodulates the respective received signals separately received by the respective antenna elements to demodulated signals. A controller compares signal quality of the demodulated signal of the combined received signal with signal qualities of the demodulated signals of the respective received signals separately received by the respective antenna elements, respectively, selects a demodulated signal having the highest signal quality, and controls to receive a received signal including a selected demodulated signal.

Abstract: The objective of the present invention is to provide a connection cable that serves as an external antenna for a radio apparatus, and whose antenna performance is not deteriorated in the use state by an adverse affect attributable to the near proximity of a human body.

Abstract: A portable wireless device realizing high-speed transmission in downlink communication in a used state that a foldable portable wireless device is held in a hand of the user and ensuring a high antenna radiation efficiency. In the portable wireless device, platy conductors (1, 3, 4) are arranged in the longitudinal direction on the back of a display section (35) of an upper case (5). The signal of a transmission circuit (25) is distributed by a power distributor (18). One signal is fed to a platy conductor (1) through a phase shifter (17) and the other is fed to the platy conductor (3) or the platy conductor (4) from a high-frequency switch (19) through a transmission/reception duplexer (20) or a transmission/reception duplexer (21). The high-frequency switch (19) selectively feeds power to either the platy conductor (3) or the platy conductor (4) according to the signal from a gravity sensor (26).

Abstract: An adaptive antenna apparatus includes antenna elements. One of the antenna elements has an electrical length L1 larger than ?/2, and equal to or smaller than a predetermined upper-limit wavelength, where ? is a wavelength of a radio signal. Another antenna element has an electrical length L2 equal to or larger than a predetermined lower-limit wavelength and equal to or smaller than ?/2. A controller adaptive-controls the adaptive antenna apparatus to form a radiation pattern of the adaptive antenna apparatus including a plurality of nulls substantively in a direction of an interference wave by adjusting at least one of an amplitude and a phase of each radio signal received by the first and second antenna elements.