摘要:
A housing antenna is small enough in size so as to be accommodated in a mobile device. The antenna has a number of feeding points that allow the antenna to operate as a number of antenna elements. The antenna is capable of realizing high speed communication by increasing communication capacity.
摘要:
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.
摘要:
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.
摘要:
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.
摘要:
A housing antenna is small enough in size so as to be accommodated in a mobile device. The antenna has a number of feeding points that allow the antenna to operate as a number of antennal elements. The antenna is capable of realizing high-speed communication by increasing communication capacity.
摘要:
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.
摘要:
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 an upper housing of a flip-type telephone. The ground conductor section 9 is a ground plane of a lower housing of the flip-type telephone. A ¼ wavelength one-end-short-circuited patch antenna 30 includes the first conductor section 7, a second conductor section 8, a short-circuit conductor section 10, and a second power supply section 3. The first power supply section 2 is a power supply section of the housing antenna 20. The second power supply section 3 is a power supply section of the ¼ wavelength one-end-short-circuited patch antenna 30. The first and the second power supply sections 2 and 3 are connected to a wireless communication circuit 4, thereby enabling wireless communication.
摘要:
An antenna apparatus is provided with two feed ports respectively provided at positions on an antenna element, and the antenna element is simultaneously excited through the two feed ports so as to simultaneously operate as two antenna portions respectively associated with the two feed ports. The antenna apparatus is further provided with a slit provided between the two feed ports, for changing a resonant frequency of the antenna element and producing isolation between the feed ports at a isolation frequency, and provided with matching means for shifting an operating frequency of the antenna element from the changed resonant frequency to the isolation frequency.
摘要:
An antenna apparatus includes a first feeding point and a second feeding point provided at respective positions on an antenna element. The antenna element is excited through the first and second feeding points simultaneously so as to operate as a first antenna portion and a second antenna portion simultaneously, the first antenna portion and the second antenna portion correspond to the first and second feeding points, respectively. The antenna element further includes, between the first and second feeding points, an electromagnetic coupling adjuster for making an amount of isolation between the first and second antenna portions.
摘要:
A MIMO antenna apparatus is provided with: an upper housing having slits; first feed points through which the upper housing itself is excited as first antennas; second feed points through which the slits are excited as second antennas; switch circuits, each of which is connected to one of the first feed points and one of the second feed points, and connects one of the two feed points to an A/D converter circuit-; a signal level detector circuit detecting signal levels of received radio signals; and a controller that controls the switches to change a feed point connected to the A/D converter circuit, when the detected signal level is less than or equal to a predetermined threshold value. The slits are located between the first antennas.