Abstract: A wireless device includes: a first communicator having a first antenna and a first wireless circuit group including a first wireless circuit connected to the first antenna and communicating using a first band; a first demultiplexer connecting the first antenna and the first wireless circuit; a second communicator having a second antenna and a second wireless circuit group including a second wireless circuit connected to the second antenna and communicating using the first band; a second demultiplexer connecting the second antenna and the second wireless circuit group; a first signal line connecting between the second antenna and the second demultiplexer and between the second demultiplexer and the second wireless circuit; and a first switch switching between a mode of connecting the second antenna and the second wireless circuit through the second demultiplexer and a mode of connecting the second antenna and the second wireless circuit through the first signal line.

Abstract: The present invention provides a radio communication device (100) in which two antennas is arranged in the same location. The radio communication device (100) includes a first antenna (4) and a second antenna (7). A second conductor element (8) of the second antenna is configured to overlap with a first conductor element (5) of the first antenna. The second antenna is configured to employ, as a second ground plate (9), the first conductor element of the first antenna. A wiring section (10) of the second antenna is configured to pass through a path that overlaps with a short-circuit section (S) of the first antenna.

Abstract: An antenna includes a first antenna element, a second antenna element, and a third antenna element. The second antenna element is placed between the first antenna element and the third antenna element. A first connecting end, a second connecting end, and a third connecting end are each placed in a position that is closer to a third apical end than to a first apical end. Thus, even in the case of an antenna including three antenna element that are used for an identical system, the antenna can be provided with a suppressed difference in radiation efficiency among frequency bands to which the antenna elements respectively correspond.

Abstract: At least three resonance frequencies are obtained by two antenna elements. The antenna device includes antenna elements (11) and (12), a wireless section (20) for supplying power to each of the antenna elements (11) and (12), a PIN diode (16) for electrically connecting and disconnecting the antenna element (11) and the wireless section (20) with/from each other, the antenna elements (11) and (12) being provided so as to be capacitively coupled to each other during the electrical disconnection between the antenna element (11) and the wireless section (20) which electrical disconnection is made by the PIN diode (16).

Abstract: An antenna includes a first antenna element, a second antenna element, and a third antenna element. The second antenna element is placed between the first antenna element and the third antenna element. A first connecting end, a second connecting end, and a third connecting end are each placed in a position that is closer to a third apical end than to a first apical end. Thus, even in the case of an antenna including three antenna element that are used for an identical system, the antenna can be provided with a suppressed difference in radiation efficiency among frequency bands to which the antenna elements respectively correspond.

Abstract: An antenna assembly (110) includes an antenna base (115) and antenna elements (111 to 113) formed on a surface of the antenna base (115). The antenna base (115) has: a connection surface (115b) on which connecting ends (111b to 113b) of the antenna elements (111 to 113) are formed, the connecting ends (111b to 113b) being connected to the wireless section circuit; and a through hole (106) formed through the antenna base (115) from the connection surface (115b) to another surface (115a). At least one of the antenna elements, for example, an antenna element (112) is configured so as to pass through the through hole (106).

Abstract: At least three resonance frequencies are obtained by two antenna elements. The antenna device includes antenna elements (11) and (12), a wireless section (20) for supplying power to each of the antenna elements (11) and (12), a PIN diode (16) for electrically connecting and disconnecting the antenna element (11) and the wireless section (20) with/from each other, the antenna elements (11) and (12) being provided so as to be capacitively coupled to each other during the electrical disconnection between the antenna element (11) and the wireless section (20) which electrical disconnection is made by the PIN diode (16).

Abstract: An antenna apparatus includes a tabular ground conductor, a radiation conductor facing the ground conductor, a short-circuit portion for short-circuiting the ground conductor and the radiation conductor, an opening disposed on the ground conductor where the location is positioned at a distance of d from the short-circuit portion in the in-plane direction of the tabular ground conductor, and a feed portion extending from the radiation conductor and passing through the opening in a noncontact manner regarding the ground conductor. The feed portion is connected to a matching circuit. The distance d between the short-circuit portion and the feed portion is the length such that the antenna is not resonant at a frequency used for communication, and the matching circuit performs adjustments such that the antenna is constrained to resonate in one or more communication frequency bands.

Abstract: An object of the invention is to reduce changes of antenna characteristics due to circumstances or usage forms and to obtain good characteristics in any conditions. An antenna apparatus A comprise a tabular ground conductor 1, a radiation conductor 3 disposed in a location facing the ground conductor 1, a short-circuit portion 7 for short-circuiting the ground conductor 1 and the radiation conductor 3, an opening 11 disposed on the ground conductor 1 where the location is positioned at a distance of d from the short-circuit portion 7 in the in-plane direction of the tabular ground conductor 1, and a feed portion 5 extending from the radiation conductor 3 and passing through the opening 11 in a noncontact manner regarding the ground conductor 1. These members are disposed in the vicinity of the lower end of a casing. The feed portion 5 is connected to a matching circuit shown in FIG. 2.