Abstract:
An antenna apparatus includes first and second antenna elements. The first antenna element operates as a loop antenna that resonates at a first wavelength, and the antenna apparatus operates as an inverted-F antenna that resonates at a second wavelength. The first antenna elements includes a first element portion formed to have a predetermined height from a surface of a dielectric substrate, and the second antenna element includes a second element portion which is formed to be substantially parallel to the first element portion at least at a predetermined distance apart from the first antenna element.
Abstract:
An antenna device includes: a first ground member; one or more first antennas which are connected to the first ground member and resonate in a first frequency band; a second ground member; one or more second antennas which are connected to the second ground member and resonate in a second frequency band; one or more first filters which connect the first and second ground members and attenuate a signal in the first frequency band; and one or more second filters which connect the first and second ground members at a position different from a position where the one or more first filters connect the first and second ground members and attenuate the signal in the first frequency band less than the one or more first filters.
Abstract:
Three-way divider includes first transmission line, second transmission line, and third transmission line. First transmission line includes first input-side line and first output-side line, which are connected at first connection point. Second transmission line includes second input-side line and second output-side line, which are connected at second connection point. Third transmission line includes third input-side line and third output-side line, which are connected at third connection point. Each of first transmission line, second transmission line, and third transmission line has an electrical length that is ¼ a wavelength of a second frequency. The first connection point and the second connection point, the third connection point and the second connection point, the first output terminal and the second output terminal, and the third output terminal and the second output terminal are respectively connected via corresponding resistors.