Abstract: An antenna device includes: a feeding point that excites a high-frequency signal; a first conductor having a first end serving as a first open end and extending from the feeding point to the first open end; and a second conductor having a first end serving as a second open end and extending spirally between the feeding point and the second open end in a direction different from a direction directed from the feeding point to the first open end.

Abstract: The present invention provides an antenna device including a ground conductor plate 1 having a first circular hole 6, a disc-shaped conductor plate 5 which has a second circular hole 7 whose center is disposed on a straight line passing through a center of the first hole 6 and orthogonal to the ground conductor plate 1, has a center that coincides with the center of the second hole 7, and is disposed substantially parallel to the ground conductor plate 1, a first linear conductor 4 having a first end passing through the first hole and a second end passing through the second hole, a second linear conductor 3 having a first end connected to the second end of the first conductor and disposed substantially parallel to the ground conductor plate, and an antenna element 2 connected to a second end of the second conductor.

Abstract: The present invention provides an antenna device including a ground conductor plate 1 having a first circular hole 6, a disc-shaped conductor plate 5 which has a second circular hole 7 whose center is disposed on a straight line passing through a center of the first hole 6 and orthogonal to the ground conductor plate 1, has a center that coincides with the center of the second hole 7, and is disposed substantially parallel to the ground conductor plate 1, a first linear conductor 4 having a first end passing through the first hole and a second end passing through the second hole, a second linear conductor 3 having a first end connected to the second end of the first conductor and disposed substantially parallel to the ground conductor plate, and an antenna element 2 connected to a second end of the second conductor.

Abstract: On the basis of monitoring information acquired by a monitoring device (4), a control device (6) determines a capacity and a position of a net (3), a winding device (2) adjusts the capacity of the net (3) to the capacity determined by the control device (6), and an underwater moving device (5) moves the net (3) to the position determined by the control device (6).

Abstract: It is provided with: a variable decoupling circuit (10) connected to a first input/output port (1) and a third input/output port (3), which reduces coupling between the first input/output port (1) and the third input/output port (3); and a coupling measurement circuit (20) that measures a coupled amplitude and a coupled phase between a second input/output port and a fourth input/output port from a signal output from the variable decoupling circuit (10) to the second input/output port when a signal is input from the first input/output port (1) and a signal output from the fourth input/output port to the variable decoupling circuit (10) when a signal is input from the fourth input/output port, in which a controller (30) controls the variable decoupling circuit (10) in accordance with the coupled amplitude and the coupled phase measured by the coupling measurement circuit (20) such that a coupled amplitude between the first input/output port (1) and the third input/output port (3) becomes zero.

Abstract: The present invention is characterized by an antenna device including: a circuit board; a circuit pattern formed by a conductor on a surface of the circuit board; and a minute loop antenna mounted on the circuit board and formed in a loop shape by a conductor having two end portions, wherein the circuit pattern includes at least a feeder circuit configured to supply power to the minute loop antenna, and a ground, and the minute loop antenna is mounted on the circuit board such that: the conductor having the two end portions is connected at one end thereof to the feeder circuit and connected at another end thereof to the ground; a loop surface of the conductor having the two end portions is perpendicular to a plane on which the circuit pattern is formed; and a normal line passing through the loop surface does not pass through the circuit pattern.

Abstract: The present invention is characterized by an antenna device including: a circuit board; a circuit pattern formed by a conductor on a surface of the circuit board; and a minute loop antenna mounted on the circuit board and formed in a loop shape by a conductor having two end portions, wherein the circuit pattern includes at least a feeder circuit configured to supply power to the minute loop antenna, and a ground, and the minute loop antenna is mounted on the circuit board such that: the conductor having the two end portions is connected at one end thereof to the feeder circuit and connected at another end thereof to the ground; a loop surface of the conductor having the two end portions is perpendicular to a plane on which the circuit pattern is formed; and a normal line passing through the loop surface does not pass through the circuit pattern.

Abstract: An environmental information measurement device includes: a power source unit; an environmental information detector; a timer; and a controller. The power source unit generates, from an electromagnetic wave received, a power source voltage to be supplied to a load. The load includes the environmental information detector, the timer, and the controller. The environmental information detector includes a detector including a circuit element having an impedance or an electrostatic capacitance that varies according to a physical amount detected under an environment at a measurement target point, and outputs a signal that varies according to a response characteristic of the detector. The timer measures a duration from the time when measurement is initiated to the time when a voltage of the signal becomes a predetermined detection voltage. The controller controls an operation of the environmental information detector.