Yokowo Co., Ltd.

Adv Antest Corporation

Takao Kawahara

Ryo Horie

Wasuke Yanagisawa

Tomio Anbe

Takayuki Nakamura

Shozaburo Kameda

Katsuo Miki

Atsushi Sato

Yoshikazu Nakayama

Tadashi Oshiyama

Masato Haruta

Yasuhiro Minoura

Seiji Go

Katsutoshi Okubo

Seiji Gou

Yuichi Kagoshima

Takumi Yano

A first switch is arranged such that a first terminal thereof is connected to an AC test unit and a second terminal thereof is connected to an I/O terminal and a DC test unit. A first switch is configured so as to be capable of switching states between a connection state in which the first terminal and the second terminal are connected to each other, and a disconnection state in which they are disconnected from each other. A bypass capacitor is arranged between the first terminal and the second terminal, and is configured to bypass the frequency component which is cut off by the first switch.

Pin card

A DUT is connected to an I/O terminal. An AC test unit performs an AC test operation for the DUT. A DC test unit performs a DC test operation for the DUT. An optical semiconductor switch is arranged such that a first terminal thereof is connected to the AC test unit and a second terminal thereof is connected to the I/O terminal. The optical semiconductor switchis configured to be capable of switching states, according to control signals input to control terminals, between a connection state in which the first terminal and the second terminal are connected to each other, and a disconnection state in which they are disconnected from each other. A first impedance circuit is arranged on a signal line for the control signal to be input to the positive-electrode control terminal. Furthermore, a second impedance circuit is arranged on a signal line for the control signal to be input to the negative-electrode control terminal.

A reflection element determination device derives error factors in a first signal source and a second signal source based on measurement results of a signal in respective states in which reflection elements are respectively connected to the first signal source and the second signal source, and measurement results of a signal in a state in which the first signal source and the second signal source are connected with each other via a transmission element, derives transmission characteristics of the transmission element based on the measurement results of a signal in the state in which the first signal source and the second signal source are connected with each other via the transmission element and the derived error factors, and determines whether the reflection elements realize predetermined reflection states based on the derived transmission characteristics of the transmission element and transmission characteristics of the transmission element which have been known before the derivation, where the transmission characteristic of the transmission element in a direction from a first terminal to a second terminal, and the transmission characteristic of the transmission element in the opposite direction are equal to each other.

Device, method, and program for determining element, recording medium, and measurement device

An insulative member is formed with a hole. An antenna element is provided as a conductive foil adhered onto the insulative member and having a contact section opposing to the hole. A conductive member is fitted into the hole through the contact section of the antenna element, such that a part of the contact section is clamped between an outer face of the conductive member and an inner face of the hole.

Antenna structure

A whip antenna is movable between a first position corresponding to a state in which the whip antenna is extended from a casing of the mobile communication terminal, and a second position corresponding to a state the whip antenna is accommodated within the casing. A built-in antenna is disposed within the casing. A power feeding circuit is disposed within the casing. A first matching circuit has a first impedance, through which the power feeding circuit and the whip antenna are electrically connected when the whip antenna is placed at the first position. A second matching circuit has a second impedance which is higher than the first impedance, through which the whip antenna is grounded when the whip antenna is placed at the second position. A switch mechanism is opened so that the built-in antenna is electrically disconnected from the power feeding circuit when the whip antenna is placed at the first position, and closed so that the built-in antenna is electrically connected to the power feeding circuit.

Antenna device for mobile tele-communication terminal

An antenna for mounting on a vehicle which restrains damping of a signal voltage by reducing a stray capacitance of a signal path and has an improved antenna characteristic and a short physical length, and an antenna element which is suitable for an antenna for mounting on a vehicle and is flexible by using a helical coil of a large winding diameter are provided. In the antenna for mounting on a vehicle, with respect to a band signal having a short wavelength of a plurality of band signals to be transmitted/received, an antenna element is caused to resonate with a physical length shorter than &frac14; of the wavelength of the band signal. A linear line portion is provided at the proximal end, and the antenna element is provided at a predetermined distance from vehicle body and a conductive member of the same electric potential as the vehicle body. The stray capacitance between the proximal end portion of the antenna element and the vehicle body is small, and a signal voltage is outputted without being damped. The antenna element is formed by burying a helical coil coaxially into a flexible insulating resin pipe. The pitch of the helical coil is not shifted even when it is bent repeatedly. Also, no sink mark is generated in the insulating resin pipe.

Antenna for mounting on vehicle, antenna element and manufacturing method thereof

The invention being thus described, it will be obvious that the same may be varied in many ways. Such variations are not to be regarded as a departure from the spirit and scope of the invention, and all such modifications as would be obvious to one skilled in the art are intended to be included within the scope of the following claims.

Antenna for mounting on vehicle, antenna element and manufacturing method therefor

A motor-driven antenna device in which an antenna element (,) has a short protruding length so that the outer dimension of the entire device is reduced, and in which damping of an AM-band signal by a signal path is restrained with a small stray capacitance. A rack cord (,) to be meshed with a pinion gear (,) is connected to a proximal portion of the antenna element (,) made of a helical coil over its entire length, and the antenna element (,) is caused to protrude and move to be housed by rotational driving of a motor drive section. The rack cord (,), the motor drive section and the pinion gear (,) are housed in a case (,), and a guide (,) to which the rack cord (,) is abutted and moves while bending is provided in the case (,). Thus, the rack cord (,) is abutted and moves to the guide (,) by the movement of the antenna element (,). In a protruding state, a linear conductor (,) is extended from the proximal end of the antenna element (,) to penetrate an earth conductive fitting (,) and electrically connected with a connection conductive fitting (,) at a position not in contact with the earth conductive fitting (,). A feeder conductive fitting (,) elastically contacts and is electrically connected with the linear conductor (,).

Growing community of inventors

Tokyo, Japan

Takao Kawahara