Kddi Corporation

Denki Kogyo Company, Limited

Kabushikikaisha Watanabeseisakusyo

Onoda, Seiichi

Dkk Co., Ltd.

Kabusikikaisha Watanabeseisakusyo

Masayuki Nakano

Keisuke Sato

Seiichi Onoda

Yukitaka Takahashi

Keiichi Inoue

Hiromi Matsuno

Matsuno Hiromi

The apparatus automatically corrects deformation of directivity in a vertical plane caused by abnormality in transmission paths and receiving paths. The apparatus includes transmission system detection means (-to-) configured to individually detect abnormality occurring in each of the transmission paths, receiving system detection means (-to-) configured to individually detect abnormality occurring in each of the receiving paths, and control means () configured, if any abnormal transmission path has been detected by the transmission system detection means (-to-), to correct deformation of directivity of the transmission antenna in a vertical plane caused due to abnormality in the transmission path by changing and setting a phase and an amplitude of the transmission signal passing through a normal transmission path, and if any abnormal receiving path has been detected by the receiving system detection means (-to-), to correct deformation of directivity of the receiving antenna in a vertical plane caused due to abnormality in the receiving path by changing and setting a phase and an amplitude of the receiving signal passing through a normal receiving path.

Base station antenna apparatus for mobile communication system

To reduce coupling between transmission and reception while implementing sharing of polarized waves for both the transmitting band and the receiving band at the same time. Patch antenna for transmitting band and patch antenna for receiving band, which are arranged at predetermined spacing, include an upper-stage ground conductor; a lower-stage ground conductor; a feed line which is arranged among the ground conductor and the lower-stage ground conductor; a feed slot which is formed on the upper-stage ground conductor; a patch which is electromagnetically coupled with the feed line via the feed slot; and electromagnetic shielding members which are connected with the upper-stage ground conductor and the lower-stage ground conductor in a state in which the electromagnetic shielding members are located around the feed line. The feed line includes independent feeding conductors corresponding to respective polarized waves.

Transmitting-receiving-separated dual-polarization antenna

An optical fiber sensing system carries out accurate measurements while avoiding measurement noise factors. For example, effects of the emission power of a light source, fiber insertion loss, fluctuations in the sensitivity of a photo detector, fluctuations in the amplitude of an amplifier, the loss of optical energy due to bending of an optical fiber, the loss of optical energy due to connecting two or more optical fibers, and gain fluctuations of electric circuitry provided on a platform do not affect measurements. A reflective sensor is connected to an end of an optical fiber connected to a light source. The light source outputs physical measurement light and reflected light coming from the reflective sensor is separated into two beams of light. Information on the physical quantity of a measurement target object is detected on the basis of an intensity ratio of the two beams.

Optical fiber sensing system

Growing community of inventors

Saitama, Japan

Masayuki Nakano