Electronics and Telecommunications Research Institute

Chang Soo Kwak

In Bok Yom

Hong Yeol Lee

Man Seok Uhm

So Hyeun Yun

Ho Jin Lee

Youn Sub Noh

Jang Sup Choi

A method of tuning a golden filter used to initially tune a microwave filter using an apparatus for tuning the golden filter may comprise: fixing the golden filter with a plurality of filter fixing bolts and nuts; bringing a plurality of height adjusting screws into contact with tuning screws of the fixed golden filter; fixing the plurality of height adjusting screws with height adjusting screw nuts; and removing the plurality of filter fixing bolts and nuts and moving the golden filter.

Method and apparatus for tuning golden filter

A tunable filter device that changes a central frequency and a bandwidth is provided. The tunable filter device may include a body forming a cavity together with a cover, a resonator attached to or integrally formed on a lower surface of the cavity, a frequency-tuning element including a head and a shaft, the shaft passed through the cover and inserted in the resonator, and a cam disposed on the head to contact the head, wherein an insertion length of the shaft is controlled by the cam.

Variable high frequency filter device and assembly

The present invention relates to a dual reflector antenna with a hybrid subreflector, and more particularly, to a dual reflector antenna with a subreflector having a structure in which an ellipse and a hyperbola are combined. An exemplary embodiment of the present invention provides a dual reflector antenna including: a main reflector; and a hybrid subreflector which faces the main reflector and has a first structure and a second structure which are combined therein.

Dual reflector antenna with hybrid subreflector

Provided is an antenna apparatus which employs a small number of antenna devices and is intended to obtain a desired pattern without adjusting amplitude level and phase of each antenna device. The antenna apparatus includes a first ridge horn antenna, and a second ridge horn antenna spaced apart from the first ridge horn antenna by a determined distance. Here, a multi-beam pattern is generated using a third-order mode beam pattern of a synthetic beam obtained by synthesizing beams respectively radiated from the first and second ridge horn antennas. Accordingly, the antenna apparatus can be simplified, and a desired multi-beam pattern can be obtained without adjusting signal level and phase of each antenna device. Also, by employing the ridge horn antennas as array devices, the antenna apparatus can be used in a wide frequency band.

Antenna apparatus

A heat exhaustion structure for a heat dissipating device is provided. The present invention relates to a heat exhaustion structure for a heat dissipating device, and more particularly, to a heat exhaustion structure that may effectively exhaust an internal heat generated by heat dissipating devices included in a semiconductor package and in a large number of electronic products.

Heat exhaustion structure for heat dissipating device

The present invention relates to an antenna system mounted on a mobile vehicle. In the present invention, a power distributor and a part of a high-frequency module that includes a frequency converter are placed in an external fixed unit that is placed outside a radome. In addition, an active cooler/cooling fin, a heater, and an air circulation fan are placed at an internal bottom plane of the antenna system, and a cooling fin and cooling fan are placed at an external bottom plane of the antenna system.

Growing community of inventors

Daejeon, South Korea

Chang Soo Kwak