Ajou University Industry-Academic Cooperation Foundation

Korea Institute of Science and Technology

Yong Bae Park

Chang Seong Kim

Seok Won Hong

Hyung Jun An

Yong Su Choi

Jae Shik Chung

Gyo Bum Kim

Yun Chul Chung

The method for compensating a boresight error in a low earth orbit (LEO) satellite antenna according to the present disclosure comprising the steps of: converting a communication point of the LEO satellite and the location of the ground station into the geocentric coordinate system, and setting an incidence angle of the electromagnetic wave radiated from the antenna of the LEO satellite; calculating the measured meteorological condition as a meteorological condition at a specific altitude interval; calculating the meteorological conditions respectively as an effective refractive index; dividing the atmosphere into layers at specific altitude intervals, and calculating an arrival coordinate of the electromagnetic wave for which the atmospheric environment is considered; when the error between the location of the ground station and the arrival coordinate of the electromagnetic wave is less than a target error, deciding the compensating angle for the incidence angle of the electromagnetic wave.

Method for compensating boresight error in low earth orbit satellite antenna

Disclosed is a substrate-integrated waveguide slot antenna including a lower substrate having a substrate-integrated waveguide structure, the lower substrate being provided in the upper surface thereof with at least one slot, whereby an electromagnetic wave is guided by the substrate-integrated waveguide structure and is emitted through the slot, and an upper substrate formed on the lower substrate, the upper substrate having a metasurface configured such that a plurality of unit cells is arranged at predetermined intervals, whereby the electromagnetic wave dispatched through the slot is reemitted by the metasurface.

Substrate-integrated waveguide slot antenna with metasurface

Disclosed are apparatus and method for alternative aeration-effluent wastewater treatment using a ceramic membrane, which allows the biological treatment to be performed sufficiently in an intermittent aeration tank by combining an anaerobic tank with a plurality of intermittent aeration tanks and selectively changing an inflow path of influent water according to an operation status of the intermittent aeration tanks. The present disclosure is directed to providing an apparatus and method for alternative aeration-effluent wastewater treatment, which allows the aeration and treated water to continuously discharge through two intermittent aeration tanks by independently forming an air injection line and a treated water discharge line at a ceramic membrane provided in each intermittent aeration tank.

Apparatus and method for alternative aeration-effluent wastewater treatment using ceramic membrane

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Seoul, South Korea

Yong Bae Park