Abstract:
본 발명은 섹터 안테나를 이용한 애드혹 무선 통신 방법, 애드혹 무선통신망의 복구 방법 및 애드혹 무선 통신 시스템에 관한 것으로서, 본 발명에 따른 무선 통신 방법은, 섹터 안테나의 각 섹터로 송신 파워를 변화시키면서 통신 링크 설정을 위한 요구 메시지를 송신하는 단계와, 각 섹터의 수신 노드로부터 요구 메시지에 대응하는 응답 메시지를 수신하는 단계와, 수신한 응답 메시지를 토대로 각 섹터별 송신 파워를 라우팅 테이블로 구성하는 단계 및 라우팅 테이블을 참조하여 각 섹터별 송신 파워로 데이터를 송신하는 단계를 포함한다.
Abstract:
According to the present invention, an antenna of a wireless transferring unit comprises a radiating plate which is spaced from a base; a power supply line which is connected to the radiating plane to supply current to the radiation plate; a shorting pin which makes the radiation plate to be shorted to a chip resistor portion provided on a surface facing the radiation plate of the base; and a dielectric which is disposed between the radiation plate and the base. The present invention may improve the productivity of products because a complicated manufacturing process and a manufacturing process are not required and can be applied in a sensor network system using a small output wireless transmission unit, small wireless devices for Internet of Things (IoT), a mobile radio terminal etc.
Abstract:
PURPOSE: A horizontal beam correcting method of an omni directional antenna and a horizontal beam correcting device are provided to reduce the performance deterioration of an antenna by correcting a radiation direction of the antenna based on a slope of the antenna based on a horizontal surface. CONSTITUTION: A gravity value of each shaft is obtained by using a tilt sensor(301). A slope of the antenna is calculated by using the gravity value of each shaft(302). A switch control signal is generated based on the slope of the antenna(303). A radiation direction of the antenna is corrected according to the switch control signal(304).
Abstract:
An apparatus and a method for variously controlling a radiation direction are provided to control a radiation direction of an antenna into a horizontal direction and a vertical direction of a ground plane. An apparatus for controlling a radiation direction includes an antenna, a plurality of parasitic devices(120-1~120-6), a plurality of lumped circuit devices(126-1~126-6,128-1~128-6), and a determining part. The antenna is a monopole antenna connected to a ground plane(112). A plurality of parasitic devices is positioned around the antenna. Each parasitic device has L shape. Each parasitic device comprises a first part and a second part. The first part is a horizontal part about the ground plane. The second part is a vertical part about the ground plane. The lumped circuit devices are arranged in the first part and the second part. The lumped circuit devices have variable reactance. The determining part determines a radiation direction of the antenna by controlling the reactance of the lumped circuit devices.
Abstract:
A device and a method for impedance matching of a sensor node are provided to extend a limited power use time of the sensor node, improve connection to other peripheral sensor nodes, and secure the communication reliability of the sensor node by improving transmission efficiency of the sensor node. A device for impedance matching of a sensor node includes a variable impedance matching unit(208a), a signal intensity measuring unit(210a), and a control unit(206a). The variable impedance matching unit is positioned between a transmission unit(207a) and an antenna(209a), includes a plurality of impedance matching circuits with different impedance, and selects one of the impedance matching circuits. The signal intensity measuring unit measures intensity of an output signal outputted through the variable impedance matching unit. The control unit controls the impedance matching circuit to have the impedance where the intensity of the output signal is the maximum.
Abstract:
PURPOSE: A folder-type cellular phone having a downward hinge axis is provided to minimize the harmful influence by an electromagnetic wave operated in a human body during a cellular phone call and the degradation of an antenna efficiency by the electromagnetic wave absorption of a head by forming a hinge axis of a body and a cover at a front surface portion of the body separated from an upper surface of the body by a certain interval. CONSTITUTION: A telephone transmitter is composed in one side of a body case(210). A cover(220) is combined at one side of the body case(210) by hinge, and a display window is composed in the cover(220). A transmitting and receiving antenna(230) is installed on an upper end of the body case(210) for transmitting and receiving an RF(Radio Frequency) communication signal. A hinge axis(B1) is installed to be separated from the upper end of the body case(210) by a certain distance for separately combining the cover(220) from the upper end of the body case(210) by the certain distance.
Abstract:
전방향성안테나의수평빔을보정하는수평빔 보정방법및 장치가제공된다. 수평빔 보정장치는, 안테나의기울기에기초하여스위치제어신호를생성할수 있다. 그리고, 생성된스위치제어신호에따라안테나의방사방향을보정할수 있다. 그러면, 보정된안테나의방사방향은지평면을기준으로수평방향의전방향성을가질수 있다.