Abstract:
An antenna switching circuit is provided to solve a problem that in case an LPF(Low Pass Filter) and an HFP(High Pass Filter) are configured with elements such as a pin diode, a capacitor, an inductor and a resistor, etc., much harmonics are generated when a transmission signal is transmitted, so the transmission signal cannot be clearly transmitted. The first LPF(100) are connected with an antenna(ANT) and extracts the first and second signals as received. The first reception signal output unit(140) outputs the first and second signals, which have been extracted by the firs LPF(100), to the outside. The second LPF(130) filters the first and second signals to be transmitted, and outputs them to the antenna through the first LPF(100). The first switching unit(120) switches the operation of the second LPF(130) according to the first control voltage. An HPF(110) is connected with the antenna(ANT) and extracts the third to fifth signals. The second reception signal output unit(170) outputs the third signal, which has been extracted by the HPF(110), to the external. The third LPF(160) filters the third to the fifth signals to be transmitted, and outputs them to the antenna(ANT) through the HPF(110). The second switching unit(150) switches the operation of the third LPF(160) according to the second control voltage. The third reception signal output unit(190) outputs the fourth and fifth signal, which have been extracted by the HPF(110), to the exterior. The third switching unit(180) switches the operation of the third reception signal output unit(190) according to the third control voltage.
Abstract:
본 발명은 초고주파의 신호가 움직이는 물체에서 반사될 경우에 주파수가 변화되는 도플러(doppler) 효과를 이용하여 소정 물체의 움직임을 검출한다. 본 발명에 따르면, 발진기를 이용하여 소정 주파수의 초고주파 신호를 발생하고, 발생한 초고주파 신호를 안테나를 통해 움직임 물체의 검출영역으로 송출하여 반사되는 초고주파 신호를 검출하며, 검출한 초고주파 신호와 발진기가 발생한 초고주파 신호를 혼합하여 움직이는 물체의 검출신호를 생성한다. 생성한 움직이는 물체의 검출신호를 증폭기로 증폭하고, 마이크로 컴퓨터로 입력시켜 움직이는 물체의 유무를 판단하는 것으로서 주변 환경의 변화에 관계없이 움직이는 물체의 유무를 정확하게 검출한다. 도플러, 움직임 검출센서, 혼합, 도파관, 초고주파, K밴드
Abstract:
A patch antenna is provided to transmit and receive an ultrahigh frequency signal by being attached to a wave guide without forming a separate feeding pad. In a patch antenna, an antenna pattern(310) is formed on a front surface of a dielectric substrate(300). A ground pattern(320) is formed on a rear surface of the dielectric substrate(300). An etching unit(330) enables the front and rear surfaces of the dielectric substrate(300) to transmit an ultrahigh frequency signal by etching the ground pattern(320). The ground pattern(320) is made of a metal material. The etching unit(320) etches a middle part of the dielectric substrate(300) by the metal material to be exposed. A size of the etching unit(330) is varied according to a frequency of the ultrahigh frequency signal to transmit and receive.
Abstract:
PURPOSE: A broadband antenna is provided to broaden the frequency bandwidth by using a double resonance effect by means of a patch element and a serial resonant circuit of an L-shaped feeding structure. CONSTITUTION: A broadband antenna includes an antenna connection plug(100), a ground plate(110), a micro strip line(120), an inverse L-shaped feeder(130), and a radiative patch(140). The antenna connection plug(100) includes a ground portion(101) and an antenna line connection portion(103). The ground plate(110) is electrically connected to the ground portion(101). The micro strip line(120) is connected to the antenna line connection portion(103). The inverse L-shaped feeder(130) is formed at the micro strip line(120). The radiative patch(140) is installed on an upper portion of the inverse L-shaped feeder(130).
Abstract:
도체 패턴이 인쇄된 다수의 그린 쉬트(green sheet)를 적층하여 커패시터, 커플러 및 접지선을 갖는 유전체층을 형성하고, 유전체층의 측면에는 외부 신호를 입출력하기 위한 다수의 측면 전극을 형성하고, 유전체층의 상부에는 다수의 표면 전극을 형성하고, 표면 전극에 저항 및 배랙터를 연결하여 다층 기판의 형태를 갖는 멀티 칩 모듈형 가변 위상기를 형성한다.
Abstract:
PURPOSE: A frequency selective surface unit cell and a device for suppressing surface wave are provided to efficiently suppress a surface wave by attaching a surface wave suppressor of a unit cell to a ground side. CONSTITUTION: In a frequency selective surface unit cell and a device for suppressing surface wave, a frequency selective surface unit cell comprises a first dielectric layer(120) and a second dielectric layer(110) The first dielectric layer has the bottom side contacting to the ground side and the top side contacting to the second dielectric layer. The second dielectric layer and the first dielectric layer are laminated. A resonator(111) has a part of a folded metallic part which is opposite to the surface of the second dielectric layer.