Abstract:
PURPOSE: A monopole antenna is provided to be capable of being used over a broadband and a low frequency band. CONSTITUTION: The first radiation pole(1) is projected from a ground plane(2) and has a predetermined height. The first radiation plate(3) is loaded on an end of the first radiation pole, and the first radiation cylinder(4) is formed along an edge of the first radiation plate. The second radiation pole(9) is connected to the first radiation pole and is projected on the first radiation plate. The second radiation plate(10) is loaded on an end of the second pole, and the second radiation cylinder(11) is formed along an edge of the second radiation plate.
Abstract:
PURPOSE: An apparatus for cancelling a transmission feedback signal and a relay system using the same are provided to have a broad frequency characteristic and increase the capacity of the entire system by cancelling the transmission feedback signal and preventing the oscillation of a repeater. CONSTITUTION: An ID signal generator(301) generates an ID signal for cancelling a transmission feedback signal. A signal converter having the first phase shifter(306) and a variable attenuator(307) converts a phase and a level of a signal sampled from an output signal of a repeater. A controller(308) compares the ID signal inputted from the ID signal generator(301) with an ID signal included in an original signal received through a receiving antenna(200), and outputs a control signal to the signal converter for minimizing the ID signal included in the original signal. A signal coupler receives the control signal from the controller(308), couples the original signal received through the receiving antenna(200) with the signal converted in the signal converter, and outputs a signal in which the transmission feedback signal is cancelled to the repeater.
Abstract:
무선랜시스템에서프레임송수신방법및 장치가개시된다. 간섭/비간섭스테이션목록생성방법은, 제2 스테이션으로부터제1 프레임을수신하는단계, 제1 프레임으로부터제1 프레임의수신기주소를획득하는단계, 제1 프레임의수신을완료한시점부터미리설정된시간내에수신기주소가나타내는제3 스테이션으로부터제1 프레임의응답인제2 프레임의수신여부를기반으로, 제3 스테이션을간섭스테이션또는비간섭스테이션으로설정하는단계를포함한다. 따라서, 통신시스템의성능이향상될수 있다.