摘要:
Multi-band filter apparatus is provided including a housing in which at least one resonating means is provided. The at least one resonating means is capable of resonating at one or more frequencies. Each of said at least one resonating means is arranged such that one or more radio frequency signals in at least two different and distinct passbands are able to pass therethrough in use.
摘要:
A tunable bandpass filter (10) is used for filtering an electromagnetic signal, has a system passband (18) between a first and a second tunable cutoff frequencies, and has a first subfilter (12) and a second subfilter (14) connected to one another in series between an input port (11) and an output port (17) and being complementary to one another in the tunable bandpass filter (10). At least one of the first subfilter (12) and the secondsubfilter (14) is connected to operate in reflection.
摘要:
Embodiments of a microwave oscillator and method for amplitude noise reduction are generally described herein. The oscillator may include a resonator and an RF bridge to combine an incident and a reflected RF signal. The oscillator may further comprise an amplitude noise reduction loop, which may be configured to use a first baseband control signal to perform amplitude modulation (AM) of an oscillator feedback signal for reduction of amplitude noise on the oscillator output signal.
摘要:
본 발명은 캐비티(cavity) 구조를 가진 무선 주파수 필터에 있어서, 캐비티를 갖기 위해 내부가 중공이고 일측으로 개방면을 갖는 하우징과; 하우징의 개방면을 밀봉하는 커버와; 하우징의 중공에 위치하는 공진소자를 포함하며; 커버 또는 하우징의 미리 설정된 부위에는, 외부에서 분사되거나 외부로 흡입되는 공기를 이용하여 필터의 에어 세척 작업을 수행하기 위한 제1 및 제2 세척용 홀이 형성되고; 에어 세척 작업 완료 후 제1 및 제2 세척용 홀을 밀봉하기 위한 밀봉 부재가 설치된다.
摘要:
The invention is a compact three-port signal combiner suitable for use in a base station having two different wireless systems. The combiner is designed as a four-port network, but one of the ports is terminated with a predetermined load, thus leaving three ports for connection to user equipment. A first port (A) receives from an antenna a first input signal comprising first and second receive bands and transmits to the antenna a first output signal comprising a transmit band. A second port (R), connected to the first wireless system, outputs to the first wireless system a second output signal comprising the first and second receive bands. A third port (T\R) outputs, to the second wireless system, a third output signal comprising the first and second receive bands and receives from the second wireless system a second input signal that is to be transmitted from the first port.
摘要:
A plurality of tunable cross-coupled resonators (1-5) are connected using capacitive coupling elements (212, 214, 216, 218) to form a cross-coupled bandpass filter (200). A center frequency of the filter (200) may be set based on frequencies of the resonators (1-5) and a fractional bandwidth of the filter may be set based on states of the capacitive coupling elements (212, 214, 216, 218). Programmable zeroes of the filter (200) may be set based on states of reactive elements (228, 230) coupling selected pairs of the resonators. The reactive elements may be capacitive, for zeroes below the center frequency, or inductive, for zeroes above the center frequency.