利索-全球专利检索

  1. 登录
  2. 注册

搜索结果

359 条记录 (耗时 0.015 秒)

    A CIRCUIT ARRANGEMENT FOR REDUCING INTERMODULATION IN A BANDPASS FILTER SYSTEM
    84.
    发明授权
    A CIRCUIT ARRANGEMENT FOR REDUCING INTERMODULATION IN A BANDPASS FILTER SYSTEM 有权
    电路，用于带过滤器装置，异径互调

    公开(公告)号：EP1051808B1

    公开(公告)日：2002-07-17

    申请号：EP99903156.0

    申请日：1999-01-19

    申请人： Remec Oy

    发明人： HUANG, Guanghua ,  HARKONEN, Markku

    IPC分类号： H04B1/10 ,  H01P1/20 ,  H03D9/06

    CPC分类号： H01P1/20 ,  H03D9/06 ,  H04B1/10

    摘要： A circuit arrangement that reduces selected intermodulation. The circuit arrangement includes a signal amplifier coupled to a bandpass filter via an electrical path. Signal energy outside the passband is reflected back into the amplifier and causes intermodulation. The electrical path is constructed with a length that reduces intermodulation, where the length is an odd multiple of one-fourth the wavelength of a predetermined frequency in the passband. The length of the electrical path reduces intermodulation because certain signals reflected by the bandpass filter are approximately 180 DEG , or an odd multiple thereof, out of phase. Energy of problematic signals that are near the edge of the passband or in the stopband is reduced, such as third order intermodulation product and pairs of signals that produce third order intermodulation products.

    IMAGE REJECTION SUB-HARMONIC FREQUENCY CONVERTER REALIZED IN MICROSTRIP, PARTICULARLY ADAPTED TO BE USED IN MOBILE COMMUNICATION EQUIPMENTS
    88.
    发明公开
    IMAGE REJECTION SUB-HARMONIC FREQUENCY CONVERTER REALIZED IN MICROSTRIP, PARTICULARLY ADAPTED TO BE USED IN MOBILE COMMUNICATION EQUIPMENTS 有权
    明镜频率消除MICRO STRIPES梯子SANTANDER次谐波变频器，尤其是应用于移动DEVICES

    公开(公告)号：EP1018214A1

    公开(公告)日：2000-07-12

    申请号：EP98948975.2

    申请日：1998-09-14

    申请人： Italtel s.p.a.

    发明人： POLITI, Marco

    IPC分类号： H03D9/06

    CPC分类号： H03D9/0633

    摘要： It is described an image rejection, sub-harmonic frequency converter, realized in microstrip, particularly adapted to be used in mobile communication equipment. The converter avails of two identical sub-harmonic mixers employing each one or two pairs of diodes in antiparallel, obtained on a same silica substrate, and of a structure of hybrids performing appropriate phase combination adapted to suppress the image band in the converted signal. The mixers include filtering structures preferably consisting, but no limited to the same, of stubs μ/4 long, at the local oscillator frequency, having a free end, in short or open circuit, respectively. According to an alternative embodiment, said stubs are replaced by appropriate filters implemented with concentrated structures (L and C) performing the same transfer function of the stubs in microstrip. The sub-harmonic converter and a traditional converter can be jointly employed in a terminal mobile equipment operating in 'Dual Mode service hand-held' (GSM 900 and DCS 1800) sharing a unique 900 MHz local oscillator.

    N-PORT DIRECT RECEIVER
    90.
    发明公开
    N-PORT DIRECT RECEIVER 有权
    用N GATES直接接收机

    公开(公告)号：EP0962047A1

    公开(公告)日：1999-12-08

    申请号：EP98966371.0

    申请日：1998-12-18

    申请人： Sony International (Europe) GmbH

    发明人： BRANKOVIC, Veselin ,  KRUPEZEVIC, Dragan ,  DÖLLE, Thomas ,  KONSCHAK, Tino

    IPC分类号： H03D9 ,  H04B1 ,  H04L27

    CPC分类号： H03D9/04 ,  H03D2200/0003 ,  H04B1/30 ,  H04L27/3827

    摘要： The present invention relates to n-port junction devices for processing modulated digital RF signals, n being an integer larger than 3, the n-port junction device comprising two RF input ports (4, 5) two passive signal-combining means (2, 3) connected to each other wherein respectively one of the passive signal-combining means (2, 3) is connected to one of the RF inputs (4, 5), and at least two power sensors (P1, P2) wherein each of the passive signal-combining means (2, 3) has at least an output port (6, 7) and each output port (6, 7) is connected to a power sensor (P1, P2). The two passive signal-combining means (2, 3) are connected with each other by means of a phase shifting element (10).