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    Resonator, filter, oscillator, duplexer, and communication apparatus
    12.
    发明公开
    Resonator, filter, oscillator, duplexer, and communication apparatus 审中-公开
    谐振器，滤波器，振荡器，双工器和机器人

    公开(公告)号：EP1132993A3

    公开(公告)日：2001-11-14

    申请号：EP01105154.7

    申请日：2001-03-02

    Applicant: Murata Manufacturing Co., Ltd.

    Inventor： Iio, Kenichi, (A170) Intell. Prop. Dept.

    IPC: H01P1/201 ,  H01P1/213 ,  H01P7/00 ,  H01P7/10

    CPC classification number: H01P7/08 ,  H01P1/2016 ,  H01P1/2135

    Abstract: A resonator, a filter, an oscillator, a duplexer, and a communication apparatus employing these devices have improved efficiency characteristics in confining an electromagnetic field in an opening of an electrode, suppressed current concentration, and minimized conductor loss. Electrode patterns (2' ) are formed near short-circuited positions in a slot (3) so that the slot (3) will be divided into smaller-width slot lines. Consequently, the efficiency in confining the electromagnetic field is improved, and conductor loss is minimized. In another embodiment, an opening (6) is defined within an electrode, and a plurality of electrode patterns (2') extend radially inwards from a periphery of the opening.

    Abstract translation: 谐振器，滤波器，振荡器，双工器以及采用这些器件的通信设备具有改善的效率特性，以限制电极开口中的电磁场，抑制的电流集中和最小的导体损耗。 在槽（3）中的短路位置附近形成电极图案（2'），使得槽（3）将被分割成较小宽度的槽线。 因此，提高了限制电磁场的效率，并且使导体损耗最小化。 在另一个实施例中，在电极内限定开口（6），并且多个电极图案（2'）从开口的周边径向向内延伸。

    Balanced microstrip filter
    14.
    发明公开
    Balanced microstrip filter 失效
    Gegentakt-Mikrostreifenleitungsfilter

    公开(公告)号：EP0836239A1

    公开(公告)日：1998-04-15

    申请号：EP97305395.2

    申请日：1997-07-18

    Applicant: NORTHERN TELECOM LIMITED

    Inventor： Falt, Christopher

    IPC: H01P1/201

    CPC classification number: H01P1/20363 ,  H01P1/201 ,  H01P5/10

    Abstract: A low-radiation balanced microstrip bandpass filter is provided. A series of microstrip segments (50,52,54,56,58) are arranged on the surface of a substrate. The degree of coupling between adjacent pairs of segments is determined by the length of overlap between them. By always having pairs of segments, a very small far field radiation is achieved.

    Abstract translation: 提供了低辐射平衡微带带通滤波器。 一系列微带段（50,52,54,56,58）布置在基板的表面上。 相邻的段对之间的耦合度由它们之间的重叠长度确定。 通过总是具有成对的段，实现了非常小的远场辐射。

    Low-noise-figure aperture antenna
    19.
    发明公开
    Low-noise-figure aperture antenna 审中-公开
    孔径天线具有低噪声电平

    公开(公告)号：EP2613408A9

    公开(公告)日：2013-10-09

    申请号：EP13150191.8

    申请日：2013-01-03

    Applicant: Università Degli Studi Roma Tre

    Inventor： Bilotti, Filiberto ,  Toscano, Alessandro ,  Ramaccia, Davide ,  Di Palma, Luca

    IPC: H01Q13/02 ,  H01Q15/00 ,  H01P1/201

    CPC classification number: H01Q13/02 ,  H01P1/042 ,  H01P1/2016 ,  H01Q15/0053 ,  H01Q15/006

    Abstract: The present invention concerns an aperture antenna (20) that comprises: a receiving element (21), which includes an aperture (21a) and is configured to receive, through said aperture (21a), radio signals having frequencies comprised within a given band of radio frequencies (B 1 ); a waveguide (22) configured to receive radio signals from the receiving element (21); and a frequency selective structure, which is arranged between the receiving element (21) and the waveguide (22), and comprises metamaterial structures that extend partially inside the receiving element (21) and/or partially inside the waveguide (22) and that are configured to cause the propagation, from the receiving element (21) to the waveguide (22), of only the received radio signals that have frequencies comprised within a predetermined sub-band (B 2 ) of the given band of radio frequencies (B 1 ). Furthermore, the frequency selective structure is configured to reflect back into the receiving element (21) the received radio signals that have frequencies not comprised in the predetermined sub-band (B 2 ).

    AN ELECTRICALLY TUNABLE WAVEGUIDE FILTER AND WAVEGUIDE TUNING DEVICE
    20.
    发明公开
    AN ELECTRICALLY TUNABLE WAVEGUIDE FILTER AND WAVEGUIDE TUNING DEVICE 审中-公开
    电动可调波导滤波器和轴管理中心设置DEVICE

    公开(公告)号：EP2601707A1

    公开(公告)日：2013-06-12

    申请号：EP10737338.3

    申请日：2010-08-02

    Applicant: Telefonaktiebolaget LM Ericsson (publ)

    Inventor： LIGANDER, Per ,  BASTIOLI, Simone ,  PELLICCIA, Luca ,  PERSSON, Ove ,  SORRENTINO, Roberto

    IPC: H01P1/201 ,  H01P1/207

    CPC classification number: H01P3/12 ,  H01P1/10 ,  H01P1/2016 ,  H01P1/207

    Abstract: The present invention relates to a waveguide tuning device (1) arranged for mounting in a waveguide structure (2) which has a longitudinal extension (L) and comprises a first inner wall (3), a second inner wall (4), a third inner wall (5) and a fourth inner wall. The inner walls are arranged such that a rectangular cross-section is obtained for the waveguide structure. The first inner wall (3) and the second inner wall (4) have a first length (b) and are facing each other. The third inner wall (5) and the fourth inner wall (6) have a second length (a) and are facing each other. The electrical field (E) is parallel to the main surfaces of the first inner wall (3) and the second inner wall (4). The tuning device (1) is electrically controllable and arranged for mounting at the first inner wall (3) and/or the second inner wall (4). The present invention also relates to a tunable waveguide structure.

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