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    • 6. 发明申请
    • Antenna
    • 天线
    • US20110181482A1
    • 2011-07-28
    • US11966501
    • 2007-12-28
    • David AdamsAndrew UrquhartWilliam WaddoupDean KitchenerSteven HallSimon Gale
    • David AdamsAndrew UrquhartWilliam WaddoupDean KitchenerSteven HallSimon Gale
    • H01Q13/18H01Q21/00
    • H01Q13/18H01Q21/005H01Q21/08H01Q25/001
    • Embodiments of the invention relate to an antenna structure and are particularly suited to array antennas. Conventionally, an antenna of the cavity-backed slot-radiating type comprises a slot formed in an end of an electrically conductive enclosure, which slot may be energised by a radiating element in registration with the slot. A feed network may connect to the radiating element via a transmission line formed by a conductive track on a feed layer located between the enclosure and an electrically conductive cover. A slot is formed in the section of the cover that covers the end of the cavity in which a slot is formed, such that the two slots are of substantially the same size and shape. A problem with this structure is that the cavity is difficult to mould in one piece and it can be difficult to achieve alignment of respective slots; as a result it is relatively costly to manufacture. Also, it is difficult to insert dielectric material into the enclosure to adjust the performance parameters of the antenna. An antenna according to an embodiment of the invention employs an enclosure having an aperture in one end; in preferred arrangements the aperture provides the enclosure with a substantially open end, over which the cover is placed. The cover has a slot therein, of a smaller size than the size of the aperture presented by the open ended enclosure and the slot in the cover then acts as the radiating slot. The benefit is that it is then easier to insert dielectric material into the enclosure and the enclosure is easier to mould in one piece, leading to a potential cost reduction.
    • 本发明的实施例涉及一种天线结构,并且特别适用于阵列天线。 通常,空腔支撑的槽辐射型天线包括形成在导电外壳的端部中的槽,该槽可以由与槽对准的辐射元件激励。 馈电网络可以经由位于外壳和导电盖之间的馈电层上的导电轨道形成的传输线连接到辐射元件。 在覆盖形成有狭槽的空腔的端部的盖的部分中形成槽,使得两个狭槽具有基本上相同的尺寸和形状。 这种结构的问题是,腔难以一体成型,难以实现各槽的对准; 因此制造成本相对较高。 此外,难以将介电材料插入外壳以调整天线的性能参数。 根据本发明的实施例的天线采用在一端具有孔的外壳; 在优选的布置中,孔为外壳提供了基本上开口的端部,盖子放置在该开口端上。 该盖在其中具有狭槽,其尺寸小于由开放式封闭体所呈现的孔的尺寸,然后盖中的狭缝用作辐射槽。 其优点在于,将电介质材料插入外壳更容易,并且外壳更容易模制成一体,从而降低潜在的成本。
    • 8. 发明申请
    • Passive radio frequency identification (RFID) transponder/reader system and method for survey marker location
    • 被动射频识别(RFID)应答器/读取器系统和测量标记位置的方法
    • US20070126579A1
    • 2007-06-07
    • US11292959
    • 2005-12-02
    • David AdamsDonna Fedukowski
    • David AdamsDonna Fedukowski
    • G08B13/14G08B1/08G08B5/22G01S1/00G01S3/02
    • G01C15/04G01C15/00G01S13/751
    • A system designed to identify survey markers that are obscured by an accumulation of dust and dirt or overgrowth of vegetation. The system provides for automatic detection of survey markers using passive radio frequency transponder technology to detect the immediate presence of a tagged survey marker and read additional unique identification data corresponding to said marker. The operator can be signaled audibly and/or visually when a tagged survey marker is detected. The transmitter and antennae are mounted in a handheld or portable unit. An integrated microprocessor performs the requisite algorithms needed to process the reply from one or more RFID (Radio Frequency Identification) tags and generate the alert signals for the operator alerts. Once the RFID tagged survey marker has been located, it can be cleared of accumulated dust, dirt and overgrowth of vegetation to make it visible for confirming the property boundary. Handheld RFID programmers are used to load or record important identification data in the attached tag, regarding latitude-longitude location, and other pertinent survey data.
    • 一种系统,用于识别被灰尘和污垢积累或植被过度生长所掩盖的勘测标记。 该系统提供使用无源射频转发器技术自动检测测量标记,以检测标记的测量标记的立即存在并读取对应于所述标记的附加唯一识别数据。 当检测到标记的测量标记时,操作员可以以可听和/或视觉的方式发信号通知。 发射器和天线安装在手持或便携式设备中。 集成微处理器执行处理来自一个或多个RFID(射频识别)标签的答复所需的必要算法,并产生用于操作者警报的警报信号。 一旦找到RFID标签的测量标记,就可以清除积累的灰尘,污垢和植被过度生长,使其可见,以确认物业边界。 手持式RFID编程器用于加载或记录所附标签中的重要标识数据,关于纬度和纬度位置以及其他相关调查数据。