Multidirectional feed and flush-mounted surface wave antenna
Patent 4682180 Issued on July 21, 1987. Estimated Expiration Date: 
September 23, 2005. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
September 23, 2005. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 2637814 2644090 2867803 3631500 3805266 Antenna system Slot antenna Directional annular slot antenna Annular slot antenna Transit antenna InventorApplicationNo. 06/779108 filed on 09/23/1985US Classes:343/769, Ring-shaped slot343/783, With internal-wave refraction means343/785, Dielectric type (e.g., polystyrene rod)343/873, Antenna embedded, potted, or coated343/909Refracting means and radio wave energy filters (e.g., lenses and polarizers)ExaminersPrimary: Nussbaum, Marvin L.Attorney, Agent or FirmInternational ClassesH01Q 13/10 (20060101)H01Q 13/18 (20060101) H01Q 3/24 (20060101) AbstractThe present invention relates to a multidirectional feed which can be used by itself or preferably incorporated within a surface wave structure to form a flush-mounted antenna on, for example, a mobile unit. The feed arrangement comprises a ground plane including an annular cavity with a smaller annular slot. The annular slot is connected by multiple, spaced-apart, leads to an associated transceiver. The annular cavity is also formed to prevent both a shorting of the radio waves therein and the radio waves from propagating away from the cavity in a direction opposite the slot. A surface wave structure is disposed preferably with the feed centrally mounted and can comprise any suitable structure including annular corrugations and/or a dielectric layer to provide a flush-mounted antenna arrangement which provides radiation in azimuth in all directions with moderate elevation gain.Other References
Field of SearchSlot typeWith periodic control of slot or coupling Ring-shaped slot With wave guide coupling Dielectric type (e.g., polystyrene rod) With reflector With aircraft Lighter-than-air device Aircraft part of active antenna or vice versa Watercraft part of active antenna or vice versa With vehicle With internal-wave refraction means With horn Antenna embedded, potted, or coated Refracting means and radio wave energy filters (e.g., lenses and polarizers) Wave guide type (e.g., horn) Biconical horn type With reflector Slot type | |
