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An inexpensive, efficient, broadband, slot-type antenna with unidirectional sensitivity includes a slot-forming means defining a plurality of substantially concentric and generally coplanar annular slots and a non-resonant antenna connection means for transmitting electromagnetic energy to and from

An inexpensive, efficient, broadband, slot-type antenna with unidirectional sensitivity includes a slot-forming means defining a plurality of substantially concentric and generally coplanar annular slots and a non-resonant antenna connection means for transmitting electromagnetic energy to and from the plurality of annular slots. The antenna connection means forms a plurality of non-resonant, radially-extending cavities that are adapted to combine electromagnetic energy received at the plurality of concentric, annular slots substantially in phase and to divide electromagnetic energy between the plurality of concentric, annular slots for transmission from the slots generally in phase and along the central slot axis that lies perpendicular to the two concentric, annular, coplanar slots. The antenna may also include a plurality of polarizing antenna elements carried by the slot-forming means adjacent at least one or two of the substantially concentric, annular slots to enhance the unidirectional sensitivity of the antenna. Such a plurality of polarizers may be carried by the slot-forming means in a plurality of locations spaced above and over at least one or two of the concentric annular slots and oriented and distributed around their peripheries at locations to correct for variations to polarity and to suppress cross-polarization to and from the antenna.

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A broadband, slot-type antenna with unidirectional sensitivity, comprising: slot-forming means defining a plurality of substantially concentric and coplanar, annular slots; antenna connection means for transmitting electromagnetic energy to and from the plurality of concentric, annular slots, said a

A broadband, slot-type antenna with unidirectional sensitivity, comprising: slot-forming means defining a plurality of substantially concentric and coplanar, annular slots; antenna connection means for transmitting electromagnetic energy to and from the plurality of concentric, annular slots, said antenna connection means comprising conductor means defining a plurality of interconnected radially extending cavities and forming an unobstructed path adapted to combine electromagnetic energy received at said plurality of concentric annular slots substantially in phase and to divide electromagnetic energy between said concentric, annular slots for transmission from said slots generally in phase along a central axis perpendicular to the plane of the plurality of annular slots.