Linearly polarized r.f. radiating slot
First Claim
Patent Images
1. A linearly polarized r.f. radiating slot antenna structure comprising:
- two separate electrically conducting coplanar generally rectangular plates formed as respective islands of metal etched from a common metal sheet and disposed on a dielectric sheet in a spaced apart relationship, said plates having respective first edges juxtaposed substantially within one plane and thereby defining said radiating slot,an electrically conducting ground plane disposed beneath said two plates and electrically connected to respective second edges of said plates by a plurality of separately formed metallic connections extending from said ground plane to said second edges of said plates, each said second edge being opposite its corresponding first edge in said one plane, thus defining an electrical cavity between said plates and said ground plane, andr.f. feed means connected to at least a first one of said two plates.
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Abstract
A linearly polarized r.f. radiating slot is formed by the juxtaposed but separated and unshorted edges of two electrically conducting plates disposed above a ground plane. R.f. feedline is connected proximate the slot edges and, preferably, distributed therealong so as to provide a more uniform feed. In a non-resonant embodiment, lumped reactance (preferably plural discrete devices distributed along the slot length) is connected across the slot so as to form a resonant antenna structure. Both the slot and the r.f. feedline are preferably formed by photo etching techniques commonly used for the construction of printed circuits.
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Citations
24 Claims
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1. A linearly polarized r.f. radiating slot antenna structure comprising:
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two separate electrically conducting coplanar generally rectangular plates formed as respective islands of metal etched from a common metal sheet and disposed on a dielectric sheet in a spaced apart relationship, said plates having respective first edges juxtaposed substantially within one plane and thereby defining said radiating slot, an electrically conducting ground plane disposed beneath said two plates and electrically connected to respective second edges of said plates by a plurality of separately formed metallic connections extending from said ground plane to said second edges of said plates, each said second edge being opposite its corresponding first edge in said one plane, thus defining an electrical cavity between said plates and said ground plane, and r.f. feed means connected to at least a first one of said two plates. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A linearly polarized, r.f. radiating slot antenna structure comprising:
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two separated islands of metal disposed on a dielectric sheet defining a radiating slot with open non-shorted slot ends and having separated opposed conductive linear edges formed by selectively etching away a portion of an integral electrically conductive layer bonded to a first side of the dielectric sheet, a ground plane underlying said radiating slot and a plurality of metal electrical connections between the ground plane and an array of linear points on each of said islands remote from said radiating slot defining a cavity between said plural connections, said ground plane and said islands, and an r.f. feedline having at least one conductive member respectively connected proximate the middle portion of at least one of the thusly formed edges of said radiating slot. - View Dependent Claims (11, 12, 13)
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14. A linearly polarized r.f. radiating slot antenna structure comprising:
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a radiating slot with open non-shorted slot ends and having separated opposed conductive edges formed by selectively etching away a portion of an integral electrically conductive layer bonded to the first side of a dielectric sheet so as to form plural isolated coplanar islands of metal, a conductive ground plane underlying said radiating slot and defining an included cavity therebetween with plural electrical connections extending from said ground plane through said dielectric sheet to each of said islands of metal but only at points remote from said radiating slot, and an r.f. feedline having at least one conductive member respectively connected proximate the middle portion of at least one of the thusly formed edges of said radiating slot, said conductive ground plane being disposed opposite the other side of said dielectric sheet and electrically connected to said layer by said plural electrical connections to define said included cavity having at least one resonant dimension at the intended r.f. operating frequency. - View Dependent Claims (15, 16, 17, 18)
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19. A method of transmitting or receiving linearly polarized r.f. electromagnetic signals, said method comprising the steps of:
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forming a radiating slot with open non-shorted ends by selectively etching away a portion of an electrically conductive layer bonded to one side of a dielectric sheet so as to form islands of metal comprising two separate electrically conducting coplanar generally rectangular metallic plates having respective edges juxtaposed substantially within one plane and thereby defining said radiating slot, said plates being disposed above a ground plane and electrically connected thereto only at plural points along a line generally parallel to but remote from the juxtaposed plate edges forming said radiating slot so as to form an electrical cavity therebetween, and feeding electrical r.f. signals to/from at least one connection made across said slot and proximate the middle portion of at least one of said edges which form the radiating slot. - View Dependent Claims (20, 21)
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22. A method of manufacturing a linearly polarized r.f. radiating slot antenna, said method comprising the steps of:
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selectively etching a first conductive layer bonded to the top of a dielectric sheet to form a radiating slot with open non-shorted ends and having opposed conductive edges, selectively etching a second conductive layer bonded to the bottom of said dielectric sheet to form a corporate-structured feedline conductor, providing a third conductive ground plane layer spaced below said dielectric sheet, said corporate-structured feedline having branches spaced apart below and along said slot, and connecting said branches through passages formed in said dielectric sheet to said first conductive layer proximate the middle portion of one of said edges. - View Dependent Claims (23)
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24. A linearly polarized r.f. radiating slot antenna structure comprising:
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a five layered structure having two layers of dielectric material sandwiched between three layers of electrically conductive material, one conductive layer being on top, one conductive layer being on the bottom and one conductive layer being interposed in the middle of said five layered structure; said top conductive layer being selectively etched away to define separate conductive areas having juxtaposed edges which define an r.f. radiating slot with open non-shorted ends; said middle conductive layer being selectively etched away to define a corporate structure r.f. feedline; and feed through electrical connectors connecting said top and bottom conductive layers to form a cavity and connecting said middle conductive layer to said top conductive layer for feeding r.f. signals to/from the middle portion of at least one of said edges in said top conductive layer.
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Specification