Communications: radio wave antennas – Antennas – With grounding structure
Patent
1999-02-04
2000-12-05
Le, Hoanganh
Communications: radio wave antennas
Antennas
With grounding structure
343700MS, 343830, H01Q 148, H01Q 138
Patent
active
061573485
ABSTRACT:
A low-profile antenna has increased broad-banding capacities as well as a lower radiation angle for enhanced cellular or mobile telephone wireless transmissions. Enhancing a basic PIFA antenna, a top metal radiator is notched so as to provide additional corners and greater perimeter length thereby enhancing the bandwidth capabilities of the antenna. Both ground and tuning tabs serve to enhance operational characteristics and a dielectric cover incorporating prismatic qualities serves to lower the radiation angle of transmission from approximately forty degrees (40.degree.) to twenty degrees (20.degree.). The prisms provide an operating radiation angle in the range of approximately seventy degrees (70.degree.) to twenty degrees (20.degree.). In one embodiment, a sheet of plastic foam slightly thicker than the depth of an associated connector is secured to the underside of the bottom plate to act as a friction seal when the antenna is screwed onto a mating connector, allowing for slight variations in the curvature of the mounting surface. By making the bottom conductive plate only slightly larger than the top radiator, the antenna's resonant frequency becomes independent of ground plane mounting and may not require such a ground plane. Under such circumstances, some adjustment of the tuning parameters may be required in order to provide optimum response.
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Capacitive Matching of Microstrip Patch Antennas--Alexander.
Mobile Antenna Systems Handbook--Fujimoto, James.
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Experimental Results with Mobile Antennas --Kuboyama, Tanaka, Sato, Fujimoto.
Antenex, Inc.
Cislo Daniel M.
Jordan Andrew S.
Le Hoang-anh
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