Communications: radio wave antennas – Antennas – High frequency type loops
Patent
1996-09-25
1999-03-09
Wimer, Michael C.
Communications: radio wave antennas
Antennas
High frequency type loops
343702, 343744, 343846, 343855, H01Q 700, H01Q 124
Patent
active
058806970
ABSTRACT:
A multi-band low-profile antenna includes a conductive ground-plane element; a first radiator element mounted on the ground-plane element to define a first vertical loop; a second radiator element mounted on the ground-plane element to define a second vertical loop; and a coupling element mounted on the ground-plane element to define a vertical coupling loop, with one end portion of the coupling element being connected to a feed terminal. In at least one embodiment, the first radiator element and the second radiator element are of such dimensions and are so disposed as to be parasitically coupled to each other, to cause the first radiator element to resonate at a first predetermined VHF frequency and to cause the second radiator element to resonate at a second predetermined VHF frequency. The coupling element is of such dimensions and is so disposed in relation to the first radiator element and the second radiator element as to cause a signal at the first predetermined VHF frequency to be inductively coupled between the first radiator element and the feed terminal and to cause a signal at the second predetermined VHF frequency to be inductively coupled between the second radiator element and the feed terminal. The antenna further includes a third radiator element of such dimensions and is so disposed as to resonate at a predetermined UHF frequency; and the coupling element is of such dimensions and is so disposed as to cause a signal at the predetermined UHF frequency to be inductively coupled between the third radiator element and the feed terminal. A compartment in the ground-plane element encloses circuit components of a communication device connected to the feed terminal.
REFERENCES:
patent: 4862181 (1989-08-01), Ponce De Leon et al.
Burberry, "VHF and UHF Antennas" Peter Peregnus, Ltd. UK, 1992, p. 161.
Johnson "Antenna Engineering Handbook," 3rd ed, Georgia Institute of Technology, 1993, pp. 27-21, 37-18/19.
Cottle Wayne T.
Manherz Ronald K.
McCarrick Charles D.
Seavey John M.
Seay Thomas S.
Callan Edward W.
Torrey Science Corporation
Wimer Michael C.
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