US Patent No: 5,300,936
Number of patents in Portfolio can not be more than 2000
Multiple band antenna
Stats
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Apr 5, 1994
Issued date -
Sep 30, 1992
filing date -
07/954,274
serial no -
In Force
status
Importance
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Abstract
An antenna for reception of signals in a plurality of frequency bands employed in portable and vehicular communications is constructed of a dielectric layer disposed on a metallic plate which serves as a ground plane. Microstrip antenna elements in the form of a planar radiator encircled by a loop radiator are disposed upon the dielectric layer. A rod radiator oriented normally to the plate extends through the patch radiator and the dielectric layer, and is surrounded by a dielectric cylinder which insulates the rod radiator from the planar radiator and the plate. The planar radiator may be configured as a patch radiator, a spiral radiator, or a crossed dipole radiator. Also, one or more additional layers of patch radiator elements may stacked upon the patch radiator to provide a stacked microstrip radiator. Terminals are positioned about the planar radiator for extracting orthogonal components of a circularly polarized electromagnetic signal. All radiators are smaller than approximately one-half wavelength of the shortest wavelength signal to be received by the antenna. The antenna is useful for receiving vehicular signals such as telephony, keyless door lock operation, ground positioning satellite signals, as well as AM/FM radio.
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First Claim
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International Classification(s)
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Cited Art
| Patent Info | (Count) | # Cites | Year |
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| 4,821,040 Circular microstrip vehicular rf antenna | 75 | 1986 | |
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| 4,835,541 Near-isotropic low-profile microstrip radiator especially suited for use as a mobile vehicle antenna | 57 | 1986 | |
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| 4,943,809 Electromagnetically coupled microstrip antennas having feeding patches capacitively coupled to feedlines | 18 | 1988 | |
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| 4,675,687 AM-FM cellular telephone multiband antenna for motor vehicle | 37 | 1986 | |
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| 4,644,361 Combination microstrip and unipole antenna | 19 | 1985 | |
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| 4,887,089 Planar antenna for vehicles | 14 | 1984 | |
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| 5,099,249 Microstrip antenna for vehicular satellite communications | 26 | 1987 | |
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| 4,329,689 Microstrip antenna structure having stacked microstrip elements | 35 | 1978 | |
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| 4,755,823 Keyless vehicle entry apparatus | 8 | 1986 | |