Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1995-04-10
1996-01-02
Hajec, Donald T.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
343789, 343795, 343872, H01Q 226
Patent
active
054812720
ABSTRACT:
A circularly polarized microcell antenna 10 that requires only a single feed-line to radiate circularly polarized electromagnetic energy therefrom. The antenna 10 comprises a reflector box 14 having a bottom 15 and side walls 17 to which an electrical connector 20 is mounted. The center conductor 24 of the connector 20 is electrically connected to a conductor bar 22 upon which a first dipole assembly is mounted at a designated one-quarter wavelength location. The shell of the connector 20 is electrically connected to the reflector box 14 upon which a second dipole assembly is mounted at a designated one-quarter wavelength location. Each dipole assembly comprises a primary dipole arm 52 and a secondary dipole arm 68 which are electrically connected by a phasing loop that introduces a 90.degree. phase shift between the primary dipole arm 52 and the secondary dipole arm 68. Thus, a single feed-line is capable of feeding both the primary and secondary dipoles so as to allow circularly polarized electromagnetic energy to radiate therefrom.
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Hall et al, The ARRL Antenna Book, 1983, pp. 2-9, 5-7-5-22.
Moxon, "HF Antennas for all Locations," 1984, p. 41.
Simple Antenna for Circular Polarisation, IEE Proceedings Part H, vol. 139, No. 2, Apr., 1992, Stevenage, Herts., GB.
Hajec Donald T.
Radio Frequency Systems Inc.
Wigmore Steven
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