Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1997-06-17
1999-07-27
Wimer, Michael C.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
343816, H01Q 2110
Patent
active
059298227
ABSTRACT:
A dipole array antenna is configured for improved cellular operation by avoidance of metallic contacts which can lead to generation of intermodulation products (IMP). Isolated rectangular dipole radiators 12-17 are electromagnetically excited by perpendicularly aligned non-contacting exciter resonators 40-45. The rectangular exciter resonators 40-45 are integrally formed with microstrip signal distribution feed 18 supported above a ground plane 22. A non-contact RF grounded termination for the outer conductor of coaxial input line 52 uses a quarter-wave microstrip line section 56 to provide a low impedance RF path to ground to avoid IMP. An RF-isolated DC grounding circuit for surge protection includes a parallel combination of quarter-wave line sections 62 and 66. Line section 66 provides an RF open circuit path to a DC grounding post 67. Line section 62 provides a parallel non-contact low impedance RF path to ground, avoiding IMP from flow of an RF current through pressure contact points at post 67. The low impedance RF path to ground through line section 62 is isolated from the signal distribution line 18b of the antenna by the RF open circuit provided by quarter-wave line section 68.
REFERENCES:
patent: 3750185 (1973-07-01), Evans
patent: 4287518 (1981-09-01), Ellis
patent: 4825220 (1989-04-01), Edward et al.
Kumpfbeck Richard J.
Schay Gary
Marconi Aerospace Systems Inc.
Onders Edward A.
Robinson Kenneth P.
Wimer Michael C.
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