Communications: radio wave antennas – Antennas – Slot type
Patent
1997-05-09
2000-03-28
Wong, Don
Communications: radio wave antennas
Antennas
Slot type
343700MS, 343767, H01Q 1310
Patent
active
060437863
ABSTRACT:
The multi-band slot antenna structure and method uses a single antenna to cover at least two distinct reception frequency bands using only one excitation port. In a first type of configuration, dual resonant slots (320, 325) are placed in close proximity and driven using a single differential excitation port having a positive node (370) and a negative node (375). In a second type of configuration, a half wavelength conductor (560, 660, 760) is layered over a quarter wavelength slot (520, 720) or half wavelength slot (620), and when the conductor is heavily magnetically coupled to the slot, a virtual electric short is achieved across the slot. In a third type of configuration, a quarter wavelength conductor (1060, 1160) is layered over a quarter wavelength slot (1020) or half wavelength slot (1120), and the conductor is used to capacitively or inductively load the slot (1120) at frequencies other than the natural resonant frequency of the slot (1120).
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"Microstrip Lines And Slotlines," by K.C. Gupta, Ramesh Garg, and I.J. Bahl, Artech, Chapter 6, Slotlines 11, pp. 231-254.
IEEE Transactions On Microwave Theory And Techniques, vol. MTT-17, No. 12, Dec. 1969, "Slot Line Characteristics," by Elio A. Mariani, Charles P. Heinzman, John P. Agrios, and Seymour B. Cohn, pp. 1091-1096.
IEEE Transitions On Microwave Theory And Techniques, May 1974, "Slot-Line Transactions," by Jeffrey B. Knorr, pp. 548-554.
IEEE Transactions On Microwave Theory And Techniques, Aug. 1976, Letters, "Expressions for Wavelength And Impedance Of A Slotline," by Ramesh Garg And K.C. Gupta, p. 532.
Smith Hugh Kennedy
Vannatta Louis Jay
Chen Sylvia
Motorola Inc.
Nguyen Hoang
Wong Don
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