Multi-band slot antenna structure and method
First Claim
1. A multi-band slot antenna resonant at both a first frequency and at a second frequency comprising:
- a first slot, that is a quarter wavelength at the first frequency, having an open end and a closed end, implemented in a conductive ground plane;
a second slot, that is a quarter wavelength at the second frequency, having an open end and a closed end, implemented in the conductive ground plane;
a strip of the conductive ground plane common to the first slot and the second slot;
a positive node of a differential excitation port coupled to the conductive ground plane proximate to the first slot at a proportional distance from the closed end of the first slot; and
a negative node of the differential excitation port coupled to the conductive ground plane proximate to the second slot at the proportional distance from the closed end of the second slot.
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Accused Products
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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Citations
16 Claims
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1. A multi-band slot antenna resonant at both a first frequency and at a second frequency comprising:
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a first slot, that is a quarter wavelength at the first frequency, having an open end and a closed end, implemented in a conductive ground plane; a second slot, that is a quarter wavelength at the second frequency, having an open end and a closed end, implemented in the conductive ground plane; a strip of the conductive ground plane common to the first slot and the second slot; a positive node of a differential excitation port coupled to the conductive ground plane proximate to the first slot at a proportional distance from the closed end of the first slot; and a negative node of the differential excitation port coupled to the conductive ground plane proximate to the second slot at the proportional distance from the closed end of the second slot. - View Dependent Claims (2, 3)
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4. A multi-band slot antenna resonant and radiant at both a first frequency and at a second frequency comprising:
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a slot implemented in a conductive ground plane that is resonant and radiant at the first frequency; and a conductor that is resonant but not appreciably radiant at the second frequency, different than the first frequency, and highly electromagnetically coupled to the first slot at the second frequency while negligibly electromagnetically coupled to the first slot at frequencies other than the second frequency, such that the slot is resonant and radiant at the second frequency. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A radiotelephone comprising:
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a first slot, that is a quarter wavelength at a first frequency, having an open end and a closed end, implemented in a conductive ground plane; a second slot, that is a quarter wavelength at a second frequency, having an open end and a closed end, implemented in the conductive ground plane; a strip of the conductive ground plane common to the first slot and the second slot; a positive node of a differential excitation port coupled to the conductive ground plane proximate to the first slot at a proportional distance from the closed end of the first slot; and a negative node of the differential excitation port coupled to the conductive ground plane proximate to the second slot at the proportional distance from the closed end of the second slot.
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15. A radiotelephone comprising:
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a slot implemented in a conductive ground plane that is resonant and radiant at a first frequency; and a conductor that is resonant but not appreciably radiant at a second frequency, different than the first frequency, and highly electromagnetically coupled to the first slot at the second frequency while negligibly electromagnetically coupled to the first slot at frequencies other than the second frequency, such that the slot is resonant and radiant at the second frequency. - View Dependent Claims (16)
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Specification