Slot fed multi-band antenna
First Claim
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1. An antenna circuit comprising:
- an antenna member having a first length with a high resonance frequency, a second length with a low resonance frequency, and a switch member for alternating between said first length and said second length;
a dielectric substrate coupled to said antenna member;
a bottom ground plane adjacent to said dielectric substrate;
a feed member positioned in said dielectric substrate, said feed member interposed between said bottom ground plane and said antenna member; and
a top ground plane interposed between said dielectric substrate and said antenna member, said top ground plane containing a radiating array having a first radiating frequency and a second radiating frequency.
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Abstract
An antenna circuit, a method of manufacturing, and a method of operating the same are provided. An antenna member, a first dielectric layer, a top ground plane, a radiating slot ring through the top ground plane, a second dielectric layer, a stripline feed member, a third dielectric layer, and a bottom ground plane are all laminated together within a specified arrangement to form an efficient multi-band micro-strip antenna circuit. A micromachined electromagnetic switch is utilized to alter the length of the antenna member, thereby producing resonant frequencies which correlate with those radiated by the ring slot.
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Citations
15 Claims
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1. An antenna circuit comprising:
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an antenna member having a first length with a high resonance frequency, a second length with a low resonance frequency, and a switch member for alternating between said first length and said second length;
a dielectric substrate coupled to said antenna member;
a bottom ground plane adjacent to said dielectric substrate;
a feed member positioned in said dielectric substrate, said feed member interposed between said bottom ground plane and said antenna member; and
a top ground plane interposed between said dielectric substrate and said antenna member, said top ground plane containing a radiating array having a first radiating frequency and a second radiating frequency. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
a first slot having a first wavelength associated with said first radiating frequency, said first slot being substantially perpendicular to said antenna member; and
a second slot having a second wavelength associated with said second radiating frequency, said second slot being substantially parallel to said first slot.
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4. The antenna circuit as claimed in claim 3 wherein said first and second slots are substantially perpendicular to said feed member and where said feed member has a termination end located one-half said first wavelength from said first slot and where said termination end is located one-half said second wavelength from said second slot.
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5. The antenna circuit as claimed in claim 3 further comprising a third and a fourth slot interconnecting said first and second slots forming a ring slot.
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6. The antenna circuit as claimed in claim 5 wherein said ring slot has said first and second slots substantially perpendicular to said feed member and where said feed member has a termination end located one-half said first wavelength from said first slot and where said termination end is located on-half said second wavelength from said second slot.
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7. The antenna circuit as claimed in claim 1 wherein said top ground plane and said bottom ground plane comprise copper cladding.
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8. The antenna circuit as claimed in claim 1 wherein said top ground plane and said bottom ground plane comprise gold plating.
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9. The antenna circuit as claimed in claim 1 wherein said switch member comprises a micromachined electromagnetic switch.
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10. The antenna circuit as claimed in claim 1 wherein said feed member comprises a stripline member.
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11. The antenna circuit as claimed in claim 1 wherein said antenna member is selected from a group consisting of a slot antenna, a patch antenna, and a dipole antenna.
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12. A method of transmitting a high and a low resonance frequency from an antenna circuit, comprising the steps of:
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energizing a tap end of a feed member to produce an electromagnetic field;
energizing a radiating array by the electromagnetic field;
radiating a first radiating frequency with a first wavelength associated with a first slot and a second radiating frequency with a second wavelength associated with a second slot through the energized radiating array;
resonating a single antenna member by the first and the second radiating frequencies;
generating, alternately, the high resonance frequency and the low resonance frequency from a first length and a second length of the single antenna member, respectively. - View Dependent Claims (13, 14, 15)
switching to the second length by closing a switch member; and
switching to the first length by opening the switch member.
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14. A method of transmitting a high and a low resonance frequency as claimed in claim 13, further comprising the steps of:
opening and closing the switch member by use of electrical power where the switch member is a micromachined electromechanical switch.
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15. A method of transmitting a high and a low resonance frequency as claimed in claim 12, further comprising the steps of:
holding a top ground plane and a bottom ground plane to the same potential so that the top ground plane containing the radiating array (33) eliminates unwanted electromagnetic radiation and the bottom ground plane acts as a ground for the feed member and suppresses unwanted background and parasitic radiation.
Specification