Capacitively-loaded bent-wire monopole on an artificial magnetic conductor
First Claim
1. An antenna comprising:
- an artificial magnetic conductor (AMC);
an antenna element disposed on the AMC, the antenna element having a feed; and
a capacitive load connected with the antenna element, the capacitive load separated from the feed.
2 Assignments
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Accused Products
Abstract
An antenna consisting of a thin strip bent-wire monopole disposed on an artificial magnetic conductor (AMC) is loaded at the end opposite to the feed point with a distributed or lumped capacitance to achieve an electrically small antenna for use in handheld wireless devices. The capacitive load reduces the length of the antenna to smaller than one-quarter of a wavelength at a given frequency of operation without suffering a substantial loss of efficiency. This results in an easier integration into portable devices, greater radiation efficiency than other loaded antenna approaches and longer battery life in portable devices, and lower cost than use of a chip inductor.
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Citations
56 Claims
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1. An antenna comprising:
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an artificial magnetic conductor (AMC);
an antenna element disposed on the AMC, the antenna element having a feed; and
a capacitive load connected with the antenna element, the capacitive load separated from the feed. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. An antenna comprising:
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an artificial magnetic conductor (AMC) including an RF backplane and a frequency selective surface (FSS) having conductive patches, at least one of the patches being conductively connected to the RF backplane;
an insulating layer disposed on the AMC;
a bent-wire monopole disposed on the insulating layer, the bent-wire monopole having a feed at a first end; and
a capacitive load connected with the bent-wire monopole, the capacitive load separated from the feed. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43)
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- 44. A method of reducing a length of a bent-wire monopole disposed on an artificial magnetic conductor (AMC), the method comprising establishing a capacitance in excess of that of a per unit length capacitance of the bent-wire monopole between the bent-wire monopole and ground and establishing that the capacitance is disposed more distal to a feed of the bent-wire monopole than to an opposing end of the bent-wire monopole.
Specification