專利 US6864848 - RF MEMs-tuned slot antenna and a method of making same

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US006864848B2

(12) United States Patent (io) Patent No.: US 6,864,848 B2

Sievenpiper (45) Date of Patent: Mar. 8,2005

(54) RF MEMS-TUNED SLOT ANTENNA AND A METHOD OF MAKING SAME

(75) Inventor: Daniel F. Sievenpiper, Los Angeles, CA (US)

(73) Assignee: HRL Laboratories, LLC, Malibu, CA (US)

( * ) Notice: Subject to any disclaimer, the term of this patent is extended or adjusted under 35 U.S.C. 154(b) by 28 days.

(21) Appl. No.: 10/192,986

(22) Filed: Jul. 9, 2002

(65) Prior Publication Data

US 2003/0122721 Al Jul. 3, 2003

Related U.S. Application Data

(60) Provisional application No. 60/343,888, filed on Dec. 27, 2001.

(51) Int. CI.7 H01Q 13/10

(52) U.S. CI 343/767; 343/768; 343/770

(58) Field of Search 343/700 MS, 767,

343/768, 770, 876

(56) References Cited

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(List continued on next page.)

FOREIGN PATENT DOCUMENTS

EP 1 158 605 Al 11/2001

FR 2 785 476 5/2000

GB 2 281 662 3/1995

GB 2 328 748 3/1999

WO 99/50929 10/1999

OTHER PUBLICATIONS

Schaffner et al, "Reconfigurable aperture . .. beam steering", Jul. 16, 2000, IEEE, pp. 321-324.*

(List continued on next page.)

Primary Examiner—Tho Phan

(74) Attorney, Agent, or Firm—Ladas & Parry LLP

(57) ABSTRACT

A slot antenna for receiving and/or transmitting a RF signal at a desired one of a plurality of different frequencies. The slot antenna includes at least one conductive sheet having a slot defined therein, the slot being longer than it is wide and having at least one end which is open. A plurality of switch members are mounted along said slot close to the open end thereof, each of said plurality of switch members acting, when closed, to couple the at least one conductive sheet on one side of said slot to the at least one conductive sheet on a second side thereof. A feed point is provided for adjacent said slot. The plurality of switch members are closable in a controlled manner to change a desired resonance frequency at which the slot antenna receives and/or transmits the RF signal.

32 Claims, 10 Drawing Sheets

4,922,263 4,958,165 5,070,340 5,158,611 5,268,696 5,287,116 5,402,134 5,406,292 5,519,408 5,532,709 5,541,614 5,581,266 5,892,485 5,905,465 5,923,303 5,929,819 5,943,016 5,949,382 5,966,096 5,966,101 6,005,521 6,008,770 6,028,561 6,034,644 6,046,655 6,061,025 6,081,239 6,118,410 6,150,989 6,188,369 6,198,438 6,198,441 6,204,819 6,218,997 6,307,519 6,373,349 6,388,631 6,392,610 6,417,807 2001/0035801

PATENT DOCUMENTS

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Schnetzer

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Grinberg ......

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Brachat

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OTHER PUBLICATIONS

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Beam Steering,” IEEE Antennas and Propagation Society International Symposium, 2000 Digest, vol. 1 of 4, pp 321-324 (Jul. 16, 2000). Balanis, C., “Aperture Antennas,” Antenna Theory, Analysis and Design, 2nd Edition, Ch. 12, pp 575-597 (1997). Balanis, C., “Microstrip Antennas,” Antenna Theory, Analysis and Design, 2nd Edition, Ch. 14, pp 722-736 (1997). Cognard, J., “Alignment of Nematic Liquid Crystals and Their Mixtures,” Mol. Cryst. Liq., Cryst. Suppl. Z, pp 1-74 (1982). Doane, J .W., et al., “Field Controlled Light Scattering from Nematic Microdroplets,” Appl. Phys. Lett., vol. 48, pp 269-271 (Jan. 1986). Jensen, M.A., et al., “EM Interaction of Handset Antennas and a Human in Personal Communications,” Proceedings of the IEEE, vol. 83, No. 1, pp 7-17 (Jan. 1995). Jensen, M.A., et al., “Performance Analysis of Antenas for Hand-held Transceivers Using FDTD,” IEEE Transactions onAntennas and Propagation, vol. 42, No. 8, pp 1106-1113 (Aug. 1994). Linardou, I., et al., “Twin Vivaldi antenna fed by coplanar waveguide,” Electronics Letters, GB, IEE Stevenage, vol. 33, No. 22, pp 1835-1837 (1997). Perini, P., et al., “Angle and Space Diversity Comparisons by the Fourier Transform Method,” IEEE Transactions on Antennas and Propagation, vol. 46, No. 6, pp 764-775 (Jul. 1998). Ramo, S., et al., Fields and Waves in Communication Electronics, 3rd Edition, Sections 9.8-9.11, pp 476-487 (1994). Sievenpiper, D., et al., “High-Impedance Electromagnetic Surfaces with a Forbidden Frequency Band,” IEEE Transactions on Microwave Theory and Techniques, vol. 47, No. 11, pp 2059-2074 (Nov. 1999). Sievenpiper, D., et al., “High-Impedance Electromagnetic Surfaces,” Ph.D. Dissertation, Dept. Of Electrical Engineering, University of California, Los Angeles, CA, 1999. Vaughan, R., “Spaced Directive Antennas for Mobile Communications by the Fourier Transform Method,” IEEE Transactions on Antennas and Propagation, vol. 48, No. 7, pp 1025-1032 (Jul. 2000). Wu, S.T., et al., “High Birefringence and Wide Nematic Range Bis-tolane Liquid Crystals,” Appl. Phys. Lett., vol. 74, No. 5, pp 344-346 (Jan. 1999).

* cited by examiner

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