# US 7,411,552 B2 · Grounded antenna for a wireless communication device and method > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,411,552 B2 - Document ID: US7411552B2 - Status: Granted - Kind: B2 - Application number: 11/506,407 - Filed: 2006-08-17 - Published: 2007-07-26 - Granted: 2008-08-12 - Earliest claimed: 2000-07-18 - Assignees: Mineral Lassen LLC - Inventors: Patrick F King; Ian J Forster - Web page: https://patentgrep.com/patent/US7411552B2 ## CPC - H01Q 21/28: Combinations of substantially independent non-interacting antenna units or systems {(multiple beam H01Q25/00)} - B65D 5/4233: {Cards, coupons, labels or the like formed separately from the container or lid} - B65D 25/205: {Means for the attachment of labels, cards, coupons or the like; (cards or coupons for the other types of rigid or semi-rigid containers B65D25/36 takes precedence)} - B65D 33/004: {Information or decoration elements, e.g. level indicators, detachable tabs or coupons} - G06K 19/04: characterised by the shape - G06K 19/0716: {at least one of the integrated circuit chips comprising a sensor or an interface to a sensor} - G06K 19/07749: {the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card} - G06K 19/07771: {the record carrier comprising means for minimising adverse effects on the data communication capability of the record carrier, e.g. minimising Eddy currents induced in a proximate metal or otherwise electromagnetically interfering object} - G06K 19/07798: {part of the antenna or the integrated circuit being adapted for rupturing or breaking, e.g. record carriers functioning as sealing devices for detecting not-authenticated opening of containers (electronic seals G09F3/03)} - H01Q 1/22: by structural association with other equipment or articles - H01Q 1/24: with receiving set - H01Q 1/3241: {particular used in keyless entry systems} - H01Q 5/378: Combination of fed elements with parasitic elements - H01Q 5/40: Imbricated or interleaved structures; Combined or electromagnetically coupled arrangements, e.g. comprising two or more non-connected fed radiating elements - H01Q 9/04: Resonant antennas - H01Q 9/065: {Microstrip dipole antennas (patch antenna H01Q9/0407)} - H01Q 9/16: with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole (H01Q9/44 takes precedence) - H01Q 13/106: {Microstrip slot antennas (patch antenna elements H01Q9/0407)} - B65D 2203/10: Transponders - G11B 23/286: {Antitheft arrangements, e.g. Electronic Article Surveillance [EAS] tags} - H01Q: ANTENNAS, i.e. RADIO AERIALS (radiators or antennas for microwave heating H05B6/72) - B65D: CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES - G06K: GRAPHICAL DATA READING (image or video recognition or understanding G06V); PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS - G11B: INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER (recording measured values in a way that does not require playback through a transducer G01D9/00; recording or playback apparatus using mechanically marked tape, e.g. punched paper tape, or using unit records, e.g. punched or magnetically marked cards G06K; transferring data from one type of record carrier to another G06K1/18; circuits for coupling output of reproducer to radio receiver H04B1/20; gramophone pick-ups or like acoustic electromechanical transducers or circuits therefor H04R) ## Abstract A wireless communication device includes an antenna for wireless communication with a remote interrogator. Several embodiments are disclosed to increase the options available to designers of wireless communication devices. In some embodiments, the antenna is a quarter wavelength long with one end of the antenna being grounded to provide desired impedance matching characteristics. The position of the ground plane relative to the antenna is also varied between embodiments. The connection from a wireless communication chip to the antenna is also varied between embodiments to provide alternate structures. ## Claims ### Claim 1 A wireless communication device, comprising: a substrate; a ground plane positioned on one side of the substrate; a wireless communication chip electrically connected to said ground plane and proximate thereto; an antenna having a first end and a second end, said first end electrically connected to said ground plane; and said second end comprising an open circuit. ### Claim 2 (depends on 1) The wireless communication device of claim 1, wherein said wireless communication chip is positioned on a side of the substrate opposite that of said ground plane. ### Claim 3 (depends on 2) The wireless communication device of claim 2, wherein said wireless communication chip is generally parallel to said antenna. ### Claim 4 (depends on 3) The wireless communication device of claim 3, wherein said wireless communication chip is electrically connected to said ground plane by a chip grounding line and wherein said wireless communication chip is capacitively coupled to said antenna by a non-conductive material interposed between a feed line and said antenna, said feed line coupled to said chip grounding line. ### Claim 5 (depends on 2) The wireless communication device of claim 2, wherein said wireless communication chip is generally perpendicular to said antenna. ### Claim 6 (depends on 1) The wireless communication device of claim 1, wherein said antenna is a quarter wavelength long. ### Claim 7 (depends on 1, 6) The wireless communication device of claims 1 or 6, wherein said ground plane is positioned on the same side of the substrate as the wireless communication chip. ### Claim 8 (depends on 1) The wireless communication device of claim 1, wherein said substrate comprises a dielectric material. ### Claim 9 (depends on 1) The wireless communication device of claim 1, wherein said antenna is positioned on a side of the substrate opposite that of said ground plane. ### Claim 10 (depends on 9) The wireless communication device of claim 9, wherein said first end of said antenna is electrically connected to said ground plane by a conductive strip, said conductive strip coupled to said antenna and said ground plane and positioned around an edge of said substrate. ### Claim 11 (depends on 1) The wireless communication device of claim 1, wherein said antenna is positioned in the same plane as said ground plane. ### Claim 12 (depends on 1) The wireless communication device of claim 1, wherein said wireless communication chip is capacitively coupled to said antenna. ### Claim 13 (depends on 12) The wireless communication device of claim 12, wherein said wireless communication chip is capacitively coupled to said antenna by a non-conductive adhesive being interposed between a feed line extending from said wireless communication chip and said antenna. ### Claim 14 (depends on 12) The wireless communication device of claim 12, wherein said wireless communication device is capacitively coupled to said antenna by at least one inter digital capacitive coupling stub. ### Claim 15 (depends on 14) The wireless communication device of claim 14, wherein said at least one inter digital capacitive coupling stub extends into the area of said antenna. ### Claim 16 (depends on 14, 15) The wireless communication device of claims 14 or 15, wherein said at least one inter digital capacitive coupling stub comprises a plurality of inter digital capacitive coupling stubs. ### Claim 17 (depends on 1) The wireless communication device of claim 1, wherein said wireless communication chip is separated from said antenna by a non-conductive adhesive. ### Claim 18 (depends on 1) The wireless communication device of claim 1, wherein said wireless communication chip is reactively coupled to said antenna by at least one inter digital capacitive coupling stub. ### Claim 19 (depends on 1) The wireless communication device of claim 1, wherein said antenna is a patch antenna. ### Claim 20 (depends on 1) The wireless communication device of claim 1, wherein said wireless communication chip is directly coupled to said ground plane. ### Claim 21 (depends on 1) The wireless communication device of claim 1, wherein said wireless communication chip is reactively coupled to said ground plane. ### Claim 22 (depends on 1) The wireless communication device of claim 1, wherein said antenna comprises a first antenna and said device further comprising a second antenna operating at a second frequency, said second antenna electrically coupled to said wireless communication chip. ### Claim 23 (depends on 22) The wireless communication device of claim 22, wherein said second antenna comprises a tab capacitively coupling said wireless communication chip to said first antenna. ### Claim 24 A wireless communication device comprising: a substrate; a wireless communication chip positioned on said substrate; a ground plane positioned on said substrate; and an antenna electrically coupled to said wireless communication chip and electrically coupled at one end to said ground plane. ### Claim 25 (depends on 24) The wireless communication device of claim 24, wherein said antenna is electrically coupled to said ground plane by a low impedance resistive connection. ### Claim 26 (depends on 24) The wireless communication device of claim 24, wherein said antenna is electrically coupled to said ground plane by a low impedance reactive connection. ### Claim 27 (depends on 24) The wireless communication device of claim 24, wherein said antenna is directly electrically coupled to said ground plane. ### Claim 28 (depends on 24) The wireless communication device of claim 24, wherein said antenna is indirectly electrically coupled to said ground plane. ### Claim 29 (depends on 24) The wireless communication device of claim 24, wherein said antenna comprises a first antenna and said device further comprising a second antenna operating at a second frequency, said second antenna electrically coupled to said wireless communication chip. ### Claim 30 (depends on 29) The wireless communication device of claim 29, wherein said second antenna comprises a tab capacitively coupling said wireless communication chip to said first antenna. ### Claim 31 A wireless communication device comprising: a substrate; a wireless communication chip positioned on said substrate; a ground plane positioned on said substrate; a first antenna operating at a first operating frequency and electrically coupled to said wireless communication chip by a coupling element, said first antenna electrically coupled at one end to said ground plane; and said coupling element acting as a second antenna at a second operating frequency. ### Claim 32 A wireless communication device comprising: a substrate; a wireless communication chip positioned on said substrate; a ground plane positioned on said substrate; and an antenna electrically coupled to said wireless communication chip by a coupling element and electrically coupled at one end to said ground plane. ### Claim 33 (depends on 32) The wireless communication device of claim 32 wherein said coupling element comprises a surface mount capacitor. ### Claim 34 A wireless communication device comprising: a substrate; a wireless communication chip positioned on said substrate; a ground plane positioned on said substrate; a first antenna electrically coupled to said wireless communication chip and electrically shorted at one end to said ground plane; and a second antenna operating at a frequency distinct from said first antenna's operating frequency, said second antenna is configured to act as a feed line to capacitively couple said first antenna to said wireless communication chip. ### Claim 35 (depends on 34) The wireless communication device of claim 34 wherein said first antenna is configured to communicate at a single operating frequency. ### Claim 36 (depends on 34) The wireless communication device of claim 34 wherein said second antenna is configured to act as a feed line at UHF, but act as an antenna at microwave frequencies.