# US 6,608,594 B1 · Antenna apparatus and communication system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 6,608,594 B1 - Document ID: US6608594B1 - Status: Granted - Kind: B1 - Application number: 09/680,263 - Filed: 2000-10-05 - Granted: 2003-08-19 - Earliest claimed: 1999-10-08 - Assignees: Matsushita Electric Industrial Co., Ltd. - Inventors: Joji Kane; Hirotaka Ishihara; Noboru Nomura; Shinji Naka; Michio Sasaki; Akinori Yanase; Satoshi Yamada; Hirokazu Kaidou; Katsuya Tanioka - Web page: https://patentgrep.com/patent/US6608594B1 ## CPC - H01Q 1/38: formed by a conductive layer on an insulating support {(patch antennas H01Q9/0407; microstrip dipole antennas H01Q9/065; microstrip slot antennas H01Q13/106; transmission line microstrip antennas H01Q13/206; manufacturing reflecting surfaces using insulating material for supporting the reflecting surface H01Q15/142)} - H01Q 5/378: Combination of fed elements with parasitic elements - H01Q 5/385: Two or more 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 9/0407: {Substantially flat resonant element parallel to ground plane, e.g. patch antenna (dipole H01Q9/285; monopole H01Q9/40)} - H01Q 9/065: {Microstrip dipole antennas (patch antenna H01Q9/0407)} - H01Q 19/005: {Patch antenna using one or more coplanar parasitic elements} - H01Q: ANTENNAS, i.e. RADIO AERIALS (radiators or antennas for microwave heating H05B6/72) ## Abstract An antenna apparatus having at least one radiating element. A second radiating element is located opposite a first radiating element. Earth is on the side opposite to the first radiating element with respect to the second radiating element thus opposite to the second radiating element. The second radiating element intervenes between the first radiating element and earth. Either the first or the second radiating element employs a feed terminal. ## Claims ### Claim 1 An antenna apparatus, comprising: a first radiating element located on a first side of said antenna apparatus, said first radiation element having an earth position determining tab being an end of a feed terminal; a second radiating element located opposite said first radiating element; and an earth located at a second side of said antenna apparatus that is opposite to said first side of said apparatus, said second radiating element intervening between said first radiating element and earth; wherein said first radiating element or said second radiating element is equipped with said feed terminal, and electric fields are generated at least between said first radiating element and said second radiating element, and between said second radiating element and said earth, and electric wave transmission and reception is performed. ### Claim 2 (depends on 1) The antenna apparatus according to claim 1, wherein said first radiating element is connected to said second radiating element via a prescribed inductance. ### Claim 3 (depends on 1, 2) The antenna apparatus according to either claim 1 or claim 2, wherein said first radiating element is rectilinear in shape. ### Claim 4 (depends on 1, 2) The antenna apparatus according to either claim 1 or claim 2, wherein a linear parasitic element is provided parallel to said first radiating element. ### Claim 5 (depends on 1, 2) The antenna apparatus according to either claim 1 or claim 2, wherein said first radiating element is spiral in shape. ### Claim 6 (depends on 5) The antenna apparatus according to claim 5, wherein a spiral parasitic element is provided in parallel to said first radiating element. ### Claim 7 (depends on 1, 2) The antenna apparatus according to either claim 1 or claim 2, wherein a dielectric is inserted between said first radiating element and said second radiating element. ### Claim 8 (depends on 1, 2) The antenna apparatus according to either claim 1 or claim 2, wherein said earth is an earth plate with a finite area larger than the area of said second radiating element. ### Claim 9 (depends on 1, 2) The antenna apparatus according to either claim 1 or claim 2, wherein a printed circuit board is installed between said first radiating element and said second radiating element, and said first radiating element is formed upon that printed circuit board. ### Claim 10 (depends on 1, 2) The antenna apparatus according to either claim 1 or claim 2, wherein said first radiating element or said second radiating element is supported by a support. ### Claim 11 (depends on 1, 2) The antenna apparatus according to either claim 1 or claim 2, wherein said earth forms a case housing said first radiating element and said second radiating element. ### Claim 12 (depends on 1, 2) The antenna apparatus according to either claim 1 or claim 2, wherein said first radiating element, said second radiating element, and said earth are covered by a cover, and said first radiating element and said cover are separated by a predetermined distance. ### Claim 13 (depends on 1, 2) The antenna apparatus according to either claim 1 or claim 2, comprising a pedestal unit, between said second radiating element and said earth, that is in contact with said earth but is not in contact with said second radiating element. ### Claim 14 (depends on 1) The antenna apparatus according to claim 1, comprising a feeder line for connecting said feed terminal to said first radiating element, wherein said feed terminal is provided in the vicinity of said earth position determining tab. ### Claim 15 (depends on 14) The antenna apparatus according to claim 14, wherein a reactance element is fitted to said feeder line. ### Claim 16 (depends on 14) The antenna apparatus according to claim 14, wherein said earth position determining tab is located on the same level as said first radiating element. ### Claim 17 (depends on 1) The antenna apparatus according to claim 1, wherein earth is indirectly connected to said first and second radiating elements. ### Claim 18 An antenna apparatus, comprising: a first radiating element located on a first side of said antenna apparatus, said first radiating element having an earth position determining tab being an end of a feed terminal; a second radiating element located opposite said first radiating element; and a third radiating element on a second side of said antenna apparatus that is opposite to said first side of said apparatus, said second radiating element intervening between said first radiating element and said third radiating element, wherein said first radiating element and said third radiating element are equipped with a feed terminal common to both, and electric fields are generated at least between said first radiating element and said second radiating element, and between said second radiating element and said third radiating element, and electric wave transmission and reception is performed. ### Claim 19 (depends on 18) The antenna apparatus according to claim 18, wherein said first radiating element and said third radiating element are both rectilinear in shape, or both spiral in shape. ### Claim 20 (depends on 19) The antenna apparatus according to claim 19, wherein said first radiating element and said third radiating element are both spiral in shape, and a spiral parasitic element is provided parallel to each. ### Claim 21 (depends on 18) The antenna apparatus according to claims 18, wherein a dielectric is inserted between said first radiating element and said second radiating element, and/or between said second radiating element and said third radiating element. ### Claim 22 (depends on 18) The antenna apparatus according to claim 18, comprising: a first feeder line for performing feeding to said first radiating element; and a second feeder line for performing feeding to said second radiating element, wherein common feeding is performed for said first feeder line and said second feeder line. ### Claim 23 (depends on 22) The antenna apparatus according to claim 22, wherein a reactance element is fitted to said first feeder line or said second feeder line. ### Claim 24 (depends on 22) The antenna apparatus according to claim 22, comprising a mixer, for performing common feeding used for said electric wave transmission and reception, for said first feeder line and said second feeder line. ### Claim 25 A communication system, comprising: an antenna apparatus including: a first radiating element located on a first side of said antenna apparatus said first radiating element having an earth position determining tab being an end of a feed terminal; a second radiating element located opposite said first radiating element; and an earth located at a second side of said antenna apparatus that is opposite to said first side of said apparatus, said second radiating element intervening between said first radiating element and earth, wherein said first radiating element or said second radiating element is equipped with a feed terminal, electric fields are generated at least between said first radiating element and said second radiating element, and between said second radiating element and said earth, and electric wave transmission and reception is performed; and a distributor for connecting said feed terminal to a communication apparatus for linear polarization and/or a communication apparatus for circular polarization. ### Claim 26 (depends on 25) The communication system according to claim 25, wherein earth is indirectly connected to said first and second radiating elements. ### Claim 27 A communication system, comprising: an antenna apparatus including: a first radiating element, said first radiating element having an earth position determining tab being an end of a feed terminal; a second radiating element located opposite said first radiating element; and a third radiating element that is located at a second side of said antenna apparatus that is opposite to said first side of said apparatus, said second radiating element intervening between said first radiating element and earth, wherein said first radiating element and said third radiating element are equipped with a feed terminal, electric fields are generated at least between said first radiating element and said second radiating element, and between said second radiating element and said third radiating element, and electric wave transmission and reception is performed; and a distributor for connecting said feed terminal to a communication apparatus for linear polarization and/or a communication apparatus for circular polarization.