# US 10,374,285 B2 · Antenna and wireless communication apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,374,285 B2 - Document ID: US10374285B2 - Status: Granted - Kind: B2 - Application number: 14/910,348 - Filed: 2014-07-23 - Published: 2016-06-30 - Granted: 2019-08-06 - Earliest claimed: 2013-08-27 - Assignees: NEC Platforms, Ltd. - Applicants: NEC Platforms, Ltd. - Inventors: Ken Miura - Web page: https://patentgrep.com/patent/US10374285B2 ## CPC - H01Q 1/243: {with built-in antennas} - H01Q 1/2291: {used in Bluetooth® or Wi-Fi® devices of Wireless Local Area Networks [WLAN] (H01Q1/241 takes precedence; WLAN in general H04W)} - 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 1/48: Earthing means; Earth screens; Counterpoises - H01Q 1/52: Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure (absorbing means H01Q17/00) - H01Q 1/521: {reducing the coupling between adjacent antennas} - H01Q 9/0421: {with a shorting wall or a shorting pin at one end of the element (H01Q9/0414 takes precedence)} - H01Q 19/00: Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic {(combination of horns with slotted waveguide array H01Q13/0233)} - H01Q 21/28: Combinations of substantially independent non-interacting antenna units or systems {(multiple beam H01Q25/00)} - H01Q: ANTENNAS, i.e. RADIO AERIALS (radiators or antennas for microwave heating H05B6/72) ## Abstract Provided is an antenna capable of maintaining excellent antenna characteristics even in a case where the antenna cannot be disposed at a desired position or a case where a plurality of antennas are disposed in a single apparatus. This antenna is characterized by being provided with: a printed wiring board; an antenna circuit which is disposed in a predetermined end portion of the printed wiring board and sends and receives radio waves of wavelength λ; and a series resonance circuit disposed at a position in the predetermined end portion of the printed wiring board, the position being separated from the antenna circuit by a distance depending on the wavelength λ. The antenna is also characterized by being arranged such that the extending direction of the predetermined end portion is perpendicular to the direction of radio wave reception. ## Claims ### Claim 1 An antenna comprising: a printed wiring board having a conductive layer having a primary portion and an end portion disposed at an end of the primary portion, the primary portion and the end portion conductively connected within the conductive layer; an antenna circuit which is disposed in the end portion and which sends and receives radio waves of wavelength λ; a series resonance circuit disposed at a position in the predetermined end portion of the conductive layer in the printed wiring board, the position being separated from the antenna circuit by a distance depending on the wavelength λ, the series resonance circuit and the antenna circuit cooperatively suppressing current flowing in the conductive layer, the antenna being arranged such that the extending direction of the predetermined end portion becomes perpendicular to the direction of receiving the radio waves, wherein the predetermined end portion of the printed wiring board is formed to have a length approximately equal to the wavelength λ; the antenna circuit is disposed in the predetermined end portion and at approximately λ/4 height from an installation surface thereof; and the series resonance circuit is disposed in the predetermined end portion and at approximately λ/2 height from the installation surface thereof. ### Claim 2 (depends on 1) The antenna according to claim 1, wherein the series resonance circuit is a split ring resonator fabricated into an approximately C-shaped form by cutting part of a metal ring. ### Claim 3 (depends on 1) The antenna according to claim 1, wherein the printed wiring board comprises a dielectric layer, a first conductive layer arranged on one surface of the dielectric layer and a second conductive layer arranged on the other surface of the dielectric layer, and the antenna circuit is a split ring resonator antenna composed of: a first split ring part having an approximately C-shaped form, which is formed in the first conductive layer; a second split ring part having an approximately C-shaped form, which is formed in the second conductive layer and faces the first split ring part; a conductive via which electrically connects the first split ring part with the second split ring part; and a power feeder with its one end connected to the conductive vias and other end being a point from which power is fed. ### Claim 4 (depends on 1) The antenna according to claim 1, further comprising a second antenna circuit disposed on the opposite side to the antenna circuit with respect to the series resonance circuit, in the predetermined end portion of the printed wiring board. ### Claim 5 (depends on 4) The antenna according to claim 4, wherein the second antenna circuit is disposed in the predetermined end portion of the printed wiring board and at approximately (¾)λ height from the installation surface thereof. ### Claim 6 (depends on 4) The antenna according to claim 4, wherein the second antenna circuit is a split ring resonator antenna. ### Claim 7 (depends on 1) The antenna according to claim 1, further comprising a second antenna circuit disposed on the opposite side to the antenna circuit with respect to the series resonance circuit, in the predetermined end portion of the printed wiring board, wherein the antenna circuit and the second antenna circuit are inverted L-shaped antennas. ### Claim 8 (depends on 7) The antenna according to claim 7, wherein the second antenna circuit is disposed in the predetermined end portion of the printed wiring board and at approximately (¾)λ height from the installation surface thereof. ### Claim 9 (depends on 1) A wireless communication apparatus comprising: a wireless IC; and an antenna according to claim 1 which sends radio waves of wavelength λ received from an external apparatus to the wireless IC and sends radio waves of wavelength λ received from the wireless IC to the external apparatus, the wireless communication apparatus being arranged to face the external apparatus in an XY plane. ### Claim 10 (depends on 1) The antenna according to claim 1, further comprising a second antenna circuit disposed on the opposite side to the antenna circuit with respect to the series resonance circuit, in the predetermined end portion of the printed wiring board. ### Claim 11 (depends on 10) The antenna according to claim 10, wherein the second antenna circuit is disposed in the predetermined end portion of the printed wiring board and at approximately (¾)λ, height from the installation surface thereof. ### Claim 12 (depends on 1) The antenna according to claim 1, further comprising a second antenna circuit disposed on the opposite side to the antenna circuit with respect to the series resonance circuit, in the predetermined end portion of the printed wiring board, wherein the antenna circuit and the second antenna circuit are inverted L-shaped antennas. ### Claim 13 (depends on 12) The antenna according to claim 12, wherein the second antenna circuit is disposed in the predetermined end portion of the printed wiring board and at approximately (¾)λ height from the installation surface thereof. ### Claim 14 (depends on 1) The antenna according to claim 1, wherein the antenna circuit is disposed in the predetermined end portion and at a position approximately λ/4 beneath a top end of the printed wiring board; and the series resonance circuit is disposed in the predetermined end portion and at a position approximately λ/2 beneath the top end of the printed wiring board. ### Claim 15 (depends on 1) The antenna according to claim 1, wherein the antenna circuit is disposed in the predetermined end portion and at a position approximately λ/4 above a bottom end of the printed wiring board; and the series resonance circuit is disposed in the predetermined end portion and at approximately λ/2 above the bottom end of the printed wiring board. ### Claim 16 (depends on 5) The antenna according to claim 5, wherein the antenna circuit is disposed in the predetermined end portion and at approximately λ/4 above a bottom end of the printed wiring board; and the second antenna circuit is disposed in the predetermined end portion and at approximately λ/4 beneath a top end of the printed wiring board. ### Claim 17 (depends on 5) The antenna according to claim 5, wherein the antenna circuit is disposed in the predetermined end portion and at approximately λ/4 beneath a top end of the printed wiring board; and the second antenna circuit is disposed in the predetermined end portion and at approximately λ/4 above a bottom end of the printed wiring board.