# US 7,466,277 B2 · Antenna device 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 7,466,277 B2 - Document ID: US7466277B2 - Status: Granted - Kind: B2 - Application number: 11/954,521 - Filed: 2007-12-12 - Published: 2008-04-03 - Granted: 2008-12-16 - Earliest claimed: 2005-06-17 - Assignees: Murata Manufacturing Co., Ltd. - Inventors: Kenichi Ishizuka; Kazunari Kawahata - Web page: https://patentgrep.com/patent/US7466277B2 ## 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 1/243: {with built-in antennas} - H01Q 5/371: Branching current paths - H01Q 9/42: with folded element, the folded parts being spaced apart a small fraction of the operating wavelength - H01Q: ANTENNAS, i.e. RADIO AERIALS (radiators or antennas for microwave heating H05B6/72) ## Abstract A compact and thin antenna device can be mounted in a small area of a substrate and has a multiband capability adaptable to various applications. The antenna device includes a chip antenna, an antenna element, and a chip antenna. The chip antenna is produced by forming a radiation electrode on the surface of a dielectric base, and mounting a frequency variable circuit on the radiation electrode. Thus, it becomes possible to obtain a resonant frequency f1 of the chip antenna and further to vary the resonant frequency f1. The antenna element is produced by adding an auxiliary element to an additional radiation electrode for the chip antenna. The chip antenna includes a radiation electrode on a dielectric base and a conductive pattern. Thus, a resonant frequency f2 and a resonant frequency f3 of the antenna element and the chip antenna, respectively, can be obtained. ## Claims ### Claim 1 An antenna device comprising: a first chip antenna including a first radiation electrode and a frequency variable circuit arranged to vary an electrical length of the first radiation electrode provided on a dielectric or magnetic base mounted on an upper side of a non-ground region of a substrate; at least one antenna element including an additional radiation electrode provided on the base of the first chip antenna and an auxiliary element disposed on the upper side or an underside of the non-ground region and connected to the additional radiation electrode, and having a predetermined electrical length; and a second chip antenna including a second radiation electrode disposed on the dielectric or magnetic base mounted on the upper side or underside of the non-ground region of the substrate, and having a predetermined electrical length. ### Claim 2 (depends on 1) The antenna device according to claim 1, wherein the antenna element includes the auxiliary element disposed on the underside of the non-ground region connected to the additional radiation electrode through a through hole provided in the non-ground region. ### Claim 3 (depends on 1) The antenna device according to claim 1, wherein the number of the antenna elements is more than one, and all resonant frequencies of the plurality of antenna elements are different. ### Claim 4 (depends on 1) The antenna device according to claim 1, wherein the auxiliary element of the antenna element is a planar electrode including a conductive pattern provided in the non-ground region. ### Claim 5 (depends on 1) The antenna device according to claim 1, wherein the auxiliary element of the antenna element is a three-dimensional electrode including a supporting portion vertically disposed in the non-ground region while being connected to the additional radiation electrode, and a parallel portion extending substantially parallel to the substrate from an end of the supporting portion. ### Claim 6 (depends on 5) The antenna device according to claim 5, wherein the parallel portion of the auxiliary element is strip-shaped. ### Claim 7 (depends on 5) The antenna device according to claim 5, wherein the parallel portion of the auxiliary element has a flat plate-shaped configuration. ### Claim 8 (depends on 5) The antenna device according to claim 5, wherein the parallel portion of the auxiliary element does not extend beyond the non-ground region. ### Claim 9 (depends on 5) The antenna device according to claim 5, wherein an end of the parallel portion of the auxiliary element is an open end. ### Claim 10 (depends on 1) The antenna device according to claim 1, wherein the auxiliary element disposed on the underside of the non-ground region is disposed on the dielectric or magnetic base mounted on the underside. ### Claim 11 (depends on 1) The antenna device according to claim 1, wherein a feeding element for the second chip antenna differs from that for the first chip antenna. ### Claim 12 (depends on 1) A wireless communication apparatus comprising an antenna device according to claim 1.