# US 7,742,004 B2 · On-vehicle antenna system and electronic apparatus having the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,742,004 B2 - Document ID: US7742004B2 - Status: Granted - Kind: B2 - Application number: 11/629,073 - Filed: 2006-04-03 - Published: 2008-11-27 - Granted: 2010-06-22 - Earliest claimed: 2005-04-04 - Assignees: Panasonic Corporation - Inventors: Susumu Fukushima; Akihiro Hoshiai - Web page: https://patentgrep.com/patent/US7742004B2 ## CPC - H01Q 1/1271: {for mounting on windscreens} - H01Q 19/30: the primary active element being centre-fed and substantially straight, e.g. Yagi antenna - H01Q: ANTENNAS, i.e. RADIO AERIALS (radiators or antennas for microwave heating H05B6/72) ## Abstract An on-vehicle antenna system which offers a superior receiving performance, by suppressing reception of reflected/scattered waves coming from inside of the vehicle's cabin; these reflected/scattered waves being an adverse factor which deteriorates signal receiving performance of an antenna. The antenna system is installed at glass pane portion of a vehicle with direction (12) of the greatest radiation pattern (11) directed towards ahead (14) of the vehicle from boundary plane (10) containing power supply portion (9), while direction (13) of the smallest radiation pattern (11) towards behind (15) of the vehicle. The above-configured antenna system can suppress those waves reflected/scattered in the vehicle cabin from being received; as the result, it demonstrates improved characteristics. ## Claims ### Claim 1 An on-vehicle antenna system comprising a vehicle, an antenna for receiving digital signals installed at upper area of the vehicle's glass pane portion, and a propagation path for propagating the digital signals; wherein the propagation path undergoes an equalization processing at demodulation of the digital signals, and direction of the antenna's smallest radiation pattern and the greatest radiation pattern is directed, respectively, towards behind of the vehicle and ahead of the vehicle. ### Claim 2 (depends on 1) The on-vehicle antenna system of claim 1, the antenna wherein is performing a balanced operation. ### Claim 3 (depends on 1) The on-vehicle antenna system of claim 1, the antenna wherein is formed of dipole antenna. ### Claim 4 (depends on 1) The on-vehicle antenna system of claim 1, the antenna wherein is disposed at an antenna installation distance from the edge of metal roof board of the vehicle which is greater than 0 not greater than 0.325 wavelength. ### Claim 5 (depends on 1) The on-vehicle antenna system of claim 1, the antenna wherein is formed of Yagi antenna. ### Claim 6 (depends on 5) The on-vehicle antenna system of claim 5, the Yagi antenna wherein is formed of a plurality of antenna elements of ¼ wavelength disposed perpendicular to the pillar which is making contact with the front windshield glass. ### Claim 7 (depends on 1) The on-vehicle antenna system of claim 1, the antenna wherein is formed of logarithmic period dipole antenna. ### Claim 8 (depends on 1) The on-vehicle antenna system of claim 1, the antenna wherein is an array antenna formed of two or more number of dipole antennas disposed in parallel. ### Claim 9 (depends on 8) The on-vehicle antenna system of claim 8, the array antenna wherein is formed of a plurality of ¼ wavelength antenna elements disposed perpendicular to the pillar which is making contact with the front windshield glass. ### Claim 10 (depends on 1) The on-vehicle antenna system of claim 1, the antenna wherein is formed of microstrip antenna, reverse F antenna or reverse L antenna. ### Claim 11 (depends on 1) The on-vehicle antenna system of claim 1 comprising a transparent insulating film and an antenna conductor disposed on the film, affixed at the vehicle's glass pane portion. ### Claim 12 (depends on 11) The on-vehicle antenna system of claim 11, the antenna conductor wherein is formed by means of a printing process. ### Claim 13 (depends on 11) The on-vehicle antenna system of claim 11, the film wherein is affixed to the glass pane surface from the inside of cabin. ### Claim 14 (depends on 1) The on-vehicle antenna system of claim 1, the antenna conductor wherein is provided drawn on the vehicle's glass pane. ### Claim 15 (depends on 1) The on-vehicle antenna system of claim 1, disposed within 30 mm from the boundary of metal edge of vehicle's roof board and glass pane, either on the surface or in the glass pane. ### Claim 16 (depends on 1) The on-vehicle antenna system of claim 1, wherein the average width value of antenna element locating within 30 mm from the boundary of metal edge of vehicle's roof board and front windshield glass, either on the surface or in the glass pane, is greater than the average width value of that locating away from the boundary of metal edge of vehicle's roof board and front windshield glass, either on the surface or in the glass pane, for more than 30 mm. ### Claim 17 (depends on 1) The on-vehicle antenna system of claim 1, the antenna wherein is formed of ¼ wavelength monopole antenna disposed perpendicular to the pillar which is making contact with the glass pane. ### Claim 18 (depends on 1) The antenna system of claim 1, further comprising a power supply portion, a first conductor element of a right-angled triangle link connected with the power supply portion, and a second conductor element which is line-symmetrical to the first conductor element with respect to a straight line which contains the power supply portion; wherein the first conductor element having a first right-angled vertex, a first power supply vertex connected with the power supply portion, and a first acute angle vertex other than those first right-angled vertex and first power supply vertex; the second conductor element having a second right-angled vertex, a second power supply vertex connected with the power supply portion, and a second acute angle vertex other than those second right-angled vertex and second power supply vertex; and a first parallel side of the first conductor element containing the first right-angled vertex and the first power supply vertex and a second parallel side of the second conductor element containing the second right-angled vertex and the second power supply vertex are parallel to each other. ### Claim 19 (depends on 18) The antenna system of claim 18, the angle wherein at the first acute angle vertex and at the second acute angle vertex is within a range between 12 degrees to 48 degrees. ### Claim 20 (depends on 19) The antenna system of claim 19, the angle wherein at the first acute angle vertex and at the second acute angle vertex is within a range between 20 degrees to 40 degrees. ### Claim 21 (depends on 20) The antenna system of claim 20, the angle wherein at the first acute angle vertex and at the second acute angle vertex is 30 degrees. ### Claim 22 (depends on 18) The antenna system of claim 18, further comprising a first parallel line which is connected at one end with the first acute angle vertex and parallel to the first parallel side, a second parallel line which is connected at one end with the second acute angle vertex and parallel to the second parallel side, and a perpendicular line which connects the other end of the first parallel line and the other end of the second parallel line and existing perpendicular to the first parallel side and the second parallel side. ### Claim 23 (depends on 22) The antenna system of claim 22, further comprising a third oblique side which is connected with the connection point of the first parallel line and the perpendicular line, and a fourth oblique side which is connected with the connection point of the second parallel line and the perpendicular line, wherein the perpendicular line, the third oblique side and the fourth oblique side forms an isosceles triangle employing the third oblique side and the fourth oblique side as the triangle's oblique sides. ### Claim 24 An on-vehicle antenna system comprising a vehicle, an antenna for receiving digital signals installed at upper area of the vehicle's glass pane portion, and a propagation path for propagating the digital signals; wherein the propagation path undergoes an equalization processing at demodulation of the digital signals, and direction of the antenna's smallest radiation pattern and the greatest radiation pattern is directed, respectively, towards inside of the vehicle's cabin and outside of the cabin. ### Claim 25 (depends on 24) The on-vehicle antenna system of claim 24, the glass pane portion wherein is the vehicle's side glass. ### Claim 26 (depends on 24) The on-vehicle antenna system of claim 24, the antenna wherein is performing a balanced operation. ### Claim 27 (depends on 24) The on-vehicle antenna system of claim 24, the antenna wherein is formed of dipole antenna. ### Claim 28 (depends on 24) The on-vehicle antenna system of claim 24, the antenna wherein is disposed at an antenna installation distance from the edge of metal roof board of the vehicle which is greater than 0 not greater than 0.325 wavelength. ### Claim 29 (depends on 24) The on-vehicle antenna system of claim 24, the antenna wherein is formed of Yagi antenna. ### Claim 30 (depends on 29) The on-vehicle antenna system of claim 29, the Yagi antenna wherein is formed of a plurality of antenna elements of ¼ wavelength disposed perpendicular to the pillar which is making contact with the front windshield glass. ### Claim 31 (depends on 24) The on-vehicle antenna system of claim 24, the antenna wherein is formed of logarithmic period dipole antenna. ### Claim 32 (depends on 24) The on-vehicle antenna system of claim 24, the antenna wherein is an array antenna formed of two or more number of dipole antennas disposed in parallel. ### Claim 33 (depends on 32) The on-vehicle antenna system of claim 32, the array antenna wherein is formed of a plurality of ¼ wavelength antenna elements disposed perpendicular to the pillar which is making contact with the front windshield glass. ### Claim 34 (depends on 24) The on-vehicle antenna system of claim 24, the antenna wherein is formed of microstrip antenna, reverse F antenna or reverse L antenna. ### Claim 35 (depends on 24) The on-vehicle antenna system of claim 24 comprising a transparent insulating film and an antenna conductor disposed on the film, affixed at the vehicle's glass pane portion. ### Claim 36 (depends on 35) The on-vehicle antenna system of claim 35, the antenna conductor wherein is formed by means of a printing process. ### Claim 37 (depends on 35) The on-vehicle antenna system of claim 35, the film wherein is affixed to the glass pane surface from the inside of cabin. ### Claim 38 (depends on 24) The on-vehicle antenna system of claim 24, the antenna conductor wherein is provided drawn on the vehicle's glass pane. ### Claim 39 (depends on 24) The on-vehicle antenna system of claim 24, disposed within 30 mm from the boundary of metal edge of vehicle's roof board and glass pane, either on the surface or in the glass pane. ### Claim 40 (depends on 24) The on-vehicle antenna system of claim 24, wherein the average width value of antenna element locating within 30 mm from the boundary of metal edge of vehicle's roof board and front windshield glass, either on the surface or in the glass pane, is greater than the average width value of that locating away from the boundary of metal edge of vehicle's roof board and front windshield glass, either on the surface or in the glass pane, for more than 30 mm. ### Claim 41 (depends on 24) The on-vehicle antenna system of claim 24, the antenna wherein is formed of ¼ wavelength monopole antenna disposed perpendicular to the pillar which is making contact with the glass pane. ### Claim 42 An on-vehicle antenna system comprising a diversity antenna, which diversity antenna being formed with at least either one of a first on-vehicle antenna system disposed at the vehicle's glass pane portion with direction of the smallest radiation pattern directed towards behind of the vehicle and a second on-vehicle antenna system disposed at the vehicle's glass pane portion with direction of the smallest radiation pattern directed towards inside of the vehicle cabin with respect to the glass pane. ### Claim 43 An on-vehicle antenna system comprising a diversity antenna, which diversity antenna being formed of a first on-vehicle antenna having a radiation pattern with direction of the greatest radiation pattern directed towards ahead or behind of the vehicle while the smallest radiation pattern towards inside of the vehicle's cabin, and a second on-vehicle antenna having a radiation pattern with direction of the greatest radiation pattern directed perpendicular to the vehicle's front—rear direction, or across both sides of the vehicle, while the smallest radiation pattern along the vehicle's front—rear direction. ### Claim 44 (depends on 43) The on-vehicle antenna system of claim 43 comprising a diversity antenna, which diversity antenna being formed of a first on-vehicle antenna system disposed at the vehicle's front windshield glass with direction of the greatest radiation pattern directed towards ahead of the vehicle while the smallest radiation pattern towards behind of the vehicle, and a monopole antenna disposed at the upper area of the vehicle's front windshield glass or the upper area of the vehicle's rear windshield glass with the power supply portion at the vehicle's roof board side. ### Claim 45 (depends on 43) The on-vehicle antenna system of claim 43 comprising a diversity antenna, which diversity antenna being formed of a first on-vehicle antenna system disposed at the vehicle's front windshield glass with direction of the greatest radiation pattern directed towards ahead of the vehicle while the smallest radiation pattern towards behind of the vehicle, and a dipole antenna disposed perpendicular to the border of vehicle's roof board and front windshield glass or rear glass. ### Claim 46 (depends on 43) The on-vehicle antenna system of claim 43 comprising a diversity antenna, which diversity antenna being formed of a patch antenna disposed at the vehicle's rear glass with direction of the greatest radiation pattern directed towards outside of the vehicle cabin with respect to the glass pane while the smallest radiation pattern towards inside of the vehicle cabin with respect to the glass pane, and a monopole antenna disposed at the upper area of the vehicle's front windshield glass or the upper area of rear glass with the power supply portion at the vehicle's roof board side. ### Claim 47 (depends on 43) The on-vehicle antenna system of claim 43 comprising a diversity antenna, which diversity antenna being formed of a patch antenna disposed at the vehicle's rear glass with direction of the greatest radiation pattern directed towards outside of the cabin with respect to the glass pane while the smallest radiation pattern towards inside of the cabin with respect to the glass pane, and a dipole antenna disposed perpendicular to the border of vehicle's roof board and front windshield glass or rear glass. ### Claim 48 An electronic apparatus comprising at least either one of a first on-vehicle antenna system installed at glass pane portion of a vehicle with direction of the smallest radiation pattern directed towards behind of the vehicle and a second on-vehicle antenna system installed at the vehicle's glass pane portion with direction of the smallest radiation pattern directed towards inside of the vehicle cabin with respect to the glass pane. ### Claim 49 (depends on 48) A television receiver comprising the electronic apparatus of claim 48. ### Claim 50 (depends on 48) A radio receiver comprising the electronic apparatus of claim 48. ### Claim 51 (depends on 48) A transmitting/receiving unit of a portable telephone system, comprising the electronic apparatus of claim 48.