Glass mounted antenna for car radio
First Claim
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1. A glass mounted antenna for a car radio comprising:
- a first resonant circuit comprising a capacitor in a coil provided on one side of said glass, said first resonant circuit being resonant at an FM broadcast frequency band;
a first ring-formed capacitor electrode provided on said one side of said window glass;
an antenna means electrically coupled to said first resonant circuit and said first ring-formed capacitor electrode;
a second resonant circuit comprising a capacitor and a coil provided on another side of said glass opposing said first resonant circuit, said second resonant circuit being resonant at said FM broadcast frequency band;
a second ring-formed capacitor electrode provided on said another side of said glass opposing said first ring-formed capacitor element;
a band-pass filter means for passing signals in said FM broadcast frequency band coupled to said second resonant circuit; and
an AM impedance converter means for converting a high impedance at an AM broadcast frequency band to a low impedance at said AM broadcast frequency band coupled to said second ring-formed capacitor electrode;
whereby signals in said FM broadcast frequency band are passed through said glass by said first and second resonant circuits and to a receiver of said car radio by said band-pass filter and signals at said AM broadcast frequency band are passed through said glass by said first and second ring-formed capacitor electrodes and through said AM impedance converter means to said receiver of said car radio.
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Accused Products
Abstract
A glass mounted antenna for car radio including an antenna element having a length that is in a resonant or non-resonant state with respect to FM frequencies, resonance circuits made up with spiral coils and capacitors so as to resonate in the FM band, a band-pass filter that passes only FM signals and no AM signals, and an AM impedance converter having an active element converting high-impedance signals into low impedance signals.
29 Citations
3 Claims
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1. A glass mounted antenna for a car radio comprising:
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a first resonant circuit comprising a capacitor in a coil provided on one side of said glass, said first resonant circuit being resonant at an FM broadcast frequency band; a first ring-formed capacitor electrode provided on said one side of said window glass; an antenna means electrically coupled to said first resonant circuit and said first ring-formed capacitor electrode; a second resonant circuit comprising a capacitor and a coil provided on another side of said glass opposing said first resonant circuit, said second resonant circuit being resonant at said FM broadcast frequency band; a second ring-formed capacitor electrode provided on said another side of said glass opposing said first ring-formed capacitor element; a band-pass filter means for passing signals in said FM broadcast frequency band coupled to said second resonant circuit; and an AM impedance converter means for converting a high impedance at an AM broadcast frequency band to a low impedance at said AM broadcast frequency band coupled to said second ring-formed capacitor electrode; whereby signals in said FM broadcast frequency band are passed through said glass by said first and second resonant circuits and to a receiver of said car radio by said band-pass filter and signals at said AM broadcast frequency band are passed through said glass by said first and second ring-formed capacitor electrodes and through said AM impedance converter means to said receiver of said car radio. - View Dependent Claims (2, 3)
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Specification
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Current AssigneeHarada Kogyo KK
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Original AssigneeHarada Kogyo KK
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InventorsKawasaki, Moriyoshi, Nakase, Kazuhiko
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Primary Examiner(s)Wimer, Michael C.
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Assistant Examiner(s)LE, HOANGANH T
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Application NumberUS07/543,709Time in Patent Office658 DaysField of Search343/715, 343/713, 343/711, 455/286, 455/297, 333/24 C, 333/32US Class Current343/715CPC Class CodesH01Q 1/1285 with capacitive feeding thr...H01Q 11/083 Tapered helical aerials, e....
