Dual-frequency antenna
First Claim
1. An antenna for the transmission and reception of radio-frequency oscillation in two frequency ranges, comprising:
- a cylindrical coil conductor forming a helical antenna and having a longitudinal axis, said cylindrical coil conductor including a first portion and a second portion, said first and second portions being disposed along said longitudinal axis; and
a second antenna element fixedly connected to said cylindrical coil conductor at a junction disposed between said first and second portions of said cylindrical coil conductor, said second antenna element being oriented in the same direction from said junction as said second portion of said cylindrical coil conductor and a physical length of said second antenna element in said direction is substantially the same as a physical length of said second portion is said direction.
2 Assignments
0 Petitions
Accused Products
Abstract
An antenna structure for two frequency ranges including two antenna elements. The first antenna element is a cylindrical coil conductor (2) forming a helical antenna and includes in the direction of its longitudinal axis, a first portion (2a) and a second portion (2b). The second antenna element (3; 6) is connected to the cylindrical coil conductor by a fixed connection at a junction (2c) lying between the first and second portions of the first antenna element. The second antenna element may be for example, a filamentous conductor (5a), a conductive pattern (5) formed on the surface of an insulating plate (3), or a small-diameter helical antenna (6). The first operating frequency is dependent on the combined electrical length of the portions of the first antenna element while the second operating frequency is dependent on the combined electrical length of the lower part of the first antenna element and the second antenna element. The bandwidth of the operating frequencies is dependent on the positioning of the junction in the first antenna element.
87 Citations
35 Claims
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1. An antenna for the transmission and reception of radio-frequency oscillation in two frequency ranges, comprising:
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a cylindrical coil conductor forming a helical antenna and having a longitudinal axis, said cylindrical coil conductor including a first portion and a second portion, said first and second portions being disposed along said longitudinal axis; and a second antenna element fixedly connected to said cylindrical coil conductor at a junction disposed between said first and second portions of said cylindrical coil conductor, said second antenna element being oriented in the same direction from said junction as said second portion of said cylindrical coil conductor and a physical length of said second antenna element in said direction is substantially the same as a physical length of said second portion is said direction. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 28, 35)
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2. An antenna for the transmission and reception of radio-frequency oscillation in two frequency ranges, comprising:
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a cylindrical coil conductor forming a helical antenna and having a longitudinal axis, said cylindrical coil conductor including a first portion and a second portion, said first and second portions being disposed along said longitudinal axis; and a second antenna element fixedly connected to said cylindrical coil conductor at a junction disposed between said first and second portions of said cylindrical coil conductor, said second antenna having an end disposed proximate the junction, said second antenna element being oriented in the same direction from said junction as said second portion of said cylindrical coil conductor, and a physical length of said second antenna element in said direction is substantially the same as a physical length of said second portion is said direction.
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3. An antenna for the transmission and reception of radio-frequency oscillation in two frequency ranges, comprising:
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a cylindrical coil conductor forming a helical antenna and having a longitudinal axis, said cylindrical coil conductor including a first portion and a second portion, said first and second portions being disposed along said longitudinal axis; and a second antenna element fixedly connected to said cylindrical coil conductor at a junction disposed between said first and second portions of said cylindrical coil conductor, and the first portion of said cylindrical coil conductor having a first end as a feed point connection of said antenna, said second antenna element being oriented in the same direction from said junction as said second portion of said cylindrical coil conductor, and a physical length of said second antenna element in said direction is substantially the same as a physical length of said second portion is said direction.
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4. An antenna for the transmission and reception of radio-frequency oscillation at a first operating frequency and a second operating frequency different from said first operating frequency, comprising:
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a cylindrical coil conductor forming a helical antenna and having a longitudinal axis, said cylindrical coil conductor including a first portion and a second portion, said first and second portions being disposed along said longitudinal axis and each having an electrical length, wherein the first operating frequency is dependent on the combined electrical length of said first and second portions; and a second antenna element having an electrical length, said second antenna element being fixedly connected to said cylindrical coil conductor at a junction disposed between said first and second portions of said cylindrical coil conductor; and
the second operating frequency is dependent on the combined electrical lengths of the first portion and said second antenna element, said second antenna element being oriented in the same direction from said junction as said second portion of said cylindrical coil conductor, and a physical length of said second antenna element in said direction is substantially the same as a physical length of said second portion is said direction. - View Dependent Claims (5, 6, 7)
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18. An antenna for the transmission and reception of radio-frequency oscillation in two frequency ranges, comprising:
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a cylindrical coil conductor forming a helical antenna and having a longitudinal axis, said cylindrical coil conductor including a first portion and a second portion, said first and second portions being disposed along said longitudinal axis; and a second antenna element fixedly connected to said cylindrical coil conductor at a junction disposed between said first and second portions of said cylindrical coil conductor, said second antenna element including an insulating plate and an electrically conductive pattern formed on a surface thereof, said electrically conductive pattern comprises, as a radiating antenna element, a conductor portion having at least one bend. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27)
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29. An antenna for the transmission and reception of radio-frequency oscillation in two frequency ranges, comprising:
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a cylindrical coil conductor forming a helical antenna and having a longitudinal axis, said cylindrical coil conductor including a first portion and a second portion, said first and second portions being disposed along said longitudinal axis; and a second antenna element fixedly connected to said cylindrical coil conductor at a junction disposed between said first and second portions of said cylindrical coil conductor, said second antenna having an end disposed proximate the junction, said second antenna element including an insulating plate and an electrically conductive pattern formed on a surface thereof, said electrically conductive pattern comprises, as a radiating antenna element, a conductor portion having at least one bend.
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30. An antenna for the transmission and reception of radio-frequency oscillation in two frequency ranges, comprising:
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a cylindrical coil conductor forming a helical antenna and having a longitudinal axis, said cylindrical coil conductor including a first portion and a second portion, said first and second portions being disposed along said longitudinal axis; and a second antenna element fixedly connected to said cylindrical coil conductor at a junction disposed between said first and second portions of said cylindrical coil conductor, and the first portion of said cylindrical coil conductor having a first end as a feed point connection of said antenna, said second antenna element including an insulating plate and an electrically conductive pattern formed on a surface thereof, said electrically conductive pattern comprises, as a radiating antenna element, a conductor portion having at least one bend.
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31. An antenna for the transmission and reception of radio-frequency oscillation at a first operating frequency and a second operating frequency different from said first operating frequency, comprising:
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a cylindrical coil conductor forming a helical antenna and having a longitudinal axis, said cylindrical coil conductor including a first portion and a second portion, said first and second portions being disposed along said longitudinal axis and each having an electrical length, wherein the first operating frequency is dependent on the combined electrical length of said first and second portions; and a second antenna element having an electrical length, said second antenna element being fixedly connected to said cylindrical coil conductor at a junction disposed between said first and second portions of said cylindrical coil conductor; and
the second operating frequency is dependent on the combined electrical lengths of the first portion and said second antenna element, said second antenna element including an insulating plate and an electrically conductive pattern formed on a surface thereof, said electrically conductive pattern comprises, as a radiating antenna element, a conductor portion having at least one bend. - View Dependent Claims (32, 33, 34)
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Specification