Dielectric antenna
First Claim
1. A dielectric antenna comprising:
- a laminated member having (a) conductors on its surface and (b) at least one dielectric layer;
at least one external terminal on the external surface of the laminated member;
a first antenna element including conductors on said laminated member and having a resonance frequency at a first frequency in a first frequency band;
a second antenna element having an open stub connected thereto, said second antenna element including conductors on said laminated member and having a resonance frequency at a second frequency different from the first frequency in the first frequency band, said first antenna element and said second antenna element being disposed on different layers between which the dielectric layer is interposed, and said open stub overlapping part of the first antenna element between which the dielectric layer is interposed; and
at least one external terminal on the external surface of the laminated member, one of the terminals being connected to a feed point of said first antenna element and to a feed point of said second antenna element.
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Accused Products
Abstract
The present invention relates mainly to a small dielectric antenna capable of obtaining a good VSWR characteristic even if it is placed in the vicinity of a grounding pattern when mounted on a circuit board. A dielectric antenna is formed in which a feed point of an antenna element 13 having a resonance frequency set to a first frequency in a first frequency band and a feed point of an antenna element 14 having a resonance frequency set to a second frequency are connected to an external feed terminal 12b, and an open stub 15 connected to the antenna element 14 in the vicinity of the feed point. The open stub 15 is provided to enable resonance at each of frequencies to be used while the lengths of the antenna elements 13 and 14 are shorter than ordinary lengths determined according to the wavelengths of the frequency to be used. Further, even in the case of placement in the vicinity of a grounding conductor pattern 3 at the time of mounting on a circuit board 1, the frequency bandwidth through which a good VSWR characteristic can be obtained in a used frequency band can be extended.
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Citations
18 Claims
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1. A dielectric antenna comprising:
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a laminated member having (a) conductors on its surface and (b) at least one dielectric layer;
at least one external terminal on the external surface of the laminated member;
a first antenna element including conductors on said laminated member and having a resonance frequency at a first frequency in a first frequency band;
a second antenna element having an open stub connected thereto, said second antenna element including conductors on said laminated member and having a resonance frequency at a second frequency different from the first frequency in the first frequency band, said first antenna element and said second antenna element being disposed on different layers between which the dielectric layer is interposed, and said open stub overlapping part of the first antenna element between which the dielectric layer is interposed; and
at least one external terminal on the external surface of the laminated member, one of the terminals being connected to a feed point of said first antenna element and to a feed point of said second antenna element. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A dielectric antenna comprising:
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a laminated member having (a) conductors on its surface and (b) at least one dielectric layer;
a first antenna element including conductors on said laminated member and having a resonance frequency at a first frequency in a first frequency band;
a second antenna element having an open stub connected thereto, said second antenna element including conductors on said laminated member and having a resonance frequency at a second frequency different from the first frequency in the first frequency band, said first antenna element and said second antenna element being disposed on different layers between which the dielectric layer is interposed, said first antenna element being folded so as to meander in a lamination surface, and said first antenna element and said open stub being located so that portions thereof are superposed at a plurality of positions between which the dielectric layer is interposed; and
at least one external terminal on the external surface of the laminated member, one of the external terminals being connected to a feed point of said first antenna element and to a feed point of said second antenna element. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification