Surface mount antenna and communication device including the same
First Claim
1. A surface mount antenna comprising:
- a dielectric substrate; and
a radiating electrode formed on the dielectric substrate, one end of said radiating electrode being an open end, one of a feeding electrode and a ground terminal being formed on an opposite end of said radiating electrode, wherein the radiating electrode includes a first part having a small electrical length per unit physical length and a second part having a greater electrical length than the small electrical length of the first part, the first part and the second part being arranged in series along a current path between the one end and the opposite end.
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Accused Products
Abstract
In a feeding radiation electrode of a surface mount antenna, a series inductance component such as a meander pattern is formed locally in a maximum resonance current part in a high-order mode (second-order mode) so as to locally form a series inductance component therein thereby making the maximum resonance current part have a greater electrical length per unit physical length than the other parts. This makes it possible to control the difference between the resonance frequency in a fundamental mode and the resonance frequency in the high-order mode over a large range. Furthermore, it is possible to vary the resonance frequency in the second-order mode independently of the resonance frequency in the fundamental mode by varying the number of lines or the line-to-line distance of the meander pattern thereby varying the value of the series inductance component. Thus, it is possible to easily and efficiently design a surface mount antenna having a frequency characteristic which satisfies requirements needed in multi-band applications without having to change the basic design.
48 Citations
28 Claims
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1. A surface mount antenna comprising:
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a dielectric substrate; and
a radiating electrode formed on the dielectric substrate, one end of said radiating electrode being an open end, one of a feeding electrode and a ground terminal being formed on an opposite end of said radiating electrode, wherein the radiating electrode includes a first part having a small electrical length per unit physical length and a second part having a greater electrical length than the small electrical length of the first part, the first part and the second part being arranged in series along a current path between the one end and the opposite end.
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2. A surface mount antenna comprising:
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a dielectric substrate; and
a radiating electrode formed on the dielectric substrate, one end of the radiating electrode being an open end, one of a feeding electrode and a ground terminal being formed on an opposite end of the radiating electrode, wherein the radiating electrode includes a first part in which a resonance current in a fundamental mode becomes maximum and a second part in which a resonance current in a high-order mode becomes maximum, the first part and the second part being arranged in series along a current path between the one end and the opposite end; and
at least one of the first and second parts includes an inductance component disposed in series in the current path. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A communication device comprising at least one of a transmitting circuit and a receiving circuit, and further comprising a surface mount antenna mounted on a substrate coupled to the at least one of a transmitting circuit and receiving circuit, the surface mount antenna comprising:
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a dielectric substrate; and
a radiating electrode formed on the dielectric substrate, one end of said radiating electrode being an open end, one of a feeding electrode and a ground terminal being formed on an opposite end of said radiating electrode, wherein the radiating electrode includes a first part having a small electrical length per unit physical length and a second part having a greater electrical length than the small electrical length of the first part, the first part and the second part being arranged in series along a current path between the one end and the opposite end.
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16. A communication device comprising at least one of a transmitting circuit and a receiving circuit, and further comprising a surface mount antenna mounted on a substrate and coupled to the at least one of a transmitting circuit and receiving circuit, the surface mount antenna comprising:
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a dielectric substrate; and
a radiating electrode formed on the dielectric substrate, one end of the radiating electrode being an open end, one of a feeding electrode and a ground terminal being formed on an opposite end of the radiating electrode, wherein the radiating electrode includes a first part in which a resonance current in a fundamental mode becomes maximum and a second part in which a resonance current in a high-order mode becomes maximum, the first part and the second part being arranged in series along a current path between the one end and the opposite end; and
at least one of the first and second parts includes an inductance component disposed in series in the current path. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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Specification