Composite antenna
First Claim
1. A composite antenna, comprising:
- a dipole antenna having an elongated shape;
a loop antenna including at least one pair of opposing end portions; and
a connection portion arranged to connect the dipole antenna and a point of the loop antenna at which an amplitude of a current flowing in the loop antenna has a maximum value;
whereinan electrical length of the loop antenna in a stand-alone state is greater than an electrical length of the dipole antenna in a stand-alone state.
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Accused Products
Abstract
A composite antenna achieves favorable radiation characteristics and favorable communication performance, and can be used in short distance communication as well as long distance communication. The composite antenna includes a dipole antenna having an elongated shape, a loop antenna including at least one pair of opposing end portions, and a connection portion arranged to connect the dipole antenna and a point of the loop antenna at which the amplitude of a current flowing in the loop antenna has a maximum value. The dipole antenna performs long distance communication utilizing an electric field, and the loop antenna performs short distance communication utilizing a magnetic field. This composite antenna may be used as a wireless IC device in RFID systems.
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Citations
13 Claims
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1. A composite antenna, comprising:
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a dipole antenna having an elongated shape; a loop antenna including at least one pair of opposing end portions; and a connection portion arranged to connect the dipole antenna and a point of the loop antenna at which an amplitude of a current flowing in the loop antenna has a maximum value;
whereinan electrical length of the loop antenna in a stand-alone state is greater than an electrical length of the dipole antenna in a stand-alone state. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification