Antenna matching apparatus
First Claim
1. An antenna matching apparatus comprising:
- a plurality of antenna elements;
matching sections respectively connected to said antenna elements that adjust impedance;
a first detection section that detects any one of a signal reflected when power is supplied to said antenna elements, reflection coefficient and voltage standing wave ratio;
a second detection section that detects signals received by said antenna elements;
a storage section that stores control information on said matching sections in a one-to-one correspondence with the distances between the human body and antenna elements; and
a control section that adaptively controls said matching sections using the control information stored in said storage section so as to achieve an impedance matched state.
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Accused Products
Abstract
An antenna matching apparatus capable of eliminating impedance mismatching produced when the antenna element is placed close to the human body in a short time and reducing power loss due to impedance mismatching. This apparatus connects variable capacitance capacitors VC1 and VC2 for impedance adjustment to transmission antenna element TA1, connects variable capacitance capacitors VC3 and VC4 to reception antenna element RA1 respectively, provides beforehand capacitance values of respective variable capacitance capacitors which are impedance matched in a table in a one-to-one correspondence with the distances between the antenna elements and human body and stores the table in storage section (106). The apparatus completes adaptive control processing for any one of transmission antenna element TA1 and reception antenna element RA1, reads other capacitance values corresponding to the capacitance value at that moment from the table and performs adaptive control processing on other antenna elements using the read values as initial values.
44 Citations
10 Claims
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1. An antenna matching apparatus comprising:
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a plurality of antenna elements;
matching sections respectively connected to said antenna elements that adjust impedance;
a first detection section that detects any one of a signal reflected when power is supplied to said antenna elements, reflection coefficient and voltage standing wave ratio;
a second detection section that detects signals received by said antenna elements;
a storage section that stores control information on said matching sections in a one-to-one correspondence with the distances between the human body and antenna elements; and
a control section that adaptively controls said matching sections using the control information stored in said storage section so as to achieve an impedance matched state. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification