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US 2009/0153431 A1Published application
Continuously Tunable Impedance Matching Network Using BST Capacitor
AssigneeAgile RF, Inc.
InventorNan Ni
Life of this patent
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Abstract
An impedance matching circuit employs a variable capacitor, such as a BST capacitor. The bias voltage to the variable capacitor may be adjusted in order to match several different frequencies used with the antenna to the signal source.
Claims14
A tunable impedance matching circuit coupled between a signal source and an antenna, the tunable impedance matching circuit comprising:
- a variable capacitor coupled in series to the signal source, a capacitance of the variable capacitor being adjustable according to a bias voltage applied to the variable capacitor;
- a first inductor coupled in series to the variable capacitor and the antenna;
- and
- a second inductor coupled to a node between the variable capacitor and the first inductor,
- wherein a combined impedance of the tunable impedance matching network and the antenna is tunable to match an impedance of the signal source by adjusting the bias voltage applied to the variable capacitor.
2 more elements
A tunable impedance matching circuit coupled between a signal source and an antenna, the tunable impedance matching circuit comprising:
- a first, variable capacitor coupled in parallel to the signal source, a capacitance of the first, variable capacitor being adjustable according to a bias voltage applied to the first, variable capacitor;
- an inductor coupled in parallel to the variable capacitor;
- and
- a second capacitor coupled between the first, variable capacitor and the inductor,
- wherein a combined impedance of the tunable impedance matching network and the antenna is tunable to match an impedance of the signal source by adjusting the bias voltage applied to the first, variable capacitor.
2 more elements
Dependencies are inferred from the claim text.