Radio frequency front-end circuit and communication device
AssigneeMurata Manufacturing Co., Ltd.
InventorKoji Nosaka
Life of this patent
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Abstract
An RF front-end circuit (2) includes an antenna common terminal (20) connected to an antenna element (1), an SPDT switch circuit (21) having a common terminal (21c) and select terminals (21s1 and 21s2), and four filter elements (22A to 22D). The common terminal (21c) and the filter elements (22C and 22D) are connected to the antenna common terminal (20). The filter elements (22A and 22B) are connected to the select terminals (21s1 and 21s2), respectively. Pass bands of the filter elements (22A, 22C and 22D) do not overlap with one another, and pass bands of the filter elements (22B, 22C and 22D) do not overlap with one another. The pass bands of the filter elements (22A and 22B) partly overlap with each other.
Claims16
A radio frequency front-end circuit comprising:
- an antenna common terminal connected to an antenna;
- a first switch circuit being a single pole double throw switch and comprising a common terminal connected to the antenna terminal and two select terminals;
- a first filter circuit having a first end connected to a first of the two select terminals of the first switch circuit;
- a second filter circuit having a first end connected to a second of the two select terminals of the first switch circuit;
- and
- a third filter circuit having a first end connected to the antenna terminal, wherein:
- the first, second, and third filter circuits are configured to allow radio frequency signals in different frequency bands to pass therethrough,
- a pass band of the first filter circuit does not overlap with a pass band of the third filter circuit,
- a pass band of the second filter circuit does not overlap with the pass band of the third filter circuit, and
- the pass band of the first filter circuit and the pass band of the second filter circuit at least partly overlap with each other, or a frequency interval between the pass band of the first filter circuit and the pass band of the second filter circuit is not more than 3% of a center frequency between the pass band of the first filter circuit and the pass band of the second filter circuit.
Dependencies are inferred from the claim text.