US6621376B2
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multiband matching circuit for a power amplifier
Assignee: Industrial Technology Research Institute
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Filing: 2001-09-05
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Granted: 2003-09-16
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Expires: 2021-09-05
Abstract
Abstract An impedance-matching circuit for a multiband power amplifier, which uses an impedance-matching circuit with one-to-multiple path to efficiently transmit a radio frequency (RF) from an input port to the corresponding multi-ports without spurious effect. The impedance-matching circuit includes an input port for receiving a plurality of frequency band signals; a plurality of output ports for outputting the plurality of frequency band signals; and a plurality of frequency paths in which each path has an impedance matching network for matching an input port's impedance with its output port's impedance in a desired band; and a short circuit for filtering out RF signals in other remaining bands.
Inventors
- 👤 Shih-Ping Liu
- 👤 Yung-Nien Chiu
- 👤 Tseng-Chuan Wang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:15
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/56; H03H; H03H7/00; H03H7/38; H03F2200/00; H03F2200/111; H03F2200/387
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
87 words
A impedance-matching circuit for a multiband power amplifier, comprising an input port for receiving a plurality of frequency band signals; a plurality of output ports for outputting the plurality of frequency band signals; and a plurality of paths wherein each path has an impedance matching network for transforming its output port's impedance to the input port's impedance in a desired frequency band, and a shunt resonant circuit, connected to the impedance matching network for filtering out radio frequency signals in the remaining bands of the multiband system.
Claim 2
Dependent Claim
87 words
A impedance-matching circuit for a multiband power amplifier, comprising an input port for receiving a plurality of frequency band signals; a plurality of output ports for outputting the plurality of frequency band signals; and a plurality of paths wherein each path has an impedance matching network for transforming its output port's impedance to the input port's impedance in a desired frequency band, and a shunt resonant circuit, connected to the impedance matching network for filtering out radio frequency signals in the remaining bands of the multiband system.
Claim 3
Dependent Claim
35 words
The impedance-matching circuit of claim 1 , wherein every path further comprises a cascaded resonant circuit for providing reactance of different magnitudes and signs in different bands to allow more design flexibility in multiband matching.
Claim 4
Dependent Claim
28 words
The impedance-matching circuit of claim 2 , wherein the cascaded resonant circuit comprises an inductor and a capacitor in parallel with one end connected to the input port.
Claim 5
Dependent Claim
27 words
The impedance-matching circuit of claim 2 , wherein the cascaded resonant circuit comprises an inductor and capacitor in series with one end connected to the input port.
Claim 6
Dependent Claim
41 words
The impedance-matching circuit of claim 1 , wherein the shunt resonant circuit is composed of an inductor and capacitor in series with one end connected to ground and the other end connected to the other end of the cascaded resonant circuit.
Claim 7
Dependent Claim
20 words
The impedance-matching circuit of claim 1 , wherein the shunt resonant circuit is a transmission line with an open end.
Claim 8
Dependent Claim
20 words
The impedance-matching circuit of claim 1 , wherein the shunt resonant circuit is a transmission line with a short end.
Claim 9
Dependent Claim
50 words
The impedance-matching circuit of claim 1 , wherein the impedance matching network comprises a series inductance device connected with at least one shunt capacitance device, where one end of the inductance device is connected to the shunt resonant circuit while the other end is connected to the respective output port.
Claim 10
Dependent Claim
135 words
An impedance-matching circuit for a multiband power amplifier, comprising: an input port for receiving dual band radio frequency signals and outputting the signals to corresponding output ports; a first output path, having a first cascaded resonant circuit connected to the input port, a first shunt resonant circuit connected to the first cascaded resonant circuit, and an impedance matching network with first end connected to the first shunt resonant circuit and second end connected to the first output port; a second output path parallel to the first output path, having a second cascaded resonant circuit connected to the input port, a second shunt resonant circuit connected to the second cascaded resonant circuit, and an impedance matching network with first end connected to the second shunt resonant circuit and second end connected to the second output port.
Claim 11
Dependent Claim
135 words
An impedance-matching circuit for a multiband power amplifier, comprising: an input port for receiving dual band radio frequency signals and outputting the signals to corresponding output ports; a first output path, having a first cascaded resonant circuit connected to the input port, a first shunt resonant circuit connected to the first cascaded resonant circuit, and an impedance matching network with first end connected to the first shunt resonant circuit and second end connected to the first output port; a second output path parallel to the first output path, having a second cascaded resonant circuit connected to the input port, a second shunt resonant circuit connected to the second cascaded resonant circuit, and an impedance matching network with first end connected to the second shunt resonant circuit and second end connected to the second output port.
Claim 12
Dependent Claim
31 words
The impedance-matching circuit of claim 9 , wherein the first cascaded resonant circuit comprises an inductance device and a capacitance device in parallel with one end connected to the input port.
Claim 13
Dependent Claim
31 words
The impedance-matching circuit of claim 9 , wherein the second cascaded resonant circuit comprises an inductance device and a capacitance device in series with one end connected to the input port.
Claim 14
Dependent Claim
45 words
The impedance-matching circuit of claim 9 , wherein the first shunt resonant circuit is composed of an inductance device and a capacitance device in series with one end connected to ground and the other end connected to the other end of the cascaded resonant circuit.
Claim 15
Dependent Claim
46 words
The impedance-matching circuit of claim 9 , wherein the second shunt resonant circuit is composed of an inductance device and a capacitance device in series with one end connected to ground and the other end connected to the other end of the second cascaded resonant circuit.
Claim 16
Dependent Claim
30 words
The impedance-matching circuit of claim 9 , wherein the first shunt resonant circuit is a transmission line with an open end and a length of quarter wavelength at second frequency.
Claim 17
Dependent Claim
30 words
The impedance-matching circuit of claim 9 , wherein the second shunt resonant circuit is a transmission line with an open end and a length of quarter wavelength at first frequency.
Claim 18
Dependent Claim
30 words
The impedance-matching circuit of claim 9 , wherein the first shunt resonant circuit is a transmission line with a short end and a length of half wavelength at second frequency.
Claim 19
Dependent Claim
30 words
The impedance-matching circuit of claim 9 , wherein the second shunt resonant circuit is a transmission line with a short end and a length of quarter wavelength at first frequency.
Claim 20
Dependent Claim
51 words
The impedance-matching circuit of claim 9 , wherein the first impedance matching network comprises a series inductance device connected with at least one shunt capacitance device, where one end of the inductance device is connected to the shunt resonant circuit while the other end is connected to the first output port.
Claim 21
Dependent Claim
51 words
The impedance-matching circuit of claim 9 , wherein the second impedance matching network comprises a series inductance device connected with at least one shunt capacitance device, where one end of the inductance device is connected to the shunt resonant circuit while the other end is connected to the second output port.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2006-09-15 | 2007-03-17 | 2007-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2010-09-15 | 2011-03-17 | 2011-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2014-09-15 | 2015-03-17 | 2015-09-16 | $7700.00 | Window Closed / Lapsed |