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US 2026/0254083 A1Published application
Circuits and methods for high frequency filters
AssigneeMurata Manufacturing Co., Ltd.
InventorWilliam Richard SMITH, Jr.
Life of this patent
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AssigneeMurata Manufacturing Co., Ltd.
InventorWilliam Richard SMITH, Jr.
Estimating the term…
Printed-line filter designs with wide bandwidth, low insertion loss, good stopband attenuation, independent control of low-side and high-side attenuation, and high selectivity. Embodiments include a printed-line pseudo-HPF design with such characteristics, and a printed-line cascaded BPF design which has approximately the same insertion loss as an equivalent single printed-line BPF filter but with greater ultimate stopband attenuation. One embodiment includes a printed interdigitated-line BPF including at least one coupling enhancement strip. Another embodiment includes a cascaded BPF including a low-pass filter and an electrically coupled printed interdigitated-line BPF including at least one coupling enhancement strip. The printed interdigitated-line bandpass filter includes a set of interdigitated resonator sections, each adjacent pair of interdigitated resonator sections being separated by an associated gap, wherein the at least one coupling enhancement strip is spaced from an associated gap separating an adjacent pair of interdigitated resonator sections in the set of interdigitated resonator sections.
A bandpass filter including a printed interdigitated-line bandpass filter including at least one coupling enhancement strip.
A bandpass filter including:
-14. (canceled)
A cascaded bandpass filter including:
The invention of claim 11, wherein the low-pass filter is a printed-line low-pass filter.
The invention of claim 11, wherein the low-pass filter is a printed commensurate-line low-pass filter.
The invention of claim 11, wherein the low-pass filter is a printed-line stepped-impedance low-pass filter.
The invention of claim 11, wherein the at least one coupling enhancement strip is electrically floating.
The invention of claim 11, wherein the at least one coupling enhancement strip is conductive.
The invention of claim 11, wherein the printed interdigitated-line bandpass filter includes a set of interdigitated resonator sections, each adjacent pair of interdigitated resonator sections being separated by an associated gap, and wherein the at least one coupling enhancement strip is spaced from an associated gap separating an adjacent pair of interdigitated resonator sections in the set of interdigitated resonator sections.
-61. (canceled)
Dependencies are inferred from the claim text.