Filter device
US-2025293657-A1 · Sep 18, 2025 · US
Methods and apparatus for signal filtering
US9178487B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9178487-B2 |
| Application number | US-201313930528-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jun 28, 2013 |
| Priority date | Jun 28, 2013 |
| Publication date | Nov 3, 2015 |
| Grant date | Nov 3, 2015 |
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Abstract
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Systems and techniques for filtering of radiofrequency signals. A plurality of tunable cross-couple resonators are connected using capacitive coupling elements to form a cross-coupled bandpass filter. A center frequency of the filter may be set based on frequencies of the resonators and a fractional bandwidth of the filter may be set based on states of the capacitive coupling elements. Programmable zeroes of the filter may be set based on states of reactive elements coupling selected pairs of the resonators. The reactive elements may be capacitive, for zeroes below the center frequency, or inductive, for zeroes above the center frequency.
First claim
Opening claim text (preview).
I claim: 1. An apparatus comprising: a cross-coupled bandpass filter characterized by a tunable center frequency, tunable fractional bandwidth and one or more programmable transmission zeroes, wherein one of the programmable transmission zeroes is maintained at DC and one of the programmable transmission zeroes is maintained at an infinite frequency. 2. The apparatus of claim 1 , wherein the filter comprises a plurality of tunable resonators configured such…
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Electricity · mapped topic
- H03H7/0169Primary
Electricity · mapped topic
Electricity · mapped topic
Electricity · mapped topic
- H03H7/0161Primary
Electricity · mapped topic
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- What does patent US9178487B2 cover?
- Systems and techniques for filtering of radiofrequency signals. A plurality of tunable cross-couple resonators are connected using capacitive coupling elements to form a cross-coupled bandpass filter. A center frequency of the filter may be set based on frequencies of the resonators and a fractional bandwidth of the filter may be set based on states of the capacitive coupling elements. Programm…
- Who is the assignee on this patent?
- Nokia Corp, Nokia Technologies Oy
- What technology area does this patent fall under?
- Primary CPC classification H03H7/0169. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Nov 03 2015 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).