Transmission-Line Filtering with Enhanced Frequency Response

Patent metadata

Field	Value
Publication number	US-2020076032-A1
Application number	US-201816118189-A
Country	US
Kind code	A1
Filing date	Aug 30, 2018
Priority date	Aug 30, 2018
Publication date	Mar 5, 2020
Grant date	—

Abstract

Transmission-line filtering with enhanced frequency response is disclosed. In an example aspect, an apparatus includes a transmission-line filter to enhance a frequency response of a filtering operation. The transmission-line filter includes an input port, an output port, and multiple transmission-line base units. The multiple transmission-line base units are disposed between the input port and the output port and are coupled to the input port and the output port. Each of the multiple transmission-line base units includes a respective transmission line of multiple transmission lines. At least one transmission-line base unit of the multiple transmission-line base units includes a multi-resonant circuit.

First claim

What is claimed is:

1 . An apparatus for enhancing a frequency response of a filtering operation, the apparatus comprising:
a transmission-line filter including:
an input port;
an output port; and
multiple transmission-line base units disposed between the input port and the output port,
the multiple transmission-line base units coupled to the input port and the output port,
each of the multiple transmission-line base units including a respective transmission line of multiple transmission lines, and
at least one transmission-line base unit of the multiple transmission-line base units including a multi-resonant circuit.

2 . The apparatus of claim 1 , wherein the at least one transmission-line base unit comprises:
a first transmission-line base unit including a first multi-resonant circuit; and a second transmission-line base unit including a second multi-resonant circuit.

3 . The apparatus of claim 2 , wherein the first multi-resonant circuit and the second multi-resonant circuit share a common capacitor that bridges the first transmission-line base unit and the second transmission-line base unit.

4 . The apparatus of claim 1 , wherein the respective transmission line of the at least one transmission-line base unit comprises:
a conductive strip; and a ground strip positioned in a parallel arrangement with respect to the conductive strip.

5 . The apparatus of claim 4 , wherein:
the at least one transmission-line base unit is configured to resonate at an operating frequency; and a length of the conductive strip of the respective transmission line of the at least one transmission-line base unit is dimensioned based on a wavelength of the operating frequency.

6 . The apparatus of claim 4 , further comprising:
a substrate comprising at least one of a glass material, a printed circuit board (PCB) material, or a semiconductor material; and a ground plane on a side of the substrate, wherein: at least a portion of each of the multiple transmission-line base units, including the conductive strip, is disposed on another side of the substrate, the other side of the substrate opposite the side of the substrate; and the ground plane includes the ground strip.

7 . The apparatus of claim 1 , wherein the multi-resonant circuit of the at least one transmission-line base unit is configured to resonate with respect to at least two frequencies.

8 . The apparatus of claim 7 , wherein the at least one transmission-line base unit is configured to create at least two poles in an S(1,1) parameter performance associated with the transmission-line filter.

9 . The apparatus of claim 7 , wherein the multi-resonant circuit comprises a parallel resonant circuit coupled between a ground and a distal end of the respective transmission line of the at least one transmission-line base unit.

10 . The apparatus of claim 7 , wherein the multi-resonant circuit comprises:
an inductor coupled to a ground; and a capacitor coupled to the respective transmission line of the at least one transmission-line base unit and the inductor.

11 . The apparatus of claim 10 , wherein the inductor comprises a vertical interconnect access (via) having an intrinsic inductive reactance.

12 . The apparatus of claim 1 , further comprising:
at least one signal pathway disposed between the input port and the output port, wherein: the multiple transmission-line base units are disposed in a chained series between the input port and the output port; each of the multiple transmission lines comprises a respective conductive strip of multiple conductive strips; and the multiple conductive strips are arranged substantially in parallel with respect to each other and substantially perpendicular to the at least one signal pathway.

13 . The apparatus of claim 1 , further comprising:
at least one signal pathway disposed between the input port and the output port, wherein: each of the multiple transmission-line base units comprises a proximal portion and a distal portion, the proximal portion of each transmission-line base unit disposed along the at least one signal pathway, each respective transmission-line base unit extending away from the at least one signal pathway to the respective distal portion thereof; and the multi-resonant circuit includes a capacitor coupled to the distal portion of the at least one transmission-line base unit.

14 . The apparatus of claim 13 , wherein the distal portion of each respective transmission-line base unit of the multiple transmission-line base units and the corresponding respective transmission line thereof comprises no more than half a length of the respective transmission-line base unit or no more than half another length of the corresponding respective transmission line.

15 . The apparatus of claim 13 , wherein:
the multi-resonant circuit is shared with another transmission-line base unit of the multiple transmission-line base units; and the capacitor is coupled between the distal portion of the at least one transmission-line base unit and the distal portion of the other transmission-line base unit.

16 . The apparatus of claim 1 , wherein:
the transmission-line filter comprises multiple vertical interconnect accesses (vias) that each individually couple at least one end of each of the multiple transmission lines to a ground; a via of the multiple vias couples an end of the respective transmission line of the at least one transmission-line base unit to the ground; the via includes an intrinsic inductance; and the intrinsic inductance of the via forms at least a portion of an inductance of the multi-resonant circuit.

17 . The apparatus of claim 1 , wherein:
the multiple transmission-line base units comprise a first quantity; the transmission-line filter is configured to generate multiple resonant frequencies that comprise a second quantity based partially on the multi-resonant circuit; and the second quantity is greater than the first quantity.

18 . The apparatus of claim 17 , wherein the transmission-line filter is configured to manifest the second quantity of multiple resonant frequencies by creating the second quantity of poles in an S(1,1) parameter performance characterization.

19 . A system for filtering a signal with a transmission-line filter having an enhanced frequency response, the system comprising:
an input port; an output port; and multiple transmission-line base units disposed in a chained series between the input port and the output port, the multiple transmission-line base units coupled to the input port and the output port, each of the multiple transmission-line base units including a respective transmission line of multiple transmission lines, the multiple transmission-line base units including:
at least one transmission-line base unit comprising generation means for generating multiple resonant frequencies for the transmission-line filter.

20 . The system of claim 19 , wherein the generation means comprises resonance means for establishing a parallel resonance between the respective transmission line of the at least one transmission-line base unit and a ground.

21 . The system of claim 20 , wherein the resonance means comprises:
an inductor coupled between an end of the respective transmission line of the at least one transmission-line base unit and the ground; another inductor coupled to the ground; and a capacitor coupled to the inductor and the other inductor, wherein the inductor, the other inductor,

Assignees

• Qualcomm Inc

Inventors

• Gavryliuk Oleksandr
• Komakha Petro
• Wong Wai San
• Novgorodov Volodymyr
• Sevskiy Georgiy
• Chernyakov Alexander

Classifications

• H03H7/0123

  comprising distributed impedance elements together with lumped impedance elements · CPC title

• H01P1/20381

  Special shape resonators · CPC title

• H01P1/2039 Primary

  Galvanic coupling between Input/Output · CPC title

• H03H2007/0192

  Complex filters · CPC title

• H03H7/468

  particularly adapted as coupling circuit between transmitters and antennas · CPC title