Tuneable band pass filter

• US 10,581,132 B2
• Filed: 10/31/2018
• Issued: 03/03/2020
• Est. Priority Date: 05/11/2017
• Status: Active Grant

• Current Assignee: Eagantu, Ltd.
• Original Assignee: Eagantu, Ltd.
• Inventors: Dakhiya, Michael, Joffe, Roman
• Primary Examiner(s): Patel, Rakesh B
• Application Number:
  US16/176,339
• Publication Number:
  US 20190067772A1
• Time in Patent Office: 489 Days
• Field of Search: 333204, 333205
• CPC Class Codes: H01P 1/20381 Special shape resonators
• CPC Class Codes: H01P 1/2088 Integrated in a substrate
• CPC Class Codes: H01P 5/028 between strip lines
• CPC Class Codes: H01P 7/08 Strip line resonators
• CPC Class Codes: H03H 7/0115 comprising only inductors and capacitors H03H7/075, H03H7/09, H03H7/12, H03H7/13 take precedence
• CPC Class Codes: H03H 7/175 Series LC in series path H03H7/1783 takes precedence
• CPC Class Codes: H03H 7/1775 Parallel LC in shunt or branch path H03H7/1791 takes precedence
• CPC Class Codes: H03H 9/0504 for bulk acoustic wave devices
• CPC Class Codes: H03H 9/058 for surface acoustic wave devices
• CPC Class Codes: H03H 9/13 for networks consisting of piezoelectric or electrostrictive materials H03H9/145 takes precedence
• CPC Class Codes: H03H 9/145 for networks using surface acoustic waves
• CPC Class Codes: H03H 9/54 comprising resonators of piezoelectric or electrostrictive material H03H9/64 takes precedence
• CPC Class Codes: H03H 9/6406 Filters characterised by a particular frequency characteristic

Abstract

A tunable band pass filter (BPF), including a first transmission line electromagnetically coupled to a second transmission line, wherein a length of at least one of the first transmission and the second transmission line is adjustable, and wherein a frequency of a passband of the BPF is directly related to the length of the adjustable transmission line.

Claims

1. A tunable band pass filter (BPF), comprising:

a first transmission line electromagnetically coupled to a second transmission line, wherein a length of at least one of the first transmission and the second transmission line is adjustable, and wherein a frequency of a passband of the tunable BPF is directly related to the length of the adjustable transmission line;

wherein the first transmission line and the second transmission line each contain a U-shaped portion, and wherein the U-shaped portion of the first transmission line and the U-shaped portion of the second transmission are alternating in direction and are aligned, such that the U-shaped portion of the first transmission line is placed above an opposingly positioned U-shaped portion of the second transmission line.

2. The tunable BPF of claim 1, wherein the adjustable transmission line further comprises:

at least one electromagnetic switch disposed along the adjustable transmission line, wherein the electromagnetic switch is configured to be placed in an open position or in a closed position.

3. The tunable BPF of claim 1, wherein the adjustable transmission line further comprises:

at least one inductor having an adjustable inductance.

4. The tunable BPF of claim 1, wherein the adjustable transmission line further comprises:

at least one capacitor having an adjustable capacitance.

5. The tunable BPF of claim 1, wherein the adjustable transmission line further comprises:

at least one feeding point, where the at least one feeding point is distinct from a first end and a second end of the adjustable transmission line.

6. The tunable BPF of claim 1, wherein the first transmission line is electromagnetically coupled to the second transmission line such that the coupling produces a passband of certain frequencies within an input transmission signal that are allowed, and at least one stopband of certain frequencies that are prohibited.