Compact band pass filter

• US 10,454,148 B2
• Filed: 03/09/2018
• Issued: 10/22/2019
• Est. Priority Date: 05/11/2017
• Status: Active Grant

• Current Assignee: Eagantu, Ltd.
• Original Assignee: Eagantu, Ltd.
• Inventors: Dakhiya, Michael, Shaked, Eran
• Primary Examiner(s): Patel, Rakesh B
• Application Number:
  US15/917,120
• Publication Number:
  US 20180331670A1
• Time in Patent Office: 592 Days
• Field of Search: 333204, 333205
• CPC Class Codes: H01P 1/20381 Special shape resonators
• CPC Class Codes: H01P 1/207 Hollow waveguide filters H01P1/212, H01P1/213, H01P1/215, H01P1/219 take precedence
• CPC Class Codes: H01P 1/2088 Integrated in a substrate
• CPC Class Codes: H01P 3/082 Multilayer dielectric
• CPC Class Codes: H01P 5/028 between strip lines
• 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 compact band pass filter (BPF), including a first transmission line electromagnetically coupled to a second transmission line; and an isolating surface positioned between the first transmission line and the second transmission line, wherein the isolating surface includes at least one aperture designed to produce a desired electromagnetic coupling between the first transmission line and the second transmission line wherein the coupling produces a passband such that certain frequencies within an input transmission signal are filtered out.

Claims

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

a first transmission line electromagnetically coupled to a second transmission line; and

an isolating surface positioned between the first transmission line and the second transmission line, wherein the isolating surface includes at least one aperture designed to produce a desired electromagnetic coupling between the first transmission line and the second transmission line, wherein the coupling produces a passband such that certain frequencies within an input transmission signal are filtered out, and wherein the isolating surface further includes at least one asymmetrical aperture that is asymmetrical with respect to the first transmission line and the second transmission line.

2. The BPF of claim 1, wherein an operating frequency of the BPF is between 1 gigahertz (GHz) and 32 GHz, wherein the operating frequency of the BPF includes a plurality of distinct frequency bands.

3. The BPF of claim 1, wherein a placement of the at least one aperture within the isolating surface defines a steep rejection curve between the passband and a stopband of the BPF.

4. The BPF of claim 1, wherein the first transmission line and the second transmission line each further include a U-shaped portion.

5. The BPF of claim 4, wherein the U-shaped portion of the first transmission line is aligned with the U-shaped portion of the second transmission line.

6. The BPF of claim 4, wherein the U-shaped portion of the first transmission line and the U-shaped portion of the second transmission line are alternating in direction.

7. The BPF of claim 1, further including at least one intermediate transmission line placed in between the first transmission line and the second transmission line.

8. The BPF of claim 7, further including at least one intermediate isolating surface such that the at least one intermediate isolating surface or the isolating surface is positioned between adjacent transmission lines within the BPF.

9. The BPF of claim 8, wherein each of the at least one intermediate isolating surfaces includes an aperture therein.

10. The BPF of claim 9, wherein the at least one aperture of the isolating surface and each of the apertures of the at least one intermediate isolating surfaces are asymmetrical with respect to each other.

11. The BPF of claim 1, wherein the at least one aperture within the isolating surface comprises at least one of the following shapes:

a circle, a square, a rectangle, and an ellipse.

12. A compact band pass filter (BPF), comprising:

a first transmission line; and

a second transmission line, wherein the first transmission line is electromagnetically coupled to the second transmission line, wherein the coupling produces a passband such that certain frequencies within an input transmission signal are filtered out;

wherein the first transmission line and the second transmission line each further include a U-shaped portion, wherein the U-shaped portion of the first transmission line and the U-shaped portion of the second transmission line are aligned with one another and are alternating in direction.

13. The BPF of claim 12, further comprising:

at least one intermediate transmission line placed in between the first transmission line and the second transmission line.

14. The BPF of claim 12, wherein a placement of the first transmission line and the second transmission line is configured to produce at least one steep rejection curve between the passband and a stopband of the BPF.

15. The BPF of claim 12, wherein an operating frequency of the BPF is between 1 gigahertz (GHz) and 32 GHz, wherein the operating frequency of the BPF includes a plurality of distinct frequency bands.

16. The BPF of claim 12, wherein the BPF is integrated in a handheld electronic device.