# US 2014/0191827 A1 · Wideband high frequency bandpass filter

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- Number: US 2014/0191827 A1
- Document ID: US20140191827A1
- Status: Published application
- Kind: A1
- Application number: 13/842,763
- Filed: 2013-03-15
- Published: 2014-07-10
- Earliest claimed: 2013-01-04
- Assignees: National Tsing Hua University
- Applicants: National Tsing Hua University
- Inventors: Ta-Jen Yen; Ruei-Han Jiang; Tsung-Yu Huang; Ai-Ping Yen
- Web page: https://patentgrep.com/patent/US20140191827A1

## CPC

- H01P 1/203: Strip line filters
- H01P 1/20381: {Special shape resonators}
- H01P: WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE (operating at optical frequencies G02B)

## Abstract

A wideband high frequency bandpass filter is disclosed, which includes an open-circuit resonator structure and a short-circuit resonator structure. The open-circuit resonator has a signal transmission strip line and a T-shaped strip line. Both ends of the signal transmission strip line are bent toward to opposite ends of the T-shaped strip line respectively, so as to form gaps in the open-circuit resonator. The open-circuit resonator structure and the short-circuit resonator structure are coupled under the resonant mode, thereby achieving a bandpass filtering at 60 GHz.

## Claims

### Claim 1

A wideband high frequency bandpass filter, utilized to filter an electromagnetic wave having a central frequency of 60 GHz, comprising:
a short-circuit resonator structure comprising a first T-shaped strip line, and the first T-shaped strip line comprising a ground terminal, a first terminal and a second terminal opposite to the first terminal; and
an open-circuit resonator structure comprising a second T-shaped strip line and a signal transmission strip line, the second T-shaped strip line comprising a third terminal, a fourth terminal and a fifth terminal, the third terminal and the fourth terminal being opposite to each other, the fifth terminal being connected to the signal transmission strip line, and two opposite ends of the signal transmission strip line being bent toward to the third terminal and the forth terminal respectively, so as to form a gap with the third terminal and the forth terminal respectively;
wherein, the signal transmission strip line faces and aparts from a strip line segment between the first terminal and the second terminal with an interval, a signal input terminal and a signal output terminal are disposed on bent portions of the signal transmission strip line respectively, the signal input terminal receives an electromagnetic wave signal, and the signal output terminal outputs the filtered electromagnetic wave signal.

### Claim 2 (depends on 1)

The wideband high frequency bandpass filter of claim 1, wherein a linewidth of the second T-shaped strip line is greater than a linewidth of the signal transmission strip line.

### Claim 3 (depends on 2)

The wideband high frequency bandpass filter of claim 2, wherein a length of the strip line between the first terminal and the second terminal is greater than a length of the strip line between the third terminal and the fourth terminal.

### Claim 4 (depends on 3)

The wideband high frequency bandpass filter of claim 3, wherein the bent portions of the signal transmission strip line is an L-shaped segment.

### Claim 5 (depends on 1)

The wideband high frequency bandpass filter of claim 1, wherein the interval is approximately 60 um.

### Claim 6 (depends on 1)

The wideband high frequency bandpass filter of claim 1, wherein the signal input terminal and the signal output terminal are disposed in the interval and near the bending parts of the signal transmission strip line respectively.

### Claim 7 (depends on 6)

The wideband high frequency bandpass filter of claim 6, wherein the signal input terminal and the signal output terminal are spaced with a 5 um distance from the signal transmission strip line.

### Claim 8 (depends on 1)

The wideband high frequency bandpass filter of claim 1, further comprising a substrate, and a surface of the substrate being utilized to fixedly dispose the first T-shaped strip line of the short-circuit resonance structure, the second T-shaped strip line of the open-circuit resonance structure and the signal transmission strip line.

### Claim 9 (depends on 1)

The wideband high frequency bandpass filter of claim 1, wherein the material of the substrate is made of polyimide.