# US 2013/0154771 A1 · Band pass filter

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- Number: US 2013/0154771 A1
- Document ID: US20130154771A1
- Status: Published application
- Kind: A1
- Application number: 13/714,781
- Filed: 2012-12-14
- Published: 2013-06-20
- Earliest claimed: 2011-12-19
- Assignees: Korea Electronics Technology Institute
- Inventors: Jin Sup KIM; Gyu Bok Lee
- Web page: https://patentgrep.com/patent/US20130154771A1

## CPC

- H01P 1/203: Strip line filters
- H01P 1/20363: {Linear resonators}
- H01P: WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE (operating at optical frequencies G02B)

## Abstract

A band pass filter is provided. The band pass filter includes a first resonator which includes a first pattern and first microstrip line; a second resonator which includes a second pattern and second microstrip line; a third pattern vertically arranged between the first pattern and second pattern; and a ground pattern connected with the third pattern, embodying a band pass filter using a resonator having a length of 1/16 wavelength or less, instead of a resonator having a length of ¼ wavelength.

## Claims

### Claim 1

A band pass filter comprising:
a first resonator which includes a first pattern and first microstrip line;
a second resonator which includes a second pattern and second microstrip line;
a third pattern vertically arranged between the first pattern and second pattern; and
a ground pattern connected with the third pattern.

### Claim 2 (depends on 1)

The band pass filter according to claim 1, wherein the first resonator is formed in such a manner that the first microstrip line is arranged so that a partial area is overlapped at a certain distance, on the first pattern.

### Claim 3 (depends on 2)

The band pass filter according to claim 2, wherein the partial area which overlaps with the first pattern of the first microstrip line generates a first inductance,
a first capacitance is generated between the first microstrip line and first pattern,
the first pattern generates a second inductance, and
a resonator is formed by the first inductance, first capacitance, and second inductance.

### Claim 4 (depends on 1)

The band pass filter according to claim 1, wherein the second resonator is formed in such a manner that the second microstrip line is arranged so that a partial area is overlapped at a certain distance, on the second pattern.

### Claim 5 (depends on 4)

The band pass filter according to claim 4, wherein the partial area which overlaps with the second pattern of the second microstrip line generates a third inductance,
the second capacitance is generated between the second microstrip line and second pattern,
the second pattern generates a fourth inductance, and
a resonator is formed by the third inductance, second capacitance, and fourth inductance.

### Claim 6 (depends on 1)

The band pass filter according to claim 1, wherein the third pattern generates a parallel inductance which magnetically combines the first resonator and second resonator.

### Claim 7 (depends on 1)

The band pass filter according to claim 1, wherein each of the first pattern and second pattern is λ/16 (λ being the wavelength of the transmission signal) long.

### Claim 8

A band pass filter comprising:
a cross pattern formed by horizontal lines and vertical lines crossing each other;
a ground pattern which is connected to both ends of the vertical lines of the cross pattern, distanced at a certain distance from the horizontal lines of the cross pattern, and arranged to surround the cross pattern;
a first microstrip line arranged at a certain distance from the cross pattern and ground pattern, and arranged to overlap with an end of the horizontal lines of the cross pattern; and
a second microstrip line arranged at a certain distance from the cross pattern and ground pattern, and arranged to overlap with the other end of the horizontal lines of the cross pattern.