# US 9,438,200 B2 · Compact broadband impedance transformer

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- Number: US 9,438,200 B2
- Document ID: US9438200B2
- Status: Granted
- Kind: B2
- Application number: 14/226,337
- Filed: 2014-03-26
- Published: 2015-10-01
- Granted: 2016-09-06
- Earliest claimed: 2014-03-26
- Assignees: Teledyne Wireless, LLC
- Applicants: Teledyne Wireless, LLC
- Inventors: William Goumas; Yehuda G. Goren
- Web page: https://patentgrep.com/patent/US9438200B2

## CPC

- H03H 7/383: {comprising distributed impedance elements together with lumped impedance elements}
- H01P 1/203: Strip line filters
- H03H 2007/386: {Multiple band impedance matching}
- H03H: IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS (waveguides, resonators, lines or other devices of the waveguide type H01P)
- H01P: WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE (operating at optical frequencies G02B)

## Abstract

In various embodiments, a broadband matching circuit is disclosed. In one embodiment. the broadband matching circuit comprises a low-pass matching section, a quarter-wavelength transformer, and a high-pass matching section.

## Claims

### Claim 1

A broadband matching circuit, comprising:
a low-pass matching section having an output;
a quarter-wavelength transformer having an input and an output; and
a high-pass matching section having an input, wherein the low-pass matching section and the high-pass matching section are in signal communication with the quarter-wavelength transformer; and
wherein the output of the low-pass matching section is coupled to the input of the quarter-wavelength transformer; and
wherein the output of the quarter-wavelength transformer is coupled to the input of the high-pass matching section.

### Claim 2 (depends on 1)

The broadband matching circuit of claim 1, wherein the broadband matching circuit is coupled to a communications system.

### Claim 3 (depends on 2)

The broadband matching circuit of claim 2, wherein the low-pass matching section is coupled to a 50 ohm source and the high-pass matching section is coupled to an output.

### Claim 4 (depends on 2)

The broadband matching circuit of claim 2, wherein the high-pass matching section is coupled to a 50 ohm source and the low-pass matching section is coupled to an output.

### Claim 5 (depends on 1)

The broadband matching circuit of claim 1, wherein the low-pass matching section comprises at least one microwave transmission line.

### Claim 6 (depends on 5)

The broadband matching circuit of claim 5, comprising:
a microwave transmission line;
a microwave transmission line T junction in signal communication with the microwave transmission line; and
an open ended stub in signal communication with the microwave transmission line T junction.

### Claim 7 (depends on 1)

The broadband matching circuit of claim 1, wherein the high-pass matching section comprises:
a capacitor; and
at least one microwave transmission line in signal communication with the capacitor.

### Claim 8 (depends on 7)

The broadband matching circuit of claim 7, wherein the at least one microwave transmission line comprises a shorted stub.

### Claim 9 (depends on 1)

The broadband matching circuit of claim 1, wherein the quarter-wavelength transformer comprises a microwave transmission line.

### Claim 10

A radiofrequency (RF) communication system comprising:
a signal source;
a broadband matching circuit in signal communication with the signal source, the broadband matching circuit comprising:
a low-pass matching section having an output;
a quarter-wavelength transformer having an input and an output, the quarter-wavelength transformer in signal communication with the low-pass matching section; and
a high-pass matching section having an input, the high-pass matching section in signal communication with the quarter-wavelength transformer; and
a RF transmitter in signal communication with the broadband matching circuit; and
wherein the output of the low-pass matching section is coupled to the input of the quarter-wavelength transformer; and
wherein the output of the quarter-wavelength transformer is coupled to the input of the high-pass matching section.

### Claim 11 (depends on 10)

The broadband matching circuit of claim 10, wherein the low-pass matching section comprises at least one microwave transmission line.

### Claim 12 (depends on 11)

The broadband matching circuit of claim 11, comprising:
a microwave transmission line;
a microwave transmission line T junction in signal communication with the microwave transmission line; and
an open ended stub in signal communication with the microwave transmission line T junction.

### Claim 13 (depends on 10)

The broadband matching circuit of claim 10, wherein the high-pass matching section comprises:
a capacitor; and
at least one microwave transmission line in signal communication with the capacitor.

### Claim 14 (depends on 13)

The broadband matching circuit of claim 13, wherein the at least one microwave transmission line comprises a shorted stub.

### Claim 15 (depends on 10)

The broadband matching circuit of claim 10, wherein the quarter-wavelength transformer comprises a microwave transmission line.

### Claim 16

A radiofrequency (RF) communication system comprising:
a RF receiver;
a broadband matching circuit in signal communication with the receiver, the broadband matching circuit comprising:
a low-pass matching section having an output, the low-pass matching section in signal communication with the quarter-wavelength transformer;
a quarter-wavelength transformer having an input and an output, the quarter-wavelength transformer in signal communication with the a high-pass matching section; and
a high-pass matching section having an input; and
a signal output in signal communication with the broadband matching circuit; and
wherein the output of the low-pass matching section is coupled to the input of the quarter-wavelength transformer; and
wherein the output of the quarter-wavelength transformer is coupled to the input of the high-pass matching section.

### Claim 17 (depends on 16)

The broadband matching circuit of claim 16, wherein the low-pass matching section comprises at least one microwave transmission line.

### Claim 18 (depends on 17)

The broadband matching circuit of claim 17, comprising:
a microwave transmission line;
a microwave transmission line T junction in signal communication with the microwave transmission line; and
an open ended stub in signal communication with the microwave transmission line T junction.

### Claim 19 (depends on 16)

The broadband matching circuit of claim 16, wherein the high-pass matching section comprises:
a capacitor; and
at least one microwave transmission line in signal communication with the capacitor.

### Claim 20 (depends on 16)

The broadband matching circuit of claim 16, wherein the quarter-wavelength transformer comprises a microwave transmission line.