# US 2014/0155001 A1 · Concurrent multiband transceiver

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- Number: US 2014/0155001 A1
- Document ID: US20140155001A1
- Status: Published application
- Kind: A1
- Application number: 14/097,097
- Filed: 2013-12-04
- Published: 2014-06-05
- Earliest claimed: 2012-12-05
- Assignees: NXP B.V.
- Applicants: NXP B.V.
- Inventors: Antonius de Graauw; Markus van Schie
- Web page: https://patentgrep.com/patent/US20140155001A1

## CPC

- H04B 1/40: Circuits
- H04B 1/0053: {with common antenna for more than one band}
- H04B 1/0458: {Arrangements for matching and coupling between power amplifier and antenna or between amplifying stages (matching circuits in general H03H)}
- H04B 1/18: Input circuits, e.g. for coupling to an antenna or a transmission line (coupling networks between antennas or lines and receivers independent of the nature of the receiver H03H)
- H04L 27/18: Phase-modulated carrier systems, i.e. using phase-shift keying (H04L27/32 takes precedence)
- H04B: TRANSMISSION
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)

## Abstract

The invention refers to an RF front-end (100) adapted to perform either in a receiving mode or in a transmitting mode and adapted to receive or transmit signals located in at least two separated frequency bands, respectively comprising an input and an output and further comprising an input matching circuit (1) comprising a first input coupled to the input of the RF front-end (100), an output matching circuit (2) coupled to the output; the input matching circuit (1) being coupled to the output matching circuit (2) via respective first amplifier (3) and second amplifier (4), and a phase shifter (5) coupled either to the input of the RF front-end (100) in a receiving mode, or to the output of the RF front-end (100) in a transmitting mode.

## Claims

### Claim 1

An RF front-end adapted to perform either in a receiving mode or in a transmitting mode and adapted to receive or transmit signals located in at least two separated frequency bands, respectively comprising an input and an output and further comprising
an input and an output;
an input matching circuit comprising a first input coupled to the input,
an output matching circuit coupled to the output;
the input matching circuit being coupled to the output matching circuit via respective first amplifier and second amplifier;
a phase shifter coupled either to the input of the RF front-end in a transmitting mode, or to the output of the RF front-end in a receiving mode;
wherein the phase shifter provides at its output an odd multiple of 180° phase shift of a signal situated in a first frequency band applied to its input and
wherein the phase shifter provides at its output an even multiple of 180° phase shift of a signal situated in a second frequency band applied to its input.

### Claim 2 (depends on 1)

An RF front-end as claimed in claim 1, wherein the output matching circuit comprises a third input coupled to an output of the first amplifier circuit, and a fourth input coupled to an output of the second amplifier circuit.

### Claim 3 (depends on 1)

An RF front-end as claimed in claim 1, wherein the input matching circuit has the same structure as the output matching circuit.

### Claim 4 (depends on 1)

An RF front-end as claimed in claim 1, wherein the first phase shifter comprises a delay line or a lumped passive or active filter.

### Claim 5

(canceled)

### Claim 6

(canceled)

### Claim 7 (depends on 1)

An RF front-end as claimed in claim 1, wherein the input matching circuit comprises a T filter comprising inductors.

### Claim 8 (depends on 1)

An RF front-end as claimed in claim 1, wherein the output matching circuit comprises a T filter comprising inductors.

### Claim 9 (depends on 1)

An RF front-end as claimed in claim 1, wherein the first amplifier and the second amplifier are single-ended or differential amplifiers.

### Claim 10 (depends on 1)

A transmitter comprising a signal combiner coupled to an RF front-end as claimed in claim 1, the RF front-end being coupled to a dual mode multiband antenna.

### Claim 11 (depends on 1)

A receiver comprising a dual band multiband antenna coupled to an RF front-end as claimed in claim 1, the RF front-end being coupled to a signal splitter.

### Claim 12 (depends on 10)

A communication system comprising a transmitter as claimed in claim 10.

### Claim 13 (depends on 1)

A communication system comprising a transmitter, the transmitter comprising a power combiner, coupled to an RF front-end as claimed in claim 1, the RF front-end being coupled to a dual mode multiband antenna.

### Claim 14 (depends on 1)

A communication system comprising a receiver, the receiver comprising a dual mode multiband antenna coupled to an RF front-end as claimed in claim 1, the RF front-end being coupled to a signal splitter.

### Claim 15

(canceled)

### Claim 16

(canceled)

### Claim 17 (depends on 1)

A radar system including at least a communication system as claimed in claim 1.

### Claim 18 (depends on 17)

A vehicle comprising a radar system as claimed in claim 17.