Antenna system for receiving and transmitting wireless signals

Patent metadata

Field	Value
Publication number	US-10135134-B2
Application number	US-201615093748-A
Country	US
Kind code	B2
Filing date	Apr 8, 2016
Priority date	Jun 21, 2012
Publication date	Nov 20, 2018
Grant date	Nov 20, 2018

Abstract

An antenna system includes N integrated passive components (IPCs). A first end of each IPC of the N IPCs is directly configured to couple to an antenna for receiving signals of a band corresponding to the IPC and filtering signals of bands corresponding to other IPCs of the N IPCs. The antenna system can prevent signals of various bands from interfering with each other, reduces parasitic capacitance effect, and further improves nonlinear distortion.

First claim

What is claimed is:

1. An antenna system for receiving and transmitting wireless signals, comprising:
N integrated passive components (IPCs), wherein an IPC of the N IPCs is configured to couple to an antenna for receiving a first band wireless signal from the antenna and filtering other band wireless signals corresponding to other IPCs of the N IPCs, wherein the IPC comprises:
a choker for choking the other band wireless signals; and
an impedance inverter coupled to the choker and the impedance inverter having an electrical length corresponding to ¼ wavelength of the first band wireless signal;

N bypass switches, wherein a bypass switch corresponding to the IPC is coupled to the IPC and the bypass switch is configured to be optionally turned on for further completely filtering the other band wireless signals;
a transmitting switch coupled between the antenna and a transmitter;
a receiver coupled to the N IPCs and configured to receive the first band wireless signal from the antenna through the IPC; and
the transmitter configured to transmit a second band wireless signal to the antenna through the transmitting switch when the transmitting switch is turned on;
wherein N is an integer greater than 1.

2. The antenna system of claim 1 , wherein the choker is coupled between the impedance inverter and the antenna, the bypass switch is coupled between an output terminal of the impedance inverter and a reference potential, and when the antenna receives the first band wireless signal, the corresponding bypass switch is turned off.

3. The antenna system of claim 2 , wherein the choker comprises:
a first inductor coupled between the impedance inverter and the antenna; and
a first capacitor connected to the first inductor in parallel.

4. The antenna system of claim 3 , wherein the impedance inverter is equivalent to a π-type filter when operating at the first band wireless signal, wherein the π-type filter comprises:
a second inductor coupled between the choker and the bypass switch;
a second capacitor coupled between a node between the choker and the second inductor and the reference potential; and
a third capacitor coupled between the second inductor and the reference potential.

5. The antenna system of claim 3 , wherein the impedance inverter is equivalent to a π-type filter when operating at the first band wireless signal, wherein the π-type filter comprises:
a second capacitor coupled between the choker and the bypass switch;
a second inductor coupled between a node between the choker and the second capacitor and the reference potential; and
a third inductor coupled between the second capacitor and the reference potential.

6. The antenna system of claim 3 , wherein the impedance inverter is equivalent to a T-type filter when operating at the first band wireless signal, wherein the T-type filter comprises:
a second inductor coupled to the choker;
a third inductor coupled between the second inductor and the bypass switch; and
a second capacitor coupled between a node between the second inductor and the third inductor and the reference potential.

7. The antenna system of claim 3 , wherein the impedance inverter is equivalent to a T-type filter when operating at the first band wireless signal, wherein the T-type filter comprises:
a second capacitor coupled to the choker;
a third capacitor coupled between the second capacitor and the bypass switch; and
a second inductor coupled between a node between the second capacitor and the third capacitor and the reference potential.

8. The antenna system of claim 2 , further comprising:
a set of serially connected switches coupled between the transmitting switch and the reference potential.

9. The antenna system of claim 2 , wherein the choker comprises at least two choke units, each choke unit of the at least two choke units is used for choking a corresponding wireless signal of the other band wireless signals, and the at least two choke units are serially connected to each other.

10. The antenna system of claim 1 , wherein when the antenna receives the first band wireless signal, the bypass switch and the transmitting switch are turned off; and when the transmitter transmits the second band wireless signal to the antenna, the bypass switch and the transmitting switch are turned on.

11. The antenna system of claim 1 , wherein the impedance inverter is coupled between the choker and the antenna, and the bypass switch of the N bypass switches is coupled between a node between the impedance inverter and the choker and a reference potential.

12. The antenna system of claim 11 , further comprising:
a set of serially connected switches coupled between the transmitting switch and the reference potential.

13. The antenna system of claim 1 , wherein when the antenna receives the first band wireless signal, the N bypass switches and the transmitting switch are turned off; when the transmitter transmits the second band wireless signal to the antenna, the bypass switch and the transmitting switch are turned on and other bypass switches of the N bypass switches different from the bypass switch are turned off, wherein bands of the other band wireless signals are even number times a band of the first band wireless signal.

14. The antenna system of claim 1 , wherein a choker of each first IPC of at least one first IPC of the N IPCs is coupled between an impedance inverter of the each first IPC and the antenna, and an impedance inverter of each second IPC of other second IPCs of the N IPCs different from the at least one first IPC is coupled between a choker of the each second IPC and the antenna, wherein a first bypass switch of the N bypass switches corresponding to the each first IPC is coupled between an output terminal of the impedance inverter of the each first IPC and a reference potential, and a second bypass switch of the N bypass switches corresponding to the each second IPC is coupled between a node between the impedance inverter of the each second IPC and the choker of the each second IPC and the reference potential.

15. The antenna system of claim 14 , further comprising:
a set of serially connected switches coupled between the transmitting switch and the reference potential.

16. The antenna system of claim 1 , wherein when the antenna receives a first predetermined band wireless signal corresponding to the each first IPC, the N bypass switches and the transmitting switch are turned off; when the antenna receives a second predetermined band wireless signal corresponding to the each second IPC, the second bypass switch and the transmitting switch are turned off; when the antenna transmits the first predetermined band wireless signal corresponding to the each first IPC, the first bypass switch and the transmitting switch are turned on, and the second bypass switch is turned off; and when the antenna transmits the second predetermined band wireless signal corresponding to the each second IPC, the second bypass switch and the transmitting switch are turned on, wherein a band of the second predetermined band wireless signal is even number times a band of the first predetermined band wireless signal.

17. The antenna system of claim 1 , wherein the choker is not directly electrically connected to a reference potential.

Assignees

• Richwave Technology Corp

Inventors

• Chen Chih-Sheng

Classifications

• H03H7/461

  particularly adapted for use in common antenna systems · CPC title

• H04B1/18

  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) · CPC title

• H04B1/0053

  with common antenna for more than one band · CPC title

• H01Q1/525 Primary

  between emitting and receiving antennas · CPC title