Repeater

1. A repeater, comprising:

a donor device, including a first receiving antenna array and a first transmitting antenna array disposed on a first substrate having a first normal direction, and a first antenna controller configured to control the first receiving antenna array and the first transmitting antenna array to receive and transmit data from and to a base station, respectively;

a service device, including a second receiving antenna and a second transmitting antenna disposed on a second substrate having a second normal direction, and a second antenna controller configured to control the second receiving antenna and the second transmitting antenna to receive and transmit data from and to a customer premise equipment (CPE), respectively;

a down-link (DL) circuit, including:

a first low noise amplifier (LNA) coupled to the first receiving antenna array;

a first buffer circuit coupled to the first LNA;

a first power amplifier (PA) coupled between the first buffer circuit and the second transmitting antenna;

a first power detector configured to detect a first received signal strength indication (RSSI) of a first signal from the first LNA; and

a first control circuit configured to determine whether the first RSSI is higher than a first threshold or lower than a second threshold;

an up-link circuit, including:

a second low noise amplifier (LNA) coupled to the second receiving antenna;

a second buffer circuit coupled to the second low noise amplifier;

a second power amplifier (PA) coupled between the second buffer circuit and the first transmitting antenna array,

wherein the first normal direction is different from the second normal direction, and

wherein the first receiving antenna array and the second transmitting antenna are orthogonally polarized with each other,

wherein if the first RSSI is determined to be higher than the first threshold, the first control circuit is configured to adjust a gain of the first PA to be decreased, and

wherein if the first RSSI is determined to be lower than the second threshold, the first control circuit is configured to adjust the gain of the first PA to be increased.

2. The repeater according to claim 1 , wherein the second transmitting antenna and the second receiving antenna are orthogonally polarized with each other.

3. The repeater according to claim 1 , wherein the first receiving antenna array and the second transmitting antenna are orthogonally polarized with each other.

4. The repeater according to claim 1 , wherein the first transmitting antenna array and the second receiving antenna are orthogonally polarized with each other.

5. The repeater according to claim 1 , wherein the first substrate includes a first sub-substrate and a second sub-substrate, and the first receiving antenna array and the first transmitting antenna array are disposed on the first sub-substrate and the second sub-substrate, respectively.

6. The repeater according to claim 5 , wherein the second substrate includes a third sub-substrate and a fourth sub-substrate, and the second receiving antenna and the second transmitting antenna are disposed on the third sub-substrate and the fourth sub-substrate, respectively.

7. The repeater according to claim 1 , further comprising:

a first horn-shaped shielding having a plurality of first side walls disposed along sides of the first substrate, wherein the plurality of first side walls are tilted with a first predetermined angle with respect to the first normal direction of the first sub-substrate; and

a second horn-shaped shielding having a plurality of second side walls disposed along sides of the second substrate, wherein the plurality of second side walls are tilted with a second predetermined angle with respect to the second normal direction of the second sub-substrate.

8. The repeater according to claim 1 , wherein the second transmitting antenna further includes a second transmitting antenna array, and the second receiving antenna further includes a second receiving antenna array.

9. The repeater according to claim 1 , wherein the first control circuit is configured to determine whether the first RSSI is lower than a third threshold,

wherein if the first RSSI is lower than the third threshold, the first control circuit is configured to turn off the first PA, and

wherein the third threshold is lower than the second threshold.

10. The repeater according to claim 9 , wherein the UL circuit further includes:

a second power detector configured to detect a second received signal strength indication (RSSI) of a second signal from the second LNA;

a second control circuit configured to determine whether the second RSSI is higher than a fourth threshold or lower than a fifth threshold,

wherein if the second RSSI is determined to be higher than the fourth threshold, the second control circuit is configured to adjust a gain of the second PA to be decreased;

wherein if the second RSSI is determined to be lower than the fifth threshold, the second control circuit is configured to adjust the gain of the second PA to be increased.

11. The repeater according to claim 10 , wherein the second control circuit is configured to determine whether the second RSSI is lower than a sixth threshold,

wherein if the second RSSI is lower than the sixth threshold, the second control circuit is configured to turn off the first PA, and

wherein the sixth threshold is lower than the fifth threshold.

12. The repeater according to claim 11 , wherein the second control circuit is further configured to transmit a first control signal to the first control circuit when the second signal is detected to be received from the second LNA by the second power detector, and

wherein the first control circuit is configured to turn off the first PA when the first control signal is received.

13. The repeater according to claim 12 , wherein the first control circuit is further configured to transmit a second control signal to the second control circuit when the first signal is detected to be received from the first LNA by the first power detector, and

wherein the second control circuit is configured to turn off the second PA when the second control signal is received.

14. The repeater according to claim 1 , further comprising:

a first frequency selective surface (FSS) disposed between the first receiving antenna array and the second transmitting antenna; and

a second frequency selective surface (FSS) disposed between the second receiving antenna and the first transmitting antenna array.

15. The repeater according to claim 1 , wherein the first antenna controller is configured to control the first receiving antenna array to receive data with a first radiation pattern having a first receiving direction,

wherein the second antenna controller is configured to control the second transmitting antenna to transmit data with a second radiation pattern having a second transmitting direction, wherein the second radiation pattern includes a second main beam along the second transmitting direction and a plurality of side lobes, and

wherein the second antenna controller is configured to decrease levels of the side lobes by executing a controlling algorithm.