Wireless transmitting/receiving device
In a wireless transmitting/receiving device of TDD system etc., a transmission signal is detected on the transmitting side in a specified transmission period, a signal reflected from an antenna through a circulator is detected on the receiving side in the transmission period and a reception signal is detected on the receiving side in a specified reception period. In this case, in a part of the transmission period a transmission signal having been detected on the transmitting side is selected while in the remaining part of the transmission period a reflection signal having been detected on the receiving side through a circulator from an antenna is selected, and in the reception period a reception signal having been detected on the receiving side through the circulator from the antenna is selected and outputted.
1. A wireless transmitting/receiving device comprising:
a coupler to provide a transmission signal to an antenna side and to provide a signal from the antenna side to a receiving side; and
a first detecting portion to detect a level of the transmission signal in a transmission period of the transmission signal on a transmitting side,
a second detecting portion to switch over between detecting a level of a reflection signal of the transmission signal received through the coupler from the antenna side in the transmission period of the transmission signal on the receiving side and detecting a level of a reception signal from the antenna side through the coupler in a reception period on the receiving side, wherein
the level of the reflection signal detected by the second detecting portion and the level of the transmission signal detected by the first detecting portion are used for calculating VSWR (Voltage Standing Wave Ratio).
2. The wireless transmitting/receiving device as claimed in claim 1 , wherein the first detecting portion detects the level of the transmission signal before inputted to the coupler.
3. The wireless transmitting/receiving device as claimed in claim 1 , wherein the second detecting portion detects the level of the reflection signal in one part of the transmission period and detects the level of the transmission signal in another part of the transmission period.
4. The wireless transmitting/receiving device as claimed in claim 1 , wherein the coupler comprises a circulator.
5. The wireless transmitting/receiving device as claimed in claim 1 , further comprising a calculator to calculate a standing wave ratio from the transmission signal and the reflection signal.
6. The wireless transmitting/receiving device as claimed in claim 1 , wherein a part of the transmission period comprises a part of one transmission period and the remaining part of the transmission period comprises the remaining part of the one transmission period.
7. The wireless transmitting/receiving device as claimed in claim 1 , wherein a part of the transmission period comprises a part of overall transmission periods and the remaining part of the transmission period comprises the remaining part of the overall transmission periods.
8. A wireless transmitting/receiving device comprising:
a first selecting portion to select a transmission signal to an antenna or a reception signal from the antenna;
a detecting portion to detect a level of the transmission signal in a transmission period of the transmission signal on a transmitting side and to detect a level of a reflection signal of the transmission signal from the antenna on the transmitting side in the transmission period; and
a second selecting portion to switch over between selecting the transmission signal in the transmission period and selecting a reception signal detected on a receiving side in a reception period, wherein
the level of the reflection signal detected by the detecting portion and the level of the transmission signal detected by the detecting portion and selected by the second selecting portion are used for calculating VSWR.
9. The wireless transmitting/receiving device as claimed in claim 8 , wherein the first selecting portion comprises a two-point transmitting/receiving switch, the detecting portion comprises a coupler and a detector and the second selecting portion comprises a two-point switch and a feedback AGC circuit.
10. The wireless transmitting/receiving device as claimed in claim 8 , further comprising a third selecting portion to select the transmission signal or the reception signal both from the second selecting portion respectively in the transmission period and the reception period.