AU and RU having CWG filters, and BS having the AU or RU
An antenna unit, a radio unit, and a base station are disclosed. The antenna unit or the radio unit includes a plurality of filters, each having a respective radio frequency passband. At least one first filter is a CWG filter. The first filter is coupled to a second filter through a T-junction formed on an antenna board or a radio mother board.
1. An antenna unit comprising:
an antenna board comprising a plurality of antenna elements and one or more antenna ports coupled to the plurality of antenna elements; and
a plurality of filters having a respective plurality of radio frequency passbands, wherein:
a first one of the plurality of filters is a ceramic waveguide (CWG) filter,
the first filter is coupled to a second one of the plurality of filters through a T-junction formed on one of the following boards: the antenna board, or another board comprising the antenna unit, and
the T-junction is also coupled to one of the one or more antenna ports.
2. The antenna unit according to claim 1 , wherein the T-junction is a microstrip line or a strip line.
3. The antenna unit according to claim 1 , wherein the T-junction is connected to at least one of the first filter and the second filter via a soldering pad or a connector.
4. The antenna unit according to claim 1 , wherein:
the first filter includes a plurality of resonators; and
the board on which the T-junction is formed includes a coupling structure that provides capacitive cross coupling between two of the resonators.
5. The antenna unit according to claim 1 , wherein the second filter is a CWG filter, a metal cavity filter, a surface acoustic wave (SAW) filter, a bulk acoustic wave (BAW) filter, or a film bulk acoustic resonator (FBAR) filter.
6. The antenna unit according to claim 1 , wherein the first filter and the second filter are arranged on the same side or different sides of the board on which the T-junction is formed.
7. The antenna unit according to claim 1 , further comprising a low pass filter mounted on the board on which the T-junction is formed.
8. The antenna unit according to claim 1 , wherein the T-junction is formed on the other board comprising the antenna unit, wherein the other board is one of the following: an antenna calibration (AC) board, or a power divider board.
9. A base station comprising the antenna unit of claim 1 .
10. The base station according to claim 9 , wherein the base station is a frequency division duplex (FDD) system or a dual band system.
11. A radio unit comprising:
a radio mother board (MOB) including a power amplifier; and
a plurality of filters having a respective plurality of radio frequency passbands, wherein:
a first one of the plurality of filters is a ceramic waveguide (CWG) filter,
the first filter is coupled to a second one of the plurality of filters through a T-junction formed on the radio MOB, and
the T-junction is also coupled to the power amplifier,
wherein the T-junction is a microstrip line or a strip line.
12. The radio unit according to claim 11 , wherein the T-junction is connected to at least one of the first filter and the second filter via a soldering pad or a connector.
13. The radio unit according to claim 11 , wherein:
the first filter includes a plurality of resonators; and
the radio MOB includes a coupling structure that provides capacitive cross coupling between two of the resonators.
14. The radio unit according to claim 11 , wherein the second filter is one of the following: a CWG filter, a metal cavity filter, a surface acoustic wave (SAW) filter, a bulk acoustic wave (BAW) filter, or a film bulk acoustic resonator (FBAR) filter.
15. The radio unit according to claim 11 , wherein the first filter and the second filter are arranged on the same side of the radio MOB or on different sides of the radio MOB.
16. The radio unit according to claim 11 , further comprising a low pass filter mounted on the radio MOB.