Patent ID: 8754826

Claim:
An antenna device comprising: an antenna having a single feed; a first phase shifter serially inserted in a main path connecting the antenna and a radio frequency circuit; a first filter serially inserted in the main path and having an input end connected to an output end of the first phase shifter; a second phase shifter serially inserted in the main path and having an input end connected to an output end of the first filter, wherein the first filter includes only a single output; a first circuit including: a second filter having an input end directly coupled to the output end of the first phase shifter on the main path; a first single pole, dual throw (SPDT) switch having a common terminal, a first switched terminal, and a second switched terminal, wherein the common terminal is directly coupled to an output end of the second filter; a first matching circuit having a first end directly coupled to the first switched terminal of the SPDT switch and a second end directly coupled to the main path between the output end of the first filter and an input end of the second phase shifter; and a second matching circuit having a first end directly coupled to the second switched terminal of the SPDT switch and a second end directly coupled to the main path between the output end of the first filter and the input end of the second phase shifter; and a selection controller configured to control the SPDT switch to selectively connect each of the first and second matching circuits in parallel to the main path.