| 摘要 |
In an antenna unit (10), the generation of capacitances (C11, C12) between each of the open ends of first (10a) and second (10b) microstrip antennas and a control electrode (18) is controlled by turning a switch (19) on and off, both antenna frequencies being simultaneously changed. The antenna unit has a basic body having first and second main surfaces and at least one end surface extending between the main surfaces; a grounding electrode (12) provided on the first main surface of the basic body (11); a first radiation electrode (13) forming a first antenna (10a), having an open end at one end thereof, and provided on the second main surface of the basic body; a second radiation electrode (14) forming a second antenna (lOb), having an open end at one end thereof, and provided on the second main surface of the basic body; a first connecting electrode (15) for connecting the first radiation electrode to the grounding electrode, and provided on an end surface of the basic body; a second connecting electrode (16) for connecting the second radiation electrode to the grounding electrode, and provided on an end surface of the basic body; a feeding electrode (17) for transmitting a signal to at least one of the first radiation electrode and the second radiation electrode, and provided on the basic body; and a control electrode (18) on the basic body for providing coupling capacitances (C11, C12) between the open end of the first radiation electrode and the control electrode and between the open end of the second radiation electrode and the control electrode, and provided so as to be close to each of the open ends. <IMAGE> |
