a switchable antenna includes a substrate , a first antenna element , a second antenna element , a first switch element , a second switch element , a first radiating portion on an upper surface of the substrate including a first center , a first bend section and a second bend section , and a second radiating portion on an lower surface of the substrate including a second center , a third bend section and a fourth bend section . the third and the fourth bend sections extending from the second center are respectively disposed corresponding to the first and the second bend sections extending from the first center . the first and the second antenna elements on the upper surface are disposed corresponding to the first and the second bend sections . the first and the second switch elements are respectively configured to switch the first and the second antenna elements between a reflector and a parasitic radiating element .