The present disclosure provides a semiconductor device package including a first device, a second device, and a spacer. The first device includes a substrate having a first dielectric constant. The second device includes a dielectric element, an antenna, and a reinforcing element. The dielectric element has a second dielectric constant less than the first dielectric constant. The antenna is at least partially within the dielectric element. The reinforcing element is disposed on the dielectric element, and the reinforcing element has a third dielectric constant greater than the first dielectric constant. The spacer is disposed between the first device and the second device and configured to define a distance between the first device and the second device.