| 摘要 |
PURPOSE: A micro-strip antenna using a piezoelectric element is provided to control a frequency band by applying an external electrical field to an antenna without applying physical deformation of the antenna. CONSTITUTION: An earth plate(100) is formed on an upper face of a lower substrate(110). A patch(120) is formed on a bottom face of an upper substrate(130). A plurality of piezoelectric elements(140) are installed between the lower substrate(110) and the upper substrate(130). The patch(130) and the earth plate(100) are formed with thin copper plates. An air layer is formed between the patch(130) and the earth plate(100). The thickness of the air layer is 0.4 to 0.6mm. The upper substrate(130) and the lower substrate(110) have thickness of 4 to 6mm. The piezoelectric elements(140) are formed with Pb(Zr,Ti)O3. An electrode(145) is formed on an upper portion and a lower portion of the piezoelectric element(140).
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