| 摘要 |
A miniature microstrip antenna having a circuit board with a suitable length and a suitable width, and especially a microstrip antenna of which the size is reduced but the antenna still keeps the broadband function in all the directions, wherein, the circuit board does not have any metallic portion in the back side thereof. A ¼lambd microstrip line is rolled on the surface of the circuit board in the shape of a rectangular spiral, the end of the rectangular spiral microstrip line is connected via a vertical section to another {fraction (1/20)}lambd microstrip line which acts as an open-stub. A junction of the rectangular spiral microstrip line with the open-stub acts as a signal feeder point; a ground plane is provided near the signal feeder point but does not connect with the signal feeder point, the ground plane is punched to form a hole to get a desired harmonic oscillation frequency shifting. The miniature microstrip antenna has the size thereof reduced can thus be obtained.
|
