| 摘要 |
The helical antenna comprises a base body and a helically-configured conductor on a top surface of the base body, wherein base body's thickness a is given as 0.3<=a<=3 (mm); length b is given as 5<=b<=20 (mm); and relative dielectric constant epsilr is given as 3<=epsilr<=30, and conductor's winding number x is given as 3<=x<=16 (turns), and its resonant frequency f and conductor width w satisfy formulae (1): f=Ax+By+C (MHz) and (2): w=Dx+E (mm), where y represents base body width and A through E represent constants determined according to the base body's thickness a, length b, and relative dielectric constant epsilr.
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