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发表于 2010-12-2 10:09:02
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FICA可以在低频产生双谐振吗?
我看到一段呀关于FICA的介绍如下:
里面只说了高频可以产生两个谐振.
In the case of the FICA
coupled with a mobile phone PCB ground, the resulting radiating
structure can be designed to exhibit a resonance in the low band and
two resonances in the high band. In particular, in the low band
(900 MHz) the FICA component is electrically short, thus requiring
the PCB length to provide an electrical counterpoise. The resulting
resonant mode is called ‘common mode’ since it features in-phase
currents on the FICA arms and longitudinal currents on the PCB
ground. Two modes can be synthesised in the high band: a ‘differential
mode’, featuring opposite phased currents on the FICA arms
and transverse currents on the PCB ground; a ‘slot mode’, which is a
higher order common mode, featuring a strong excitation of the FICA
slot. Differential and slot modes can be synthesised in order to
produce a wide, continuous radiating band. |
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