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[天线]66 Characterization of an aperture-stacked patch antenna for ultra-wideband wearable radio systems

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0楼发表于: 2008-10-27 23:39:34

Characterization of an aperture-stacked patch antenna for ultra-wideband wearable radio systems
Maciej Klemm and Gerhard Troester
Abstract— This paper presents, for the first time, the time-
domain characteristics of an aperture-stacked patch antenna
(ASPA) for ultra-wideband (UWB) wearable devices. The
methodology of antennas characterization for UWB radio
systems is also outlined. The antenna operates within the
3–6 GHz frequency band. Time- and frequency-domain char-
acteristics of this antenna are presented in transmission
mode (Tx), receiving mode (Rx) and for 2-antenna (Tx-Rx)
system. The pulse driving the antenna has duration of 0.65
ns. In the Tx mode, pulses radiated in different directions of
the H-plane have very similar shapes. Fidelity factors are as
high as 91.6–99.9%. For 2-antenna system, pulses received in
normal and end-fire-like directions have the fidelity of 69.5%.
As it was found, antenna does not behave “reciprocal” com-
paring Tx and Rx modes. For normal propagation direction,
radiated pulse is the 2nd derivative of the input waveform, but
in the Rx mode, received pulse is the 1st derivative of the inci-
dent plane wave. This antenna can be used for transmission of
short-pulses, even 0.65–1 ns in duration. It is also small (patch
planar dimensions 32/19 mm) and compact. Microstrip con-
figuration allows further integration of active devices on the
same board. Taking into account above results we can say
that ASPA is a good ca ..

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