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

Characterization of an aperture-stacked patch antenna for ultra-wideband wearable radio systems Bptt"  
Maciej Klemm and Gerhard Troester DvEII'-h  
Abstract— This paper presents, for the first time, the time- j,,#B4b  
domain characteristics of an aperture-stacked patch antenna FIn)O-<  
(ASPA) for ultra-wideband (UWB) wearable devices. The KI<x`b  
methodology of antennas characterization for UWB radio fR.raI4et  
systems is also outlined. The antenna operates within the ]Gl_L7u`  
3–6 GHz frequency band. Time- and frequency-domain char- ?{Xp'D\z  
acteristics of this antenna are presented in transmission /x-tl)(s=  
mode (Tx), receiving mode (Rx) and for 2-antenna (Tx-Rx) R U[  
system. The pulse driving the antenna has duration of 0.65 &m(eMX0lU  
ns. In the Tx mode, pulses radiated in different directions of E3Z>R=s  
the H-plane have very similar shapes. Fidelity factors are as 7({.kD6  
high as 91.6–99.9%. For 2-antenna system, pulses received in $o\Uq  
normal and end-fire-like directions have the fidelity of 69.5%. #tPy0QH  
As it was found, antenna does not behave “reciprocal” com- i\36 s$\  
paring Tx and Rx modes. For normal propagation direction, 7;}TNK\+v  
radiated pulse is the 2nd derivative of the input waveform, but ku^2K  
in the Rx mode, received pulse is the 1st derivative of the inci- !oV'  
dent plane wave. This antenna can be used for transmission of x2i`$iNhmP  
short-pulses, even 0.65–1 ns in duration. It is also small (patch Fo"'[`  
planar dimensions 32/19 mm) and compact. Microstrip con- 0A~f ^  
figuration allows further integration of active devices on the fv3)#>Dgp>  
same board. Taking into account above results we can say 
'U`I  
that ASPA is a good ca .. DF#WQ8?$]  
b=Sl`&A  

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