[天线]Broadband and circular-polarized Space-Filling-Based Slot Antennas

Abstract—Based on the use of space-filling curves, broad-band A@\
qoS[  
and circularly polarized microstrip-fed slot antennas are proposed. O'@m4@L   
Broad-band performance is achieved through merging different Y)5)s0}  
downscaled versions of a composition of “island-like” space-filling t{[gKV-b  
slot antennas without increasing the overall antenna size. This a5>)?m  
technique provides different resonant slot lengths corresponding to ^,~N7`  
a wide range of frequencies. By merging three downscaled versions nxf{PbHk  
of a composite second-iteration Moore slot antenna, a broad-band >9(7h&[Y  
slot antenna is developed. The proposed antenna has a bandwidth 0K`ZX&K?W  
(VSWR 2) of 87.6% around 4.5 GHz, which is higher by a Kyyih|{  
factor of 13.5 compared to the square ring slot antenna, and by QId"Cl)3  
a factor of 3 compared to the nested square rings slot antenna. //6^+-he  
The developed slot antenna has a maximum gain of 5 dB and a .wM:YX'[G  
total area of 3 3 cm2. Furthermore, by introducing asymmetry $8EV,9^U  
in the proposed slot antenna, which is implemented by replacing %f>X-*}NI-  
all parallel slots on one side of the structure and all inner slots by 9PUa?Bc`=  
a ground plane, circular polarization is achieved. The circularly Vx}Yl&*D  
polarized slot antenna version has a 3-dB axial ratio bandwidth of Q*,6X*W!~  
22%withVSWR 2. The design and simulation of the proposed `X3Xz!  
slot antennas have been performed using .. )#)
nBM2\  
X9DM^tt  

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