NEC-LIST: How to design a dual band and high gain directional antenna

Hi All,
I'm trying to design a dual band (610MHz-900MHz,
1400MHz-1850MHz) directional antenna with very high
gain( >=14dBi in the lower band and >=16dBi in the
higher band ).
I'm don't know what kinds of antennas can meet the
requirements. Perhaps a corner reflector is a possible
choice.
Does anybody know it. Any paper you could recommend?
Thanks in advance.
 
                      
xingc

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