1~6GHz RF Power detector.

I need to either buy or design an RF power detector (using descrete components), sth like MAX2015 http://www.maxim-ic.com/quick_view2.cfm/qv_pk/4072/ln/, but my operation frequency is from 1 to 6 GHz. Can anyone give me some suggestion? Which company has this product? If I construct this power detector, can I use the following topology? How should I divide the channel frequencies? Where can I get the LNA, Mixer, switch and Freq Synthesizer for each channel?

http://www.analog.com/en/prod/0,,770_847_AD8318,00.html
http://www.linear.com/pc/productDetail.do;jsessionid=DxFEvFCK8QgVURMta8Hul3 FybCgazWY6iPHRLVQDtTS1nA2L8Dp2!-1245222164?navId=H0,C1,C1011,C1074,P2276