why we use negative resistance in microwave devices??

 

Hello,

Have a look at this wiki article on the gunn diode:
http://en.wikipedia.org/wiki/Gunn_diode

If you want to read more about microwave projects, you could take a look at these books:
http://www.box73.de/product_info.php?products_id=1930
http://www.box73.de/product_info.php?products_id=2216
http://www.box73.de/product_info.php?products_id=379
http://www.box73.de/product_info.php?products_id=997

Perhaps they have one or more of these books in the library.

Bertus

 

Thank u for ur help!!!!!!!

 

why we use negative resistance in microwave devices??

It is important used for the detection, generation, amplification, and control of electromagnetic radiation with wavelengths from 30 cm to 1 mm (frequencies from 1 to 300 GHz).