There is confusion regarding the submillimeter-wave range. Many papers specify its range from 300GHz but some also consider its range from 100GHz. If I design an antenna on 122ghz what would I consider it in millimeter-wave range or submillimeter-wave range?
In some book, we see, the range of microwave freq is 1-30GHz. In another book, you will get, the range is 1-300GHz. I would request you to follow old books (like R E Collin) and follow the same nomenclature.
The modern nomenclature can be found in recent papers. millimeter or submillimeter, both are correct. I prefer sub-millimeter terminology (as 122GHz is above 100Ghz)
Dear Miss Sapana,
I am from the core branch from microwave . Mr. sudipta is correct but not cent percent. as per D.M. Pozar the microave ranges from 300 MHz-300GHz. 300MHz-10GHz are concidered RF waves. Microwave range includes mm-waves as well but these covers few portion of sub mm-waves. upto 120 GHz waves are considered as Microwaves and frequency range above 120 GHz is falls into the categories of mm-wavs upto 300 GHz. from 300 GHz to 300 THz comes into the submillimeter waves. so for 122 GHz antenna it is good to concider this as mm-wave.
best wishes....
Atul Varshney Sir, you are saying that mmW starts from 120Ghz -300Ghz. but why in every recent papers we see 28Ghz, 38Ghz and 60Ghz as millimeter wave frequencies for 5G communication
since their wavelength are 10 mm, 8mm, and 6mm,. those can be considered as mm waves but exactly mmW starts from 120Ghz -300Ghz. as per D. M. pozar and K.R. harington.
but as per microwave EM bands 30 GHz - 300 GHz is well suited for MM-waves.
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