弱问一下：射频和微波有区别吗？

12-09

如题，一直不知道，又没有去查书，ths!

貌似是有交集。
.87

频率上有差别，射频要低一点，微波要高一点(要不然就是反过来？我记不清了)，不过界限不明显。
.68

一般来说，30G以上被称作MMIC
30G以下被称作RFIC
不过好像一般也没怎么具体的划分

MMIC: Monolithic Microwave Integrated Circuits
RFIC: Radio Frequency Integrated Circuits

30G以上是毫米波电路

google and zz...........
==================================
1) Definitions from Google:
"Microwave" : electromagnetic radiation having a free-space wavelength b
etween 0.3 and 30 centimeters, corresponding to frequencies of 1100 gig
ahertz.
Radio frequency (abbreviated RF, rf, or r.f.) is a term that refers to a
lternating current (AC) having characteristics such that, if the current
is input to an antenna, an electromagnetic (EM) field is generated suit
able for wireless broadcasting and/or communications. These frequencies
cover a significant portion of the electromagnetic radiation spectrum, e
xtending from nine kilohertz (9 kHz), the lowest allocated wireless comm
unications frequency (it's within the range of human hearing), to thousa
nds of gigahertz (GHz).
So they have completely different definitions. However, they have a larg
e overlap region. Traditionally, RF circuit have lower frequency only be
cause we were only using the lower end of each definition.
2) MW's focus is its wavelength. The range of wavelength is comparable t
o the length of traces on a circuit board. As a result, MW is special be
cause all traces on a circuit board should be treated as transmission li
nes.
RF's focus is on wireless transmission. So most of RF circuit we are bui
lding are for wireless communication purpose.
In many cases, the two was used as equivalent because of their overlappi
ng range.
3) The definition and application of MW has been significantly changed b
y the invention of IC. It is possible that you design many circuits on a
n IC working in MW range without knowing anything about transmission lin
e. The reason is that the device sizes and trace lengths on an IC are mu
ch shorter than those on a circuit board. The exception is interface cir
cuits with the board such as LNA and PA where you will worry about the i
mpedence matching.

good
set be attention for a week

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