The basic characteristics of the microwave frequency is high
    Looking from the low frequency radio waves, microwaves to X-rays as well as visible light , Y rays entire electromagnetic spectrum , although they can be found on both belong to the same electromagnetic be , but as the frequency increases , the electromagnetic wave having respective different wavelength bands different properties . Compared with the low-frequency radio waves , microwaves has the following four basic characteristics .
Microwave oscillation frequency is extremely high, at three hundred million times per second ! As low frequency radio wave frequency ratio increased several orders of magnitude , some of the low frequency band is not significant if the effect of the microwave band is very clearly demonstrated . For example, in common gate control tube , the electron over time between poles 0.000001 level of magnitude , than the long, medium and short wave radio wave oscillation period is much smaller , is negligible , but with the microwave oscillation period ratio, it must not be ignored. Therefore, at low frequencies can be considered normal Shan control without inertia tube , when the frequency after up to the microwave band , the inertia of the electronic components will lose effective control action , so as to be established based on the principle of the new microwave tubes , microwave solid-state devices and quantum devices replaced . Is the speed of light, due to electromagnetic waves , so that it spread to the other end of the circuit - asthma will take some time , this is the " delay effect ." In general, much less than the low-frequency oscillation circuit delay period , it can be ignored ; But in microwave circuits delay LAU compared with the cycle , can no longer be ignored in the case of a simple harmonic oscillator . This delay performance of the circuit between the respective points have not phase . In addition, skin effect of high frequency current . Liberal radio transmission line effects, etc. , are also decreases with increasing frequency and increasing limits of these effects in the microwave band - like bang clearly find out m .
    It is important to as high frequency microwaves , Gang too large relative to the award in grams ( i.e. not associated with the amount irresolute disc center frequency ratio ) , its frequency band is wide can be up to hundreds or even thousands of MHz , which is low compared to the wireless bar fire method , the band constitution means that the information capacity, so the microwave with a great potential of information mortar grams , making it a great play information acquisition special occasions ( such as multi- channel communication ) has been widely application .