FMUSER Wirless Transmit Video And Audio More Easier !

[email protected] WhatsApp +8618078869184
Language

    What is RF attenuator?

     

    Radio frequency attenuator is a very important instrument used in microwave technology. In many microwave systems, such as radar, multi-channel communication systems and other power transmission loss and received signal measurement, RF attenuators are inseparable. The sensitivity and measurement accuracy of RF attenuators are closely related to the smooth production of microwave equipment. The development of the components, test systems and test technology of the company is inseparable from the radio frequency attenuator. The measurement of the radio frequency attenuator is closely related to the establishment of microwave power, the determination of noise standards and the accuracy of attenuation correction.

    Brief introduction of RF attenuator

    RF power attenuators are widely used in electronic instrument measurement, electromagnetic compatibility testing, and attenuation inside measuring instruments, etc. Their performance directly affects the accuracy of the test and the accuracy of the measuring instrument. Therefore, designing a precise and excellent RF power attenuator is of great significance to radio measurement.

    Circuit form of radio frequency attenuator

    RF power attenuators generally use resistive elements, and there are two main circuit forms: π-type and T-type

    For RF power attenuators, there is generally no need for impedance conversion, that is: the input impedance and output impedance are equal, and the circuit is symmetrical, so whether it is a π-type circuit or a T-type circuit, R2 and R3 have the same resistance value.

    RF attenuator briefly describes the basic requirements
    The RF power attenuator must follow the following two basic principles:

    1. Impedance matching

    The RF power attenuator must have impedance matching to accurately attenuate the signal power, otherwise it will form a standing wave or reflection, which will affect the measurement accuracy. For the attenuator input, the input impedance must match the output impedance of the signal source; for the attenuator output, the output impedance must match the load impedance. Since the RF power attenuator generally does not need to perform impedance transformation, the input impedance, output impedance, load impedance and signal source output impedance are all equal.

    2. The attenuation meets the requirements

    Voltage attenuation 201gAt=20lg (Vin/Vout) (dB) or power attenuation 101gAtp=10lg (Pin/Pout) (dB) meets the required attenuation value, because the power P=V²/R, since the input impedance is equal to the output impedance, so 10lgAtp=10lg(Pin/Pout)=l0lg(Vin²/Vout²)=20lg(in/Vout)=20lgAt, so the decibels of voltage attenuation (dB) are consistent with the decibels of power attenuation (dB). According to the decibel of attenuation (dB), the multiple At of voltage attenuation can be obtained.

    Comparison of π-type attenuator and T-type attenuator

    From the above calculation, it can be seen that when the decibel of attenuation is large, R1 will be very small in the T-type attenuator. Due to the influence of the lead and solder joints, the resistance is too small to ensure its accuracy, which affects the accuracy of the attenuation. degree. For example: when the input and output impedance is 50Ω and the attenuation is 60dB, R≈50.1Ω and R1≈0.1Ω in the T-type attenuator, while R≈49.9Ω and R1≈25kΩ in the T-type attenuator. Therefore, use it when a larger attenuation is required π-type attenuator is more suitable, general attenuation, π-type attenuator and T-type attenuator are suitable.

      to sum up
    The attenuator can be formed into a cascade connection, and the attenuation amount can be selected through a switch or a relay to meet different attenuation needs. The RF power attenuator must be shielded, and non-inductive resistance must be selected to ensure that the frequency response meets the requirements. In order to withstand the corresponding radio frequency power, the resistance power of the attenuator must have a certain margin.

     

     

     

     

    List all Question

    Nickname

    Email

    Questions

    Our other product:

    Professional FM Radio Station Equipment Package

     



     

    Hotel IPTV Solution

     


      Enter email  to get a surprise

      fmuser.org

      es.fmuser.org
      it.fmuser.org
      fr.fmuser.org
      de.fmuser.org
      af.fmuser.org ->Afrikaans
      sq.fmuser.org ->Albanian
      ar.fmuser.org ->Arabic
      hy.fmuser.org ->Armenian
      az.fmuser.org ->Azerbaijani
      eu.fmuser.org ->Basque
      be.fmuser.org ->Belarusian
      bg.fmuser.org ->Bulgarian
      ca.fmuser.org ->Catalan
      zh-CN.fmuser.org ->Chinese (Simplified)
      zh-TW.fmuser.org ->Chinese (Traditional)
      hr.fmuser.org ->Croatian
      cs.fmuser.org ->Czech
      da.fmuser.org ->Danish
      nl.fmuser.org ->Dutch
      et.fmuser.org ->Estonian
      tl.fmuser.org ->Filipino
      fi.fmuser.org ->Finnish
      fr.fmuser.org ->French
      gl.fmuser.org ->Galician
      ka.fmuser.org ->Georgian
      de.fmuser.org ->German
      el.fmuser.org ->Greek
      ht.fmuser.org ->Haitian Creole
      iw.fmuser.org ->Hebrew
      hi.fmuser.org ->Hindi
      hu.fmuser.org ->Hungarian
      is.fmuser.org ->Icelandic
      id.fmuser.org ->Indonesian
      ga.fmuser.org ->Irish
      it.fmuser.org ->Italian
      ja.fmuser.org ->Japanese
      ko.fmuser.org ->Korean
      lv.fmuser.org ->Latvian
      lt.fmuser.org ->Lithuanian
      mk.fmuser.org ->Macedonian
      ms.fmuser.org ->Malay
      mt.fmuser.org ->Maltese
      no.fmuser.org ->Norwegian
      fa.fmuser.org ->Persian
      pl.fmuser.org ->Polish
      pt.fmuser.org ->Portuguese
      ro.fmuser.org ->Romanian
      ru.fmuser.org ->Russian
      sr.fmuser.org ->Serbian
      sk.fmuser.org ->Slovak
      sl.fmuser.org ->Slovenian
      es.fmuser.org ->Spanish
      sw.fmuser.org ->Swahili
      sv.fmuser.org ->Swedish
      th.fmuser.org ->Thai
      tr.fmuser.org ->Turkish
      uk.fmuser.org ->Ukrainian
      ur.fmuser.org ->Urdu
      vi.fmuser.org ->Vietnamese
      cy.fmuser.org ->Welsh
      yi.fmuser.org ->Yiddish

       
  •  

    FMUSER Wirless Transmit Video And Audio More Easier !

  • Contact

    Address:
    No.305 Room HuiLan Building No.273 Huanpu Road Guangzhou China 510620

    E-mail:
    [email protected]

    Tel / WhatApps:
    +8618078869184

  • Categories

  • Newsletter

    FIRST OR FULL NAME

    E-mail

  • paypal solution  Western UnionBank OF China
    E-mail:[email protected]   WhatsApp:+8618078869184   Skype:sky198710021 Chat with me
    Copyright 2006-2020 Powered By www.fmuser.org

    Contact Us