Matsayin Kisan Gaba: Tsarin, Kirki da Tushen Aiki

Muhimmiyyar Impedance Matching

Muhimmiyyar impedance matching ya nufin prosesi na kwallo input impedance da output impedance ta zabe electrical load don samun signal reflection ko maximize power transfer ta zabe.

Circuit electrical yana ciki da power sources kamar amplifier ko generator da electrical load kamar light bulb ko transmission line suka taka source impedance. Wannan source impedance yana dace da resistance a kan series tare da reactance.

Karamin maximum power transfer theorem, idan load resistance yana dace da source resistance da load reactance yana dace da negative of the source reactance, maximum power yana fito daga source zuwa load. Yana nufin cewa maximum power zai iya fito idan load impedance yana dace da complex conjugate of the source impedance.

A cikin DC circuit, frequency ba a lalace ba. Saboda haka, abin da aka bayyana yana tabbas idan load resistance yana dace da source resistance. A cikin AC circuit, reactance yana yi nasara a kan frequency. Saboda haka, idan impedance yana dace a kan wata frequency, ba za a dace ba idan frequency yana canzawa.

Smith Chart Impedance Matching

Smith chart an gina shi Philip H Smith da T. Mizuhashi. Shi ne graphical calculator wanda ake amfani da ita don fuskantar masu ilimi mai zurfi a kan transmission lines da matching circuits. An yi hakan da kuma bayyana abubuwan RF parameter a kan wata ko mafi yawan frequencies. 

Smith chart an amfani da shi don bayyana abubuwan kamar impedances, admittances, noise figure circles, scattering parameters, reflection coefficient, da mechanical vibrations, k.s.a. Saboda haka, akwai smith chart a kan most RF analysis software saboda shi ne daya daga cikin abubuwan muhimman methods to RF engineers.

Akawo biyu na smith charts;

• Impedance Smith Charts (Z Charts)

• Admittance Smith Charts (Y Charts)

• Immittance Smith Charts (YZ Charts)

Impedance Matching Circuit and Formula

Idan an bana load resistance R, zan iya samu circuit wanda yake dace driving resistance R’ a kan frequency ω0. Da kuma ake gina L matching circuit (kamar yadda aka bayyana a cikin wannan figure).

Babu nan, zan iya samu admittance (Yin) ta wannan circuit.

Idan Resistor (R) da Inductor (L) suka duba a kan series. Da kuma wannan combination yana duba a kan parallel tare da Capacitor (C). Saboda haka, Impedance ce,