Antenna Matching Techniques Chapter 4 Antenna Matching Techniques Part 1

Table of Contents Transmission line principles Lumped matching circuits Reactive matching circuits Power splitting/combining networks Impedance matching and Smith Chart 1 week

4.1 Transmission line and principles

Matching Network minimum power loss in the feed line & maximum power delivery linearizing the frequency response of the circuit improving the S/N ratio of the system for sensitive receiver components (lownoise amplifier, etc.) reducing amplitude & phase errors in a power distribution network (such as antenna array-feed network)

Matching Network Factors in the selection of matching networks complexity - bandwidth requirement (such as broadband design) adjustability - implementation (transmission line, chip R/L/C elements ..)

S11, Reflection Coefficient, and Return Loss Should yield +ve value a (S11) High RL, less reflection b *Antenna is one port

4.2 Lumped Matching Networks L – Type Matching Network

Notes: Determining L – Type Matching Network

Determining L – Type Matching Network Notes: Determining L – Type Matching Network Normalized admittance changed by, Normalized impedance changed by,

L – Type Matching Network

L – Type Matching Network

L – Type Matching Network

L – Type Matching Network

L – Type Matching Network

L – Type Matching Network

Microstipline matching techniques From discrete component to microstrip line Single stub Double stub

Microstipline matching techniques Quarter Wavelength Matching Network Only used for pure-resistance matching Similar like what we did in Lab 3 Will calculate Rin or ZL first, then Z1