rf fundamentals - finetuning rf – finetuning...
TRANSCRIPT
RF FUNDAMENTALS
Presented By
BHUPINDER SINGH
Co-axial transmission line
Characteristic Impedance of Coaxial Line
Phase Shift
Using above, we get
Complex Propagation Constant
Co-axial transmission line
Strip transmission line
Ref: S B Cohn, “Problems in Strip Transmission Lines”
Quasi - TEM Mode
Synthesis of W/h
Effect of Strip thickness
Shielding effect in u-strip line
RULE OF THUMB: b>7*h and a>10*h
Capacitance of Micro-strip line
Capacitance of coupled line
Symmetrical coupled line
Symmetrical coupled line
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Poor coupler directivity, spurious response at 2f0 in parallel coupled line filters
Compensation for unequal phase velocities
S Parameters
For an N-Port Network
Edge Coupled Filter
Edge Coupled Filter
An approximate value for the physical length is obtained from average of even and odd mode velocities, i.e.
Edge Coupled Filter
BW
Broadband Branch Line Coupler
Ref:
Two Port Gain and Stability
Conditional Stability
Unconditional Stability
Gain, NF Circles
Gain: -------------
NF: -------------