Guidelines for RF / Microwave Design -Integral Components
Guidelines for RF / Microwave Design -Integral Components
*Components can be Designed into the PCB Board Utilizing the Right Configuration of Lines and Shapes to form-
--Inductors
--Capacitors
--Couplers (Similar to Transformer)
--Resistors (Very Small Value)
--Filters
*Capacitor formed by 2 Copper Plates separated by PCB Dielectric (Free Component) -
*Interdigital Capacitor-
*Multilayer Capacitor -
*Inductor- Inline Inductor is formed by a Very Thin, High Impedance Trace
*Spiral Inductors
*Other Discrete Examples CPW & CPWG Shunt Capacitor -
*Filters can be made from the L & C Circuit Elements discussed.
*The Following Illustrates Various Filters that can be Constructed.
*λ/4 Stub is Series Resonant Circuit at Frequency.
*Circuit Shorts to Ground at λ/4, 3/4λ, etc.
*Open Circuit at DC, λ/2, λ, etc
*2W Wide for High Q and to Prevent Reflections.
*Open Stubs (one just shown) have Narrow Frequency Over which they Short to Ground.
*Flaring the Stub Increases Frequency Response.
*λ/4 Stub, Shorted to Ground, is Parallel Resonant Filter at Frequency of Interest.
*Circuit Shorts to Ground at DC, λ/2, λ, etc.
*Open Circuit at λ/4, 3/4 λ, etc.
*Low Pass Filter
*Edge Coupled Band Pass Filter -
*End Coupled Band Pass Filter -
*Directional Coupler -
*Directional Coupler can be used as -
--A Filter at λ/4 Frequencies.
--Non Loading Method to Transfer Energy to
Another Circuit.
--A Method to Monitor Power Send to Port 3.
--Closed Loop Feedback Control.
--A Non-Loading way to Measure a Signal with an Oscilloscope.
*Resistors -
--Impractical when made from PCB Copper.
--Requires Extremely Long Lines to achieve Resistance of a Few Ohms.
*One Exception -
--When Very Small ‘R’ is needed to Measure a Very Large Current.
To know more:
Guidelines for RF & microwave PCB Design
The basic knowledge about RF Microwave PCB design
Recommend reading list for RF/Microwave PCB design
PCB Blog
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