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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
 

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