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Regarding RF ground at shunt Diode in Microstrip @ 8 GHZ

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sandesh.mane

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Hello !!

Actually m designing switched line phase shifter and switching using PIN diodes(series-shunt config) on 50Ω microstrip, with substrate ε=2.2, h=31mils.

For providing Bias to PIN diodes i have used Radial stub and λ/4 high impedance line.The biasing is such that At the series shunt configuration when series diode is ON, shunt diode OFF. or vice versa. I am simulating in ADS
The problem is that when the series diode is OFF & shunt diode is ON i want to ground the RF signal through Shunt diode path,So how the layout can be.

Looking for Reply.
 

You should provide a sketch of your circuit. There are many possible topologies, and from your description we can not figure out what you are doing.
 

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