Published November 9, 2007

Harlan has selected one question from his "Ask Harlan" column to be featured in the November issue. Harlan will be monitoring the responses and will ultimately choose the best answer to the question. All of the responses to the featured question will be posted on our web site.

You be the expert: Please take a few moments and provide an answer to this month's featured question. Good luck and we look forward to reviewing your answer.

All responses must be submitted by December 9, 2007, to be eligible for the participation of the November question.

Alexander Dmiterko from UkrDBG has submitted this month's question:

Dear Harlan,

I am a student from Ukraine working on a power amplifier (PA) for wireless systems. I want to use a defected ground structure (DGS) technique for improving the PA's linearity. I have found some papers regarding this theme. It appears that one can calculate the parameters of an equivalent LC circuit using S-parameters of DGS, but how can I calculate the dimensions of DGS for obtaining the desired S-parameters? Can we obtain it within experiment and simulation if they do not calculate?

The winning response will win a free book from Artech House, along with an "I Asked Harlan!" t-shirt. In addition, everyone who submits a legitimate response will be sent an "I Asked Harlan!" t-shirt.

If your response is selected as the winner, you'll receive a free book of your choice from Artech House. Visit the Artech House on-line bookstore at www.artechhouse.com for details on hundreds of professional-level books in microwave engineering and related areas (maximum prize retail value $150).

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