I am trying to optimise single element before making an array.
I would particular be interested in knowing the experiences of the fellows and any considerations to achieve low S11 for a single patch.
Do you have any value/standard that I should be targeting? (so that I can modify my requirements/limitation on size and cost etc.)
I am not sure what question you mean to ask. The theoretical best achievable S11 for a single microstrip patch antenna at high frequency is minus infinity dB. This is the best achievable for any antenna. It means the antenna is matched to the feed and no power is reflected. It is impossible to measure this and a real antenna will never be this good, but -20 dB or -30 dB should be achievable and measurable, and are as much as is ever required. -10 dB or -15 dB are acceptable in many applications. High frequency does not make this any harder to do. There are standard procedures for matching patch antennas, I suggest you do a web search for how to match a patch antenna.
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