Rugged Clearance of GND Copper Pour from RF Structure (Cadence Allegro)

Hi All,

I am in the process of cleaning up my RF design and I noticed these rugged clearance of the copper pour on my rf structure. I am supposed to maintain a 15 mils trace to copper pour clearance or in the case of rf structure (shape <rf structure> to shape <copper pour> clearance of 15 mils). I have already set my constraint manager to this but the result on the edges of the rf structure is far from what I been expecting. On the tapered curving structure there is this unwanted sharp triangular clearance, refer to attached snapshot.

On the snapshot, blue is the RF structure, gray is the ground copper pour.

Anyone have encountered this problem before and found a solution?

I am using cadence allagero v16.5 on windows 7 platform.

maybe you need Allegro + Miniaturization license equivalent to Allegro XL)

When I am cleaning up design, I am using Allegro 16.5 High-Speed, Miniaturization.