SQL - combining case between and where

caseWhereBetween.sql

CREATE FUNCTION ys_payments (@ent int,@year int,@q int) 
RETURNS TABLE 
AS 
RETURN 
...
	where year(reportingPeriod) = @year
	and 
		case 
			when @q = 1 then month(reportingPeriod) between @q and @q + 2
			when @q = 2 then month(reportingPeriod) between @q + 2 and @q + 4
			when @q = 3 then month(reportingPeriod) between @q + 4 and @q + 6
			else month(reportingPeriod) between @q + 6 and @q + 10
			
		end
		...