Among the top 10 government bond ETFs, all but one are focused on specific maturity ranges. (awealthofcommonsense.com)
However, some ETF providers have begun issuing ETFs with specific maturity dates, which hold each bond until they expire and distribute the proceeds once all bonds have matured. (etf.com)
The approach is to invest in specific maturity dates, or «rungs» of the ladder. (indexologyblog.com)