The Half “T” and Full ‘T’ switching configurations will also improve isolation. In the Half T shown here there are two RF reed relays with one having open contacts and the other closed to ground. In this case, the open contacts keep the majority of the RF signal blocked and any leakage from the open contacts will be shunted to ground through the closed contacts. In the Full T there are three RF reed relays. In this case, it offers the same characteristics as in the Half T with the addition of the third relay where it further isolates the signal with its open contacts.