“…Acoustic wave (AW) filter modules are key components [ 2 ], but their performance degrades as frequency increases [ 3 ]. Compact RF passive components are realized by using low-temperature co-fired ceramic (LTCC) technologies, including diplexers [ 4 , 5 , 6 , 7 , 8 , 9 , 10 ], duplexers [ 11 , 12 , 13 ], band stop filters [ 14 , 15 ], and low pass filters [ 16 ]. However, when overall space constraints are considered, this may not be a suitable solution for a mobile phone.…”