“…Common ceramic processes that can be cofired with metal electrodes include ultralow temperature cofired ceramics (ULTCC), low temperature cofired ceramics, and high temperature cofired ceramics. − In comparison, ULTCC (sintering temperature (ST) <650 °C) has the advantages of low power consumption, low time cost, and high-temperature sensitivity. ,, Among them, the high-temperature sensitivity means that the dielectric properties of the ceramics can be significantly improved with a small change in the ST. There are many ceramic systems that meet ULTCC, including vanadates, borates, tungstenates, tellurates, molybdates, and glass ceramics. ,− Many of these ULTCC ceramics have maintained excellent microwave dielectric properties in the microwave band. For example, Professors Joseph and Varghese have developed a series of ULTCC ceramics, including CuMoO 4 (ε r = 7.9, Q × f = 53,000 GHz, τ f = −36 ppm/°C), Ag 2 O-CuMoO 4 (ε r = 9, Q × f = 37,000 GHz, τ f = −33 ppm/°C), 10Li 2 O-10Na 2 O-20K 2 O-60MoO 3 (ε r = 4.85, Q × f = 11,078 GHz, τ f = +291 ppm/°C), α-MoO 3 (ε r = 6.6, Q × f = 41,000 GHz, τ f = −25 ppm/°C), anatase TiO 2 A-30GO17 (ε r = 9.9, Q × f = 1650 GHz, τ f = +7.4 ppm/°C), and rutile TiO 2 R-30GO17 (ε r = 15, Q × f = 3300 GHz, τ f = +8.3 ppm/°C). − In addition, a series of multilayer ceramic substrates have been developed using the above materials and the tape-casting process. − However, although ULTCC ceramics with excellent microwave dielectric properties have been successfully developed, ULTCC ceramics that also possess excellent terahertz transmission properties have rarely been reported.…”