Development of Anti-Reduction Cao-Al2o3-Mgo-Sio2 Low-Temperature Co-Fired Ceramics for 5g Copper Antennas

In this work, we highlights 5G antenna (~ 28GHz) using Al 2 O 3 -doped CaO-MgO-SiO 2 glass ceramics with reducing-resistant behavior co-fired with copper electrode. The diffusion behavior between copper electrode and low-temperature-co-fired-ceramics (LTCC) were also studied. Amphoteric Al 3+ cations can play donor and acceptor roles to constrain oxygen vacancies and free electrons in reducing-atmosphere synthesized specimens. Al 3+ ion acts as an acceptor or donor role while occupies the Si 4+ or Mg 2+ site, respectively. The 5G multilayer co-fired ceramic antennas were fabricated on the reducing-resistant (Ca(Mg 1-x Al x )Si 2 O 6 , MA) and non-reduced resistant (CaMgSi 2 O 6 , NA) LTCC materials. The return loss of S 11 = -27 dB in the antenna with Al 2 O 3 addition is close to the theoretically simulated return loss of S 11 = -28 dB, and is superior to the antenna without Al 2 O 3 addition (S 11 =-19 dB). This study demonstrates a great potential for using the reducing-resistant and diopside-phase glass-ceramics in the 5G millimeter-wave devices