Cold-sintered NaCa2Mg2V3O12–Li2MoO4 microwave dielectrics for the design and fabrication of high-bandwidth antennas

•(1 – x)NaCa2Mg2V3O12–xLi2MoO4 composites are prepared via cold sintering process.•(1 – x)NCMVO–xLMO has εr between 7 and 8 and Qu × f between 7000 and 13,500 GHz.•Cylindrical dielectric resonator antenna operating at 13.24 GHz has RL of 36 dB.•Microstipe patch antenna operating at 5.48 GHz has return loss of 31 dB. Preparation of (1 – x)NaCa2Mg2V3O12–xLi2MoO4 (NCMVO-LMO; x = 0.4, 0.5, 0.6, 0.7) composites via cold sintering technique under 200 °C using uniaxial pressure of 450 MPa for 50 min is reported in this article. Microstructures of these composites suggest their enhanced densification with increased LMO concentration. Relative permittivity (εr) of (1 – x) NCMVO–xLMO ceramics varies from 7 to 8, and the quality factor (Qu × f) changes from 7000 to 13,500 GHz. A cylindrical dielectric resonator antenna (CDRA) and a microstrip patch antenna (MPA) were outlined, fabricated, and tried using the 0.4NCMVO–0.6LMO composite. CDRA and MPA exhibit excellent performance with centre frequencies of 13.24 and 5.48 GHz, maximum return losses of –36 and –31 dB, and maximum impedance bandwidths of 0.77 and 1.4 GHz, respectively. These values suggest that the fabricated antennas hold the potential to be a key component in future microwave communication systems, especially for 5G and Ku-band applications. [Display omitted]