Ka-band 3D meander stripline delay line using LTCC

Two low insertion loss and low time dispersion delay line (approximate 16λ_g and 1λ_g @ 34.2 GHz), using low temperature co-fired ceramic (LTCC) technology, are proposed in this paper. Compared with other structures, with the unique merits of LTCC, it's more easily to realize compact dimension delay line, as 4.2 × 3 × 3 mm³ for 16λ_g delay line and 2 × 1.5 × 3 mm³ for 1λ_g delay line. The final simulation results agree well with that of the theoretical calculation, showing the insertion Loss (IL) (16λ_g) is 2.296 dB at 34.2 GHz and less than 2.536 dB in the band (34.1-34.3 GHz), the VSWR is better than 1.27. IL (1λ_g) is 0.316 dB at 34.2 GHz and less than 0.317 dB in the band (34.1-34.3 GHz), the VSWR is better than 1.25.