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A 35-GHz wideband low-temperature co-fired ceramic (LTCC) vertical off-center-fed dipole antenna is presented. The widened bandwidth of the dipole antenna is achieved by paralleling a ring-shaped stub placed above the ground with a vertical off-center-fed dipole. The fabricated dipole antenna with a dimension of 7.5  19  0.94 mm exhibits a measured –10-dB S11 bandwidth of 25.4% covering the frequency range of 31.2 to 40 GHz and a measured maximum gain of 4.4 dBi at 32 GHz with a fluctuation of 1.7 dB over 31 to 39 GHz frequency range. Then, a 2  2 array was designed. The array with a dimension of 15  25  0.94 mm exhibits a measured –10-dBS11 bandwidth of 28.6% covering the frequency range of 30 to 40 GHz and a maximum gain of 10.37 dBi at 31 GHz with a fluctuation of 1.8 dB over 31 to 39 GHz frequency range. The radiation performances of the dipole antenna and its array were also measured. Good agreement is obtained between the simulations and measurements.

35-GHz Wideband Vertical Off-Center-Fed Dipole and Its Array in LTCC Technology