LTCC SIW-Vertical-Fed-Dipole Array Fed by a Microstrip Network With Tapered Microstrip-to-SIW Transitions for Wideband Millimeter-Wave Applications

Abstract

A wideband vertical off-center-fed dipole antenna using low-temperature cofired ceramic technology working at Ka-band is presented first. The dipole is fed by a short-ended substrate integrated waveguide (SIW), and a rectangular transverse slot is built on the upper broad wall of the SIW for better impedance matching. Then, a 2 \times $ 2 array with a dimension of 17 × 25 × 0.94 mm $^3$ , fed by a microstrip network with tapered microstrip-to-SIW transitions, was fabricated and measured. Measured results show that the proposed array has a wide impedance matching bandwidth from 32.9 to 40 GHz or 19.5% for $\mid$ $S$ $_{11}$ $\mid$ $\leq$ $-$ 10 dB. The measured gain of the array is about 10 dBi with slight fluctuations over the frequency range of 29–39 GHz.