A Broadband and Stable-Gain Substrate-Integrated Cavity Antenna Using Two-Level High-Order Modes

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In this article, a new design of high-order mode cavity antenna is proposed for D-band applications. By superimposing a substrate-integrated cavity (SIC) with a TE230mode onto a single-layer SIC with two high-order modes, TE210and TE310, the designed antenna element provides an impedance bandwidth coverage across the entire D-band spectrum while adding 6 matching pins to maintain a stable gain. At the same time, a multistep power divider structure and a cascaded linear taper from grounded coplanar waveguide (GCPW) to a substrate-integrated waveguide (SIW) are used in the feeding network to construct a1 × 4array. The antenna is processed using low-temperature co-fired ceramic (LTCC) technology. Experimental results demonstrate that the proposed antenna array can achieve a 36.6% (116–168 GHz) impedance matching bandwidth (|S₁₁| ≤ -10dB) and a peak gain of 13.08 dBi. The 3-dB gain bandwidth is 28% from 126 to 167 GHz, and the simulation results agree well with the measurement results.