In this paper, a novel wideband transition from a laminated waveguide (LWG) to an air-filled rectangular waveguide (RWG) is proposed for millimeter-wave integration solutions based on multilayer low-temperature co-fired ceramic (LTCC) technology. The integrated transition cavity is divided into several resonators by introducing five grounded via holes. Due to the magnetic wall existing in the symmetry plane, the equivalent circuit of the proposed transition can be simplified as a three-pole filter model to explain the working mechanism with wideband performance. A W-band integrated LWG-to-RWG transition is designed as an example using LTCC technology. Two back-to-back prototypes with different lengths are fabricated and measured. A measured 25.7% bandwidth from 76 GHz to 101 GHz can be achieved for return loss better than 14 dB. The average insertion loss of a single transition is about 0.5 dB. The compact structure and wideband performance give it potential in high-density millimeter-wave and terahertz packaging.
A broadband substrate integrated cavity (SIC) antenna array based on high-order mode is proposed for low-temperature cofired ceramic (LTCC) integrated systems in W-band. To improve the gain of antenna element, a large SIC is adopted to work in high-order mode, which also avoid using excessive vias and reduce the process complexity. Two parasitic patches are loaded on the high-order mode SIC to remove the reverse E-field in the open aperture, leading to a high-gain broadside radiation. The high-order-mode SIC antenna element is fed by high-order TE 20 -mode substrate integrated waveguide (SIW), rather than regular TE 10 -mode SIW. The simplified feeding network with TE 20 -mode SIW is also designed with wideband performance, further enhancing the fabrication robustness of antenna array. To validate the proposed high-order mode-based antenna element and feeding network, a W-band 2 � 4 antenna array is designed as an example using LTCC technology. The measured return loss is better than 10 dB from 81.1 to 98.1 GHz (19% bandwidth) with a maximum gain of 18.3 dB at 94 GHz. The proposed antenna array has great potential in millimetre-wave and terahertz LTCC integrated applications.
This letter presents a novel transition scheme from laminated waveguide (LWG) to subminiature coaxial connector with wideband and low‐loss performance. The laminated waveguide is achieved using multilayer low‐temperature co‐fired ceramic (LTCC) technology. In the conventional transition scheme, a length of grounded coplanar waveguide (GCPW) is used to connect the LWG and coaxial connector to obtain a wide bandwidth, which increase the transition size and radiation loss, especially in millimetre‐wave (MMW) band. To realize a compact and low‐loss LWG‐to‐coaxial connector transition, the GCPW line is removed and the whole LTCC transition structure is designed underneath the coaxial connector. Moreover, two stages of waveguide step are introduced to constrain the electromagnetic field in the transition for lower radiation loss, which also contributes to the wideband impedance matching. The back‐to‐back transition is designed and fabricated with LTCC technology to validate the proposed transition scheme. A measured bandwidth of 44% from 27.3 to 42.9 GHz is achieved under |S11| < −15 dB and the insertion loss of single transition is about 0.4 dB.
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