A Novel Wideband Transition from LTCC Laminated Waveguide to Air-Filled Rectangular Waveguide for W-band Applications

Abstract

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.

Broadband high‐gain low‐temperature cofired ceramic substrate integrated cavity antenna array based on high‐order mode for W‐band applications

“…To facilitate the measurement in W-band, a compact vertical transition from SIW to rectangular waveguide (RWG) is designed and integrated in the LTCC module. The wideband working mechanism of this transition are presented in our another work [22]. To verify the feasibility of the proposed antenna scheme, a prototype of the designed 2 � 4 antenna array is fabricated using multilayer LTCC technology.…”

“…The simulated radiation efficiency is about 70% within the working band, while the measured radiation efficiency is not obtained due to the test system limitation in the laboratory. To calibrate the measured radiation gain of the proposed antenna array, two back-to-back transitions are designed and fabricated to estimate the feeding SIW [22]. It is demonstrated that the insertion loss of 12 mm-SIW is about 0.96 dB.…”

“…To facilitate the measurement in W‐band, a compact vertical transition from SIW to rectangular waveguide (RWG) is designed and integrated in the LTCC module. The wideband working mechanism of this transition are presented in our another work [22].…”