140-GHz <inline-formula> <tex-math notation="LaTeX">$TE_{340}$ </tex-math> </inline-formula>-Mode Substrate Integrated Cavities-Fed Slot Antenna Array in LTCC

Abstract

In this paper, a TE 340-mode substrate-integrated cavity (SIC) excited 2 × 2 slot antenna subarray with two TE 210-mode SICs' loading is presented at 140 GHz in low-temperature co-fired ceramic. By using the TE 340-mode SIC, the number of vias used in the feeding network and the area of the feeding network can be reduced compared to the feeding network composed of conventional TE 10 /TE 20-mode SIW power dividers. The proposed simplified and miniaturized high-order mode SIC-based feeding network leads to lower transmission loss and fabrication cost and reduces the fabrication difficulty. Each pair of radiating slots is loaded by a TE 210-mode SIC to improve the impedance bandwidth and the gain performance. For the proof of concept, an 8 × 8 antenna array is further designed and measured. The measured impedance bandwidth of the proposed 8 × 8 antenna array is 10.7% from 130.3 to 145 GHz for |S 11 | ≤ −10 dB. The measured peak gain is 20.5 dBi. The measured radiation efficiency is 59.2%. INDEX TERMS 140 GHz, low temperature co-fired ceramic (LTCC), TE 340 mode, TE 210 mode, substrate integrated cavity (SIC), slot antenna.

Antenna Array Design Based on Low-Temperature Co-Fired Ceramics

“…The measured S11 curve was close to the simulated curve, and was less than −10 dB in the target frequency band (88 GHz-98 GHz). Figures [26][27][28][29][30][31] show the test results of the antenna pattern of the LTCC antenna array at 92 GHz, 94 GHz and 96 GHz. Basically, the test results were in good agreement with the simulation results.…”

“…Furthermore, a ground metal column can be inserted at the midpoint of the gap on the symmetrical side to enhance the transmission efficiency of the slot, as depicted in Figure 3. This structure, commonly found at the end of SIW feeding networks, has been discussed in existing studies [26][27][28][29]. Considering that this slot feeding structure contains the direction change in the electromagnetic wave transmission, along with the feature of the LTCC multi-layer stacking process, this study introduces a novel stepped structure to enhance the original feeding Considering that this slot feeding structure contains the direction change in the electromagnetic wave transmission, along with the feature of the LTCC multi-layer stacking process, this study introduces a novel stepped structure to enhance the original feeding structure design.…”

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

“…Various types of antenna element have been reported to build the integrated antenna array with LTCC technology, mainly including microstrip patch antenna [5][6][7], metamaterialbased antenna [8,9], and substrate integrated cavity antenna [10][11][12][13][14][15][16]. The microstrip patch antenna is the most popular radiator candidate for integrated systems because of its simple structure and excellent performance.…”

“…A TE 340 -mode SIC proposed in ref. [15], working as a four-way power divider, is used to feed the TE 210 -mode SIC antenna with LTCC technology in D-band. In ref.…”

“…Furthermore, in order to reduce the complexity of MMW antenna array, the high‐order‐mode technology is introduced to remove the internal sidewall between adjacent dominant‐mode SIW or SIC [14–16, 19, 20]. In ref.…”