LTCC Partially-Filled Post-Wall Rectangular-Waveguide Slot Array Antenna in the Millimeter-Wave Band

Yuanfeng SHE  Jiro HIROKAWA  Makoto ANDO  Daisuke HANATANI  Masahiro FUJIMOTO  

IEICE TRANSACTIONS on Electronics   Vol.E95-C   No.10   pp.1635-1642
Publication Date: 2012/10/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E95.C.1635
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Recent Progress in Microwave and Millimeter-Wave Technologies)
waveguide,  LTCC,  loss,  slot array,  long-line effect millimeter-wave,  

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In the millimeter-wave band, the series-fed array antenna is facing a problem of large transmission loss and narrow bandwidth by using a high-permittivity and large-loss-tangent material. In this paper, an air region is inserted in the half of the height in the LTCC waveguide of εr =6.6 and tanδ =0.013 to reduce the transmission loss. The reduction of the equivalent dielectric constant by the air insertion structure enhances both the gain and the bandwidth of the series-fed slot array. The transmission loss of the single-mode rectangular waveguide has been reduced to about 1/6 by using the partially-filled structure in the 60-GHz band. In a one-dimensional slot array, the total loss has also been reduced to about 1/7. And the 3 dB-down gain bandwidth has also been increased from 1.3 GHz to 2.3 GHz.