60-GHz Wideband Substrate-Integrated-Waveguide Slot Array Using Closely Spaced Elements for Planar Multisector Antenna

Recent Technologies in Japan on Array Antennas for Wireless Systems

“…Slot array antennas on the broad-walls [27], [28] or the narrow-walls [29] on hollow waveguides give high antenna efficiency because of their low transmission loss, however the bandwidth becomes limited due to long line effects. Slot array antennas fed by a laminated-waveguide [30] or a substrate-integratedwaveguide [31] were developed because of the simplicity of print-circuit-board fabrication techniques. A hollowwaveguide full-corporate-feed slot array antenna provides both high antenna efficiency and wide bandwidth [32].…”

Substrate-Integrated Waveguide-Based 60-GHz Resonant Slotted Waveguide Arrays With Wide Impedance Bandwidth and High Gain

“…Various types of antennas working at 60GHz have been investigated, such as patch [2][3], grid [4], Yagi [5][6][7], dipole [8][9], tapered slot [10][11][12], dielectric resonator [13] and slot antenna [14][15][16][17]. Among these, substrate integrated waveguide (SIW) based slotted waveguide array is one of the most promising candidates for mass production due to its high gain, planar structure, low cost and easy fabrication.…”

“…However, its fractional bandwidth is still not wide enough and multilayer structure is required. In [17], multiple transverse slots with different lengths were successively arranged at an interval of less than one-quarter of guided wavelength on an SIW to realize a 60GHz SIW slot array with 15% bandwidth and 14.5dBi peak gain. In [26], two longitudinal resonant slots with different resonant frequencies were cut along the SIW in order to increase the impedance bandwidth of a 2×1-element array.…”

60-GHz switched-beam end-fire antenna module integrated with novel microstrip-to-slot transition

“…Owing to the limited performance and increased die cost of on-chip antennas, numerous AiP solutions realized in polytetrafluoroethylene (PTFE), glass cloth resin, low-temperature co-fired ceramics (LTCC) and liquid crystal polymer (LCP) susbtrates have recently been proposed in [2], [3], [4], and [5] respectively. In [2], [4], and [5] the antenna element has a broadside radiation pattern whereas Suga et. al proposed a post-wall waveguide aperture antenna with endfire radiation in [3].…”