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Abstract-A novel wideband substrate integrated waveguide (SIW) antenna topology, consisting of coupled half-mode and quarter-mode SIW resonant cavities, is proposed for operation in the 60 GHz band. This innovative topology combines a considerable bandwidth enhancement and a low form factor with compatibility with low-cost PCB manufacturing processes, making it excellently suited for next generation, high data rate wireless applications. Moreover, exploiting SIW technology, a high antenna-platform isolation is obtained, enabling dense integration with active electronics without harmful coupling. The computer-aided design process yields an antenna that covers the entire [57-64] GHz IEEE 802.11ad band with a measured fractional impedance bandwidth of 11.7% (7 GHz). The measured maximum gain and radiation efficiency of the prototype are larger than 5.1 dBi and 65%, respectively, within the entire impedance bandwidth.Index Terms-Coupled resonators, substrate integrated waveguide (SIW) antenna, half-mode SIW (HMSIW), quartermode SIW (QMSIW), bandwidth enhancement, wideband, 60 GHz. I. INTRODUCTIONn recent years, an increasing demand for broadband multimedia applications has appeared, which forces the capacity of wireless networks to increase continuously. 5G mobile communication is an excellent example of this trend, as extremely high data rates need to be offered to the end user. To this end, novel wideband antenna topologies need to be developed, exhibiting a limited footprint while being implemented through cost-efficient manufacturing, as required for integration into user equipment, such as handsets.As the spectrum up to 6 GHz is becoming ever more crowded, the [57-64] GHz IEEE 802.11ad band is the ideal candidate to meet the requirements of 5G mobile communication systems, both in terms of bandwidth and number of interconnected devices. This globally available and T. Deckmyn, D. Vande Ginste and H. Rogier are with the Department of Information Technology, IDLab, Ghent University -imec, Technologiepark 15, 9052 Ghent, dries.vande.ginste@intec.ugent.be; hendrik.rogier@intec.ugent.be).S. Agneessens is with the Department of Information Technology, IDLab, Ghent University -imec, 9052 Ghent, Belgium, and also with the Centre for Microsystems Technology (CMST), imec and Ghent University, Technologiepark 15, 9052 Ghent, Belgium. He is currently an FWO unlicensed band offers 7 GHz of frequency spectrum for wideband communication. The high atmospheric attenuation, caused by the absorption peak of oxygen atoms, makes the conditions ideal for short range, low interference, and highly secure communication between many devices sharing the same spectrum [1]- [2].Nowadays, a breakthrough of the very promising Substrate Integrated Waveguide (SIW) technology is apparent in the millimeter wave research field [3]. Recent trends and applications include antennas, filters and couplers for RF frontends [4], beam steering [5] and MIMO systems [6]. The heightened interest in SIW technology for millimeter wave applications can be att...

A cost-effective, compact and high-performance antenna element for beamforming applications in all 5G New Radio bands in the [24.25-29.5] GHz spectrum is proposed. The novel antenna topology adopts a square patch, an edge-plated air-filled cavity, and an hourglass-shaped aperture-coupled feed to achieve a very high efficiency over a wide frequency band in a compact footprint (0.48λ0 × 0.48λ0). Its compliance with standard PCB fabrication technology, without complex multi-layer PCB stack, ensures low-cost fabrication. The antenna feedplane offers a platform for compact integration of active electronic circuitry. Two different modular 1×4 antenna arrays were realized to demonstrate its suitability for broadband multi-antenna systems. Measurements of the fabricated antenna element and the antenna array prototypes revealed a -10-dB impedance bandwidth of 7.15 GHz (26.8%) and 8.2 GHz (30.83%), resp. The stand-alone antenna features a stable peak gain of 7.4 ± 0.6 dBi in the [24.25-29.5] GHz band and a measured total efficiency of at least 85%. The 1×4 array provides a peak gain of 10.1 ± 0.7 dBi and enables grating-lobe-free beamsteering from -50 • to 50 • .

A novel dual-band substrate integrated waveguide (SIW) antenna array topology is proposed for operation in the 28 GHz and 38 GHz frequency bands. Four miniaturized quartermode SIW (QMSIW) cavities are tightly coupled, causing mode bifurcation and yielding an antenna topology with four distinct resonance frequencies. A pair of resonances is assigned to both the 28 GHz and 38 GHz band, achieving wideband operation in both frequency ranges. Moreover, owing to the exploited miniaturization technique, an extremely compact array topology is obtained, facilitating easy and straightforward integration. The computer-aided design process yields a four-element antenna array that entirely covers the 28 GHz band (27.5-29.5 GHz) and 38 GHz band (37.0-38.6 GHz) with a measured impedance bandwidth of 3.65 GHz and 2.19 GHz, respectively. A measured broadside gain of 10.1 dBi, a radiation efficiency of 75.75 % and a 3 dB beamwidth of 25° are achieved in the 28 GHz band. Moreover, in the 38 GHz band the measured broadside gain amounts to 10.2 dBi, a radiation efficiency of 70.65 % is achieved and the 3 dB beamwidth is 20°.

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