ABSTRACT. This paper presents a cavity-backed slot filtering antenna (filtenna) designed based on gap waveguide structure using novel sidewalls. Rather than using traditional full-length pins, the unit-cell geometry of the proposed sidewall consists of a λ/8 high pin placed above a λ/8 high solid wall, where the total height of the pin and wall is quarter wavelength of the operating frequency in free space. The resonant frequency of the designed filtenna is 30.5 GHz and the fractional bandwidth is 6.3%. The designed filtering antenna is fabricated using computer numerical control (CNC) milling technology. The simulated and measured results of the proposed filtenna are in excellent agreement.

ABSTRACT. Low-cost fabrication of D band components is still challenging because of the small feature size of the design parameters. This paper introduces current 3D printing technologies that can be used to produce metallic waveguide-based components. In particular, metal binder jetting (MBJ) is a support-free printing technique suitable for printing complex structures. This paper aims to discuss D band antenna-filter integration by applying the MBJ process. The manufacturing strategy is applied to the design and optimization of an asymmetric iris filter which is later integrated with a resonant cavity antenna. The simulation results show that the proposed antenna-filter module has a three-order flirting performance with a maximum gain of 16.5 dBi.

ABSTRACT. This paper designs a miniaturized reflective phase shifter based on liquid crystal. The phase shifter adjusts the dielectric constant of the liquid crystal to cause the load impedance to change, thereby realizing the phase change at the output of the coupler. Through the multilayer circuit structure, the miniaturization of the phase shifter is realized. In the operating bandwidth of 14GHz~16GHz, the return loss is better than -10.89dB, the insertion loss is better than 5.7dB, and the maximum phase shift exceeds 320°.

ABSTRACT. A 35GHz circular-polarized rectenna with high efficiency is proposed in this paper .The rectifier is designed at 35GHz using Schottky diode of MA4E1310.Two Schottky diode is series-parallel connected in the rectifying circuit, which has a measured rectifying efficiency of 54% with a 600 Ω when the received power is 63mW. The proposed rectifier is printed on the bottom side of antenna. The antenna is simulated by the full wave EM analysis software of HFSS and the rectifying circuit is simulated by using the ADS software . A four element rectenna array is designed with rotating array and the circular patch antenna fed by the coupling slot is employed to receive power form free space with a high gain of 12 dB .The low profile and easy integration of the proposed rectenna will be used for reference in the field of millimeter wave wireless energy transmission.(MMPT)

ABSTRACT. In short-range millimeter-wave (MMW) 3-D imaging applications, scanning 1-D multiple-input multiple-output (MIMO) array shows the advantages in low cost and fast data acquisition comparing to traditional single-input-single-output (SISO) and 2-D MIMO techniques. However, in practical applications, the actual synthetic aperture array is non-uniform since uniform scanning is difficult to achieve. To solve this problem, a frequency-domain fast imaging algorithm based on non-uniform fast Fourier transform (NUFFT) is proposed in this paper. Simulation and experimental results show significant improvement in imaging efficiency comparing to traditional methods such as back projection (BP) algorithm, while maintaining the imaging quality.

ABSTRACT. This paper describes a 220-GHz solid-state dual-carrier superheterodyne wireless link using 64-QAM modulation over a distance of 5 cm. By aggregating two channels in sub-terahertz band, the real-time data rate of the proposed link is double to achieve 31.2 Gbps (15.6 Gbps per channel). The measured SNR is 24.2 dB and 25.4 dB, and the BER is 1.8e-7 and 8.6e-8 for two channels, respectively. Meanwhile, 4-K video transmission is carried out in two channels which are all clear and free of stuck. The successful transmission of aggregated channels in this work shows great potential for future high data rate real-time communication.

ABSTRACT. the realization of terahertz external amplitude modulators with a carrier frequency of 0.8 THz is presented for application in the next generation near-field wireless communications.

ABSTRACT. In this paper, we present low cost THz wireless transmission system utilizing 278GHz resonant tunneling diode (RTD) transmitter (Tx) with around 1mW output power. The demonstration shows 12Gbps error free and 1080p30 (3Gbps) HD video real time transmission over 80 cm distance. These results demonstrate very promising future of RTD Tx for next generation wireless communication system.

Angeliki Alexiou                     ARIADNE – A Synthesis of 3 Critical 6G Enablers         
University of Piraeus, Greece

Joachim Oberhammer           H2020 CartTera2
KTH Royal Institute of Technology, Sweden