Gap Waveguide Research Articles

The Effect of a Printed Gap Waveguide Antenna at 60 GHz on the Human Body

The Effect of a Printed Gap Waveguide Antenna at 60 GHz on the Human Body

High-efficiency single-layer corporate-feed gap waveguide based circularly polarized antenna array with compact size

A high-efficiency, single-layer gap waveguide based circularly polarized (CP) metasurface (MTS) antenna array has been proposed at Ka-band, employing a combination of printed circuit board (PCB) and machining techniques. The coupling slot parallel to the feeding ridge is proposed, which can be beneficial for designing single-layer ridge gap waveguide (RGW) networks, avoiding the traditional cavity layer and reducing the transmission loss. The MTS elements in a 4 × 4 lattice of truncated-corner patches are etched on a single substrate layer for lightweight and low-cost, validating the concept of a compact mixed design that can be easily adapted to other printed CP antennas. A 4 × 4 MTS array prototype was fabricated and tested. The impedance bandwidth and axial ratio bandwidth are 26–31.3 GHz (18.5%) and 28.2–33 GHz (15.7%), respectively. Over the entire operating bandwidth of 28.2–31.3 GHz (10.4%), antenna radiation efficiency exceeds 82%, and the maximum realized gain at 29.2 GHz is 21.2 dBi. The designed broadband MTS antenna array is efficient, compact, and suitable for certain millimeter-wave communication applications.

Wideband PCB-Based Planar Array Antenna With High Aperture Efficiency Based on Substrate Integrated Gap Waveguide

Wideband PCB-Based Planar Array Antenna With High Aperture Efficiency Based on Substrate Integrated Gap Waveguide

Slot fed circularly polarized magneto-electric dipole antenna array fed by optimized printed microstrip gap waveguide network

<p>A compact, circularly polarized 8 × 8 antenna array is designed for the 60 GHz band. The array comprises circularly polarized magneto-electric dipoles (CP-ME-Dipole) excited by narrow slots. The slots are fed by a printed gap waveguide (PGWG) cooperative network optimized based on the termination of the effective impedance of the array elements. Thus, it accounts for the space mutual coupling of the antenna elements. A procedure based on the full-wave analysis of a 4 ´ 4 array is used to estimate each element’s 8 × 8 array effective port impedance. The cooperative feeding network is designed based on the known effective impedances. The array is divided into two half subarrays out of phase from each other, and a rectangular waveguide feeds both sides. The commonly measured bandwidth of 18.3% achieves return loss better than 10 dB and an axial ratio below 3 dB (AR) of less than 3 dB. A maximum gain of 26.2 dBic with a high radiation efficiency of 82% radiation efficiency.</p>

An Air-Filled Double-Sided Gap Waveguide Based on Glass Packaging for mm-W Applications

An Air-Filled Double-Sided Gap Waveguide Based on Glass Packaging for mm-W Applications

A Compact and Wideband MMIC-to-Ridge Gap Waveguide Contactless Transition for Phased Array Antenna Front Ends

A Compact and Wideband MMIC-to-Ridge Gap Waveguide Contactless Transition for Phased Array Antenna Front Ends

A Design Method and Application of Meta-Surface-Based Arbitrary Passband Filter for Terahertz Communication.

A meta-surface-based arbitrary bandwidth filter realization method for terahertz (THz) future communications is presented. The approach involves integrating a meta-surface-based bandstop filter into an ultra-wideband (UWB) bandpass filter and adjusting the operating frequency range of the meta-surface bandstop filter to realize the design of arbitrary bandwidth filters. It effectively addresses the complexity of designing traditional arbitrary bandwidth filters and the challenges in achieving impedance matching. To underscore its practicality, the paper employs silicon substrate integrated gap waveguide (SSIGW) and this method to craft a THz filter. To begin, design equations for electromagnetic band gap (EBG) structures were developed in accordance with the requirements of through-silicon via (TSV) and applied to the design of the SSIGW. Subsequently, this article employs equivalent transmission line models and equivalent circuits to conduct theoretical analyses for both the UWB passband and the meta-surface stopband portions. The proposed THz filter boasts a center frequency of 0.151 THz, a relative bandwidth of 6.9%, insertion loss below 0.68 dB, and stopbands exceeding 20 GHz in both upper and lower ranges. The in-band group delay is 0.119 ± 0.048 ns. Compared to reported THz filters, the SSIGW filter boasts advantages such as low loss and minimal delay, making it even more suitable for future wireless communication.

A Millimeter-Wave Broadband Multi-Mode Substrate-Integrated Gap Waveguide Traveling-Wave Antenna with Orbit Angular Momentum.

Orbit angular momentum (OAM) has been considered a new dimension for improving channel capacity in recent years. In this paper, a millimeter-wave broadband multi-mode waveguide traveling-wave antenna with OAM is proposed by innovatively utilizing the transmitted electromagnetic waves (EMWs) characteristic of substrate-integrated gap waveguides (SIGWs) to introduce phase delay, resulting in coupling to the radiate units with a phase jump. Nine "L"-shaped slot radiate elements are cut in a circular order at a certain angle on the SIGW to generate spin angular momentum (SAM) and OAM. To generate more OAM modes and match the antenna, four "Π"-shaped slot radiate units with a 90° relationship to each other are designed in this circular array. The simulation results show that the antenna operates at 28 GHz, with a -10 dB fractional bandwidth (FBW) = 35.7%, ranging from 25.50 to 35.85 GHz and a VSWR ≤ 1.5 dB from 28.60 to 32.0 GHz and 28.60 to 32.0 GHz. The antenna radiates a linear polarization (LP) mode with a gain of 9.3 dBi at 34.0~37.2 GHz, a l = 2 SAM-OAM (i.e., circular polarization OAM (CP-OAM)) mode with 8.04 dBi at 25.90~28.08 GHz, a l = 1 and l = 2 hybrid OAM mode with 5.7 dBi at 28.08~29.67 GHz, a SAM (i.e., left/right hand circular polarization (L/RHCP) mode with 4.6 dBi at 29.67~30.41 GHz, and a LP mode at 30.41~35.85 GHz. In addition, the waveguide transmits energy with a bandwidth ranging from 26.10 to 38.46 GHz. Within the in-band, only a quasi-TEM mode is transmitted with an energy transmission loss |S21| ≤ 2 dB.

Preface

In recent years, many delegates turned their attention to the fields of energy and power and put forward a series of constructive suggestions and recommendations on promoting the healthy development of the new energy generation industry and the green and low-carbon development of power, for example, “Building a new power system with new energy as the main body is an important task in the process of hitting carbon peak and attaining carbon neutrality, and new energy power generation will become the main force of future power supply.”In order to bring in the latest progress in theory, technology and application in the fields of energy and power at home and abroad in recent years, and show the latest research achievements, 2023 5th International Conference on Energy, Power and Grid (ICEPG 2023) was held in Guangzhou, China from September 22nd to 24th, 2023. It was attended by about 200 participants worldwide.The Conference presented an outstanding program of papers covering the most recent advances in energy and power, including Nuclear Engineering and Hydrogen Energy Resources, Power System Protection, Operation and Control, Power Quality and Electromagnetic Compatibility, Integrated Optics and Electro-Optical Devices, etc. The papers in this Proceedings published by Journal of Physics: Conference Series (JPCS) represent a collection of the invited speeches and other contributions.At this meeting we had a comprehensive overview of this fascinating field and of future scenarios thanks to the participation of distinguished delegates around the globe. The Conference was presided by Dr. Ziyu Chen from South China University of Technology, China. Professor Jizhong Zhu (South China University of Technology, China), the Conference Chair, first delivered an opening speech and then a keynote speech on Digital Power Grid Technology and Applications. What’s more, Prof. Wenjie Feng (South China University of Technology, China) performed a speech on Recent Progress of Millimeter-wave Circuits Using Groove Gap Waveguide Technology, Prof. Zhou Wu (Chongqing University, China) on Recurrent Neural Networks: Theoretical and Application Progress, and Assoc. Prof. Mahdi Deimi Dasht Bayaz (ITMO University, Russia) on Feasibility and Comparison of Using Integrated Solar-Base Systems for a Sample Residential Building in Various Climate Conditions. The participants raised questions based on the speeches and interacted with the speakers and people around, leading to a heated discussion on the latest research findings and trends in related fields.We would like to thank all the participants, especially those who contributed speeches, posters and manuscripts, for making ICEPG 2023 such an exciting and memorable conference. We thank the members of Technical Program Committee for putting together so outstanding a program. Finally, we acknowledge the staff of JPCS for their tireless efforts in the preparation of this volume, and all our colleagues whose friendly and efficient service contributed much to the success of the Conference.The Committee of ICEPG 2023List of Committee Member is available in this pdf.

Investigation of Gliding Walled Multilayer Waveguides

This article suggests a new waveguide design that utilizes a “walled” architecture. Instead of relying on conventional gap waveguide structures to create electronic bandgaps and prevent field leakage, the proposed design introduces a “walled” guiding mechanism. This technique preserves transmission while maintaining the multilayer approach and eliminates the need for nails or chemical bonds to attach the layers. Simulations were carried out in the W-band (75–110 GHz) and D-band (110–170 GHz) using several metals, and measurements were performed in the W-band using aluminum. The simulation results show that the reflection coefficient was less than −40 dB over the entire D-band. At the same time, the average insertion loss was around 0.0054 dB/mm and around 0.0065 dB/mm for silver and gold, respectively. Similarly, the reflection coefficient was less than −45 dB over the 75–110 GHz range, with an average insertion loss of 0.0018 dB/mm for silver and 0.003 dB/mm for gold, respectively. The aluminum model’s reflection coefficient was less than −35 dB, and the average insertion loss was 0.0035 dB/mm. The experimental results achieved a reflection coefficient of less than –30 dB and the average transmission coefficient was −0.2 dB, with an insertion loss of 0.002 dB/mm. The simple stacking ability of the weightless walled metal plates and easy fabrication makes the proposed transmission line a promising technology in mmWave and Terahertz applications.

Design of a graphene-based ridge gap waveguide coupler for THz applications

Design of a graphene-based ridge gap waveguide coupler for THz applications

A broadband 3-way power divider based on gap waveguide for Ka-band applications

The present study aims to design a broadband gap waveguide-based 3-way power divider in Ka-band. Gap waveguide technology is employed to remove serious challenges of fabrication in mmWave frequencies using printed and hollow waveguide technologies. The validation of proposed structure is performed with experimental measurements. There are better isolation and return loss between the output ports than around 20 dB over 27.4–35.1 GHz frequency range. There is less amplitude imbalance between the output ports than ± 0.42 dB. A close agreement exists between measured and simulated results. The results are beneficial for the design, fabrication, integration and expansion of mmWave components.

Millimeter Wave Wideband and Low-Loss Compact Power Divider Based on Gap Waveguide: For Use in Wideband Antenna Array System

Millimeter Wave Wideband and Low-Loss Compact Power Divider Based on Gap Waveguide: For Use in Wideband Antenna Array System

Contactless Air-Filled Substrate Integrated Cavity-Backed Slot Antenna Array With Improved Printed Ridge Gap Waveguide Feeding Network

Contactless Air-Filled Substrate Integrated Cavity-Backed Slot Antenna Array With Improved Printed Ridge Gap Waveguide Feeding Network

An mmWave dual-band integrated substrate gap waveguide single cavity filter with frequency selectivity

An mmWave dual-band integrated substrate gap waveguide single cavity filter with frequency selectivity

Millimeter-wave Quasi-elliptic Filters in Groove Gap Waveguide Technology Using Overmoded Cavity with Spurious Coupling Suppression for Next-generation SATCOM Applications

Millimeter-wave Quasi-elliptic Filters in Groove Gap Waveguide Technology Using Overmoded Cavity with Spurious Coupling Suppression for Next-generation SATCOM Applications

An Efficient Method for Calculating the Dispersion and Characteristic Impedance of Silicon Substrate-Integrated Gap Waveguide in Terahertz Band

An Efficient Method for Calculating the Dispersion and Characteristic Impedance of Silicon Substrate-Integrated Gap Waveguide in Terahertz Band

Millimeter-wave broadband dual-circularly polarized antenna based on gap waveguide technology

Millimeter-wave broadband dual-circularly polarized antenna based on gap waveguide technology

High-Order Resonating Cavity-Backed Slot Antenna Array Based on Contactless Air-Filled Substrate Integrated Waveguide and Transition to Inverted Grounded Coplanar Gap Waveguide

High-Order Resonating Cavity-Backed Slot Antenna Array Based on Contactless Air-Filled Substrate Integrated Waveguide and Transition to Inverted Grounded Coplanar Gap Waveguide

Vertically Polarized, Electromagnetic Interference Suppressed Millimeter-Wave Active Heatsink Antenna Based on Gap Waveguide Technology

Vertically Polarized, Electromagnetic Interference Suppressed Millimeter-Wave Active Heatsink Antenna Based on Gap Waveguide Technology