Ashraf Uz Zaman

2026

Dual-Band Filtering Slot Array Antenna for W-Band Application

High-Efficiency Substrate-Less Transition Technology From Waveguide to Chip for mm-Wave Active Modules

2025

All-Metallic-Metasurface-Based Wideband Dual Fabry-Perot Resonance Antenna Array with High Directivity and Polarization Purity

Development of a High-Efficiency Circularly Polarized Ka-Band Satcom Antenna Utilizing Ridge-loaded U-shaped Radiator

Symmetrical 1:4 Power Divider with Out-of-Phase Outputs Using Gapwave Guide Pins and Coupling Ridge with Iris at D-Band

A Steerable Dual-Polarized Monopulse Reflector Antenna With Gap-Waveguide Adaptive Phase Shifters for E-Band Backhaul

Dual-Band Slot Array Antenna for W-Band Application Based on Gap Waveguide

Compact Microstrip Line to Gap Waveguide Transition suitable for Beam Steering Antenna Applications at K-band

Wideband High Efficiency Slot Array Antenna Based on Gap Waveguide Single-Layer Feeding Network

2025

Gap Waveguide-Based MMIC Packaging Solutions for Compact RF Front-End Modules at 100 GHz

D-Band High Gain Planer Slot Array Antenna using Gap Waveguide Technology

2024

A high-gain gap waveguide-based 16 × 16 slot antenna array with low sidelobe level for mmwave applications

Compact Circularly Polarized Antenna based on Gapwaveguide for SATCOM Applications

A Comparative Study of Decoupling Techniques for Waveguide Slot Array Antennas

Low-cost Coaxial Slot Array Antenna for E-band Automotive Corner Radar Applications Based on Gap Waveguide MLW Technology

Antenna and Mechanical Co-Design for Auto-Beam-Tracking in Backhaul Systems

2024

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

A 50 dBi E-Band Dual-reflector Antenna for 5G Backhauling with Auto-beam-tracking Function

Analysis of Radiating Transverse Slot Unit Cell and Reflection Cancellation at D-Band

2024

W-Band Filtering Antenna Based on a Slot Array and Stacked Coupled Resonators Using Gap Waveguide Technology

Low-Cost Center-Fed Slot Array Based on Gap Waveguide MLW Coaxial Line Technology for E-band Automotive Radar

Wideband High-Efficiency Single-Layer Ridge Gap Waveguide Based Circular Polarized Magneto-Electric Dipole Antenna Array

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

1-Dimensional Wide Scanning Gap Waveguide Based Slot Array Antenna using Decoupling Technique for 100 GHz Applications

77-GHz Fully Polarimetric Antenna System With Compact Circularly Polarized Slots in Gap Waveguide for Automotive Radar

An Automotive Polarimetric Radar Sensor With Circular Polarization Based on Gapwaveguide Technology

E-Band Low-Loss Reconfigurable Phase Shifters

Design of a Gap Waveguide Based Unit Cell for 1-D Beam Scanning Application at W-band

Pattern Distributed Pins in Half-mode Groove Gap Waveguide for Stable Performance and Low Cost

Single Layer Antenna based on Gap Waveguide Technology with Dual-Circular Polarization for 60-GHz Band

High Gain Linearly Polarized 1D Beam Scanning Array Antenna based on Gap Waveguide Technology

Single Layer Dual Circularly Polarized Series-fed Gap Waveguide Based Slot Array for 77 GHz Automotive Radar

Low-Cost Ball-Pen Gap Waveguide With Nearly Zero Friction for Sliding Movements

2023

Design of a dual-CP gap waveguide fed aperture array antenna

A Gap Waveguide-Based D-Band Slot Array Antenna with Interdigital Feed Network

Substrate-Less Vertical Chip-to-Waveguide Transition for W-Band Array Antenna Integration

A Multi Beam Slot Array Antenna Fed by Contactless Multi-Layered 4x8 Buttler Matrix Using Gap Waveguide Technology for 60GHz Fixed Wireless Access Applications

2023

Gapwaveguide Automotive Imaging Radar Antenna with Launcher in Package Technology

Applications of Contactless Characteristics of Gap Waveguides in Mechanical Reconfigurability

2023

Multilayer Dry Film Photoresist Fabrication of a Robust >100 GHz Gap Waveguide Slot Array Antenna

A Dual-Circularly Polarized Gap Waveguide-Based Linear Array Antenna for 60 GHz-Band

A Multi Beam Slot Array Antenna Fed by Contactless Multi-Layered 4×8 Buttler Matrix Using Gap Waveguide Technology for 60GHz Fixed Wireless Access Applications

2023

A Millimeter-Wave Six-Port Junction Based on Ridge Gap Waveguide

A 2 × 2 Ka-Band Wideband Circularly Polarized Sub-Array Antenna Based on U-shaped Slots and Gap Waveguide Technology

2022

Dual-Polarized Highly Folded Bowtie Antenna with Slotted Self-Grounded Structure for Sub-6 GHz 5G Applications

Using a Conical Horn as Compact Antenna Test Range Feed in Millimetre Bands

An E-band Reconfigurable Phase Shifter Based on Gap Waveguide

Using a Conical Horn as Compact Antenna Test Range Feed in Millimetre Bands

2022

Micromachined Wideband Ridge Gap Waveguide Power Divider at 220-325 GHz

Design of Dual Circularly Polarized Inclined Slot Pair Based on Stepped-Height Ridge Gap Waveguide with Series Excitation

A Single Layer Dual-Polarization Array Antenna Based on Parallel Plate Gap Waveguide

Monopulse Feeding Network Based on New Gap Waveguide Planar Magic-Tees

2022

A Compact Gap-Waveguide Dual-Polarized Ka-Band Feed for 50dBi Reflector Antennas With Tracking Function

2022

Design and development of broadband gap waveguide-based 0-dB couplers for Ka-band applications

Single Layer Dual Circularly Polarized Antenna Array Based on Ridge Gap Waveguide for 77 GHz Automotive Radar

Dual-Circularly Polarized Array Antenna Based on Gap Waveguide Utilizing Double-grooved Circular Waveguide Polarizer

A 60 GHz-Band 4x4 Butler Matrix Based on Ridge Gap Waveguide

Novel Integration Techniques for Gap Waveguides and MMICs Suitable for Multilayer Waveguide Applications

A 60 GHz-Band 4×4 Butler Matrix Based on Ridge Gap Waveguide

High Gain and Fixed Broadside radiation at 140GHz Band by a Leaky Wave Slotted Waveguide

Low Loss Gap Waveguide Transmission line and Transitions at 220-320 GHz Using Dry Film Micromachining

Ultra-Wideband Millimeter-wave Planar Array Antenna with an Upside-down Structure of Printed Ridge Gap Waveguide for Stable Performance and High Antenna Efficiency

2021

A Dual Circularly Polarized Array Antenna for Ka-Band Satellite Communications

Millimeter-Wave Vertical Transitions between Ridge Gap Waveguides and Microstrip Lines for Integration of MMIC with Slot Array

Micromachined Ridge Gap Waveguide Transmission Line and Transition at 220-310 GHz

Compact Low-Loss Chip-to-Waveguide and Chip-to-Chip Packaging Concept Using EBG Structures

3D Printed Periodic Structures for RF Packaging of Integrated Array Module at sub-6GHz Band

High-performance UWB mmWave smart bowtie array antenna technology for 5G access and backhauling systems

Millimeter-Wave Ultrawideband Circularly Polarized Planar Array Antenna Using Bold-C Spiral Elements with Concept of Tightly Coupled Array

2021

Single Layer Dual Circularly Polarized Antenna Elements for Automotive Radar at 77 GHz

An unequal power divider based on ridge gap waveguide with an inserted conductor plate

2021

Realizing a 140 GHz Gap Waveguide–Based Array Antenna by Low-Cost Injection Molding and Micromachining

D-band waveguide-to-microstrip transition implemented in eWLB packaging technology

Packaging Technique of Highly Integrated Circuits Based on EBG Structure for +100 GHz Applications

A Series-fed High-Gain Gap Waveguide Planar Array Antenna Fed by Quasi-TEM Wave

Ultra-wideband linearly polarised planar bowtie array antenna with feeding network using dielectric-based inverted microstrip gap waveguide

Fully-Planar Ultrawideband Tightly-Coupled Array (FPU-TCA) with Integrated Feed for Wide-Scanning Millimeter-Wave Applications

A Compact Double-Layer Groove Gap Waveguide Power Divider with High Isolation

A V-Band Low Sidelobe Cavity-Backed Slot Array Antenna Based on Gap Waveguide

Ka band microstrip fed slot array antenna with PMC packaging

Oil, water, and ice detection on road surfaces with a millimeter-wave radiometer

2020

A wideband 3-dB directional coupler in GGW for use in V-Band communication systems

Planar H-Plane Horn Antenna Based on Groove Gap Waveguide Technology

Groove Gap Waveguide Filter Based on Horizontally Polarized Resonators for V-Band Applications

Road Surface Characterization Using a Radiometer at 100 GHz

Nongalvanic Generic Packaging Solution Demonstrated in a Fully Integrated D-Band Receiver

A Method of Reducing Mutual Coupling for a Finite Array

A Simple Asymmetric Orthomode Transducer Based on Groove Gap Waveguide

2019

Two Types of High Gain Slot Array Antennas based on Ridge Gap Waveguide in the D-Band

An Unequal Power Divider Based on Ridge Gap Waveguide

D-Band Slot Array Antenna Using Combined Ridge and Groove Gap Waveguide Feeding Network

2019

A Slot Array Antenna with Single-Layered Corporate-Feed based on Ridge Gap Waveguide in the 60-GHz Band

2019

A Method of Reducing Mutual Coupling Using an Extra Coupling Path

Ultrawide Band Tightly-Coupled Aperture Magneto-Electric Dipole Array over 20 - 40 GHz

2019

An E-band Compact Frequency Division Duplex Radio Front-end Based on Gap Waveguide Technology

2019

Wideband Sub-6 GHz Self-Grounded Bow-Tie Antenna with New Feeding Mechanism for 5G Communication Systems

Overview of High Frequency Electronics Integration Concepts for Gap waveguide based High Gain Slot Antenna Array

5G mmWave Beam Steering Antenna Development and Testing

A Low Sidelobe Double-Layer Corporate-Feed Array Antenna by Inverted Microstrip Gap Waveguide at 28 GHz

Polymer based 140 GHz Planar Gap Waveguide Array Antenna for Line of Sight (LOS) MIMO Backhaul Links

A Low Sidelobe Double-Layer Corporate-Feed Array Antenna by Inverted Micro strip Gap Waveguide at 28 GHz

2019

Compact Integrated Full-Duplex Gap Waveguide-Based Radio Front End For Multi-Gbit/s Point-to-Point Backhaul Links at E-Band

2019

Design of a 38 dBi Slot Array on Gap Waveguide at 140 GHz

Gap Waveguide Technology

2019

8 x 8 Ka-Band Dual-Polarized Array Antenna Based on Gap Waveguide Technology

2019

Wideband Dual-polarized Array Antenna on Dielectric-based Inverted Microstrip Gap Waveguide

Ultra-wideband Circularly Polarized Planar Array Antenna Using Single-Arm-Spiral Elements and Dielectric-based IMGW

2019

Design and Fabrication of Wideband Millimeter-Wave Directional Couplers with Different Coupling Factors Based on Gap Waveguide Technology

A D-Band Center-Feed Linear Slot Array Antenna Based on Gap Waveguide

Capacity Gains of (3 × 3)×(3 × 3) MIMO Fixed Links with Planar Aperiodic Sparse Arrays in Pure-LOS Channels

A V-band branch guide 3-dB Coupler based on gap waveguide for use in antenna array

Millimeter wave Microstrip Fed Slot Array Antenna with PMC Packaging for Future 5G Systems

Millimeter wave high gain antenna based on gap waveguide technology

2018

An Integrated Ka-Band Diplexer-Antenna Array Module Based on Gap Waveguide Technology With Simple Mechanical Assembly and No Electrical Contact Requirements

2018

PCB Based UWB mm-Wave Smart Capped Bowtie Array for 5G Communication Systems

A wideband high-gain and high-efficiency slot array antenna based on groove gap waveguide

2018

Simple and Broadband Transition Between Rectangular Waveguide and Groove Gap Waveguide for mm-Wave Applications

A Planar Single-Polarized Ultra-Wideband Antenna Element for Millimeter-Wave Phased Array

A mmWave Wideband Slot Array Antenna Based on Ridge Gap Waveguide With 30% Bandwidth

Gap waveguide technology for millimeter-wave antenna systems

2018

Design of A Wideband Array Antenna Prototype with Gap Waveguide for W-Band Wireless Links

A compact phase shifter in groove gap waveguide for millimeter-wave applications

2018

W-Band Low-Profile Monopulse Slot Array Antenna Based on Gap Waveguide Corporate-Feed Network

2018

A New Calibration Kit for VNA Measurements of General Microstrip Line Devices Using Gap Waveguide Technology

2018

Design of Wideband Slot Array Antenna by Groove Gap Waveguide in Millimeter Waves

Capacitive-coupled groove gap waveguide filter

140 GHz Planar Gap Waveguide Array Antenna for Line of Sight (LOS) MIMO Backhaul Links

Gap waveguide based 1-D steerable beam antenna concept for millimeter-wave 5G application

2018

Zero-Gap Waveguide: A Parallel Plate Waveguide With Flexible Mechanical Assembly for mm-Wave Antenna Applications

Towards Integrated Active Antennas for 5G mm-wave Applications at Gapwaves

2018

Study of Dielectric Loss and Conductor Loss among Microstrip, covered Microstrip and inverted Microstrip Gap Waveguide utilizing variational Method in Millimeter Waves

2018

Bandwidth Investigation on Half-Height Pin in Ridge Gap Waveguide

2018

Analytical Solutions to Characteristic Impedance and Losses of Inverted Microstrip Gap Waveguide Based on Variational Method

2017

Design and Fabrication of a High Gain 60-GHz Cavity-backed Slot Antenna Array fed by Inverted Microstrip Gap Waveguide

2017

A High-Gain High-Efficiency Corporate-Fed Slot Array Antenna directly Fed by Ridge Gap Waveguide at 60-GHz

2017

Novel Low-Loss Millimeter- Wave Transition From Waveguide-to-Microstrip Line Suitable for MMIC Integration and Packaging

2017

Novel Millimeter Wave Transition From Microstrip Line to Groove Gap Waveguide for MMIC Packaging and Antenna Integration

2017

Wideband cavity-backed slot subarray with gap waveguide feed-network for D-band applications

2017

A dual-polarized slotted-waveguide antenna based on gap waveguide technology

2017

E-band 3-D metal printed wideband planar horn array antenna

2017

Pick and place assembly technique for fabrication of groove gapwaveguide resonator

An E-band Antenna-diplexer Compact Integrated Solution Based on Gap Waveguide Technology

2017

60-GHz Groove Gap Waveguide Based Wideband H-Plane Power Dividers and Transitions: For Use in High-Gain Slot Array Antenna

2017

Diplexer integration into a Ka-band high-gain gap waveguide corporate-fed slot array antenna

Design of a double layer cavity backed slot array antenna in gap waveguide technology

2017

Slot Antenna Array Unit Cell Directly Fed by Inverted Microstrip Gap Waveguide

2017

Ridge gap waveguide slot antenna array with 30% bandwidth for 60-GHz applications

Realisation of carved and iris groove gap waveguide filter and E-plane diplexer for V-band radio link application

2017

A Ridge Gap Waveguide fed apperture-coupled microstrip antenna array for 60 GHz applications

2017

Millimeter wave contactless microstrip-gap waveguide transition suitable for integration of RF MMIC with gap waveguide array antenna

2017

A GapWaveguide-Fed Wideband Patch Antenna Array for 60-GHz Applications

Millimeter wave wideband high gain antenna based on gap waveguide technology

2017

Design of 8 × 8 Slot Array Antenna based on Inverted Microstrip Gap Waveguide

2017

A Wideband Contactless and Bondwire-Free MMIC to Waveguide Transition

Demonstration of a micromachined planar distribution network in gap waveguide technology for a linear slot array antenna at 100 GHz

2016

Millimeter Wave E-Plane Transition From Waveguide to Microstrip Line With Large Substrate Size Related to MMIC Integration

2016

Design and Fabrication of a High-Gain 60-GHz Corrugated Slot Antenna Array With Ridge Gap Waveguide Distribution Layer

Micromachined Linear Slot Array Antenna for 100 GHz with 10 dB Gain Using GAP Waveguide Technology

2016

In memory of Professor Per-Simon Kildal

2016

Design of transition from WR-15 to inverted microstrip gap waveguide

2016

Mm-Wave contactless connection for MMIC integration in gap waveguides

2016

Corporate distribution networks for slot array antenna based on groove gap waveguide technology

2016

Different gap waveguide slot array configurations for mmwave fixed beam antenna application

2016

Optimizing the numerical port for inverted microstrip gap waveguide in full-wave simulators

2016

Design of a Cavity-backed Slot Array Unit Cell on Inverted Microstrip Gap Waveguide

GAP waveguides

2016

A high gain ridge gap waveguide fed slot antenna array for 60 GHz applications

2016

W-band spatial power combiner and splitter in gap waveguide technology

2016

Spatial Power Combining and Splitting in Gap Waveguide Technology

2015

A groove gap Waveguide Iris Filter for V-band Application

2015

V-Band Groove Gap Waveguide Diplexer

2015

A New 2x2 Microstrip Patch Sub-array for 60GHz Wideband Planar Antenna with Ridge Gap Waveguide Distribution Layer

2014

Prospective new PMC based gap waveguide shielding for microwave modules

Micromachined gap waveguide devices for above 100 GHz

2014

Wide-Band Slot Antenna Arrays With Single-Layer Corporate-Feed Network in Ridge Gap Waveguide Technology

MICROMACHINED GAP WAVEGUIDE DEVICES FOR ABOVE 100 GHZ

2014

Gap Waveguide PMC Packaging for Improved Isolation of Circuit Components in High-Frequency Microwave Modules

2014

60GHz Slot-Array Antenna Design Based on Gap Waveguide Cavity and Gap Waveguide Feed

2013

Micromachined Groove Gap Waveguides for 100 GHz applications

2013

Ka-Band Gap Waveguide Coupled-Resonator Filter for Radio Link Diplexer Application

2013

Design of a simple transition from microstrip to ridge gap waveguide suited for MMIC and antenna integration

Packaging of MMIC by using gap waveguide and design of a microstrip to ridge gap waveguide transition

Micromachined gap waveguides for 100 GHz applications

2013

Ku band linear slot-array in ridge gapwaveguide technology

2013

Gap Waveguide: Low Loss Microwave Passive Components and MMIC Packaging Technique for High Frequency Applications

2013

Study of Q-Factors of Ridge and Groove Gap Waveguide Resonators

Linear slot array design in ridge gap waveguide technology

SU8 Ridge Gap Resonator

2012

Gap waveguide components for millimeter-wave systems. Couplers, filters, antennas, MMIC packaging

Micromachined Ridge Gap Waveguide and Resonator for Millimeter-Wave Applications

2012

Slot antenna in ridge gap waveguide technology

2012

Bed of Springs for Packaging of Microstrip Circuits in the Microwave Frequency Range

Micromachined Ridge Gap Waveguide and Resonator for 220-325 GHz

2012

Design of a coplanar waveguide-to-ridge gap waveguide transition via capacitive coupling

2012

Numerical Prepackaging with PMC Lid - Efficient and Simple Design Procedure for Microstrip Circuits Including the Packaging

2012

Metamatrial based packaging method for improved isolation of circuit elements in microwave modules

2012

Improved Microstrip Filters Using PMC Packaging by Lid of Nails

2012

Narrow-Band Microwave Filter Using High-Q Groove Gap Waveguide Resonators With Manufacturing Flexibility and No Sidewalls

2012

Investigation of a Microstrip-to-Ridge Gap Waveguide transition by electromagnetic coupling

2011

Micromachined ridge gap waveguide for sub millimeter and millimeter wave applications

2011

Improving microstrip filters with gap waveguide packaging

Gap Waveguide for High Frequency Microwave Application- Validation of Concept, Filter Design & Packaging Aspects

Design of Micromachined Ridge Gap Waveguides for Millimeter-Wave Applications

2011

Design and experimental verification of ridge gap waveguides in bed of nails for parallel plate mode suppression

2011

New low loss inverted microstrip line using gap waveguide technology for slot antenna applications

2011

Design of Band-Pass Filter Using Gap Waveguide Technology

2011

Progress report on developing metamaterial EBG-based gap waveguide components and packaging solutions between 1 GHz and several 100 Ghz

2011

Increasing parallel plate stop-band in gap waveguides using inverted pyramid-shaped nails for slot array application above 60GHz

Q-factor comparisons between new gap waveguide technology and standard rectangular waveguide

2010

Cryogenic integration of 2-14 GHz Eleven Feed in wideband receiver for VLBI 2010

Using lid of pins for packaging of microstrip board for descrambling the ports of Eleven antenna for radio telescope applications

Design of cryogenic 2-14 GHz Eleven feed for reflector antennas for future radio telescopes

Cryogenic 2-14GHz low noise receiver for radio astronomy using Eleven feed

Packaging of microstrip circuits using gap waveguide approach

Concept of gap waveguide and measured results for first demonstrator

Losses in ridge gap waveguide compared with rectangular waveguide and microstrip lines

Validation of ridge gap waveguide performance using in-house TRL calibration kit

Alternative ridge gap waveguide design using a mushroom-type EBG surface

Design of Transition from Coaxial Line to Ridge Gap Waveguide

Design of Transitions and Calibration Kit in New Wideband Metamaterial-based Gap Waveguide Transmission Line Technology For Millimeter and Submillimeter Waves

Wideband, lowloss, low-cost, quasi-TEM metamaterial-based local waveguides in air gaps between parallel metal plates

Parallel plate cavity mode suppression in microstrip circuit packages using a lid of nails

Dual polarised microstrip patch antenna with high port isolation