Chalmers Research: Eva Rajo

2020

Ka band microstrip fed slot array antenna with PMC packaging

Carlos Sánchez-Cabello, Luis Fernando Herrán, Ashraf Uz Zaman et al

IET Microwaves, Antennas and Propagation. Vol. 14 (14), p. 1837-1845

Journal article

2019

Gap Waveguide Technology

Eva Rajo, Z. Sipus, Ashraf Uz Zaman

Surface Electromagnetics: With Applications in Antenna, Microwave, and Optical Engineering, p. 198-230

Book chapter

2018

Gap waveguide technology for millimeter-wave antenna systems

Eva Rajo, M. Ferrando-Rocher, Ashraf Uz Zaman

IEEE Communications Magazine. Vol. 56 (7), p. 14-20

Journal article

2015

Design of a Butler Matrix at 60GHz in Inverted Microstrip Gap Waveguide Technology

Astrid Algaba Brazalez, Eva Rajo

IEEE Antennas and Propagation Society, AP-S International Symposium (Digest). Vol. 2015-October, p. 2125-2126

Paper in proceeding

2015

Design of Millimeter-Wave Wideband Gap Waveguide Transitions Considering Integration into the Antenna System

Astrid Algaba Brazalez, Eva Rajo, Per-Simon Kildal

9th European Conference on Antennas and Propagation, EuCAP 2015, Lisbon, Portugal, 13-17 May 2015

Paper in proceeding

2015

Design and Validation of Microstrip Gap Waveguides and Their Transitions to Rectangular Waveguide, for Millimeter-Wave Applications

Astrid Algaba Brazalez, Eva Rajo, J.-L. Vazquez-Roy et al

IEEE Transactions on Microwave Theory and Techniques. Vol. 63 (12), p. 4035-4050

Journal article

2015

Design of a transition from WR-15 to microstrip packaged by gap waveguide technology

Astrid Algaba Brazalez, Eva Rajo, Per-Simon Kildal

ISAP 2014 - 2014 International Symposium on Antennas and Propagation, Conference Proceedings, Taiwan, 2-5 December 2014, p. 235-236

Paper in proceeding

2014

Investigation of Transitions for Use in Inverted Microstrip Gap Waveguide Antenna Arrays

Astrid Algaba Brazalez, Eva Rajo, Per-Simon Kildal

8th European Conference on Antennas and Propagation, EuCAP 2014, The Hague, The Netherlands 6-11 April 2014, p. 995 - 999

Paper in proceeding

2014

Planar Dual-Mode Horn Array with Corporate-Feed Network in Inverted Microstrip Gap Waveguide

Elena Pucci, Eva Rajo, J.-L. Vazquez-Roy et al

IEEE Transactions on Antennas and Propagation. Vol. 62 (7), p. 3534 - 3542

Journal article

2014

Prospective new PMC based gap waveguide shielding for microwave modules

Ashraf Uz Zaman, Eva Rajo, Per-Simon Kildal

IEEE International Symposium on Electromagnetic Compatibility, p. 459-463

Paper in proceeding

2013

Suppression of Parallel Plate Modes in Low Frequency Microstrip Circuit Packages Using Lid of Printed Zigzag Wires

Eva Rajo, Elena Pucci, A. A. Kishk et al

IEEE Microwave and Wireless Components Letters. Vol. 23 (7), p. 359-361

Journal article

2013

Design of a four-element horn antenna array fed by inverted microstrip gap waveguide

Elena Pucci, Eva Rajo, J.-L. Vazquez-Roy et al

IEEE Antennas and Propagation Society, AP-S International Symposium (Digest), p. 1226-1227

Paper in proceeding

2013

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

Elena Pucci, Ashraf Uz Zaman, Eva Rajo et al

IET Microwaves, Antennas and Propagation. Vol. 7 (11), p. 900-908

Journal article

2013

Design of a Dual-Mode Horn Element for Microstrip Gap Waveguide Fed Array

Elena Pucci, Eva Rajo, Per-Simon Kildal

7th European Conference on Antennas and Propagation, EuCAP 2013, Gothenburg, Sweden, 8-12 April 2013, p. 3086-3089

Paper in proceeding

2012

Evaluation of losses in microstrip gap waveguide for slot antennas applications

Elena Pucci, Eva Rajo, Per-Simon Kildal

IEEE Antennas and Propagation Society, AP-S International Symposium (Digest), p. 1-2

Paper in proceeding

2012

Packaging active and passive microwave circuits using a grid of planar conducting elements on a grid of vertically arranged substrates

Per-Simon Kildal, Ahmed Kishk, Eva Rajo

Patent application

2012

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

Eva Rajo, Per-Simon Kildal, Ashraf Uz Zaman et al

IEEE Transactions on Components, Packaging and Manufacturing Technology. Vol. 2 (10), p. 1623-1628

Journal article

2012

Enhancing the efficiency of compact patch antennas composed of split ring resonators by using lumped capacitors

Elena Pucci, Eva Rajo, Malcolm Ng Mou Kehn et al

IEEE Antennas and Wireless Propagation Letters. Vol. 11, p. 1362-1365

Journal article

2012

New Microstrip Gap Waveguide on Mushroom-Type EBG for Packaging of Microwave Components

Elena Pucci, Eva Rajo, Per-Simon Kildal

IEEE Microwave and Wireless Components Letters. Vol. 22 (3), p. 129-131

Journal article

2011

The gap waveguide as a metamaterial-based electromagnetic packaging technology enabling integration of MMICS and antennas up to THz

Per-Simon Kildal, Stefano Maci, Alejandro Valero-Nogueira et al

Proceedings of the 5th European Conference on Antennas and Propagation, EUCAP 2011. Rome, 11-15 April 2011, p. 3715-3718

Paper in proceeding

2011

Improving microstrip filters with gap waveguide packaging

Astrid Algaba Brazalez, Ashraf Uz Zaman, Elena Pucci et al

Proceedings of the 5th European Conference on Antennas and Propagation, EUCAP 2011. Rome, 11-15 April 2011, p. 1080-1084

Paper in proceeding

2011

Numerical studies of bandwidth of parallel-plate cut-off realised by a bed of nails, corrugations and mushroom-type electromagnetic bandgap for use in gap waveguides

Eva Rajo, Per-Simon Kildal

IET Microwaves, Antennas and Propagation. Vol. 5 (3), p. 282-289

Journal article

2011

Developing hard waveguides based on gap waveguide concept

Eva Rajo, Per-Simon Kildal, Stefano Maci

Metamaterials '2011, The Fifth International Congress on Advanced Elec-tromagnetic Materials in Microwaves and Optics, Barcelona, Spain, 10-15 October 2011

Paper in proceeding

2011

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

Per-Simon Kildal, Ashraf Uz Zaman, Eva Rajo et al

IET Microwaves, Antennas and Propagation. Vol. 5 (3), p. 262-270

Journal article

2011

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

Elena Pucci, Ashraf Uz Zaman, Eva Rajo et al

Proceedings of the 5th European Conference on Antennas and Propagation, EUCAP 2011. Rome, 11-15 April 2011, p. 979-982

Paper in proceeding

2011

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

Per-Simon Kildal, Ashraf Uz Zaman, Eva Rajo et al

URSI National Radio Science Meeting, Spokane, USA, 3-8 July, 2011

Paper in proceeding

2010

Groove gap waveguide - A rectangular waveguide between contactless metal plates enabled by parallel-plate cut-off

Eva Rajo, Per-Simon Kildal

EuCAP 2010 Fourth European Conference on Antennas and Propagation, Barcelona, 12-16 April 2010

Paper in proceeding

2010

Soft Surfaces for Reducing Mutual Coupling Between Loaded PIFA Antennas

Oscar Quevedo Teruel, L. Inclan-Sanchez, Eva Rajo

IEEE Antennas and Wireless Propagation Letters. Vol. 9, p. 91-94

Journal article

2010

On the Increase of the Efficiency and Bandwidth of Compact PIFAs based on SRR by Making Use of Lumped Capacitors

Oscar Quevedo Teruel, Malcolm Ng Mou Kehn, Elena Pucci et al

2010 IEEE International Symposium on Antennas and Propagation, Toronto, July 11-17, 2010

Paper in proceeding

2010

Design of microwave circuits in ridge gap waveguide technology

E. Alfonso, Mariano Baquero, Per-Simon Kildal et al

IEEE MTT-S International Microwave Symposium Digest, p. 1544 - 1547

Paper in proceeding

2010

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

Elena Pucci, Ashraf Uz Zaman, Eva Rajo et al

Gigahertz Symposium 2010, Lund University, 9-10 March 2010

Paper in proceeding

2010

Compact loaded PIFA for multifrequency applications

Oscar Quevedo Teruel, Elena Pucci, Eva Rajo

IEEE Transactions on Antennas and Propagation. Vol. 58 (3), p. 656-664

Journal article

2010

Progress report on developing the metamaterial EBG-based gap waveguide technology for millimeter and submillimeter waves

Per-Simon Kildal, Eva Rajo, Zvonimir Sipus et al

URSI Radio Science Meeting, Toronto, July 11-17, 2010

Paper in proceeding

2010

Concept of gap waveguide and measured results for first demonstrator

Ashraf Uz Zaman, Per-Simon Kildal, Eva Rajo et al

Gigahertz Symposium 2010, Lund University, 9-10 March 2010

Paper in proceeding

2010

Packaging of microstrip circuits using bed of springs to suppress cavity modes - a replacement for bed of nails

Eva Rajo, Per-Simon Kildal, A.A. Kishk

IEEE MTT 2010 International Microwave Symposium (IMS2010), Anaheim, CA, May 23-28, 2010, p. 405 - 408

Paper in proceeding

2010

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

Elena Pucci, Ashraf Uz Zaman, Eva Rajo et al

EuCAP 2010 Fourth European Conference on Antennas and Propagation, Barcelona, 12-16 April 2010

Paper in proceeding

2010

Packaging of active and passive microwave circuits using lid or bed of curved posts

A. Kishk, Per-Simon Kildal, Eva Rajo

Patent application

2010

EBG-based gap waveguide for applications up to THz

A.A. Kishk, Per-Simon Kildal, Eva Rajo et al

META'10, International Conference on Metamaterials, Photonic crystals and Plasmonics, Cairo, 22-25 February 2010

Paper in proceeding

2010

Dual-band microstrip patch antenna based on short-circuited ring and spiral resonators for implantable medical devices

C. J. Sanchez-Fernandez, Oscar Quevedo Teruel, J. Requena-Carrion et al

IET Microwaves, Antennas and Propagation. Vol. 4 (8), p. 1048-1055

Journal article

2010

Packaging of microstrip circuits using gap waveguide approach

Eva Rajo, Ashraf Uz Zaman, Per-Simon Kildal et al

Gigahertz Symposium 2010, Lund University, 9-10 March 2010

Paper in proceeding

2009

Theoretical and experimental challenges when developing the metamaterial EBG-based gap waveguide technology for millimeter and submillimeter wave circuitry

Per-Simon Kildal, Eva Rajo, Zvonimir Sipus et al

URSI National Radio Science Meeting, Charleston, USA, 1-5 June 2009

Paper in proceeding

2009

Planar Soft Surfaces and Their Application to Mutual Coupling Reduction

Eva Rajo, Oscar Quevedo Teruel, L. Inclan-Sanchez

IEEE Transactions on Antennas and Propagation. Vol. 57 (12), p. 3852-3859

Journal article

2009

Numerical and experimental studies of split ring resonators loaded on the sidewalls of rectangular waveguides

Oscar Quevedo Teruel, Eva Rajo, Malcolm Ng Mou Kehn

IET Microwaves, Antennas and Propagation. Vol. 3 (8), p. 1262-1270

Journal article

2009

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

Eva Rajo, Ashraf Uz Zaman, E. Alfonso et al

IEEE AP-S International Symposium on Antennas and Propagation, Charleston, USA, June 1-5, 2009

Paper in proceeding

2009

Cut-off bandwidth of metamaterial-based parallel plate gap waveguide with one textured metal pin surface

Eva Rajo, Per-Simon Kildal

Eucap 2009, 3rd European Conference on Antennas and Propagation - 23-27 March 2009 in Berlin, Germany, p. 33-36

Paper in proceeding

2009

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

Per-Simon Kildal, Eva Rajo, E. Alfonso et al

International Conference on Electromagnetics in Advanced Applications (ICEAA 2009), Torino, Italy, September 14-18, 2009. Vol. 1-2, p. 565-568

Paper in proceeding

2009

Design of Transition from Coaxial Line to Ridge Gap Waveguide

Ashraf Uz Zaman, Eva Rajo, E. Alfonso et al

2009 IEEE International Symposium on Antennas and Propagation and USNC/URSI National Radio Science Meeting, APSURSI 2009; North Charleston, SC; United States; 1 June 2009 through 5 June 2009

Paper in proceeding

2009

Local metamaterial-based waveguides in gaps between parallel metal plates

Per-Simon Kildal, E. Alfonso, A. Valero-Nogueira et al

IEEE Antennas and Wireless Propagation Letters. Vol. 8, p. 84-87

Journal article

2009

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

Eva Rajo, Ashraf Uz Zaman, Per-Simon Kildal

IEEE Microwave and Wireless Components Letters. Vol. 20 (1), p. 31-33

Journal article

2009

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

Ashraf Uz Zaman, Eva Rajo, Elena Pucci et al

Joint 5th ESA Workshop on Millimetre Wave Technology and Applications and 31st ESA Antenna Workshop on “Millimetre and sub-millimetre waves - From technologies to systems”, 18 - 20 May 2009, ESTEC, Noordwijk, The Netherlands

Paper in proceeding

2009

Challenges When Developing the New Wideband Metamaterial EBG-based Gap Waveguide Technology for Millimeter and Submillimeter Wave Applications

Per-Simon Kildal, Eva Rajo, Zvonimir Sipus et al

Joint 5th ESA Workshop on Millimetre Wave Technology and Applications and 31st ESA Antenna Workshop on “Millimetre and sub-millimetre waves - From technologies to systems”, 18 - 20 May 2009, ESTEC, Noordwijk, The Netherlands

Paper in proceeding

2008

Comparison of blockage widths of ideally hard cylinders of different cross-sectional shapes

M.J. Fernández, Eva Rajo, Per-Simon Kildal et al

2008 IEEE International Symposium on Antennas and Propagation and USNC/URSI National Radio Science Meeting, APSURSI; San Diego, CA; United States; 5 July 2008 through 12 July 2008

Paper in proceeding

2008

Blockage reduction of rhombic cylinders using meta-surfaces

Eva Rajo, J.-M. Fernandez, Per-Simon Kildal

2008 IEEE International Symposium on Antennas and Propagation and USNC/URSI National Radio Science Meeting, APSURSI; San Diego, CA; United States; 5 July 2008 through 12 July 2008

Paper in proceeding

2008

Comparison of bandwidths of mushroom-type EBG surfaces and corrugated and strip-type soft surfaces when used as narrow ground planes

Eva Rajo, Luis Inclan-Sanchez, Per-Simon Kildal

IET Microwaves, Antennas and Propagation

Journal article

2008

Blockage reduction in thick cylinders by shaping hard cross sections

Morocco, Eva Rajo, J.-M. Fernandez et al

META'08 & NATO Advanced Research Workshop on Metamaterials, Plasmonics and related Materials, 7-10 May, 2008, Marrakesh

Paper in proceeding

2007