| 1. |
- Alfonso Alos, Esperanza, 1979, et al.
(author)
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Gap waveguide components for millimeter-wave systems. Couplers, filters, antennas, MMIC packaging
- 2012
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In: IEEE Antennas and Propagation Society, AP-S International Symposium (Digest). - 1522-3965. - 9784885522703 ; , s. 243-246
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Conference paper (peer-reviewed)abstract
- Design of passive components (couplers, filters and antennas) and MMIC packaging validation intended for RF front ends for microwave links at 38 GHz using gap waveguide technology have been shown. The use of this technology allows all-in-one integration of receiver, transmitter, and diplexer including the antenna into one mechanical unit. These initial designs and studies have been made at the microwave band for validation and measurement purposes, and for comparison with existing technology. They represent the first step towards the application of gap waveguides to millimeter-wave systems, where gap waveguides could have a large potential.
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| 2. |
- Algaba Brazalez, Astrid, 1983, et al.
(author)
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Evaluation of losses of the ridge gap waveguide at 100 GHz
- 2013
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In: IEEE Antennas and Propagation Society, AP-S International Symposium (Digest). - 1522-3965. - 9781467353175 ; , s. 1456-1457
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Conference paper (peer-reviewed)abstract
- An evaluation of losses of the Ridge Gap Waveguide (r-GAP) at 100 GHz has been developed in terms of Quality Factor. For this aim, an r-GAP resonator has been designed, simulated and measured. The feeding to the circuit is provided via a transition from Micostrip-to-Ridge Gap Waveguide based in electromagnetic coupling in order to ensure compatibility with the available probe stations.
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| 3. |
- Algaba Brazalez, Astrid, 1983, et al.
(author)
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Improving microstrip filters with gap waveguide packaging
- 2011
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In: Proceedings of the 5th European Conference on Antennas and Propagation, EUCAP 2011. Rome, 11-15 April 2011. - 9781457702501 ; , s. 1080-1084
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Conference paper (peer-reviewed)abstract
- A study is presented of the performance of microstrip filters packaged with Perfect Magnetic Conductor (PMC) and realization of the PMC using a lid of nails. A 3rd order parallel coupled-line bandpass filter is designed and packaged with a lid of nails at the Ku-band. The study shows the PMC packaging technique is very efficient in improving the filter characteristics including the insertion loss in the bandpass region.
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| 4. |
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| 5. |
- Pucci, Elena, 1982
(author)
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Characterization of losses in ridge, groove and microstrip gap waveguides
- 2011
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Licentiate thesis (other academic/artistic)abstract
- The gap waveguide is a new technology that recently has been presented as an attractive candidate for applications at millimeter and sub millimeter waves. The waveguide is generated in the gap between a smooth upper metal plate and a ridge (or a groove) in a textured lower metal plate. Thedifference compared to standard technologies, such as waveguides and microstrip transmission lines, is that the gap waveguide can be made of only metal and can support propagating TEM or TE/TM modes without need of metal contact between the assembled blocks. This is possible because the ridge is surrounded by an artificial magnetic conductor (AMC) that creates a parallel plate cut-off region and forces the field to be confined soley alongthe ridge. The AMC can simply be realized with a textured surface of metal pins, but other realizations are also possible. This thesis is focused on two main tasks. Firstly, to present an experimental study of losses in ridge and groove gap waveguides, and secondly to show thedesign, experimental validation and loss study of a new type of gap waveguide, called microstrip gap waveguide, for low frequency applications. The losses are determined by studying the unloaded Q-factor of resonators madein gap waveguide technology. The Q-factor is known to be a measure of the loss in a resonant circuit, and it can therefore also be used to determine loss per length unit of waveguide resonators. In this thesis different resonator designs are presented for ridge, groove and microstrip gap waveguides. The Q-factor is directly calculated from the simulated or measured transmission coefficient of the resonators. The attenuation per length unit can be easilyobtained from the Q-factor for TEM-type waveguides, and the ridge and microstrip gap waveguides are quasi-TEM. The simulation results have been validated by measurements. The obtained Q-factors approach values of 4200 for the ridge gap resonator and 6000 for the groove gap resonator, compared to an ideally realized rectangular waveguide that has a Q of 8000. The ideally realized rectangular waveguide has no air gaps between joining metal parts and this cannot easily be achieved at high frequency. Any gap, even ifit is very small, destroys performance of the rectangular waveguide, and its Q-factor. The advantage of the gap waveguides is that the AMC pin surface totally removes any leakage from gaps between the two metal plates. We alsopropose a new geometry made in microstrip gap waveguide, using a textured surface with mushroom-type electromagnetic bandgap (EBG) structure, to create the parallel-plate cut-off. This circuit represents a compact, low lossand already packaged solution, that can suppress cavity modes and radiations generated when packaging standard microstrip lines.Keywords: Gap waveguides, Artificial Magnetic Conductors, Mushroom-Type EBG, Losses, Quality Factor, Waveguide Resonators, Packaging of Microwave Components, Microstrip Lines.
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| 6. |
- Pucci, Elena, 1982, et al.
(author)
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Contactless non-leaking waveguide flange realized by bed of nails for millimeter wave applications
- 2012
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In: Proceedings of 6th European Conference on Antennas and Propagation, EuCAP 2012. Prague, 26-30 March 2012. - 9781457709180 ; , s. 3533-3536
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Conference paper (peer-reviewed)abstract
- Waveguide flanges are typically used to connect and measure high frequency circuits. When good conductive contact is not provided between the joining flange surfaces, currents will flow between them, and thereby causing leakage and losses affecting the circuit performance. This work presents a non-leaking contactless waveguide flange made with bed of nails. The flange does not need any contact when connected to another smooth flange, since the pins surface and the smooth surface together form a stopband suppressing any current and wave propagation between the two joining surfaces of the flanges.
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| 7. |
- Pucci, Elena, 1982, et al.
(author)
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Design of a Dual-Mode Horn Element for Microstrip Gap Waveguide Fed Array
- 2013
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In: 7th European Conference on Antennas and Propagation, EuCAP 2013, Gothenburg, Sweden, 8-12 April 2013. - 9781467321877 ; , s. 3086-3089
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Conference paper (peer-reviewed)abstract
- The low loss microstrip gap waveguide provides an easy and suitable solution to be used as feed network for antennas at high frequency. This paper presents the design of a slot coupled dual-mode horn element fed by microstrip gap waveguide for array applications at 60 GHz. The directive dual mode horn is used to reduce the grating lobes which are generated when the slot array elements have a distance bigger than lambda. Simulation results of the proposed design are presented in terms of return loss and grating lobe level.
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| 8. |
- Pucci, Elena, 1982, et al.
(author)
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Design of a four-element horn antenna array fed by inverted microstrip gap waveguide
- 2013
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In: IEEE Antennas and Propagation Society, AP-S International Symposium (Digest). - 1522-3965. - 9781467353175 ; , s. 1226-1227
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Conference paper (peer-reviewed)abstract
- The paper presents the design of a four-element slot coupled dual-mode horn array with microstrip gap waveguide as feed network. We present simulated results for return loss for the feed network both with and without the radiating horn array. We also compare results for two ways to generate the stopband of the parallel-plate modes: the ideal Perfect Magnetic Conductor used during the initial design, and the real bed of nails used in the practical realization. The study is performed at 60 GHz obtaining about 10% bandwidth.
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| 9. |
- Pucci, Elena, 1982, et al.
(author)
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Enhancing the efficiency of compact patch antennas composed of split ring resonators by using lumped capacitors
- 2012
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In: IEEE Antennas and Wireless Propagation Letters. - 1548-5757 .- 1536-1225. ; 11, s. 1362-1365
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Journal article (peer-reviewed)abstract
- A new type of small patch antenna with low profile and enhanced radiation efficiency is proposed in this letter. The antenna is realized with a double layer of low-permittivity material (polypropylene, εr = 2.2). The lower layer is used for the feeding of the antenna, and split ring resonators (SRRs) are printed on top of the upper layer acting as radiating elements. The compactness is provided by shorting the rings to the ground plane with two metal pins. Although this antenna presented initially a dual band of operation, it has been demonstrated how the use of a lumped capacitor in the inner ring can increase the total radiation efficiency of the antenna performing a single-band response. Therefore, when the two original operation frequency bands coincide, a manufactured prototype of the antenna demonstrated a measured radiation efficiency of 73% that can be provided at the operation frequency of 1.29 GHz.
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| 10. |
- Pucci, Elena, 1982, et al.
(author)
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Evaluation of losses in microstrip gap waveguide for slot antennas applications
- 2012
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In: IEEE Antennas and Propagation Society, AP-S International Symposium (Digest). - 1522-3965. - 9781467304627 ; , s. 1-2
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Conference paper (peer-reviewed)abstract
- The new microstrip gap waveguide supports a quasi-TEM mode in the air by the use of artificial magnetic conductors which force the field to travel in the air rather than in the substrate. This paper presents an evaluation of losses by measuring the Q-factor of a resonator made in this technology, made using a mushroom-type EBG surface. Losses are crucial when using printed circuits to feed slot antennas, thereby motivating this work. Comparisons with standard microstrip lines will be provided, showing promising results.
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