| 1. |
- Bondarik, Alexander, et al.
(författare)
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60 GHz Microstrip Antenna Array on PTFE Substrate
- 2012
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Ingår i: 6th European Conference on Antennas and Propagation (EUCAP), 2012. - 9781457709180 ; , s. 1016-1018
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Konferensbidrag (refereegranskat)abstract
- A microstrip antenna array design for 60 GHz central frequency is presented, with simulated and measured results in good agreement. The antenna is fabricated on a flexible substrate and intended for integration with circuit module to form a wireless communication system.
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| 2. |
- Bondarik, Alexander, et al.
(författare)
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A Bond Wire Connection Implementation at mm-Wave Active Microstrip Antenna
- 2019
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Ingår i: IEEE Microwave and Wireless Components Letters. - 1531-1309. ; 29:6, s. 427-429
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Tidskriftsartikel (refereegranskat)abstract
- A bond wire to microstrip line transition, featuring two impedance transformers, is presented for a mm-wave microstrip antenna and power amplifier (PA) integration using conventional bond wires. Simulated return loss bandwidth for the transition is 4 GHz with a minimum insertion loss of 1 dB. Measurement results for the designed active antenna are compared with measurements for a passive antenna and a standalone PA. The maximum gain is 29 dBi, compared with 16.7-dBi passive antenna maximum gain. The half-power gain bandwidth is 7%. The measured active antenna radiation pattern is in good agreement with simulations. The maximum deembedded PA output power is close to 9 dBm.
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| 3. |
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| 4. |
- Bondarik, Alexander, et al.
(författare)
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Gridded Parasitic Patch Stacked Microstrip Antenna With Beam Shift Capability for 60 GHz Band
- 2014
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- A microstrip antenna design is introduced in which a rectangular microstrip patch is coupled electromagnetically with a gridded rectangular patch placed above. The gridded patch consists of nine identical rectangular parts separated by a distance which is much smaller than a free space wavelength for a central frequency. The antenna is designed to operate in the 60 GHz band and is fabricated on a conventional PTFE (polytetrafluoroethylene) thin substrate. The antenna return loss bandwidth is comparable to a single parasitic patch aperture coupled antenna, while the proposed antenna gain is higher. Measurement results are in good agreement with simulation. Measured 10 dB return loss bandwidth is from 54 GHz up to 67 GHz. It fully covers the unlicensed band around 60 GHz. The measured antenna realized gain at 60 GHz is close to 8 dB, while the simulated antenna radiation efficiency is 85%. A simple beam shifting method is possible for this antenna structure by connecting adjacent outside parts in the gridded patch. The designed antenna is suitable for a high speed wireless communication system in particular for a user terminal in a fifth generation (5G) cellular network.
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| 5. |
- Bondarik, Alexander, et al.
(författare)
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Gridded parasitic patch stacked microstrip array antenna for 60 GHz band
- 2020
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Ingår i: IET Microwaves, Antennas and Propagation. - : Institution of Engineering and Technology (IET). - 1751-8725 .- 1751-8733. ; 14:8, s. 712-717
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Tidskriftsartikel (refereegranskat)abstract
- An array antenna design based on a gridded parasitic patch stacked microstrip antenna element is presented. The radiating part in the top layer of one antenna element has nine rectangular metal patches placed in a grid with three rows and three columns with a separation of 0.1 mm between the patches. Two means of realising the array are investigated. In a regular 2 × 2 concept, the parasitic patches of individual elements are placed next to each other, forming on the top layer a uniform grid of parasitic patches with six rows and six columns. In an alternative concept named as shared array, neighbouring antenna elements share one row and one column of parasitic patches, forming on the top layer a uniform grid of parasitic patches with five rows and five columns. The antenna arrays are designed for the 60 GHz band. The measured bandwidth is 13.8 GHz for the single antenna, 15.3 GHz for the 2 × 2 array, and 12.4 GHz for the shared array. The measured realised gain at 60 GHz is 6 dBi for the single antenna, 11 dBi for the 2 × 2 array, and 10.5 dBi for the shared array. The measured radiation patterns have good agreement with simulations.
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| 6. |
- Bondarik, Alexander, et al.
(författare)
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Implementation of UC-EBG Structure for 60 GHz Gridded Parasitic Patch Stacked Microstrip Antenna
- 2015
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Ingår i: 2015 9th European Conference on Antennas and Propagation (EuCAP). - 9788890701856 ; , s. 1-5
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Konferensbidrag (refereegranskat)abstract
- A uniplanar-compact electromagnetic band-gap (UC-EBG) structure is implemented at 60 GHz on a conventional PTFE (polytetrafluoroethylene) substrate. The structure surrounds a stacked microstrip antenna with gridded parasitic patch. The UC-EBG implementation results in about 5 dB decrease in the antenna E-plane normalized radiation pattern for angles along the substrate. The measured antenna gain increase at 60 GHz is 1.5 dB. Measured results are in good agreement with simulation. The design can be used for fifth generation (5G) wireless communication systems to reduce the antenna interference with other components.
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| 7. |
- Bondarik, Alexander, et al.
(författare)
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Investigation of Reconfigurability for a Stacked Microstrip Patch Antenna Pattern Targeting 5G Applications
- 2015
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Ingår i: 2015 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC). - 9781479978090 ; , s. 1-4
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Konferensbidrag (refereegranskat)abstract
- A pattern reconfigurable stacked microstrip patch antenna is presented for 60GHz central frequency. The antenna reconfigurability is realized using shorting pins in the antenna radiating aperture. Investigation is presented for different shorting pins locations. Influence on the antenna radiation pattern and return loss is studied. Measurement results for the antenna prototype agree with simulation results. The proposed antenna can be used in a next generation cellular systems.
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| 8. |
- Bondarik, Alexander, et al.
(författare)
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Microstrip antenna array integrated with 60 GHz band CMOS injection locked power amplifier
- 2016
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Ingår i: 2016 10th European Conference on Antennas and Propagation, EuCAP 2016. - 9788890701863
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Konferensbidrag (refereegranskat)abstract
- A microstrip antenna integration with a power amplifier is presented for the 60 GHz band. The antenna is a single layer 4×4 square patches array. The power amplifier is injection locked, designed in a 65 nm CMOS technology, with single-ended input and output signals. The integration is realized by means of bond wire connections. The antenna and the power amplifier are fabricated, characterized and measured separately. The integrated design is fabricated and measured, results are de-embedded to extract the power amplifier parameters and to compare with separate device measurements. At 56.5 GHz the integrated sample has about 12 dB gain increase with respect to the antenna sample without power amplifier. The presented design is targeting 60 GHz band wireless communication system applications.
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| 9. |
- Bondarik, Alexander
(författare)
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Microstrip Antennas for 60 GHz Band Application
- 2018
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- The next generation of mobile networks will exploit frequencies above 5 GHz and will use a wide available bandwidth for high speed data communication. At the time of writing this thesis work is ongoing to launch into the market a communication system operating between 25 GHz and 30 GHz. Following news about 40 GHz spectrum acquisition by telecommunication companies, it will be the next in turn. At the same time there is a continued interest on frequencies around 60 GHz, with potential applications not limited by mobile networks. The main reason for this development is that there is about 7 GHz of available unlicensed bandwidth around the world due to the electromagnetic waves absorption peak in the atmosphere.This dissertation is devoted to microstrip antenna design at 60 GHz band.The main challenge addressed in the thesis is a wideband antenna design withhigh directivity and efficiency to overcome the free space propagation loss andatmosphere attenuation. In addition, the presented antennas are suitable fora reliable fabrication and have small thickness, which might be critical for theantenna integration. A single antenna and an array antenna are designed andmanufactured. A wideband high gain antenna and an array design on a ceramicsubstrate, which is suitable for multilayer fabrication and system integration ispresented in Paper I. A novel gridded parasitic patch microstrip antenna designand fabrication on a polytetrauoroethylene substrate is presented in Paper II. Acomparison with similar conventional antenna designs is provided showing better characteristics for the designed antenna. During the antenna measurements the effect of surface waves propagation was identified. To suppress this unwanted radiation an electromagnetic band-gap structure around the antenna is designed and manufactured, the results are presented in Paper III. Two array antenna configurations for the gridded parasitic patch antenna are presented in Paper IV.The second topic of the dissertation is an investigation of reconfigurabilityof a gridded parasitic patch antenna pattern. The principles using switches andvaractors implementation are discussed in Paper II. The results of the proof-of concept fabrication using narrow metal strips imitating switch connection arepresented in Paper V. An implementation using Schottky diodes as switches ispresented in Section 5 of the introduction part of the thesis.The third topic of the dissertation is an antenna integration with a poweramplier using bond wires. In Section 6 of the introduction part a planar antennaarray integration with the injection locked power amplifier is presented. In Paper VI the same antenna is integrated with a two-stage power amplifier. Simulated and measured results are presented.
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| 10. |
- Bondarik, Alexander, et al.
(författare)
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Pattern Reconfigurable Wideband Stacked Microstrip Patch Antenna for 60 GHz Band
- 2016
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Ingår i: International Journal of Antennas and Propagation. - : Hindawi Limited. - 1687-5869 .- 1687-5877. ; 2016
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Tidskriftsartikel (refereegranskat)abstract
- A beam shift method is presented for an aperture coupled stacked microstrip antenna with a gridded parasitic patch. The gridded parasitic patch is formed by nine close coupled identical rectangular microstrip patches. Each of these patches is resonant at the antenna central frequency. Using four switches connecting adjacent parasitic patches in the grid, it is possible to realize a pattern reconfigurable antenna with nine different beam directions in broadside, H-plane, E-plane, and diagonal planes. The switches are modeled by metal strips and different locations for strips are studied. As a result an increase in the antenna coverage is achieved. Measurement results for fabricated prototypes correspond very well to simulation results. The antenna is designed for 60 GHz central frequency and can be used in high speed wireless communication systems.
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