| 1. |
- Albani, M, et al.
(author)
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Concepts for polarising sheets & “dual-gridded” reflectors for circular polarisation
- 2011
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In: 2010 Conference Proceedings ICECom, 20th International Conference on Applied Electromagnetics and Communications. - 9789536037582 - 9781612849980 ; , s. 1-4
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Conference paper (peer-reviewed)abstract
- C-, Ku- and Ka-band communications and broadcast satellites use so-called dual-gridded reflector antennas for linear polarisation to provide independent reflector surfaces and/or independent feeds for the two orthogonal polarisations. This paper describes initial work to extend this concept to circular polarisation. First we set up preliminary specifications and identify several antenna concepts based upon planar transmission sheet polarisers. Next we identify a number of polarisers of which the most promising is the meander-line, the L+C strip-grids and the parallel-plate polariser. Finally we review the conclusions of the analyses and preliminary designs of the sheet polarisers - on the antenna level as part of a reflector antenna system, on the polariser level, and on the sheet level inside the polariser.
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| 2. |
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| 3. |
- Bondarik, Alexander, et al.
(author)
-
60 GHz Microstrip Antenna Array on PTFE Substrate
- 2012
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In: 6th European Conference on Antennas and Propagation (EUCAP), 2012. - 9781457709180 ; , s. 1016-1018
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Conference paper (peer-reviewed)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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| 4. |
- Bondarik, Alexander, et al.
(author)
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A Bond Wire Connection Implementation at mm-Wave Active Microstrip Antenna
- 2019
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In: IEEE Microwave and Wireless Components Letters. - 1531-1309. ; 29:6, s. 427-429
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Journal article (peer-reviewed)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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| 5. |
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| 6. |
- Bondarik, Alexander, et al.
(author)
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Gridded parasitic patch stacked microstrip array antenna for 60 GHz band
- 2020
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In: IET Microwaves, Antennas and Propagation. - : Institution of Engineering and Technology (IET). - 1751-8725 .- 1751-8733. ; 14:8, s. 712-717
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Journal article (peer-reviewed)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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| 7. |
- Bondarik, Alexander, et al.
(author)
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Implementation of UC-EBG Structure for 60 GHz Gridded Parasitic Patch Stacked Microstrip Antenna
- 2015
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In: 2015 9th European Conference on Antennas and Propagation (EuCAP). - 9788890701856 ; , s. 1-5
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Conference paper (peer-reviewed)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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| 8. |
- Bondarik, Alexander, et al.
(author)
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Investigation of Reconfigurability for a Stacked Microstrip Patch Antenna Pattern Targeting 5G Applications
- 2015
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In: 2015 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC). - 9781479978090 ; , s. 1-4
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Conference paper (peer-reviewed)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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| 9. |
- Bondarik, Alexander, et al.
(author)
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Microstrip antenna array integrated with 60 GHz band CMOS injection locked power amplifier
- 2016
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In: 2016 10th European Conference on Antennas and Propagation, EuCAP 2016. - 9788890701863
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Conference paper (peer-reviewed)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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| 10. |
- Bondarik, Alexander, et al.
(author)
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Pattern Reconfigurable Wideband Stacked Microstrip Patch Antenna for 60 GHz Band
- 2016
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In: International Journal of Antennas and Propagation. - : Hindawi Limited. - 1687-5869 .- 1687-5877. ; 2016
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Journal article (peer-reviewed)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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