The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Pertti Vainikainen - One of the best experts on this subject based on the ideXlab platform.
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inherently non resonant multi band Mobile Terminal antenna
Electronics Letters, 2013Co-Authors: Risto Valkonen, Janne Ilvonen, Clemens Icheln, Pertti VainikainenAbstract:An inherently non-resonant capacitive coupling element antenna for Mobile handsets is presented. The compact antenna includes a simple coupling element with a novel multi-band matching circuit for simultaneous 698-960 and 1710-2690 MHz operation. Experimental results show that the antenna performs strongly in comparison to the current state-of-the-art in Mobile Terminal antennas, and that the non-resonant antenna is a competitive choice for Mobile Terminals.
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Mobile Terminal antenna performance with the user s hand effect of antenna dimensioning and location
IEEE Antennas and Wireless Propagation Letters, 2011Co-Authors: Janne Ilvonen, Jari Holopainen, Olli Kivekäs, Risto Valkonen, Kimmo Rasilainen, Pertti VainikainenAbstract:This letter reports a systematic simulation study of the performance of Mobile Terminal antennas in the vicinity of the user's hand. The effects of antenna dimensioning and antenna location on the ground plane of the device are demonstrated. The studied performance parameters are quality factor, radiation efficiency, and frequency detuning. Based on the results, beneficial approaches and general guidelines for antenna designs with a reduced effect of the user's hand can be given. For instance, it is shown that the radiation efficiency with the user's hand stays nearly constant (variation <;0.2 dB) despite the changes in the antenna element height (2-6.6 mm at 900 and 2000 MHz).
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Ambiguity analysis of isolation - based multi-antenna structures on Mobile Terminal
2011Co-Authors: A. A. H. Azremi, Mario Costa, Visa Koivunen, Pertti VainikainenAbstract:This paper presents a comprehensive numerical study on the ambiguities for different isolation-based multi-antenna structures. The focus is on four-element planar inverted-F antennas (PIFA) array on a typical 100mm × 40mm Mobile Terminal chassis operating at 3500 MHz. The study is conducted by taking into account the effects of antenna isolation, mutual coupling between Mobile Terminal chassis and antenna element, and mutual coupling among antenna elements. The results show that the studied multi-antenna structures with low-isolation level, i.e. when there exist high mutual coupling among antenna elements, are less ambiguous. With such observations, a novel eight-element PIFA array has been designed for radio direction finding (RDF) applications on a Mobile Terminal.
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broadband equivalent circuit model for capacitive coupling element based Mobile Terminal antenna
IEEE Antennas and Wireless Propagation Letters, 2010Co-Authors: Jari Holopainen, Olli Kivekäs, Risto Valkonen, Janne Ilvonen, Pertti VainikainenAbstract:In this letter, it is shown how the behavior of a capacitive coupling element (CCE)-based Mobile Terminal antenna can be modeled at the UHF band as a combination of the separate wavemodes of the structure. The proposed equivalent circuit model improves the general understanding of the operation of the antenna structure. It can be used for analyzing the combined performance of the capacitive coupling element and Terminal chassis, but it also helps in analyzing how different parts of the antenna structure contribute to the impedance and radiation.
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optimum dual resonant impedance matching of coupling element based Mobile Terminal antenna structures
Microwave and Optical Technology Letters, 2007Co-Authors: Juha Villanen, Pertti VainikainenAbstract:This article presents a theoretical study on optimum dual-resonant impedance matching of coupling element based Mobile Terminal antenna structures. First, optimum tuning of the system of two series-resonant circuits connected to each other with an ideal impedance transformer and an impedance inverter is studied. Simple, explicit equations are derived for optimum circuit parameters of the resonator system. After this, design rules are presented for a practical discrete-component realization of a matching circuitry specifically optimized for nonresonant antenna structures. Special emphasis has been put on minimizing the complexity of the matching network. Discussion is also given on equivalent circuit modeling of the combination of chassis and a coupling element. The presented matching network design methodology is shown to work well when applied with a realistic coupling element based Mobile Terminal antenna structure. The results of this article also indicate that the combination of the chassis of a Mobile Terminal and a simple coupling element can be with a good enough accuracy approximated as a series-RLC equivalent circuit. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2472–2477, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22762
Zhao Anping - One of the best experts on this subject based on the ideXlab platform.
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the millimeter wave dual polarization slot antenna system and the Mobile Terminal are suitable for 5g communication
2019Co-Authors: Wu Shengjie, Zhao AnpingAbstract:The utility model discloses a millimeter wave dual-polarization slot antenna array system suitable for 5G communication and a Mobile Terminal. The antenna array system comprises at least four antennaunits which are arranged at intervals. The antenna unit comprises a metal grounding plate and an antenna assembly. The antenna assembly comprises a first metal frame. First dielectric substrate, Firstfeed branch, Second feed branch, wherein the dielectric ring is matched with the metal piece; the metal piece is arranged in the dielectric ring; the first metal frame is provided with a first groovematched with the dielectric ring; wherein the dielectric ring is arranged in the first groove, the first feed branch and the second feed branch are correspondingly arranged, one end of the first feedbranch is arranged at an included angle of 90 degrees relative to one end of the second feed branch, and the other end of the first feed branch is arranged in parallel relative to the other end of the second feed branch. The method is suitable for full-screen equipment, and is also suitable for equipment with a metal rear shell or a metal frame.
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millimeter wave dual polarized slot antenna system and Mobile Terminal suitable for 5g communication
2018Co-Authors: Wu Shengjie, Zhao AnpingAbstract:The invention discloses a millimeter wave dual polarization slot antenna array system and a Mobile Terminal suitable for 5G communication, the antenna array system includes at least four spaced apartantenna elements, each antenna unit includes a metal ground plane and an antenna assembly, the antenna assembly includes a first metal frame, a first dielectric substrate, a first feed branch, a second feed branch, a metal member and a dielectric ring adapted to the metal member, the metal part is arranged in the dielectric ring, the first metal frame is provided with a first groove adapted to thedielectric ring, The dielectric ring is arranged in the first groove, the first feeding branch is arranged corresponding to the second feeding branch, and one end of the first feeding branch is arranged at an included angle of 90 DEG with respect to one end of the second feeding branch, and the other end of the first feeding branch is arranged in parallel with the other end of the second feedingbranch. The millimeter wave dual polarization slot antenna array system is applicable to both full screen equipment and equipment with a metal rear case or metal frame.
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double polarization millimeter wave antenna system and Mobile Terminal suitable for 5g communication
2018Co-Authors: Wu Shengjie, Zhao AnpingAbstract:The utility model discloses a double polarization millimeter wave antenna system and Mobile Terminal suitable for 5G communication, antenna system include the antenna element that six at least interval set up, antenna element is including the radiation main part and guide the structure into, the radiation main part includes first dielectric layer, primary radiation portion, first feed branch, second feed branch, third feed branch and fourth feed branch, it includes second dielectric layer, the first portion of guiding into and the second portion of guiding into to guide the structure into. Guide the structure into and need not to carry out the feed, simplified antenna system, be favorable to reduce cost, guide into the structure can to the radiation main part + 45 draws 45 two not the samecontributions of co -polar pattern production realize that the wide angle covers and the directional diagram uniformity of two kinds of polarization of antenna system is good, the utility model discloses an antenna system area occupied is little, need not set up the headroom, and antenna system can set up on a complete metal grounding plate, is applicable to full surface screen equipment.
Wu Shengjie - One of the best experts on this subject based on the ideXlab platform.
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the millimeter wave dual polarization slot antenna system and the Mobile Terminal are suitable for 5g communication
2019Co-Authors: Wu Shengjie, Zhao AnpingAbstract:The utility model discloses a millimeter wave dual-polarization slot antenna array system suitable for 5G communication and a Mobile Terminal. The antenna array system comprises at least four antennaunits which are arranged at intervals. The antenna unit comprises a metal grounding plate and an antenna assembly. The antenna assembly comprises a first metal frame. First dielectric substrate, Firstfeed branch, Second feed branch, wherein the dielectric ring is matched with the metal piece; the metal piece is arranged in the dielectric ring; the first metal frame is provided with a first groovematched with the dielectric ring; wherein the dielectric ring is arranged in the first groove, the first feed branch and the second feed branch are correspondingly arranged, one end of the first feedbranch is arranged at an included angle of 90 degrees relative to one end of the second feed branch, and the other end of the first feed branch is arranged in parallel relative to the other end of the second feed branch. The method is suitable for full-screen equipment, and is also suitable for equipment with a metal rear shell or a metal frame.
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millimeter wave dual polarized slot antenna system and Mobile Terminal suitable for 5g communication
2018Co-Authors: Wu Shengjie, Zhao AnpingAbstract:The invention discloses a millimeter wave dual polarization slot antenna array system and a Mobile Terminal suitable for 5G communication, the antenna array system includes at least four spaced apartantenna elements, each antenna unit includes a metal ground plane and an antenna assembly, the antenna assembly includes a first metal frame, a first dielectric substrate, a first feed branch, a second feed branch, a metal member and a dielectric ring adapted to the metal member, the metal part is arranged in the dielectric ring, the first metal frame is provided with a first groove adapted to thedielectric ring, The dielectric ring is arranged in the first groove, the first feeding branch is arranged corresponding to the second feeding branch, and one end of the first feeding branch is arranged at an included angle of 90 DEG with respect to one end of the second feeding branch, and the other end of the first feeding branch is arranged in parallel with the other end of the second feedingbranch. The millimeter wave dual polarization slot antenna array system is applicable to both full screen equipment and equipment with a metal rear case or metal frame.
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double polarization millimeter wave antenna system and Mobile Terminal suitable for 5g communication
2018Co-Authors: Wu Shengjie, Zhao AnpingAbstract:The utility model discloses a double polarization millimeter wave antenna system and Mobile Terminal suitable for 5G communication, antenna system include the antenna element that six at least interval set up, antenna element is including the radiation main part and guide the structure into, the radiation main part includes first dielectric layer, primary radiation portion, first feed branch, second feed branch, third feed branch and fourth feed branch, it includes second dielectric layer, the first portion of guiding into and the second portion of guiding into to guide the structure into. Guide the structure into and need not to carry out the feed, simplified antenna system, be favorable to reduce cost, guide into the structure can to the radiation main part + 45 draws 45 two not the samecontributions of co -polar pattern production realize that the wide angle covers and the directional diagram uniformity of two kinds of polarization of antenna system is good, the utility model discloses an antenna system area occupied is little, need not set up the headroom, and antenna system can set up on a complete metal grounding plate, is applicable to full surface screen equipment.
Risto Valkonen - One of the best experts on this subject based on the ideXlab platform.
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eight element antenna array for diversity and mimo Mobile Terminal in lte 3500 mhz band
Microwave and Optical Technology Letters, 2014Co-Authors: Azremi Abdullah Alhadi, Risto Valkonen, Janne Ilvonen, Ville ViikariAbstract:A multiantenna system comprising of an eight-element antenna array in Mobile Terminal is presented. In this work, two sets of eight-element antenna structures based on capacitive coupling element and inverted-F antennas operating at 3400–3600 MHz long-term evolution frequency band are designed. The structures are estimated to achieve a good effective diversity gain in both uniform and nonuniform environments. It is also shown that the proposed structures achieve an ergodic multiple-input multiple-output (MIMO) capacity of only 1.2 bit/(s Hz) lower than the capacity achieved by ideal uncorrelated antennas. A prototype is fabricated to validate the simulation results. The result shows that the structure exhibited the highest mutual coupling of −10 dB across the required frequency band. Therefore, the proposed structure is a good candidate for implementing diversity and MIMO in Mobile Terminals. © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:1323–1327, 2014
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effect of ground plane bending on Mobile Terminal antenna performance
European Conference on Antennas and Propagation, 2013Co-Authors: Kimmo Rasilainen, Jari Holopainen, Risto Valkonen, Janne Ilvonen, Antti V. RäisänenAbstract:The performance of Mobile Terminal antennas in the case of a non-planar ground plane is studied. The effects of bending are analysed using computer simulations and a resonator-based equivalent circuit model for improving the understanding of the phenomenon. Results show that bending the ground plane can have a considerable effect on the operation and performance of the antenna. Resistive and reactive changes caused by the bending are accurately modelled with the equivalent circuit, and they can also be used to interpret changes in the quality factor.
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inherently non resonant multi band Mobile Terminal antenna
Electronics Letters, 2013Co-Authors: Risto Valkonen, Janne Ilvonen, Clemens Icheln, Pertti VainikainenAbstract:An inherently non-resonant capacitive coupling element antenna for Mobile handsets is presented. The compact antenna includes a simple coupling element with a novel multi-band matching circuit for simultaneous 698-960 and 1710-2690 MHz operation. Experimental results show that the antenna performs strongly in comparison to the current state-of-the-art in Mobile Terminal antennas, and that the non-resonant antenna is a competitive choice for Mobile Terminals.
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Mobile Terminal antenna performance with the user s hand effect of antenna dimensioning and location
IEEE Antennas and Wireless Propagation Letters, 2011Co-Authors: Janne Ilvonen, Jari Holopainen, Olli Kivekäs, Risto Valkonen, Kimmo Rasilainen, Pertti VainikainenAbstract:This letter reports a systematic simulation study of the performance of Mobile Terminal antennas in the vicinity of the user's hand. The effects of antenna dimensioning and antenna location on the ground plane of the device are demonstrated. The studied performance parameters are quality factor, radiation efficiency, and frequency detuning. Based on the results, beneficial approaches and general guidelines for antenna designs with a reduced effect of the user's hand can be given. For instance, it is shown that the radiation efficiency with the user's hand stays nearly constant (variation <;0.2 dB) despite the changes in the antenna element height (2-6.6 mm at 900 and 2000 MHz).
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broadband equivalent circuit model for capacitive coupling element based Mobile Terminal antenna
IEEE Antennas and Wireless Propagation Letters, 2010Co-Authors: Jari Holopainen, Olli Kivekäs, Risto Valkonen, Janne Ilvonen, Pertti VainikainenAbstract:In this letter, it is shown how the behavior of a capacitive coupling element (CCE)-based Mobile Terminal antenna can be modeled at the UHF band as a combination of the separate wavemodes of the structure. The proposed equivalent circuit model improves the general understanding of the operation of the antenna structure. It can be used for analyzing the combined performance of the capacitive coupling element and Terminal chassis, but it also helps in analyzing how different parts of the antenna structure contribute to the impedance and radiation.
Janne Ilvonen - One of the best experts on this subject based on the ideXlab platform.
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eight element antenna array for diversity and mimo Mobile Terminal in lte 3500 mhz band
Microwave and Optical Technology Letters, 2014Co-Authors: Azremi Abdullah Alhadi, Risto Valkonen, Janne Ilvonen, Ville ViikariAbstract:A multiantenna system comprising of an eight-element antenna array in Mobile Terminal is presented. In this work, two sets of eight-element antenna structures based on capacitive coupling element and inverted-F antennas operating at 3400–3600 MHz long-term evolution frequency band are designed. The structures are estimated to achieve a good effective diversity gain in both uniform and nonuniform environments. It is also shown that the proposed structures achieve an ergodic multiple-input multiple-output (MIMO) capacity of only 1.2 bit/(s Hz) lower than the capacity achieved by ideal uncorrelated antennas. A prototype is fabricated to validate the simulation results. The result shows that the structure exhibited the highest mutual coupling of −10 dB across the required frequency band. Therefore, the proposed structure is a good candidate for implementing diversity and MIMO in Mobile Terminals. © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:1323–1327, 2014
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effect of ground plane bending on Mobile Terminal antenna performance
European Conference on Antennas and Propagation, 2013Co-Authors: Kimmo Rasilainen, Jari Holopainen, Risto Valkonen, Janne Ilvonen, Antti V. RäisänenAbstract:The performance of Mobile Terminal antennas in the case of a non-planar ground plane is studied. The effects of bending are analysed using computer simulations and a resonator-based equivalent circuit model for improving the understanding of the phenomenon. Results show that bending the ground plane can have a considerable effect on the operation and performance of the antenna. Resistive and reactive changes caused by the bending are accurately modelled with the equivalent circuit, and they can also be used to interpret changes in the quality factor.
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inherently non resonant multi band Mobile Terminal antenna
Electronics Letters, 2013Co-Authors: Risto Valkonen, Janne Ilvonen, Clemens Icheln, Pertti VainikainenAbstract:An inherently non-resonant capacitive coupling element antenna for Mobile handsets is presented. The compact antenna includes a simple coupling element with a novel multi-band matching circuit for simultaneous 698-960 and 1710-2690 MHz operation. Experimental results show that the antenna performs strongly in comparison to the current state-of-the-art in Mobile Terminal antennas, and that the non-resonant antenna is a competitive choice for Mobile Terminals.
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Mobile Terminal antenna performance with the user s hand effect of antenna dimensioning and location
IEEE Antennas and Wireless Propagation Letters, 2011Co-Authors: Janne Ilvonen, Jari Holopainen, Olli Kivekäs, Risto Valkonen, Kimmo Rasilainen, Pertti VainikainenAbstract:This letter reports a systematic simulation study of the performance of Mobile Terminal antennas in the vicinity of the user's hand. The effects of antenna dimensioning and antenna location on the ground plane of the device are demonstrated. The studied performance parameters are quality factor, radiation efficiency, and frequency detuning. Based on the results, beneficial approaches and general guidelines for antenna designs with a reduced effect of the user's hand can be given. For instance, it is shown that the radiation efficiency with the user's hand stays nearly constant (variation <;0.2 dB) despite the changes in the antenna element height (2-6.6 mm at 900 and 2000 MHz).
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broadband equivalent circuit model for capacitive coupling element based Mobile Terminal antenna
IEEE Antennas and Wireless Propagation Letters, 2010Co-Authors: Jari Holopainen, Olli Kivekäs, Risto Valkonen, Janne Ilvonen, Pertti VainikainenAbstract:In this letter, it is shown how the behavior of a capacitive coupling element (CCE)-based Mobile Terminal antenna can be modeled at the UHF band as a combination of the separate wavemodes of the structure. The proposed equivalent circuit model improves the general understanding of the operation of the antenna structure. It can be used for analyzing the combined performance of the capacitive coupling element and Terminal chassis, but it also helps in analyzing how different parts of the antenna structure contribute to the impedance and radiation.
