Pub Date : 2015-08-01DOI: 10.1109/RFIT.2015.7377937
Kyohei Yamada, N. Sakai, T. Ohira
To design high efficiency WPT systems, we formulate the insertion loss in an L-shaped lumped-constant two-element matching circuit in terms of the elements' quality factors and the input/output impedances which are complex impedances rather than mere resistances. The derived formula is explicit, and thus enables analytical design of high-efficiency matching circuits with a clear perspective. Some analysis examples by the formula are also given, which reveal interesting facts.
{"title":"Power loss formula for impedance matching circuits dedicated to wireless power transfer","authors":"Kyohei Yamada, N. Sakai, T. Ohira","doi":"10.1109/RFIT.2015.7377937","DOIUrl":"https://doi.org/10.1109/RFIT.2015.7377937","url":null,"abstract":"To design high efficiency WPT systems, we formulate the insertion loss in an L-shaped lumped-constant two-element matching circuit in terms of the elements' quality factors and the input/output impedances which are complex impedances rather than mere resistances. The derived formula is explicit, and thus enables analytical design of high-efficiency matching circuits with a clear perspective. Some analysis examples by the formula are also given, which reveal interesting facts.","PeriodicalId":422369,"journal":{"name":"2015 IEEE International Symposium on Radio-Frequency Integration Technology (RFIT)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131881310","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-08-01DOI: 10.1109/RFIT.2015.7377923
M. Furuta, T. Itakura
This paper presents the design trends of high-resolution and high-speed Analog-to-Digital Converters (ADCs) which are employed in wireless LAN and ultra-wideband systems. The main research topic of such ADCs is reducing the power consumption. A number of reported low-power ADCs are classified into five types of ADCs. To understand the design challenges and the design techniques of low-power ADC, circuit configuration and basic operation of such five architectures are briefly reviewed. In addition, a guideline for architecture selection is discussed using a benchmark plot of recent developed ADCs. A future work of the ADC development also is discussed at the end of the paper.
{"title":"Trends in the design of high-speed, low-power analog-to-digital converters","authors":"M. Furuta, T. Itakura","doi":"10.1109/RFIT.2015.7377923","DOIUrl":"https://doi.org/10.1109/RFIT.2015.7377923","url":null,"abstract":"This paper presents the design trends of high-resolution and high-speed Analog-to-Digital Converters (ADCs) which are employed in wireless LAN and ultra-wideband systems. The main research topic of such ADCs is reducing the power consumption. A number of reported low-power ADCs are classified into five types of ADCs. To understand the design challenges and the design techniques of low-power ADC, circuit configuration and basic operation of such five architectures are briefly reviewed. In addition, a guideline for architecture selection is discussed using a benchmark plot of recent developed ADCs. A future work of the ADC development also is discussed at the end of the paper.","PeriodicalId":422369,"journal":{"name":"2015 IEEE International Symposium on Radio-Frequency Integration Technology (RFIT)","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132039701","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-08-01DOI: 10.1109/RFIT.2015.7377880
Yasunori Suzuki, K. Satoh, M. Sumi, A. Fukuda, S. Narahashi
This paper presents an integrated configuration of patch antennas and low-profile filters for a front-end module in a Massive-MIMO transmitter on 5G era. It is very important for the Massive-MIMO transmitter to build thin and light-weight equipment from the viewpoint of easy installation. However, in general, conventional filters used in base station transmitters are large and heavy-weight, which prevents the Massive-MIMO transmitter from achieving its compact-sized configuration. This paper employs a substrate integrated waveguide (SIW) filter which can provide thin structure combined with antennas using the same substrate material. This paper evaluates the proposed configuration by computer simulation including SIW filters and patch antennas in order to reveal the directivity degradation by the SIW filters. There is almost no degradation with regard to the directivity of the proposed configuration as an array antenna. These investigation results show a key-way to configure the Massive-MIMO transmitter that can offer advantages in low-profile and light-weight.
{"title":"An integrated configuration of antennas and filters for front-end module in massive-MIMO transmitter","authors":"Yasunori Suzuki, K. Satoh, M. Sumi, A. Fukuda, S. Narahashi","doi":"10.1109/RFIT.2015.7377880","DOIUrl":"https://doi.org/10.1109/RFIT.2015.7377880","url":null,"abstract":"This paper presents an integrated configuration of patch antennas and low-profile filters for a front-end module in a Massive-MIMO transmitter on 5G era. It is very important for the Massive-MIMO transmitter to build thin and light-weight equipment from the viewpoint of easy installation. However, in general, conventional filters used in base station transmitters are large and heavy-weight, which prevents the Massive-MIMO transmitter from achieving its compact-sized configuration. This paper employs a substrate integrated waveguide (SIW) filter which can provide thin structure combined with antennas using the same substrate material. This paper evaluates the proposed configuration by computer simulation including SIW filters and patch antennas in order to reveal the directivity degradation by the SIW filters. There is almost no degradation with regard to the directivity of the proposed configuration as an array antenna. These investigation results show a key-way to configure the Massive-MIMO transmitter that can offer advantages in low-profile and light-weight.","PeriodicalId":422369,"journal":{"name":"2015 IEEE International Symposium on Radio-Frequency Integration Technology (RFIT)","volume":"199 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132229297","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-08-01DOI: 10.1109/RFIT.2015.7377938
T. Hamasaki
This paper shows the some technical subjects of the ad hoc portable wireless sensor network while concentrating on it about the energy consumption of the integrated module system. In order to increase the battery life of sensor nodes, minimizing transmission power of wireless link is required, which is the significant part of node total energy consumption. However, this results in degradation of communication reliability. Firstly, this paper demonstrates requirements of ad hoc networking. Secondly, based on an experimental result using a low power 2.4GHz wireless sensor integrated modules with tiny pattern antenna, propagation of the radio wave is discussed in order to provide fundamental aspects of wireless communication reliability for various node settings.
{"title":"Study of reliable networking for short-range autonomous sensor node","authors":"T. Hamasaki","doi":"10.1109/RFIT.2015.7377938","DOIUrl":"https://doi.org/10.1109/RFIT.2015.7377938","url":null,"abstract":"This paper shows the some technical subjects of the ad hoc portable wireless sensor network while concentrating on it about the energy consumption of the integrated module system. In order to increase the battery life of sensor nodes, minimizing transmission power of wireless link is required, which is the significant part of node total energy consumption. However, this results in degradation of communication reliability. Firstly, this paper demonstrates requirements of ad hoc networking. Secondly, based on an experimental result using a low power 2.4GHz wireless sensor integrated modules with tiny pattern antenna, propagation of the radio wave is discussed in order to provide fundamental aspects of wireless communication reliability for various node settings.","PeriodicalId":422369,"journal":{"name":"2015 IEEE International Symposium on Radio-Frequency Integration Technology (RFIT)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128645110","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-08-01DOI: 10.1109/RFIT.2015.7377887
Y. Kanamori
Two kinds of metamaterial filters were described. First, electromagnetically induced transparency (EIT) metamaterials having EIT-like effects were experimentally demonstrated in terahertz frequency region, and their transmittance characteristics were evaluated. An EIT metamaterial consisted of a dipole resonator and a quadrupole resonator and had a gap between two resonators. At frequencies around 1.5 THz, EIT-like effects with transmittance of 82.0% were observed for EIT metamaterials with the gap distance of 3.1 μm. Second, metamaterial absorbers with various sizes were fabricated and the absorption property was measured in terahertz frequency region. 90% of absorption was experimentally obtained at 1.5 THz.
{"title":"Wavelength selective filters using metamaterials in terahertz frequency region","authors":"Y. Kanamori","doi":"10.1109/RFIT.2015.7377887","DOIUrl":"https://doi.org/10.1109/RFIT.2015.7377887","url":null,"abstract":"Two kinds of metamaterial filters were described. First, electromagnetically induced transparency (EIT) metamaterials having EIT-like effects were experimentally demonstrated in terahertz frequency region, and their transmittance characteristics were evaluated. An EIT metamaterial consisted of a dipole resonator and a quadrupole resonator and had a gap between two resonators. At frequencies around 1.5 THz, EIT-like effects with transmittance of 82.0% were observed for EIT metamaterials with the gap distance of 3.1 μm. Second, metamaterial absorbers with various sizes were fabricated and the absorption property was measured in terahertz frequency region. 90% of absorption was experimentally obtained at 1.5 THz.","PeriodicalId":422369,"journal":{"name":"2015 IEEE International Symposium on Radio-Frequency Integration Technology (RFIT)","volume":"87 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133830567","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-08-01DOI: 10.1109/RFIT.2015.7377873
Tian-Wei Huang
This paper reviews recent digitally calibration and IQ mismatch compensation techniques. A number of approaches have been reported to improve the circuit performance and enhance the system robustness. All these built-in self-calibration and auto-switching functions are innovated to pave the road to the next-generation millimeter-wave 5G mobile smart RFIC.
{"title":"Smart RFIC: Millimeter-wave gigabit transceivers with digitally-enabled built-in self-calibration and auto-switching functions: From single-ended ILFD toward differential miller frequency divider","authors":"Tian-Wei Huang","doi":"10.1109/RFIT.2015.7377873","DOIUrl":"https://doi.org/10.1109/RFIT.2015.7377873","url":null,"abstract":"This paper reviews recent digitally calibration and IQ mismatch compensation techniques. A number of approaches have been reported to improve the circuit performance and enhance the system robustness. All these built-in self-calibration and auto-switching functions are innovated to pave the road to the next-generation millimeter-wave 5G mobile smart RFIC.","PeriodicalId":422369,"journal":{"name":"2015 IEEE International Symposium on Radio-Frequency Integration Technology (RFIT)","volume":"221 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130527706","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-08-01DOI: 10.1109/RFIT.2015.7377869
M. Nagata, N. Miura, S. Muroga, Satoshi Tanaka, M. Yamaguchi
In-band interferers due to noise coupling from baseband digital circuits significantly impact on the wireless communication performance, in the case of single-chip system-level integration. The on-chip and off-chip (on-board) noise coupling are measured for visualizing the noise couplings. In addition, the hardware-in-the-loop simulation (HILS) estimates their impacts on the performance metrics like throughputs, under the interactions of interferers with the operation of LTE-compliant RF receiver circuits in a 65 nm CMOS technology.
{"title":"On-chip and on-board RF noise coupling and impacts on LTE wireless communication performance (Invited)","authors":"M. Nagata, N. Miura, S. Muroga, Satoshi Tanaka, M. Yamaguchi","doi":"10.1109/RFIT.2015.7377869","DOIUrl":"https://doi.org/10.1109/RFIT.2015.7377869","url":null,"abstract":"In-band interferers due to noise coupling from baseband digital circuits significantly impact on the wireless communication performance, in the case of single-chip system-level integration. The on-chip and off-chip (on-board) noise coupling are measured for visualizing the noise couplings. In addition, the hardware-in-the-loop simulation (HILS) estimates their impacts on the performance metrics like throughputs, under the interactions of interferers with the operation of LTE-compliant RF receiver circuits in a 65 nm CMOS technology.","PeriodicalId":422369,"journal":{"name":"2015 IEEE International Symposium on Radio-Frequency Integration Technology (RFIT)","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125090774","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-08-01DOI: 10.1109/RFIT.2015.7377885
S. Hara, I. Watanabe, N. Sekine, A. Kasamatsu, K. Katayama, K. Yoshida, S. Amakawa, M. Fujishima
This paper presents a wideband differential amplifier operating at 138 GHz in 40-nm CMOS. It is composed of five differential common source stages with cross-coupled capacitors. A small-signal gain of 18 dB at 138 GHz and a 3-dB bandwidth of 27 GHz are achieved. It consumes 75 mW from a 0.94-V voltage supply. The die area with balun and pads is 945 × 842 μm2 and the core size not including input/output matching networks is 201 × 284 μm2. The small core area is realized by using a refined "fishbone" layout technique.
{"title":"Compact 138-GHz amplifier with 18-dB peak gain and 27-GHz 3-dB bandwidth","authors":"S. Hara, I. Watanabe, N. Sekine, A. Kasamatsu, K. Katayama, K. Yoshida, S. Amakawa, M. Fujishima","doi":"10.1109/RFIT.2015.7377885","DOIUrl":"https://doi.org/10.1109/RFIT.2015.7377885","url":null,"abstract":"This paper presents a wideband differential amplifier operating at 138 GHz in 40-nm CMOS. It is composed of five differential common source stages with cross-coupled capacitors. A small-signal gain of 18 dB at 138 GHz and a 3-dB bandwidth of 27 GHz are achieved. It consumes 75 mW from a 0.94-V voltage supply. The die area with balun and pads is 945 × 842 μm2 and the core size not including input/output matching networks is 201 × 284 μm2. The small core area is realized by using a refined \"fishbone\" layout technique.","PeriodicalId":422369,"journal":{"name":"2015 IEEE International Symposium on Radio-Frequency Integration Technology (RFIT)","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127552021","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-08-01DOI: 10.1109/RFIT.2015.7377899
K. K. Tokgoz, S. Maki, K. Okada, A. Matsuzawa
Cross-line, a four-port device, used for capacitive cross coupling in differential millimeter-wave amplifiers is modeled and characterized up to 110 GHz using two-port vector network analyzer measurement results. This passive component is electrically symmetrical to be used in differential amplifiers for decreased amplitude and phase mismatch. Two characterization structures are used for the method to be applied. The results are compared with four-port measurements up to 67 GHz. The comparisons show good agreement between the two methods.
{"title":"Characterization of cross-line up to 110 GHz using two-port measurements","authors":"K. K. Tokgoz, S. Maki, K. Okada, A. Matsuzawa","doi":"10.1109/RFIT.2015.7377899","DOIUrl":"https://doi.org/10.1109/RFIT.2015.7377899","url":null,"abstract":"Cross-line, a four-port device, used for capacitive cross coupling in differential millimeter-wave amplifiers is modeled and characterized up to 110 GHz using two-port vector network analyzer measurement results. This passive component is electrically symmetrical to be used in differential amplifiers for decreased amplitude and phase mismatch. Two characterization structures are used for the method to be applied. The results are compared with four-port measurements up to 67 GHz. The comparisons show good agreement between the two methods.","PeriodicalId":422369,"journal":{"name":"2015 IEEE International Symposium on Radio-Frequency Integration Technology (RFIT)","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115295795","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-08-01DOI: 10.1109/RFIT.2015.7377934
A. Fukuda, H. Okazaki, S. Narahashi
This paper proposes a novel configuration for a phased array antenna system (PAS) that achieves ultra-broadband transmission using millimeter waves. Since it is expected to employ an unprecedented number of antennas, the PAS is required to be compact and cost effective. Generally, the PAS employs phase shifters that are applied to the IF or RF transmission signal lines for beam forming. However, the phase shifter limits the bandwidth of the transmission signal due to the required accuracy of the phase adjustment. A PAS employing phase-controlled RF carriers is a promising configuration for broadband transmission. In the proposed configuration, RF carriers are generated by frequency upconverting the phase-controlled local signals with a lower frequency. To confirm the feasibility of the proposed configuration, a two-branch PAS transmitter with phase-controlled RF carriers is configured and tested. Measurement results show that the phase-controlled local signals that have a frequency lower than that of the RF carriers can be used to control the phase difference between the transmitted RF signals.
{"title":"A phased array antenna system employing frequency-upconverted local signals with phase difference","authors":"A. Fukuda, H. Okazaki, S. Narahashi","doi":"10.1109/RFIT.2015.7377934","DOIUrl":"https://doi.org/10.1109/RFIT.2015.7377934","url":null,"abstract":"This paper proposes a novel configuration for a phased array antenna system (PAS) that achieves ultra-broadband transmission using millimeter waves. Since it is expected to employ an unprecedented number of antennas, the PAS is required to be compact and cost effective. Generally, the PAS employs phase shifters that are applied to the IF or RF transmission signal lines for beam forming. However, the phase shifter limits the bandwidth of the transmission signal due to the required accuracy of the phase adjustment. A PAS employing phase-controlled RF carriers is a promising configuration for broadband transmission. In the proposed configuration, RF carriers are generated by frequency upconverting the phase-controlled local signals with a lower frequency. To confirm the feasibility of the proposed configuration, a two-branch PAS transmitter with phase-controlled RF carriers is configured and tested. Measurement results show that the phase-controlled local signals that have a frequency lower than that of the RF carriers can be used to control the phase difference between the transmitted RF signals.","PeriodicalId":422369,"journal":{"name":"2015 IEEE International Symposium on Radio-Frequency Integration Technology (RFIT)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115695759","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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