The Experts below are selected from a list of 261 Experts worldwide ranked by ideXlab platform
Shoji Tanaka - One of the best experts on this subject based on the ideXlab platform.
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performance evaluation of transmission system for 8k super hi vision Satellite Broadcasting
Global Communications Conference, 2014Co-Authors: Yoichi Suzuki, Shoji Tanaka, K Tsuchida, Y Matsusaki, T Ikeda, Akinori Hashimoto, N OkumuraAbstract:We developed a new transmission system for 8K Super Hi-Vision Satellite Broadcasting in Japan. This system has a transmission capacity of over 100 Mbps in a single 34.5MHz Satellite transponder. The key technical feature of the new system are lowering roll-off factor to 0.03 and using 16APSK and LDPC code with a coding rate of 7/9. To confirm the transmission performance in a Satellite channel, we conducted indoor transmission tests and transmission tests using Japanese communication and Broadcasting Satellites. This paper shows the transmission performance of this system and similar performance was obtained in indoor-transmission and Satellite-transmission tests.
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configuration of array fed imaging reflector antenna for 21 ghz band Broadcasting Satellite
IEEE International Symposium on Phased Array Systems and Technology, 2013Co-Authors: Susumu Nakazawa, Masafumi Nagasaka, Shoji Tanaka, Masashi Kamei, Y ItoAbstract:NHK is developing Super Hi-Vision, a form of ultra-high-definition TV. In order to transmit multiple SHV programs and other advanced forms of Broadcasting, Satellite Broadcasting in the 21-GHz band is expected. We have proposed an array-fed reflector antenna as part of a wide band and high power transponder combining outputs of the each element through high power amplifiers that are close to the elements. The proposed antenna is reconfigurable in order to exploit the Satellite's limited resources, and it has the ability to control its radiation pattern as a way of mitigating fading. To confirm the feasibility of this reconfigurable antenna system in the space environment, we are in the process of fabricating an engineering model of an array-fed imaging reflector antenna. In this report, we describe the design and fabrication of the phase shifter and attenuator MMIC for the engineering model. Furthermore, we explore the possibility of the Broadcasting Satellite system by presenting an example layout for the Satellite onboard system.
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A method to estimate outage for 21-GHz band Satellite Broadcasting system
2013 International Symposium on Electromagnetic Theory, 2013Co-Authors: Susumu Nakazawa, Masafumi Nagasaka, Shoji TanakaAbstract:Satellite Broadcasting in the 21-GHz band is expected to transmit large-capacity signals. However, this band suffers from severe fading due to rain and so on. In this regards, we have proposed a reconfigurable antenna system to exploit the limited resources because of its ability to control radiation pattern for fading mitigation. We proposed a method to control the radiation pattern and to estimate outage due to rain using radar/raingauge-analyzed precipitation. Also we have measured the rain attenuation in the 12-GHz band in Tokyo. This paper describes a simulation of outage for Satellite Broadcasting configuring dynamic controlled radiation pattern by the reconfigurable antenna. Then we compared outage estimated using radar/raingauge-analyzed precipitation and outage evaluated using time series of the measured rain attenuation scaled to 21-GHz band.
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designing an engineering model of reconfigurable antenna for 21 ghz band Broadcasting Satellite
European Conference on Antennas and Propagation, 2013Co-Authors: Susumu Nakazawa, Masafumi Nagasaka, Shoji Tanaka, Masashi Kamei, Y ItoAbstract:NHK is developing Super Hi-Vision as ultra high definition TV. In order to transmit rich SHV contents, Satellite Broadcasting in the 21-GHz band is expected. We have proposed an array-fed reflector antenna in order to realize wide band and high power transponder combining outputs of each element closely connected high power amplifiers. The proposed antenna is also reconfigurable to exploit the limited resources because of its ability to control radiation pattern for fading mitigation. We have proposed and studied of the reconfigurable antenna system by computing radiation patterns assuming various antenna configurations and measured radiation patterns formed by an experimental array-fed imaging reflector antenna. In order to confirm the feasibility of the proposed reconfigurable antenna system in the space environment, we are on the way to fabricate an engineering model of an array-fed imaging reflector antenna. In this report, we introduced designed configuration and requirement for the engineering model of 21-GHz Broadcasting Satellite.
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engineering model of a 300 mhz class wideband transponder for the 21ghz band Broadcasting Satellite
30th AIAA International Communications Satellite System Conference (ICSSC), 2012Co-Authors: Masashi Kamei, Susumu Nakazawa, Masafumi Nagasaka, Shoji TanakaAbstract:The Satellite Broadcasting in the band 21.4 - 22.0 GHz is expected to provide advanced Broadcasting services such as UHDTV and 3DTV, etc. NHK STRL is developing Super Hi-Vision, which has 33 megapixels (7,680 × 4,320 pixels) and 22.2 multichannel sound, as well as 21GHz-band Satellite Broadcasting system to implement Super HiVision. We have developed an engineering model of a 300-MHz class wideband transponder in the band 21.4 - 21.7 GHz. The transponder consists of a diplexer, a branching filter, a receiver, an input filter, a traveling wave tube equipped with a linearizer and channel amplifier, an output filter and a multiplexer. Thermal vacuum test demonstrated that the modeled transponder has stable electrical performance over a wide temperature range.
Susumu Nakazawa - One of the best experts on this subject based on the ideXlab platform.
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configuration of array fed imaging reflector antenna for 21 ghz band Broadcasting Satellite
IEEE International Symposium on Phased Array Systems and Technology, 2013Co-Authors: Susumu Nakazawa, Masafumi Nagasaka, Shoji Tanaka, Masashi Kamei, Y ItoAbstract:NHK is developing Super Hi-Vision, a form of ultra-high-definition TV. In order to transmit multiple SHV programs and other advanced forms of Broadcasting, Satellite Broadcasting in the 21-GHz band is expected. We have proposed an array-fed reflector antenna as part of a wide band and high power transponder combining outputs of the each element through high power amplifiers that are close to the elements. The proposed antenna is reconfigurable in order to exploit the Satellite's limited resources, and it has the ability to control its radiation pattern as a way of mitigating fading. To confirm the feasibility of this reconfigurable antenna system in the space environment, we are in the process of fabricating an engineering model of an array-fed imaging reflector antenna. In this report, we describe the design and fabrication of the phase shifter and attenuator MMIC for the engineering model. Furthermore, we explore the possibility of the Broadcasting Satellite system by presenting an example layout for the Satellite onboard system.
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A method to estimate outage for 21-GHz band Satellite Broadcasting system
2013 International Symposium on Electromagnetic Theory, 2013Co-Authors: Susumu Nakazawa, Masafumi Nagasaka, Shoji TanakaAbstract:Satellite Broadcasting in the 21-GHz band is expected to transmit large-capacity signals. However, this band suffers from severe fading due to rain and so on. In this regards, we have proposed a reconfigurable antenna system to exploit the limited resources because of its ability to control radiation pattern for fading mitigation. We proposed a method to control the radiation pattern and to estimate outage due to rain using radar/raingauge-analyzed precipitation. Also we have measured the rain attenuation in the 12-GHz band in Tokyo. This paper describes a simulation of outage for Satellite Broadcasting configuring dynamic controlled radiation pattern by the reconfigurable antenna. Then we compared outage estimated using radar/raingauge-analyzed precipitation and outage evaluated using time series of the measured rain attenuation scaled to 21-GHz band.
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designing an engineering model of reconfigurable antenna for 21 ghz band Broadcasting Satellite
European Conference on Antennas and Propagation, 2013Co-Authors: Susumu Nakazawa, Masafumi Nagasaka, Shoji Tanaka, Masashi Kamei, Y ItoAbstract:NHK is developing Super Hi-Vision as ultra high definition TV. In order to transmit rich SHV contents, Satellite Broadcasting in the 21-GHz band is expected. We have proposed an array-fed reflector antenna in order to realize wide band and high power transponder combining outputs of each element closely connected high power amplifiers. The proposed antenna is also reconfigurable to exploit the limited resources because of its ability to control radiation pattern for fading mitigation. We have proposed and studied of the reconfigurable antenna system by computing radiation patterns assuming various antenna configurations and measured radiation patterns formed by an experimental array-fed imaging reflector antenna. In order to confirm the feasibility of the proposed reconfigurable antenna system in the space environment, we are on the way to fabricate an engineering model of an array-fed imaging reflector antenna. In this report, we introduced designed configuration and requirement for the engineering model of 21-GHz Broadcasting Satellite.
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engineering model of a 300 mhz class wideband transponder for the 21ghz band Broadcasting Satellite
30th AIAA International Communications Satellite System Conference (ICSSC), 2012Co-Authors: Masashi Kamei, Susumu Nakazawa, Masafumi Nagasaka, Shoji TanakaAbstract:The Satellite Broadcasting in the band 21.4 - 22.0 GHz is expected to provide advanced Broadcasting services such as UHDTV and 3DTV, etc. NHK STRL is developing Super Hi-Vision, which has 33 megapixels (7,680 × 4,320 pixels) and 22.2 multichannel sound, as well as 21GHz-band Satellite Broadcasting system to implement Super HiVision. We have developed an engineering model of a 300-MHz class wideband transponder in the band 21.4 - 21.7 GHz. The transponder consists of a diplexer, a branching filter, a receiver, an input filter, a traveling wave tube equipped with a linearizer and channel amplifier, an output filter and a multiplexer. Thermal vacuum test demonstrated that the modeled transponder has stable electrical performance over a wide temperature range.
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experimental model of array fed imaging reflector antenna for 21ghz band Satellite Broadcasting system
29th AIAA International Communications Satellite Systems Conference (ICSSC-2011), 2011Co-Authors: Masafumi Nagasaka, Susumu Nakazawa, Shoji Tanaka, Kazuyoshi ShogenAbstract:Satellite Broadcasting in the 21GHz-band is expected to transmit large-capacity signals such as ultra high definition TV, called Super Hi-Vision in Japan with more than 4000 scanning lines. However, the 21GHz-band suffers from severe fading due to rain. In order to overcome the large rain attenuation, a reconfigurable antenna with an array-fed reflector is effective for the 21GHz-band Satellite system. Therefore, we designed and manufactured an experimental model of an array-fed imaging reflector antenna for the 21GHz-band Broadcasting Satellite system. We verified the characteristics by measurement. We describe the configuration of the manufactured antenna and the radiation pattern of the imaging reflector calculated by using the measured radiation pattern of the feed array. A 7dB boosted beam has been successfully obtained.
Kazuyoshi Shogen - One of the best experts on this subject based on the ideXlab platform.
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experimental model of array fed imaging reflector antenna for 21ghz band Satellite Broadcasting system
29th AIAA International Communications Satellite Systems Conference (ICSSC-2011), 2011Co-Authors: Masafumi Nagasaka, Susumu Nakazawa, Shoji Tanaka, Kazuyoshi ShogenAbstract:Satellite Broadcasting in the 21GHz-band is expected to transmit large-capacity signals such as ultra high definition TV, called Super Hi-Vision in Japan with more than 4000 scanning lines. However, the 21GHz-band suffers from severe fading due to rain. In order to overcome the large rain attenuation, a reconfigurable antenna with an array-fed reflector is effective for the 21GHz-band Satellite system. Therefore, we designed and manufactured an experimental model of an array-fed imaging reflector antenna for the 21GHz-band Broadcasting Satellite system. We verified the characteristics by measurement. We describe the configuration of the manufactured antenna and the radiation pattern of the imaging reflector calculated by using the measured radiation pattern of the feed array. A 7dB boosted beam has been successfully obtained.
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simulation of outage for 21 ghz band Satellite Broadcasting system using frequency scaling of measured rain attenuation
European Conference on Antennas and Propagation, 2011Co-Authors: Susumu Nakazawa, Masafumi Nagasaka, Shoji Tanaka, Yoichi Suzuki, Kazuyoshi ShogenAbstract:Satellite Broadcasting in the 21-GHz band is expected to transmit large-capacity signals. However, this band suffers from severe fading due to rain and so on. In this regards, we have proposed a reconfigurable antenna system to exploit the limited resources because of its ability to control radiation pattern for fading mitigation. We have measured the rain attenuation in the 12-Ghz band in Tokyo. This paper describes a simulation of outage for Satellite Broadcasting configuring dynamic controlled radiation pattern by reconfigurable antenna using the measured rain attenuation scaled up to 21-GHz band.
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a method to control phased array antenna for rain fading mitigation of 21 ghz band Broadcasting Satellite
European Conference on Antennas and Propagation, 2010Co-Authors: Susumu Nakazawa, Masafumi Nagasaka, Shoji Tanaka, Kazuyoshi ShogenAbstract:Satellite Broadcasting in the 21-GHz band is expected to transmit large-capacity signals. We have been studying rain fading mitigation techniques in order to compensate large amount of rain attenuation. In this paper, we show a method to control the radiation pattern dynamically in accordance with the movement of the rain area assuming array-fed reflector antenna using 61 horns and a reflector with the aperture diameter of 2.2m. Then we compared the number of the outage areas using dynamically controlled radiation pattern formed by the array-fed reflector antenna with that using static radiation pattern formed by shaped reflector antenna while assuming the same input power to the antenna. According to the simulation during 7days, the accumulated number of outage points using dynamic radiation pattern was reduced to less than 50% compared to that using static radiation pattern.
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design of ldpc codes for the advanced Satellite Broadcasting system
The Journal of The Institute of Image Information and Television Engineers, 2008Co-Authors: Yoichi Suzuki, Shoji Tanaka, Akinori Hashimoto, Masaaki Kojima, Hisashi Sujikai, Takeshi Kimura, Kazuyoshi Shogen, Takashi Yokokawa, Makiko KanAbstract:We have been studying an advanced Satellite Broadcasting system which is aimed at improving the Integrated Services Digital Broadcasting for Satellite (ISDB-S) system. By making use of LDPC codes and the reduced roll-off factor, this advanced system can increase its transmission channel capacity to 30% that of the ISDB-S one. Furthermore, by applying multi-level amplitude phase shift keying (M-APSK) modulation schemes, we can increase the transmission channel capacity. We report on LDPC codes that are designed for the transmission format of the advanced Satellite Broadcasting system. The computer simulation results of B/Q/8PSK performances under the AWGN channel model are also reported. We also discuss and report the optimization result gained from a computer simulation of the radius ratio of LDPC-coded 16APSK and 32APSK modulation, which is proposed in this advanced system, with respect to Bit Error Rate (BER) under the AWGN channel model.
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a method to transform rainfall rate to rain attenuation and its application to 21 ghz band Satellite Broadcasting
International Symposium on Antennas and Propagation, 2008Co-Authors: Susumu Nakazawa, Shoji Tanaka, Kazuyoshi ShogenAbstract:Satellite Broadcasting in the 21-GHz band is expected to transmit large-capacity signals such as ultrahigh-definition TV. However, this band suffers from large amounts of rain attenuation. In this regard, we have been studying rain fading mitigation techniques, in which the radiation power is increased locally in the area of heavy rainfall. To design such a Satellite Broadcasting system, it is necessary to evaluate service availability when using the locally increased beam technique. The rain attenuation data should be derived from the rainfall rate data. We developed a method to transform rainfall rate into rain attenuation in the 21 GHz band. Then, we performed a simulation that applied the method to the analysis of the service availability for an example phased array antenna configuration. The results confirmed the service availability increased with the locally increased beam technique.
Riccardo De Gaudenzi - One of the best experts on this subject based on the ideXlab platform.
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mimo for mobile Satellite digital Broadcasting from theory to practice
IEEE Transactions on Vehicular Technology, 2016Co-Authors: Aaron Byman, Pantelis-daniel Arapoglou, Massimo Bertinelli, Ari Hulkkonen, Riccardo De GaudenziAbstract:This paper presents the detailed design and the key system performance results of a comprehensive laboratory demonstrator (testbed) for a hybrid Satellite/terrestrial S-band mobile digital Broadcasting system. The physical layer is based on an enhanced version of the digital video Broadcasting—Satellite to handheld (DVB-SH) standard, exploiting dual-polarization multiple-input–multiple-output (MIMO) technology. This complete digital MIMO demonstrator, which is the first of its kind, allows for an in-depth verification and optimization of the MIMO techniques applied to Satellite Broadcasting networks. Moreover, this demonstrator allows for complementing and confirming the theoretical or simulation-based findings published thus far. It is shown that dual-polarization MIMO diversity is able to provide remarkable gains in terms of Satellite/terrestrial transmit power reduction and/or capacity increase compared with more conventional non-MIMO solutions. It is also demonstrated that the adoption of a relatively simple spatial multiplexing MIMO technique represents the best way to grasp these gains. This paper provides an extensive set of laboratory measurement results for existing stochastic Satellite and hybrid MIMO channels, as well as results based on an S-band Satellite-measured dual-polarization time series recently collected during a campaign sponsored by the European Space Agency. Results obtained using MIMO techniques are also compared with a dual- and single-polarization single-input–single-output (SISO) DVB-SH benchmark system and with computer simulation results.
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To MIMO or not to MIMO in mobile Satellite Broadcasting systems
IEEE Transactions on Wireless Communications, 2011Co-Authors: Pantelis-daniel Arapoglou, Paolo Burzigotti, Massimo Bertinelli, Ana Bolea-alamanac, Riccardo De GaudenziAbstract:This letter studies the potential capacity advantages of introducing a dual polarization per beam paradigm instead of the conventional single polarization per beam in mobile Satellite Broadcasting systems. This enables the application of MIMO techniques, not yet thoroughly investigated for mobile Satellite systems. We engage in a fair system performance comparison between single polarization SISO and dual polarization non-MIMO and MIMO configurations based on the DVB-SH state-of-the-art mobile Satellite standard. Along the course, the major advantages and pitfalls of a dual polarization per beam system from an interference, antenna, payload, and capacity perspective are highlighted.
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Capacity potential of mobile Satellite Broadcasting systems employing dual polarization per beam
ASMS SPSC 2010: 2010 5th Advanced Satellite Multimedia Systems Conference and the 11th Signal Processing for Space Communications Workshop, 2010Co-Authors: Pantelis-daniel Arapoglou, Paolo Burzigotti, Ana Bolea-alamanac, Riccardo De GaudenziAbstract:The paper carries out a preliminary assessment of how mobile Satellite Broadcasting (MSB) systems can increase their capacity potential with a high degree of flexibility and, at the same time, remain on par with wireless terrestrial counterparts. As argued in this work, a promising way forward in this regard is the migration from the conventional single polarization per beam to an advanced dual polarization per beam architecture, also benefitting from recent advancement in multibeam antenna techniques. This work summarizes results of recent studies on dual polarization MSB from a system, interference, antenna, channel, capacity, and FEC uncoded MIMO performance perspective, highlighting along the course the major milestones and challenges.
Masafumi Nagasaka - One of the best experts on this subject based on the ideXlab platform.
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configuration of array fed imaging reflector antenna for 21 ghz band Broadcasting Satellite
IEEE International Symposium on Phased Array Systems and Technology, 2013Co-Authors: Susumu Nakazawa, Masafumi Nagasaka, Shoji Tanaka, Masashi Kamei, Y ItoAbstract:NHK is developing Super Hi-Vision, a form of ultra-high-definition TV. In order to transmit multiple SHV programs and other advanced forms of Broadcasting, Satellite Broadcasting in the 21-GHz band is expected. We have proposed an array-fed reflector antenna as part of a wide band and high power transponder combining outputs of the each element through high power amplifiers that are close to the elements. The proposed antenna is reconfigurable in order to exploit the Satellite's limited resources, and it has the ability to control its radiation pattern as a way of mitigating fading. To confirm the feasibility of this reconfigurable antenna system in the space environment, we are in the process of fabricating an engineering model of an array-fed imaging reflector antenna. In this report, we describe the design and fabrication of the phase shifter and attenuator MMIC for the engineering model. Furthermore, we explore the possibility of the Broadcasting Satellite system by presenting an example layout for the Satellite onboard system.
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A method to estimate outage for 21-GHz band Satellite Broadcasting system
2013 International Symposium on Electromagnetic Theory, 2013Co-Authors: Susumu Nakazawa, Masafumi Nagasaka, Shoji TanakaAbstract:Satellite Broadcasting in the 21-GHz band is expected to transmit large-capacity signals. However, this band suffers from severe fading due to rain and so on. In this regards, we have proposed a reconfigurable antenna system to exploit the limited resources because of its ability to control radiation pattern for fading mitigation. We proposed a method to control the radiation pattern and to estimate outage due to rain using radar/raingauge-analyzed precipitation. Also we have measured the rain attenuation in the 12-GHz band in Tokyo. This paper describes a simulation of outage for Satellite Broadcasting configuring dynamic controlled radiation pattern by the reconfigurable antenna. Then we compared outage estimated using radar/raingauge-analyzed precipitation and outage evaluated using time series of the measured rain attenuation scaled to 21-GHz band.
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designing an engineering model of reconfigurable antenna for 21 ghz band Broadcasting Satellite
European Conference on Antennas and Propagation, 2013Co-Authors: Susumu Nakazawa, Masafumi Nagasaka, Shoji Tanaka, Masashi Kamei, Y ItoAbstract:NHK is developing Super Hi-Vision as ultra high definition TV. In order to transmit rich SHV contents, Satellite Broadcasting in the 21-GHz band is expected. We have proposed an array-fed reflector antenna in order to realize wide band and high power transponder combining outputs of each element closely connected high power amplifiers. The proposed antenna is also reconfigurable to exploit the limited resources because of its ability to control radiation pattern for fading mitigation. We have proposed and studied of the reconfigurable antenna system by computing radiation patterns assuming various antenna configurations and measured radiation patterns formed by an experimental array-fed imaging reflector antenna. In order to confirm the feasibility of the proposed reconfigurable antenna system in the space environment, we are on the way to fabricate an engineering model of an array-fed imaging reflector antenna. In this report, we introduced designed configuration and requirement for the engineering model of 21-GHz Broadcasting Satellite.
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engineering model of a 300 mhz class wideband transponder for the 21ghz band Broadcasting Satellite
30th AIAA International Communications Satellite System Conference (ICSSC), 2012Co-Authors: Masashi Kamei, Susumu Nakazawa, Masafumi Nagasaka, Shoji TanakaAbstract:The Satellite Broadcasting in the band 21.4 - 22.0 GHz is expected to provide advanced Broadcasting services such as UHDTV and 3DTV, etc. NHK STRL is developing Super Hi-Vision, which has 33 megapixels (7,680 × 4,320 pixels) and 22.2 multichannel sound, as well as 21GHz-band Satellite Broadcasting system to implement Super HiVision. We have developed an engineering model of a 300-MHz class wideband transponder in the band 21.4 - 21.7 GHz. The transponder consists of a diplexer, a branching filter, a receiver, an input filter, a traveling wave tube equipped with a linearizer and channel amplifier, an output filter and a multiplexer. Thermal vacuum test demonstrated that the modeled transponder has stable electrical performance over a wide temperature range.
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experimental model of array fed imaging reflector antenna for 21ghz band Satellite Broadcasting system
29th AIAA International Communications Satellite Systems Conference (ICSSC-2011), 2011Co-Authors: Masafumi Nagasaka, Susumu Nakazawa, Shoji Tanaka, Kazuyoshi ShogenAbstract:Satellite Broadcasting in the 21GHz-band is expected to transmit large-capacity signals such as ultra high definition TV, called Super Hi-Vision in Japan with more than 4000 scanning lines. However, the 21GHz-band suffers from severe fading due to rain. In order to overcome the large rain attenuation, a reconfigurable antenna with an array-fed reflector is effective for the 21GHz-band Satellite system. Therefore, we designed and manufactured an experimental model of an array-fed imaging reflector antenna for the 21GHz-band Broadcasting Satellite system. We verified the characteristics by measurement. We describe the configuration of the manufactured antenna and the radiation pattern of the imaging reflector calculated by using the measured radiation pattern of the feed array. A 7dB boosted beam has been successfully obtained.