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Microwave Spatial-power Combining Technology
- Spatial Superposition-

We propose a system that enables spatial superposition of two beams efficiently by using a specially tailored circular array system.

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Compared with a non-spatial power-combining process with microwave circuits that have insertion losses and that reduce the transmitted power, the spatial power-combining technology enables an efficient power-combining process.

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One of the features of the array system is the beam steering function. We investigated the allowable beam steering angle to satisfy the required spatial superposition and showed that the spatial superposition was achieved within the range of about +/- 8 degrees from the center when the two beams were steered by 10 degrees.

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We also investigated the effect of gain/phase setting errors evident among array elements and clarified that the spatial superposition angle of 5 degrees can be attained even when a gain setting error of 1 dB and a phase setting error of 15 degrees are evident.

 

In addition, we studied the effect of the failure of elements constituting our system on spatial superposition and created a compensation method to maintain the performance after the elements fail.

 

We found that our system was feasible and reliable and enabled broadband transmission with efficient use of power and bandwidth.

Fig. 1 Spatial combining with two antennas.

Fig. 2 Phase difference due to propagation distances.

Fig. 3 Two-beam array antenna suitable for suppressing phase difference.

Fig. 4 Radiation pattern for one beam. 
 

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Fig. 5 High gain antenna for two-beam spatial superposition (Ref. 1).  
 

Published papers：

  1. Masayoshi Tanaka and Daiki Yamaguchi, Spatially Superposed Highly Efficient 64QAM Transmission System, AIAA ICSSC2016, AIAA 2016-5738,pp1-9, Oct. 2016. Ref,  Ref pdf

  2. Masayoshi Tanaka and Takahiro Ohkubo, Spatially Superposed Highly Efficient 32APSK Transmission System, AIAA ICSSC2015, AIAA 2015-4334, pp1-9, Sept. 2015. Masayoshi Tanaka and Takahiro Ohkubo, "Spatially Superposed Highly Efficient 32APSK Transmission System", AIAA-2015-4334. Ref,  Ref pdf

  3. Masayoshi TANAKA, and Takuya Eguchi, Beam Steering Characteristics and Element Failure Compensation of Spatially Superposed M-ary Modulation System, 27th AIAA International Communications Satellite Systems, AIAA, ICSSC, AIAA-2009_3.3.4,2009.  (Ref pdf)

  4. Masayoshi Tanaka & Takuya Eguchi, "Spatially Superposed 64-QAM Communication System", AIAA, ICSSC, AIAA-2006-5347,2006 Ref.  Ref pdf

  5. Yuya 　Takada, and Masayoshi Tanaka, "A Study on Band Limiting of Transmission Wave with Spatially Superposition", IEICE, National Conf., B-3-8,2008

  6. Takuya Eguchi, and Masayoshi Tanaka， Beam Steering Characteristics and Element Failure Compensation of Spatially Superposed M-ary Modulation System， IEICE, National Conf.,,2007

  7. Takuya Eguchi, and Masayoshi Tanaka， Influence of Amplitude and Phase Setting Errors on Two-Beam Spatial Superposition， IEICE, National Conf., B-1-152, 2006

  8. Masayoshi Tanaka, and Takuya Eguchi， A Study on Spatially Superposed M-ary Communications System， IEICE, Comm society conf.,B-3-3，2006

  9. Takuya Eguchi, and Masayoshi Tanaka， "Phased Array Antenna System for Spacially Superposed M-ary Modulation ", IEICE, National Conf., B-1-47，2006

  10. Masayoshi Tanaka， "Transmission Performance of Space Power Combined Superposed 16-QAM Communication System", Simulation,vol-24,1，pp75-82，2005.

  11. M.Tanaka, "New M-ary QAM Transmission Payload System",AIAA, ICSSC2005, I000249, 2005, Sept.  Ref pdf.

  12. M.Tanaka, "New Power and Frequency Efficient Satellite Communications System with Space Power-Combining and Superimposed Modulation Technology", AIAA ICSSC, AIAA-2003-2288, 2003, April Ref,  Ref pdf.

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