Retrodirective Systems

Shiroma, Wayne A.; Miyamoto, Ryo; Shiroma, G.S.; Ohta, Aaron T.; Tamamoto, Michael; Murakami, B.T.

doi:10.1002/0471654507.eme516

Cited by 9 publications

(5 citation statements)

References 16 publications

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“…The retrodirective array is evaluated by measuring its bistatic patterns for signals incident from various angles [5]. The measurement setup is shown in Figure 7.…”

Section: B Retrodirective Array Measurement and Discussionmentioning

confidence: 99%

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A New Millimeter-Wave Broadband Retrodirective Antenna Array

Ren

Chang

2007

2007 IEEE/MTT-S International Microwave Symposium

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This paper reported a broadband 8x16 retrodirective array for millimeter-wave applications. The array element is a proximity-coupled dual-ring antenna with a bandwidth of 33.7% (31-42.8 GHz). The antenna is used to build a 4x4 retrodirective array as a sub-array. Then the sub-arrays are assembled to form an 8x16 array. The design method of the arrays and the measured performances from 32 GHz to 40 GHz are presented.

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“…The retrodirective array is evaluated by measuring its bistatic patterns for signals incident from various angles [5]. The measurement setup is shown in Figure 7.…”

Section: B Retrodirective Array Measurement and Discussionmentioning

confidence: 99%

“…The retrodirective array has been used in many wireless communication systems and satellite communications due to its automatic beam steering feature [1][2][3][4][5][6]. It does not require any known information of the source location but is able to resend the incident wave toward to where it comes from.…”

Section: Introductionmentioning

confidence: 99%

A New Millimeter-Wave Broadband Retrodirective Antenna Array

Ren

Chang

2007

2007 IEEE/MTT-S International Microwave Symposium

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“…poorly trained teacher + poor quality school + unprepared student = national poverty!" (Shiroma;Evangelista, 2014, p. 13). The authors argue that if this situation were described in this way, the entire resolution would be encompassed in teacher training; maintaining this approach, we would fail to see, through the lens of the above reference, that often students' difficulties enter classrooms occupying their time and thought.…”

Section: Final Considerationsmentioning

confidence: 99%

Records Mobilized by Pedagogical Students in the Introductory Study of Probability

Lima,

Viali,

Paula

2024

EMR

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This text aims to identify the difficulties and possible misunderstandings of probabilistic content among Pedagogy students, through different records obtained from the resolution of three activities involving probabilistic problems. Methodologically, an interpretative qualitative description was adopted, analyzing the responses and reflections of teachers in initial training expressed during the development of the proposed activities. This case study was carried out with a class composed of 14 academics studying the Degree in Pedagogy at a public university in the State of Pará, Brazil. The results indicate that the teaching of probability depends on the teacher's familiarity with the particularities of this content and recognition, by part of the student, of the subject covered, as well as the objects mobilized in the study. The analysis of the protocols, with the observation of the discussions carried out by the research subjects during the resolution of the probabilistic problems, allowed us to verify that the students had difficulties in converting the record from the fractional form to the decimal form or from the decimal form to the percentage. In this sense, it was found that students discuss the procedures studied when they can suggest other ways of organizing the situation presented. Therefore, the context in which the activity is structured needs to be able to receive interventions from the student and only after starting discussions on procedures and calculations to be developed.

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“…Most retrodirective arrays demonstrated to date [1], [10] are based on the heterodyne method [11] in which an incoming RF signal at each element is mixed with an LO signal at twice the frequency. The major shortcoming of this architecture is that the retrodirected signal strength at the output of the array is entirely dependent on the distance from the interrogator, making these arrays susceptible to an roundtrip path loss.…”

Section: B Self-phasing Arraysmentioning

confidence: 99%

A 2-D Phase-Detecting/Heterodyne-Scanning Retrodirective Array

Watanabe

Pang

Takase

et al. 2007

IEEE Trans. Microwave Theory Techn.

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A 2-D retrodirective array based on phase detection and heterodyne scanning is presented. The system integrates two single voltage-controlled oscillator phase-shifting networks that are autonomously controlled via a phase-detecting array and control circuit that eliminates the 4 path loss typical of other retrodirective arrays. Retrodirectivity is reported for angles of 0 , +15 , and 15 at a transmitting frequency of 6.5 GHz.

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Retrodirective Systems

Cited by 9 publications

References 16 publications

A New Millimeter-Wave Broadband Retrodirective Antenna Array

A New Millimeter-Wave Broadband Retrodirective Antenna Array

Records Mobilized by Pedagogical Students in the Introductory Study of Probability

A 2-D Phase-Detecting/Heterodyne-Scanning Retrodirective Array

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