A Compact Loop Antenna System for Monitoring Local Electromagnetic Environments in Geospace

Yagitani, Satoshi; Ozaki, Mitsunori; Kojima, Hirotsugu

doi:10.1587/transcom.e94.b.1744

Cited by 2 publications

(3 citation statements)

References 8 publications

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“…The NEMI measurement result is almost the same as that obtained by simulation, with the difference being caused by the error in the SPICE parameters and by neglecting the effect of noise due to the drain resistances R d in the simulation. The NEMI for a previous preamplifier (assembled with discrete electronic components by Yagitani et al 2011) combined with the 0.01m 2 loop (15 turns) is also plotted in Fig. 7.…”

Section: Resultsmentioning

confidence: 99%

Development of an ASIC preamplifier for electromagnetic sensor probes for monitoring space electromagnetic environments

et al. 2016

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Background: Multipoint observations of plasma waves are essential for separating spatial and temporal variations of a plasma turbulence. Miniaturization and high environmental (temperature and radiation) robustness are key requirements for scientific instrument design toward a sensor network consisting of palm-sized probes. With increasing these demands, a preamplifier for the 3-axis loop antenna of an electromagnetic sensor probe has been developed by using application-specific integrated circuit (ASIC) technology with a 0.25-μm complementary metal-oxide-semiconductor process. Findings: In the present study, a new temperature compensation method is proposed by using the open-loop gain of the ASIC preamplifier with a bandgap reference (BGR) circuit. Usually, the gain is characterized by the closed-loop gain, which is governed by the accuracy of the polysilicon resistances in a chip. The open-loop gain is characterized by the effective transconductance of the ASIC preamplifier, which often has a negative temperature dependence. The temperature dependence of the gain can be dramatically improved by using the temperature-compensated BGR circuit to cancel out the negative dependence of the transconductance. The temperature dependence of the gain was about −0.01 dB/ • C in the frequency range within the closed-loop bandwidth. On the other hand, the temperature dependence of the gain at 60 kHz operating with the open-loop gain was improved from −39 × 10 −3 to −2.6 × 10 −3 dB/ • C by using the temperature-compensated BGR circuit. Moreover, the radiation robustness for the total ionizing dose (TID) level is evaluated by irradiation with gamma rays from cobalt-60. The ASIC preamplifier is not sensitive to TID effects when a thin gate oxide is used. The ASIC preamplifier showed a high radiation tolerance to at least a total ionizing dose level of 400 krad(Si). Finally, the effectiveness of the ASIC preamplifier is evaluated on the basis of a virtual sounding rocket experiment using theoretical calculations of LF standard electromagnetic waves. Conclusions: Fundamental issues (miniaturization, low-noise performance, and high environmental robustness) are solved by the presented ASIC preamplifier. The success in developing the high robustness ASIC preamplifier leads to a future mission using a lot of palm-sized probes in space.

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Section: Resultsmentioning

confidence: 99%

Development of an ASIC preamplifier for electromagnetic sensor probes for monitoring space electromagnetic environments

et al. 2016

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“…12 Frequency response calculated by received data in this paper. The performances of the first version of the electromagnetic sensors are introduced in Kojima et al (2010) and Yagitani et al (2011). While the design of the electric field preamplifier is basically the same with that of Kojima et al (2010), the preamplifiers of the loop antennas in the present prototype are newly designed and implemented in the ASIC chip.…”

Section: Discussionmentioning

confidence: 99%

“…Figure 1 shows a conceptual illustration of the proposed MSEE. Each sensor probe has the ability to measure plasma waves and transfer observation data to a central station, such as a satellite or a rocket (Kojima et al 2010;Yagitani et al 2011). Each sensor probe directly communicates with the central station.…”

Section: Introductionmentioning

confidence: 99%

Small sensor probe for measuring plasma waves in space

et al. 2015

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Background: Since conventional one-point observations of plasma phenomena in space cannot distinguish between time and spatial variations, the missions on the basis of multiple-point observations have become the trend. We propose a new system for multiple-point observation referred to as the monitor system for space electromagnetic environments (MSEE). Findings: The MSEE consists of small sensor probes that have a capability to measure electromagnetic waves and transfer received data to the central station through wireless communication. We developed the prototype model of the MSEE sensor probe. The sensor probe includes a plasma wave receiver, the microcontroller, the wireless communication module, and the battery in the 75-mm cubic housing. In addition, loop antennas, dipole antennas, and actuators that are used for expanding dipole antennas are attached on the housing. The whole mass of the sensor probe is 692 g, and the total power consumption is 462 mW. The sensor probe can work with both inner battery and external power supply. The maximum continuous operation time on battery power is more than 6 h. We verified the total performance for electric field measurements by inputting signal to preamplifier. In this test, we found that analog components had enough characteristics to measure electric fields, and the A/D conversion and the wireless transmission worked correctly. In the whole performance for electric fields, the sensor probe has equivalent noise level of −135 dBV=m= ffiffiffiffiffi Hz p .

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A Compact Loop Antenna System for Monitoring Local Electromagnetic Environments in Geospace

Cited by 2 publications

References 8 publications

Development of an ASIC preamplifier for electromagnetic sensor probes for monitoring space electromagnetic environments

Development of an ASIC preamplifier for electromagnetic sensor probes for monitoring space electromagnetic environments

Small sensor probe for measuring plasma waves in space

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