6 Output spectrum of power amplifier 3.2.2 300GHz transceiver RTD The oscillator is the so-called resonant tunneling diode (RTD), whichoscillates at an appropriate DC bias voltage. By changing the bias voltage, 300-GHz carrier signal ismodulated as ON and OFF depending on the amplitude of the bias voltage. As for the receiver, thedirect-detection receiver is used, as shown in Figure 7. The maximum bit rate was 1.5 Gbps and thetransmission of uncompressed HDTV signals was succeeded by diode technologies. It is also demonstrated that the RTD can be also operated as a detector with high sensitivity. An error-free 2.5 Gbpstransmission at 625 GHz using frequencymultiplier for the transmitterwas also demonstrated. 7 Block diagram of the wireless link using diode technologies [Editor’s note: Information on technical characteristics of THz transceiversneeds to be further provided to prepare for sharing studies between passive and active services at the next meeting] 4 Sensing and imaging THz waves possess moderate substance permeability and good spatial resolution, as well as unique characteristics which other electromagnetic frequency bands do not have, such as spectral fingerprinting of reagents, differentiation of single-stranded and double-stranded DNA, absorption difference of water and ice, and sensitivity toward semiconductor impurities; moreover, THz waves are also safe for the human body. Based on these facts, a wide-range of sensing and imaging applications are expected. 4.1 THz Generation Method 4 summarizes the relationship between THz generation methods and their technologies.
6 Output spectrum of power amplifier 3.2.2 300GHz transceiver RTD The oscillator is the so-called resonant tunneling diode (RTD), whichoscillates at an appropriate DC bias voltage. By changing the bias voltage, 300-GHz carrier signal ismodulated as ON and OFF depending on the amplitude of the bias voltage. As for the receiver, thedirect-detection receiver is used, as shown in Figure 7. The maximum bit rate was 1.5 Gbps and thetransmission of uncompressed HDTV signals was succeeded by diode technologies. It is also demonstrated that the RTD can be also operated as a detector with high sensitivity. An error-free 2.5 Gbpstransmission at 625 GHz using frequencymultiplier for the transmitterwas also demonstrated. 7 Block diagram of the wireless link using diode technologies [Editor’s note: Information on technical characteristics of THz transceiversneeds to be further provided to prepare for sharing studies between passive and active services at the next meeting] 4 Sensing and imaging THz waves possess moderate substance permeability and good spatial resolution, as well as unique characteristics which other electromagnetic frequency bands do not have, such as spectral fingerprinting of reagents, differentiation of single-stranded and double-stranded DNA, absorption difference of water and ice, and sensitivity toward semiconductor impurities; moreover, THz waves are also safe for the human body. Based on these facts, a wide-range of sensing and imaging applications are expected. 4.1 THz Generation Method 4 summarizes the relationship between THz generation methods and their technologies.
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