Czasopismo | ELEKTRONIKA - KONSTRUKCJE, TECHNOLOGIE, ZASTOSOWANIA | Rocznik 2013 - zeszyt 8

Frequency detectors of the terahertz domain based on stratified structure

nr katalogowy: 78821

The benefits of frequency modulation Amplitude modulations, both analog and digital ones, have important advantages that contribute to its wide use in telecommunication systems. These advantages include simple receiver for amplitude-modulated waves. Various kinds of amplitude modulations are used in the radio frequency domain, microwave, optical domains. The disadvantage is that the effect of noise in channel transmission leads to significant distortions of the amplitude (significant position) signal, therefore, to reduce the noise immunity. In addition, the amplitude modulation is energetically unfavorable because it requires high energy of the transmitted signal. Another disadvantage of amplitude modulation is a wide frequency band; it is twice as wide spectrum of the modulating signal. These disadvantages are significantly reduced when using a system with frequency modulation [1]. However, in the terahertz regions to date, such systems are not used. One of reason for this is, in our point of view, lack of terahertz frequency detectors. Indeed, the scientific literature is widely various methods of frequency modulation and signal processing of optical and microwave ranges, except for a demodulation. No company introduced the frequency detector mentioned ranges. However it should be noted that the terahertz range is very important for the transmission and processing of signals at present. In scientific literature it has been only a few papers [2.4] describing the possibility of these devices, and therefore the development of terahertz and optical communication systems with frequency modulation signal. These devices are based on anisotropic materials by using the penetration effect of a wave. Thus, such devices are quite bulky. In this paper the frequency terahertz detectors based on isotropic stratified structures are offered. Note again that in spite of the extreme simplicity of implementation, such devices are still not d[...]

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2013-8

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