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Radioengineering

Radioeng

Proceedings of Czech and Slovak Technical Universities

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September 2022, Volume 31, Number 3 [DOI: 10.13164/re.2022-3]

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S. M. Feng, S. Y. Wang, L. F. Wang [references] [full-text] [DOI: 10.13164/re.2022.0255] [Download Citations]
Two-Dimensional Signal Detection Algorithm for Omni-Directional Signal Receiving Using Low-Frequency Orthogonal Magnetic Antenna

This paper proposes a two-dimensional signal detection algorithm for low-frequency signal receiving using orthogonal magnetic antenna. According to the directional properties of a single antenna, the direction coefficient is introduced into the model. The algorithm based on Markov Chain Monte Carlo (MCMC) method can accurately estimate the direction coefficient and parameters of the noise in order to perform signal detection. The results show that the proposed algorithm is less affected by the direction of arrival and performs better, in terms of bit error rate, than that based on one-dimensional model. This study provides a valuable reference to omni-directional receiving of signals in low-frequency communication.

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Keywords: Orthogonal antenna, omni-directional receiving, parameters estimation, non-Gaussian noise

H. S. Zhu, W. H. Hu, B. F. Guo, X. X. Zhu, D. F. Xue, C. A. Zhu [references] [full-text] [DOI: 10.13164/re.2022.0262] [Download Citations]
Bistatic ISAR sparse aperture maneuvering target translational compensation imaging algorithm

For bistatic inverse synthetic aperture radar (Bi-ISAR), the non-uniform motion state of maneuvering target and the time-varying bistatic angle make the traditional imaging method of moving target face the problem of translation compensation, and the traditional translation compensation method is not suitable for the return wave in the case of sparse aperture. In this paper, a compensation imaging method combining two-dimension joint linearized Bregman iteration and image contrast search is proposed. The translation compensation problem can be transformed into two-dimension joint compressed sensing sparse reconstruction and moving target motion parameter estimation. The proposed algorithm makes use of the gain of echo two-dimension compression, greatly improves the accuracy of translation compensation and the quality of target image and has strong robustness to noise. The processing results of simulation data verify the effectiveness and superiority of the algorithm.

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Keywords: Bistatic-ISAR, maneuvering target, sparse aperture, translational compensation

B. Minnaert [references] [full-text] [DOI: 10.13164/re.2022.0273] [Download Citations]
Unified Expression of the Conjugate Image Impedances for Two-port Representations

Conjugate image impedances are used to minimize power reflections in a variety of domains, including amplifier design, microwave engineering, wireless power transfer, antenna design and millimeter wave applications. For a two-port network, they can be described as function of different parameters including impedance, admittance, hybrid, inverse hybrid, chain, scattering and chain scattering parameters. In this work, a general unified structure for the conjugate image impedances is provided, valid for each of the two-port representations. It highlights its close relationship with the Rollett stability factor and provides insight into the structure of conjugate image impedances.

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Keywords: Circuit theory, conjugate image, two-port networks

E. M. Cheng, K. Y. Lee, S. F. Khor, N. F. Mohd Nasir, C. W. S. R. Mohamad, N. A. Abdul Aziz, E. Z. Mohd Tarmizi, S. A. Baharuddin [references] [full-text] [DOI: 10.13164/re.2022.0281] [Download Citations]
Microwave Dielectric and Reflection Analysis on Pure and Adulterated Trigona Honey and Honey Gold

Honey adulteration is common in food industry, as it provides cheaper alternative for user to consume honey. However, it has been abused by industry runners with unsavory practices. It leads to business fraudulency. Pure honey is very precious due to its powerful health-giving properties. It rises attention of beekeeper, wholesaler, food manufacturer, retailer and consumer because this issue has been sensationally reported in media mass. Enforcement of law is initiated to mitigate the abuse and fraudulency. Apart from that, it motivates scientists, technologists and engineers to strive for an effective solution. Microwave sensing method is well known in agricultural product and food. Hence, dielectric and reflection response is explored for the potential of development of instrumentation system in gauging edible honeys. In this work, the dielectric and reflection measurement were conducted using Agilent E8362B PNA Network Analyzer in conjunction with Agilent 85070E Performance Probe from 0.5 GHz to 4.5 GHz. Dielectric and reflection measurement were conducted to investigate its dielectric behavior and mismatch impedance due to water and sucrose content in honey. It can be noticed that dielectric constant, ε’ decreases when frequency increases. In the meantime, ε’ decreases with increment of water and sucrose content for Honey Gold and Trigona Honey. Meanwhile, for water adulterated Honey Gold and Trigona Honey, loss factor, ε” decrease when frequencies increases. In addition, ε” decreases when water content < 36% and < 43% for Honey Gold and Trigona Honey, respectively. It can be found that at 1 GHz to 4 GHz, ε” increases when sucrose content increases which applicable for Honey Gold and Trigona Honey. In reflection measurement, magnitude of reflection coefficient, |Γ| decrease when frequency increases for all percentage of water and sucrose content for both honeys. Withal, phase, -φ increases as frequency increases for both water adulterated honeys. -φ varies insignificantly when sucrose content increases for both sucrose adulterated honeys.

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Keywords: Honey, sucrose, water, dielectric, reflection