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1
Content available Study on Metamaterial-based Bio-inspired Microstrip Antenna Array for 5G Enabled Mobile Health Technology
Colaco John, Cotta Jillian
International Journal of Electronics and Telecommunications
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2022
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Vol. 68, No. 2
201--207
EN
5G is a fifth-generation wireless technology that enables extremely fast data transfers and massive connection capacity. Existing Mobile health technology requires more reliable connection power and data transfer rates. The purpose of this research is to design, analyse, and compare the performance of a bio-inspired lotus-shaped microstrip patch antenna array with two to three radiating elements. The proposed antenna utilizes proximity coupled indirect microstrip transmission line feeding technique operating in the 24 GHz-30 GHz frequency band. The results indicate that performance continues to improve as the number of radiating elements increases. Moreover, each radiating element is loaded with complementary and non-complementary split-ring resonators (SRRs). The performance of the proposed microstrip antenna array is then analysed and compared with and without split-ring resonators. The findings validate that the proposed bio-inspired metamaterial-based microstrip patch array antenna is more reliable and performs better than an antenna without SRRs.
2
Content available Theory of Synthesis of Asymmetrical Delay Line with the Surface Acoustic Wave
Šimko Milan, Gutten Miroslav, Chupáč Milan, Kučera Matej, Glowacz Adam, Kantoch Eliasz, Liu Hui, Brumercik Frantisek
Archives of Acoustics
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2019
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Vol. 44, No. 1
117--127
EN
The aim of this publication is to design a procedure for the synthesis of an IDT (interdigital transducer) with diluted electrodes. The paper deals with the surface acoustic waves (SAW) and the theory of synthesis of the asymmetrical delay line with the interdigital transducer with diluted electrodes. The authors developed a theory, design, and implementation of the proposed design. They also measured signals. The authors analysed acoustoelectronic components with SAW: PLF 13, PLR 40, delay line with PAV 44 PLO. The presented applications have a potential practical use.
3
Content available Enlarging the bandwidth of a two-dimensional photonic crystal mirror in the visible range
Voznyuk I., Boutami S., Glière A.
Optica Applicata
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2017
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Vol. 47, nr 2
175--182
EN
The spectral properties of reflective mirrors based on a classic design of two-dimensional subwavelength photonic crystal are investigated numerically in the visible wavelength range. These reflectors are meant to be made of silica and silicon nitride. A novel numerical strategy is proposed in order to determine the optimal value of the grating fill factor yielding an efficient level of reflectance through the maximal range of wavelengths.
4
Content available Ewolucja zapalników czasowych
Bazela R., Cykier L.
Problemy Techniki Uzbrojenia
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2013
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R. 42, z. 125
45--53
PL
W artykule przedstawiono rozwój zapalników czasowych w kontekście zmieniającego się pola walki, rozwoju technicznego i technologicznego broni na przestrzeni lat. Pokazany został postęp w technologii pomiaru czasu przez układy odporne na siły występujące podczas strzału.
EN
In the paper the evolution of time fuses against the background of changing battlefield, technical and technological advancements in armament over a span of years was presented. The development in the technology of time measurement with the use of the systems resistant to the forces occurring during firing was also shown.
5
Content available Modulator structures for radio-on-fiber applications
Hum S.V., Okoniewski M., Davies R. J.
Journal of Telecommunications and Information Technology
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2003
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nr 1
8-14
EN
Traditional electro-optic modulators are not optimized for bandpass applications such as radio-on-fiber delivery systems due to their limited electro-optic response. This paper presents a resonant electrode structure that can be employed in optical modulator designs to enhance the electro-optic response of the modulator over a narrow frequency band, and improve the performance of optical radio systems. A simple model of the structure is developed, and experimental results validating the model and illustrating the effectiveness of the structure are presented.
6
Technologia i właściwości rezonatorów z akustyczną falą powierzchniową na częstotliwość 423, 22 i 433, 92 MHz
Soluch W., Wróbel T., Hechner J., Niewczas B.
Elektronika : konstrukcje, technologie, zastosowania
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1998
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Vol. 39, nr 9
3-6
PL
Rezonatory o częstotliwości rezonansowej 423,22 MHz i 433,92 MHz są stosowane w urządzeniach alarmowych ruchomych lub stacjonarnych. Rezonatory zaprojektowano metodą macierzy rozproszenia; mogą one funkcjonować jako czwórnikowe lub dwójnikowe. W artykule przedstawiono niektóre problemy technologiczne oraz parametry elektryczne rezonatorów w konfiguracji czwórnikowej i dwójnikowej. Zamieszczono także, przykładowe charakterystyki amplitudową i fazową oraz wykres admitancji rezonatora.
EN
Surface acoustic wave resonators (SAW) on ST cut quartz for frequences 423.22 MHz and 433.92 MHz were designed, fabricated and measured. The resonators can operate in a two port or one port configurations and can be used in different types of alarms. The lift-off photolitographic technology, used for fabrication of the resonators, is described, and the measured parameters of the resonators are presented.
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