Wyniki wyszukiwania - BazTech

1

Radioelektronika terahercowa - oczekiwania, możliwości i ograniczenia

Yashchyshyn Y., Modelski J.

Przegląd Telekomunikacyjny + Wiadomości Telekomunikacyjne

|

2015

|

nr 4

120--124

PL

Artykuł poświęcono przeglądowi stanu osiągnięć uzyskanych w radioelektronice częstotliwości terahercowych oraz możliwości ich zastosowania w terahercowej komunikacji bezprzewodowej. Wyniki ostatnich badań wskazują że bezprzewodowa komunikacja terahercowa, ze względu na swoje możliwości. będzie miała duży wpływ na rozwój przyszłych systemów bezprzewodowych.

EN

The article is devoted to the review of the state of the achievements in the radioelectronics of terahertz frequency and their possible applications in terahertz wireless communications. The results of recent studies indicate that terahertz wireless communication due to its capabilities, will have a big impact on the development of future wireless systems.

2

Design of a nanoswitch in 130 nm CMOS technology for 2.4 GHz wireless terminals

Bhuiyan M. A., Reaz M. B. I., Jalil J., Rahman L. F.

Bulletin of the Polish Academy of Sciences. Technical Sciences

|

2014

|

Vol. 62, nr 2

399--406

EN

This paper proposes a transmit/receive (T/R) nanoswitch in 130 nm CMOS technology for 2.4 GHz ISM band transceivers. It exhibits 1.03-dB insertion loss, 27.57-dB isolation and a power handling capacity (P1 dB) of 36.2-dBm. It dissipates only 6.87 μW power for 1.8/0 V control voltages and is capable of switching in 416.61 ps. Besides insertion loss and isolation of the nanoswitch is found to vary by 0.1 dB and 0.9 dB, respectively for a temperature change of 125°C. Only the transistor W/L optimization and resistive body floating technique is used for such lucrative performances. Besides absence of bulky inductors and capacitors in the schematic circuit help to attain the smallest chip area of 0.0071 mm2 which is the lowest ever reported in this frequency band. Therefore, simplicity and low chip area of the circuit trim down the cost of fabrication without compromising the performance issue.

3

Synchronizowana sieć pomiarowa

Kubiak Z.

Studia Informatica

|

2013

|

Vol. 34, nr 3

117--129

PL

W artykule przedstawiono opracowanie protokołu SMN (ang. Synchronized Measurement Network) oraz uwarunkowania, wynikające ze specyfiki wybranych radiowych układów nadawczo-odbiorczych. Prezentowane rozwiązanie należy do bezprzewodowych sieci sensorowych (ang. WSN – Wireless Sensor Networks). Protokół SMN jest przeznaczony do synchronizowanej, bezprzewodowej realizacji pomiarów rozproszonych. Omawiana sieć zapewnia możliwość energooszczędnej pracy jej węzłów oraz spełnia warunki bezpieczeństwa transmisji.

EN

This paper presents the development of SMN protocol (Synchronized Measurement Network) and conditions resulting from the specificity of selected radio transceiver systems. This solution is a wireless sensor network (WSN – Wireless Sensor Networks). SMN protocol is designed for execution of synchronized, distributed wireless measurement. The presented network provides the possibility of energy-saving work of its nodes and meets the security conditions of transmission.

4

Accurate Phase Calibration for Digital Beam-Forming in Multi-Transceiver HF Radar System

Nguyen H. Q., Whittington J. S., Devlin J. C., Vu H. L., Vu N. V., Custovic E.

International Journal of Electronics and Telecommunications

|

2013

|

Vol. 59, No. 3

245-254

EN

The TIGER-3 radar is being developed as an “all digital” radar with 20 integrated digital transceivers, each connected to a separate antenna. Using phased array antenna techniques, radiated power is steered towards a desired direction based on the relative phases within the array elements. This paper proposes an accurate phase measurement method to calibrate the phases of the radio output signals using Field Programmable Gate Array (FPGA) technology. The method sequentially measures the phase offset between the RF signal generated by each transceiver and a reference signal operated at the same frequency. Accordingly, the transceiver adjusts its phase in order to align to the reference phase. This results in accurately aligned phases of the RF output signals and with the further addition of appropriate phase offsets, digital beamforming (DBF) can be performed steering the beam in a desired direction. The proposed method is implemented on a Virtex-5 VFX70T device. Experimental results show that the calibration accuracy is of 0.153 degrees with 14 MHz operating frequency.

5

Eter jest nasz

Pudło M.

Geodeta : magazyn geoinformacyjny

|

2005

|

nr 4

47--49