Wyniki wyszukiwania - BazTech

1

Slotted Patch Antenna with Wide Bandwidth for In-body Biotelemetry Applications

Mishra Piyush Kumar, Mathur Keshav, Tripathi Vijay Shanker

Journal of Telecommunications and Information Technology

|

2024

|

nr 2

17--22

EN

This paper proposes a slotted patch antenna with wide bandwidth covering ISM frequency band (2.40-2.48 GHz) for implantable biotelemetry applications. A homogeneous skin phantom (HSP) model proves the usability of the proposed antenna in in-body environments. At a resonance frequency of 2.42 GHz, the design shows an S11 parameter of -35.56 dB, a percentage impedance bandwidth of 66.6% (2-4 GHz), and the maximum peak gain of -24.80 dBi. To validate the simulated results, the designed antenna was fabricated and measured, showing good compliance with the expected results. To ensure tissue safety, a specific absorption rate (SAR) is simulated for the proposed antenna which satisfies the requirements of IEEE standards, with a value of 87.75 W/kg for 10 g of tissue. The proposed antenna shows a telemetry range of 11 and 6.3 m at 7 kbps and 100 kbps data rates, respectively. The key features of the proposed antenna include the following: miniaturization, good S parameters, wide bandwidth, low SAR, good telemetry range, and high gain.

2

Wpływ rozrzutu wymiarów geometrycznych na parametry szyku antenowego wykonanego w technologii LTCC

Gawlik J., Yashchyshyn Y.

Przegląd Telekomunikacyjny + Wiadomości Telekomunikacyjne

|

2018

|

nr 6

304--307, CD

PL

W artykule zostały przedstawione wyniki badań symulacyjnych szyku antenowego składającego się z szesnastu promienników, pracującego na częstotliwości 24 GHz i przeznaczonego do wykonania w technologii LTCC. Badania obejmowały oszacowanie wpływu zmian długości i szerokości ścieżek mikropaskowych oraz promienników, a także wysokości podłoża na osiągane przez antenę parametry. Przeanalizowano również wpływ rozrzutu przenikalności elektrycznej podłoża anteny. Z obserwacji wynika, że modyfikacja długości ścieżek mikropaskowych o ±10 μm powoduje największe zmiany parametrów, w szczególności przesunięcie częstotliwości rezonansowej anteny o około 100 MHz.

EN

The paper presents simulation results of microstrip antenna array consists of 16 radiators, which operates at frequency of 24 GHz. Antenna array is intended for realization in LTCC technology (Low Temperature Cofired Ceramic). The researches included simulations of modified antenna elements dimensions – length, width of microstrip lines, radiators and substrate’s high and their influence on antenna’s parameters. Moreover, the influence of variable permittivity of the substrate was studied. On the basis of researches it was determined, that the biggest impact on antenna array’s performance has length of microstrip lines. Changes in those parameters have caused resonant frequency shift of 100 MHz.

3

Statistical Analysis of Indoor RSSI Read-outs for 433 MHz, 868 MHz, 2.4 GHz and 5 GHz ISM Bands

Chruszczyk Ł.

International Journal of Electronics and Telecommunications

|

2017

|

Vol. 63, No. 1

33--38

EN

This paper presents statistical analysis of RSSI readouts recorded in indoor environment. Many papers concerning indoor location, based on RSSI measurement, assume its normal probability density function (PDF). This is partially excused by relation to PDF of radio-receiver's noise and/or together with influence of AWGN (average white Gaussian noise) radio-channel – generally modelled by normal PDF. Unfortunately, commercial (usually unknown) methods of RSSI calculations, typically as "side-effect" function of receiver's AGC (automatic gain control), results in PDF being far different from Gaussian PDF. This paper presents results of RSSI measurements in selected ISM bands: 433/868 MHz and 2.4/5 GHz. The measurements have been recorded using low-cost integrated RF modules (at 433/868 MHz and 2.4 GHz) and 802.11 WLAN access points (at 2.4/5 GHz). Then estimated PDF of collected data is shown and compared to normal (Gaussian) PDF.

4

Comparison of Indoor/Outdoor, RSSI-Based Positioning Using 433, 868 or 2400 MHz ISM Bands

Chruszczyk Ł., Zając A.

International Journal of Electronics and Telecommunications

|

2016

|

Vol. 62, No. 4

395--399

EN

This paper compares accuracy of indoor positioning systems using one of three selected ISM bands: 433, 868 or 2400 MHz. Positioning is based on Received Signal Strength Indication (RSSI), received by majority of ISM RF modules, including lowcost ones. Investigated environment is single, indoor space (e.g. office, hall) and personal use, thus 2-dimensional (2D) coordinate system is used. Obtained results, i.a. average positioning error, are compared with similar measurements taken at outdoor, open space environment. The system is local, i.e. its operational area is limited by range of used RF modules – typical a few tens of meters. The main focus is research of how much accuracy (and usefulness) can be expected from standard RF modules working at typical ISM frequencies.

5

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.