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Measurements of Wearable Systems and Antennas
Published in Albert Sabban, Novel Wearable Antennas for Communication and Medical Systems, 2017
Typical parameters of antennas are radiation pattern, gain, directivity, beam width, polarization, and impedance. During antenna measurements we ensure that the antenna meets the required specifications and we can characterize the antenna parameters.
Design and Measurements Process of Wearable Communication, Medical and IOT Systems
Published in Albert Sabban, Wearable Systems and Antennas Technologies for 5G, IOT and Medical Systems, 2020
Typical parameters of antennas are radiation pattern, gain, directivity, beam width, polarization and impedance. During antenna measurements we ensure that the antenna meets the required specifications and we can characterize the antenna parameters.
A Novel Compact Multiband Reconfigurable WLAN MIMO Antenna
Published in IETE Journal of Research, 2023
A. Bharathi, Ravi Shankar Reddy Gosula
The scattering parameter performance of the proposed antenna is evaluated using an Agilent Technologies, 50 MHz to 20 GHz Vector Network Analyzer (8720ET). The antenna measurements are carried out by feeding the signal to one of the antenna elements, simultaneously terminating the port of other antenna element with 50 Ohm load impedance. A DC regulated supply is used for providing either a +0.8V or −0.8V DC voltage supply to the PIN diodes to attain the forward bias condition or reverse bias condition, respectively. Figure 8 depicts the reflection coefficient and isolation characteristics of the proposed frequency reconfigurable MIMO antenna. As the MIMO antenna is symmetrical, only S11 and S12 characteristics are shown. Similar results are achieved for S22 and S21. Figure 8(a) shows S parameter characteristics of the proposed frequency reconfigurable MIMO antenna when D1 and D2 diodes are switched ON. It is noticed that the antenna resonates at three WLAN frequencies f1=5.2 GHz, f2=2.4 GHz and f3=5.8 GHz. Reflection coefficient value is observed to be less than −10dB at these frequencies.
Frequency reconfigurable key-shape antenna for LTE applications
Published in Australian Journal of Electrical and Electronics Engineering, 2023
Abdulghafor A. Abdulhameed, Falih M. Alnahwi, Haidar N. Al-Anbagi, Zdeněk Kubík, Abdulkareem S. Abdullah
where D is the maximum antenna dimension, is the operation wavelength and is the minimum distance between transmitter and receiver. A standard horn antenna (1–18) GHz is used as a transmitting antenna in the setup, while the Antenna Under Test (AUT) is used as the receiving antenna. Both antennas are placed inside a anechoic chamber whose internal walls are made of radiation absorbent material (RAM). The procedure of evaluating the radiation pattern and gain has been done according to IEEE Recommended Practice for Antenna Measurements (IEEE 2022).