This paper proposes an empirical analysis of the thermal influence on the electrical behavior of a flexible passive patch antenna which is printed on a Kapton-based substrate. The measurement protocol along with the use of the thermal chamber enabling the temperature control is presented. The experimental setup for measuring the input reflection coefficient with temperature variation ranging from 25°C to 150°C is described. Then, the input impedance of the tested microstrip circuit is analyzed given the quality factor and the antenna bandwidth. It is seen that, increasing the temperature decreases the quality factor of the antenna which is also noticeable through the matching level of the reflection coefficient. This is mainly explained by the drop of the conductivity of the top conductor made by silver ink-jet printing.
[1]
Dae-Geun Yang,et al.
Flexible Hilbert-Curve Loop Antenna Having a Triple-Band and Omnidirectional Pattern for WLAN/WiMAX Applications
,
2012
.
[2]
S. Best,et al.
Impedance, bandwidth, and Q of antennas
,
2005
.
[3]
Hannu Tenhunen,et al.
Development and Analysis of Flexible UHF RFID Antennas For "Green" Electronics
,
2012
.
[4]
H. R. Raad,et al.
Flexible and Compact AMC Based Antenna for Telemedicine Applications
,
2013,
IEEE Transactions on Antennas and Propagation.
[5]
R. A. Matula.
Electrical resistivity of copper, gold, palladium, and silver
,
1979
.