Calculation of antenna input impedance by TLM method

1995 ◽  
Vol 31 (25) ◽  
pp. 2138-2139
Author(s):  
Y. Huang ◽  
D. Mirshekar-Syahkal ◽  
I.J. Dilworth
Keyword(s):  
Input Impedance ◽  
Tlm Method ◽  
Antenna Input

scholarly journals Investigating the Performance of Bi-Static GPR Antennas for Near-Surface Object Detection

Sensors ◽  
2019 ◽  
Vol 19 (1) ◽  
pp. 170 ◽  
Author(s):  
Xianyang Gao ◽  
Frank J. W. Podd ◽  
Wouter Van Verre ◽  
David J. Daniels ◽  
Anthony J. Peyton
Keyword(s):  
Ground Penetrating Radar ◽  
Input Impedance ◽  
Test Site ◽  
Late Time ◽  
Near Surface ◽  
Object Depth ◽  
Ground Penetrating ◽  
Antenna Input ◽  
Surface Object ◽  
Bow Tie

Antennas are an important component in ground penetrating radar (GPR) systems. Although there has been much research reported on the design of individual antennas, there is less research reported on the design of the geometry of bi-static antennas. This paper considers the effects of key parameters in the setup of a GPR head consisting of a bi-static bow-tie pair to show the effect of these parameters on the GPR performance. The parameters investigated are the antenna separation, antenna height above the soil, and antenna input impedance. The investigation of the parameters was performed by simulation and measurements. It was found when the bi-static antennas were separated by 7 cm to 9 cm and were operated close to the soil (2 cm to 4 cm), the reflected signal from a near-surface object is relatively unaffected by height variation and object depth. An antenna input impedance of 250 Ω was chosen to feed the antennas to reduce the late-time ringing. Using these results, a new GPR system was designed and then evaluated at a test site near Benkovac, Croatia.

Antenna input impedance: experimental confirmation and geological application

1988 ◽  
Vol 66 (9) ◽  
pp. 818-823 ◽  
Author(s):  
J. L. Nicol ◽  
P. V. Ridd
Keyword(s):  
Input Impedance ◽  
Theoretical Calculations ◽  
Experimental Confirmation ◽  
Dipole Antennas ◽  
Impedance Measurements ◽  
Field Surveys ◽  
The Earth ◽  
Antenna Impedance ◽  
Antenna Input

Calculations and measurements of the input impedance of horizontal dipole antennas close to the Earth have been carried out, and the results have been compared with those of other workers. Antenna impedance measurements over both very highly and very poorly conducting ground planes were found to be consistent with theoretical calculations. Finally, a series of measurements traversing an interface between basalt and weathered granodiorite, both covered with soil, indicated that antenna input-impedance measurements can be useful for geological field surveys.

Design of a Varactor-Based Matching Network Using Antenna Input Impedance Variation Knowledge

2011 ◽  
Author(s):  
Cesar Sanchez-Perez ◽  
Jesus de Mingo ◽  
Paloma Garcia-Ducar ◽  
Pedro L. Carro ◽  
Antonio Valdovinos
Keyword(s):  
Input Impedance ◽  
Matching Network ◽  
Impedance Variation ◽  
Antenna Input

scholarly journals Improved measurements of ICRF antenna input impedance at ASDEX Upgrade during ICRF coupling studies

2014 ◽  
Author(s):  
I. Stepanov ◽  
J.-M. Noterdaeme ◽  
V. Bobkov ◽  
D. Coster ◽  
H. Faugel ◽  
...  
Keyword(s):  
Input Impedance ◽  
Antenna Input
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