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

Calculation of antenna input impedance by TLM method

Electronics Letters ◽

10.1049/el:19951500 ◽

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

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An experimental investigation into the control of antenna input impedance through cancellation of near field standing energy

1998 IEEE Aerospace Conference Proceedings (Cat. No.98TH8339) ◽

10.1109/aero.1998.685814 ◽

2002 ◽

Cited By ~ 1

Author(s):

C.A. Grimes ◽

J.L. Horn ◽

F. Tefiku ◽

R. Shahidain ◽

D.M. Grimes

Keyword(s):

Experimental Investigation ◽

Input Impedance ◽

Near Field ◽

Antenna Input

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An RF Electronically Controlled Impedance Tuning Network Design and Its Application to an Antenna Input Impedance Automatic Matching System

IEEE Transactions on Microwave Theory and Techniques ◽

10.1109/tmtt.2003.821909 ◽

2004 ◽

Vol 52 (2) ◽

pp. 489-497 ◽

Cited By ~ 127

Author(s):

J. deMingo ◽

A. Valdovinos ◽

A. Crespo ◽

D. Navarro ◽

P. Garcia

Keyword(s):

Network Design ◽

Input Impedance ◽

Automatic Matching ◽

Antenna Input

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

Sensors ◽

10.3390/s19010170 ◽

2019 ◽

Vol 19 (1) ◽

pp. 170 ◽

Cited By ~ 4

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.

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Antenna input impedance: experimental confirmation and geological application

Canadian Journal of Physics ◽

10.1139/p88-134 ◽

1988 ◽

Vol 66 (9) ◽

pp. 818-823 ◽

Cited By ~ 7

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.

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