Investigation of the double-y balun for feeding pulsed antennas

Detection and Remediation Technologies for Mines and Minelike Targets IX

2004

Self Cite

The resistive vee dipole (RVD) loaded with the Wu-King profile has many advantages for use in groundpenetrating radar (GPR) applications. It can be designed to transmit a temporally-short pulse to a small spot on the ground. The shape of the transmitted pulse is simply related to the input signal, e.g., a derivative. The RVD also has a low radar cross section. In addition, it can be easily manufactured using a circuit board and discretely loading it with chip resistors. One drawback of the RVD is that the input impedance of the RVD increases significantly with decreasing frequency and, therefore, has a high voltage standing wave ratio (VSWR) at low frequencies, which limits the low-frequency response of the antenna. To improve the low-frequency response, a discretely-loaded resistive linear antenna (RLA) has been developed, whose basic principle of operation is the same as that of the RVD. The RLA has curved arms loaded with a modified Wu-King profile instead of straight arms loaded with the Wu-King profile. With an appropriate selection of the curve and the loading profile, the low-frequency response is significantly better for the RLA than for the RVD. The RLA has been developed using a method of moments code. The performance of the RLA is validated both numerically and experimentally.

Section: Antenna Measurementmentioning

confidence: 99%

A resistive linear antenna for ground-penetrating radars

Kim

Detection and Remediation Technologies for Mines and Minelike Targets IX

2004

Self Cite

“…The balun was designed to transition from a 50⍀ coaxial line to a 200⍀ resistive V-dipole [8]. Figure 1 illustrates the synthesized double-Y balun junction dimensions.…”

Section: Double-y Balun Designmentioning

confidence: 99%

“…The AUT and the LR unit were mounted on a rotary positioner, and the stationary receive probe (resistive V-dipole fed with a double-Y balun) was embedded in microwave absorber. The measurement system was automated using a PC running LabVIEW [8]. Figure 4(a) illustrates the resistively loaded V-dipole in [7] fed directly with a coaxial line (models an unbalanced feed).…”

Section: Experimental Setup: Optical Linkmentioning

confidence: 99%

Measured patterns of a resistive V‐dipole fed with a double‐Y balun

Venkatesan

Micro & Optical Tech Letters

2005

“…The 60‐cm‐long cable pair provide a time window of approximately 5.8ns in which no multiple reflections exist between the antenna and the balun. Figure 14b shows the results with double‐Y baluns with characteristic impedance Z 0 = 188 Ω, which are designed and analyzed by Venkatesan and Scott [2003].…”

Section: Performance Of the Realized Rvdmentioning

confidence: 99%

Design and realization of a discretely loaded resistive vee dipole for ground‐penetrating radars

Kim

2004

Radio Science

[1] A discretely loaded resistive vee dipole (RVD) is designed and realized for use in ground-penetrating radar (GPR) applications. The RVD is a good antenna for GPR applications because it can radiate a temporally short pulse into a small spot on the ground, and its low radar cross section mostly eliminates the multiple reflections between the surface of the ground and the antenna. The antenna presented in this paper is printed on a circuit board and is discretely loaded with off-the-shelf surface-mount chip resistors. The resulting structure is easy and inexpensive to manufacture and is mechanically stable. The realized antenna is measured in terms of the radiated field and the reflected voltage in the feeding transmission line. The results are compared with those of the antenna with the same resistive loading without substrate. The effects of the transmission line impedance on the performance of the antenna are also presented.