scholarly journals Array Synthesis Horn Antenna with an Extended Horn and a Stepped Corrugated Structure for High-Power Microwave Applications

2020 ◽  
Vol 20 (2) ◽  
pp. 110-114
Author(s):  
Yoon-Seon Choi ◽  
Ji-Hun Hong ◽  
Jong-Myung Woo
Keyword(s):  
High Power ◽  
Horn Antenna ◽  
High Gain ◽  
Horn Antennas ◽  
High Power Microwave ◽  
Microwave System ◽  
Pyramidal Horn ◽  
Microwave Applications ◽  
Corrugated Structure ◽  
Power Microwave

This study proposes an array synthesis horn antenna with an extended horn and a stepped corrugated structure for a high-power microwave system. The horn antenna is designed by joining four pyramidal horn antennas and an extended horn to obtain a high gain. To improve the beam pattern in the H-plane, the length of the vertical junction of the pyramidal horns is controlled. Two-stepped and partitioned corrugated structures are attached to both horizontal edges of the aperture for a good front-to-back ratio. The designed 2 × 2 array synthesis horn antenna has a gain of 19.7 dBi and front-to-back ratio of 39.6 dB in the measurement.

scholarly journals Artefact and ablation performance of an MR-conditional high-power microwave system in bovine livers: an ex vivo study

2019 ◽  
Vol 3 (1) ◽  
Author(s):  
Antonia Grimm ◽  
Moritz Winkelmann ◽  
Jakob Weiß ◽  
Georg Gohla ◽  
Gunnar Blumenstock ◽  
...  
Keyword(s):  
High Power ◽  
Ex Vivo ◽  
Spin Echo ◽  
Breath Hold ◽  
High Power Microwave ◽  
Mr Conditional ◽  
Slice Orientation ◽  
Microwave System ◽  
Post Hoc ◽  
Power Microwave

Abstract Background We evaluated a magnetic resonance (MR)-conditional high-power microwave ablation system. Methods An exvivo 1.5-T evaluation was conducted by varying the sequence (T1-weighted volume interpolated breath-hold examination, T1w-VIBE; T1-weighted fast low-angle shot, T1w-FLASH; T2-weighted turbo spin-echo, T2w-TSE), applicator angulation to B0 (A-to-B0), slice orientation, and encoding direction. Tip location error (TLE) and artefact diameters were measured, and influence of imaging parameters was assessed with analysis of variance and post hoc testing. Twenty-four exvivo ablations were conducted in three bovine livers at 80 W and 120 W. Ablation durations were 5, 10, and 15 min. Ablation zones were compared for short-axis diameter (SAD), volume, and sphericity index (SI) with unpaired t test. Results The artefact pattern was similar for all sequences. The shaft artefact (4.4 ± 2.9 mm, mean ± standard deviation) was dependent on the sequence (p = 0.012) and the A-to-B0 (p < 0.001); the largest shaft diameter was measured with T1w-FLASH (6.3 ± 3.4 mm) and with perpendicular A-to-B0 (6.7 ± 2.4 mm). The tip artefact (1.6 ± 0.7 mm) was dependent on A-to-B0 (p = 0.001); TLE was -2.6 ± 1.0 mm. Ablation results at the maximum setting (15 min, 120 W) were SAD = 42.0 ± 1.41 mm; volume = 56.78 ± 3.08 cm3, SI = 0.68 ± 0.05. In all ablations, SI ranged 0.68–0.75 with the smallest SI at 15 min and 120 W (p = 0.048). Conclusion The system produced sufficiently large ablation zones and the artefact was appropriate for MR-guided interventions.

Metamaterial-enabled Reflectarray Antennas for High-power Microwave Applications

2020 ◽  
Author(s):  
Sawyer D. Campbell ◽  
Galestan Mackertich-Sengerdy ◽  
J. Daniel Binion ◽  
Ryan J. Chaky ◽  
Ronald P. Jenkins ◽  
...  
Keyword(s):  
High Power ◽  
High Power Microwave ◽  
Microwave Applications ◽  
Power Microwave

scholarly journals Study of an Ultra-Compact, Repetitive Marx Generator for High-Power Microwave Applications

2009 ◽  
Vol 115 (6) ◽  
pp. 964-966 ◽  
Author(s):  
R. Bischoff ◽  
R. Charon ◽  
J.P. Duperoux ◽  
B. Martin ◽  
S. Pinguet
Keyword(s):  
High Power ◽  
Marx Generator ◽  
High Power Microwave ◽  
Microwave Applications ◽  
Power Microwave
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