Design Strategy and Considerations to Improve Corona Discharge Breakdown in Groove Gap Waveguides

Morales-Hernández, Aitor; Ferrando-Rocher, Miguel; Sánchez-Soriano, Miguel Á.; Marini, Stephan; Boria, Vicente E.

doi:10.23919/eucap51087.2021.9411077

Cited by 6 publications

(8 citation statements)

References 9 publications

(8 reference statements)

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“…In Fig. 2, according to the same study and results presented in [16] and [42], the differences between the first propagation mode of a GGW and the counterpart RW can be observed, by means of the variation of the normalized electric field strength in the plane X-Y (| Êy |), whose values have also been obtained by using ANSYS HFSS. Note that The first plane is located in the middle of the air gap (i.e., y 1 = h p + h a /2, plotted by a solid blue line) and the second plane is placed in the middle of the pin's height (i.e., y 2 = h p /2, where a dotted red line and a dashed green line are used for the GGW and the RW designs, respectively).…”

Section: A Study Of the Te Ggw 10 -Like Mode And The Variation Of The...mentioning

confidence: 53%

“…In particular, the PPHC of GGWs has been hardly addressed in the literature, and just with simulated results [42]. Therefore, an in-depth analysis is carried out in this section to study the variation of the maximum electric field strength (which limits the peak power thresholds) in waveguides where the groove gap technology is used.…”

Section: Analysis Of Corona Discharge Breakdown In Groove Gap Waveguidesmentioning

confidence: 99%

“…Some other contributions have analyzed this same physical effect in planar devices [6], [38] and several design solutions have been proposed to enhance the PPHC [39], [40], [41]. With respect to previous research related to the corona discharge breakdown thresholds in GW technology, a preliminary study based on simulations for guided structures can be found in [42], where measured results are not presented. Moreover, a strategy for enhancing the PPHC in horizontally polarized BPFs has been proposed in [43], where a measured improvement of 8.7 dB in the high-pressure range has been demonstrated.…”

Section: Introductionmentioning

confidence: 99%

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In-Depth Study of the Corona Discharge Breakdown Thresholds in Groove Gap Waveguides and Enhancement Strategies for Inductive Bandpass Filters

et al. 2022

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This work focuses on the study of the corona discharge breakdown in groove gap waveguides (GGWs) and inductive bandpass filters (BPFs) based on this technology. With the main aim of improving the peak power handling capability (PPHC), the location of the maximum normalized electric field strength (| ÊMAX |) as a function of the geometrical parameters is analyzed. First, the research deals with wave-guiding structures, comparing the distribution of the transverse electric TE 10 -like mode of a GGW to that of an equivalent rectangular waveguide (RW). Next, a design strategy based on the adjustment of the geometrical dimensions of the bed of nails is proposed, thus achieving a considerable reduction of | ÊMAX |. The second part of this paper aims for vertically polarized GGW BPFs, where the inductive irises become the most critical part of the component. By a simple modification of their dimensions, a second design criterion is suggested for improving the PPHC. Finally, several Ku-band BPFs centered at 14 GHz and 16 GHz have been manufactured and experimentally verified at the European High-Power Radiofrequency Space Laboratory. This measurement campaign shows peak power thresholds up to 1.09 kW and 3.59 kW at 600 mbar for the non-and full-optimized GGW BPFs, respectively, thereby demonstrating a PPHC enhancement up to 5.16 dB in the high-pressure range when both strategies, proposed in this work, are used.INDEX TERMS Corona breakdown, gas discharge, groove gap waveguides, microwave bandpass filters, peak power handling capability (PPHC), power applications, voltage magnification.

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Section: A Study Of the Te Ggw 10 -Like Mode And The Variation Of The...mentioning

confidence: 53%

Section: Analysis Of Corona Discharge Breakdown In Groove Gap Waveguidesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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In-Depth Study of the Corona Discharge Breakdown Thresholds in Groove Gap Waveguides and Enhancement Strategies for Inductive Bandpass Filters

et al. 2022

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“…Analysis of the peak power handling capability (PPHC) due corona discharge effect is another important topic that will be briefly covered in the following. Due to the presence of a strong electric field in the free space above the bed of nails the PPHC of a GGWG can be much lower than that of a conventional waveguide with the same dimensions [18]. To avoid this issue, in this work, the dimensions and period of the bed of nails are selected such that the field above the bed of nails is much smaller than the maximum E 10 field inside the groove waveguide (See Fig 8(a)).…”

Section: B Validation Of the Proposed Phase Shiftermentioning

confidence: 99%

Low-Loss Mechanically Tunable Resonator and Phase Shifters in Groove Gap Waveguide Technology

2022

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This research is focused on the design and realization of high-performance high-power variable phase shifters in groove gap waveguide technology. Specifically, it is shown that the unique characteristic of groove gap waveguides, which is its proper operation without the need for electrical connection between the top and bottom sections of the waveguide, can be used to design mechanically tunable devices. Using the proposed method, a mechanically tunable cavity resonator and phase shifters with a wide range of achievable phase shifts are presented. To validate the concept, a phase shifter with 540 degrees relative phase shift at 15 GHz is designed, fabricated, and measured. Moreover, a multi-layer version of the proposed phase shifter with stationary feed ports and improved performance is presented.

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“…Therefore, if the signal peak power applied to the device is too high, an electrical discharge can take place in the surrounding air, which can lead to a degradation of the performance of the device or even to permanent damage of the component. In this way, some studies have predicted the gas breakdown effect in waveguide devices [5]- [8]. Furthermore, other investigations are focused on analyzing the corona breakdown effect in planar technology [9], [10] and also on proposing some design strategies to improve PPHC in microstrip bandpass filters (BPFs) [11]- [13].…”

mentioning

confidence: 99%

Peak Power Handling Capability in Groove Gap Waveguide Filters Based on Horizontally Polarized Resonators and Enhancement Solutions

Morales-Hernández

Sánchez-Soriano

Ferrando-Rocher

et al. 2022

IEEE Microw. Wireless Compon. Lett.

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This letter studies the peak power handling capability (PPHC) in groove gap waveguide filters based on horizontally polarized resonators. Moreover, a modification of the resonant cavity is proposed, where the central pins of the original structure are replaced by a rounded metal block. As a result of this change, the TE 101 -like mode can still be excited, but the maximum electric field strength is shifted to the center of the cavity, which leads to a higher PPHC. The main advantages of the original structure are maintained, and greater robustness in the manufacturing process is achieved. Next, some guidelines for the design of the coupling windows and the dimensions of the blocks are shown to minimize the electric field strength and, consequently, maximize the PPHC. Finally, two third-order bandpass filters (with pins and with blocks) centered at 16 GHz have been manufactured and tested in a measurement campaign, where a PPHC enhancement of 8.7 dB at high pressures is achieved for the novel solution presented in this work.

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Design Strategy and Considerations to Improve Corona Discharge Breakdown in Groove Gap Waveguides

Cited by 6 publications

References 9 publications

In-Depth Study of the Corona Discharge Breakdown Thresholds in Groove Gap Waveguides and Enhancement Strategies for Inductive Bandpass Filters

In-Depth Study of the Corona Discharge Breakdown Thresholds in Groove Gap Waveguides and Enhancement Strategies for Inductive Bandpass Filters

Low-Loss Mechanically Tunable Resonator and Phase Shifters in Groove Gap Waveguide Technology

Peak Power Handling Capability in Groove Gap Waveguide Filters Based on Horizontally Polarized Resonators and Enhancement Solutions

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