T-junction high power microwave power combiner

This paper presents a high-power and sharp-skirt-selectivity bandpass filter with flexible transmission zero (TZ) and bandwidth. The proposed filter consists of three cascaded dual-mode resonant cavities and a bandstop resonant structure. The dualmode resonant cavity is composed of a substrate-integrated waveguide structure and a mushroom metal structure, which can implement a controllable bandwidth and generate a TZ for sharp skirt selectivity. Meanwhile, the middle dual-mode resonant cavity is an oversized waveguide structure to improve power capacity.

Section: Introductionmentioning

confidence: 99%

“…[16][17][18] Other ways also can improve the power capacity, such as vacuum pumping 19 and channel synthesis. 20,21 Nevertheless, it is complicated and expensive to realize the vacuum structures. Meanwhile, the channel synthesis will increase the complexity of the design.…”

Section: Introductionmentioning

confidence: 99%

A high‐power dual‐mode oversized substrate‐integrated waveguide (OS‐SIW) filter with flexible transmission zero (TZ) and bandwidth

Zheng

et al. 2023

“…[11][12][13] A novel power combiner applied to HPMs was proposed, which combined two overmoded rectangular waveguides. 11 The metal inserts inside the two waveguide structures are vertical to each other. A diplexer with the advantage of high power was designed using overmoded rectangular waveguides.…”

Section: Introductionmentioning

confidence: 99%

“…Additionally, overmoded waveguide structures are widely used to improve power capability, which are typically carried out by increasing the cross-section diameter and reducing the reverse field under the same power flow. [11][12][13] A novel power combiner applied to HPMs was proposed, which combined two overmoded rectangular waveguides. 11 The metal inserts inside the two waveguide structures are vertical to each other.…”

Section: Introductionmentioning

confidence: 99%

“…However, it is unsuitable for wide usage due to the difficulty and complexity of capacitive coupling irises design. Additionally, overmoded waveguide structures are widely used to improve power capability, which are typically carried out by increasing the cross‐section diameter and reducing the reverse field under the same power flow 11–13 . A novel power combiner applied to HPMs was proposed, which combined two overmoded rectangular waveguides 11 .…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A narrow‐band overmoded rectangular waveguide filter for high‐power microwaves (HPMs)

Zheng

et al. 2023

An overmoded rectangular waveguide filter with the advantages of narrowband and high power is presented in this paper. The transmission efficiency of each mode in the filter is analyzed based on mode-matching techniques and optimized by combining it with the calculation method. Due to the overmoded waveguide and direct coupling topology, the designed structure has characteristics of narrowband and high power. The overall size of the proposed filter is only 17.45 × 36.20 × 126.67 mm 3 (0.54λ 0 × 1.12λ 0 × 3.93λ 0 , λ 0 is the wavelength of the center frequency in free space). The test results match well with the simulated ones and they both show that the transmission efficiency of TE 10 mode is higher than 99.77%. Meanwhile, the proposed filter achieves 1% fractional bandwidth and 134.5 kW power capacity, which reveals that the filter has both narrow-band and high-power characteristics. The designed filter would be an attractive candidate for HPM systems.

A method to enhance the accuracy of radio frequency power measurements in particle accelerator high‐frequency systems

Fanjian,

Liepeng,

Longbo

et al. 2024

This letter presents a method for accurately calculating radio frequency (RF) power in a standing wave transmission line system. The proposed approach utilizes two directional couplers in conjunction with a low‐level radio frequency control system. RF power is determined through the application of proposed equations derived from amplitude and phase measurements of coupling signals obtained from the two directional couplers. Experimental validation of the method is conducted using two directional couplers with directivities of 26 and 28 dB, respectively, operating at 162.5 MHz across the entire wavelength. Results indicate that employing a single directional coupler yields average power errors of approximately 6.6% and 5.8%, respectively. However, by implementing the proposed method, the measurement error can be reduced to approximately 1.0%.