A New Compact High-Power Microwave Phase Shifter

Chang, Chao; Guo, Letian; Tantawi, Sami; Liu, Yansheng; Li, Jiawei; Chen, Changhua; Huang, Wenzhu

doi:10.1109/tmtt.2015.2423281

Cited by 35 publications

(11 citation statements)

References 26 publications

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“…The 3 dB coupler without matching pins has less possibility of RF break down compared to the dual circular polarizer [17]. In addition, the structure is simpler than the dual-mode circular polarizer [8,20,21], which is easier for fabrication.…”

Section: Simulation Resultsmentioning

confidence: 99%

RF design of an S-band spherical cavity pulse compressor

Hou

Shu

et al. 2017

Radiat Detect Technol Methods

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The pulse compressor plays an important role in accelerators by enhancing the RF peak power. An S-band (2856 MHz) spherical cavity pulse compressor consisting of a special 3 dB coupler and a single spherical energy storage cavity has been developed in Institute of High Energy Physics. The special 3 dB coupler converts the TE 10 mode in rectangular waveguide to two polarization degenerated TE 11 modes in cylindrical waveguide. It is also a circular polarizer and its general scattering matrix is given for the first time. The magnitude and the phase difference of the two TE 11 modes are −3.016, −3.005 dB and 90.02 • in HFSS, while it is −3.01, −3.01 dB and 89.79 • in CST. The simulated S parameters show agreement with the general scattering matrix. The TE 114 mode with an unloaded Q factor of 190,000 has been chosen to resonate in the spherical cavity. An energy multiplication factor of 1.75 and a peak power gain of 5.75 were obtained for the whole pulse compressor, which agrees with the design requirements. A good pulse compression performance is also proved by the CST time-domain simulation. In addition, the scheme for tuning and detuning is designed and given in detail. Compared to the traditional SLED type, the spherical cavity pulse compressor uses only one spherical cavity to real-

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Section: Simulation Resultsmentioning

confidence: 99%

RF design of an S-band spherical cavity pulse compressor

Hou

Shu

et al. 2017

Radiat Detect Technol Methods

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“…(13) is established, and we can get the scattering matrix of M1 the same as Eqs. (17) or (18). So the first prototype M1 is a dual circular polarizer.…”

Section: Cold Test Of the Dual Circular Polarizermentioning

confidence: 99%

“…The general scattering matrix is suitable for the usual 3-dB coupler (with four rectangular waveguide ports) as well as the left-/right-hand circular polarizer. In addition to the pulse compressor application, if a movable metal shorted plug is inserted into the cylindrical waveguide (Port 3), the dual circular polarizer will become a phase shifter [18], which means the wave coming from Port 1 will propagate to Port 2 with a variable phase shifting corresponding to the different positions of the shorted plug. It is worth emphasizing that the S-band dual circular polarizer can be scaled to other frequency bands and will have more application prospects.…”

Section: Introductionmentioning

confidence: 99%

Design and cold test of an S-band waveguide dual circular polarizer

Pei

Hou

et al. 2017

Radiat Detect Technol Methods

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Purpose An S-band dual circular polarizer has been designed and tested with low power in the paper, which will be applied in a spherical cavity pulse compressor. It converts the TE 10 mode in rectangular waveguide into two polarization degenerated TE 11 modes in cylindrical waveguide. Methods The general scattering matrix of the dual circular polarizer has been deduced based on the properties of the passive microwave network, which is suitable for the usual 3 dB coupler, as well as the left/right hand circular polarizer. Based on the 3D code software CST, the dual circular polarizer was numerically simulated. Then, two prototypes have been manufactured and tested with the vector network analyzer (VNA). Results The simulation results show that the magnitudes and phase difference of the two TE 11 modes are − 3.0103/− 3.0104 dB and 89.79 degrees, respectively. The cold test results show good agreement with CST simulation. Conclusion The method of analyzing the relationship between the voltage standing wave ratio (VSWR) and the errors of the magnitudes and phase difference of the two TE 11 modes was given, which can be used to qualitatively analyze the properties of the circular polarizer. The S-band waveguide dual circular polarizer can be applied in the pulse compressor, phase shifter or other frequency bands.

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“…Radio frequency polarizers are a highly versatile class of devices that can be utilized in a number of applications including phase-shifters, duplexer's, loads, and hybrid couplers [8,9]. Existing embodiments of the polarizer, however, require the use of complicated structures such as irises, septums, or corrugations, in order to properly excite the circularly polarized output signal [9][10][11]. These features can increase electromagnetic fields and thus significantly reduce the devices power handling capabilities due to heating and breakdown.…”

Section: Introductionmentioning

confidence: 99%

Compact rf polarizer and its application to pulse compression systems

Franzi

Wang

Dolgashev

et al. 2016

Phys. Rev. Accel. Beams

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We present a novel method of reducing the footprint and increasing the efficiency of the modern multi-MW rf pulse compressor. This system utilizes a high power rf polarizer to couple two circular waveguide modes in quadrature to a single resonant cavity in order to replicate the response of a traditional two cavity configuration using a 4-port hybrid. The 11.424 GHz, high-Q, spherical cavity has a 5.875 cm radius and is fed by the circularly polarized signal to simultaneously excite the degenerate TE 114 modes. The overcoupled spherical cavity has a Q 0 of 9.4 × 10 4 and coupling factor (β) of 7.69 thus providing a loaded quality factor Q L of 1.06 × 10 4 with a fill time of 150 ns. Cold tests of the polarizer demonstrated good agreement with the numerical design, showing transmission of −0.05 dB and reflection back to the input rectangular WR 90 waveguide less than −40 dB over a 100 MHz bandwidth. This novel rf pulse compressor was tested at SLAC using XL-4 Klystron that provided rf power up to 32 MW and generated peak output power of 205 MW and an average of 135 MW over the discharged signal. A general network analysis of the polarizer is discussed as well as the design and high power test of the rf pulse compressor.

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A New Compact High-Power Microwave Phase Shifter

Cited by 35 publications

References 26 publications

RF design of an S-band spherical cavity pulse compressor

RF design of an S-band spherical cavity pulse compressor

Design and cold test of an S-band waveguide dual circular polarizer

Compact rf polarizer and its application to pulse compression systems

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