Compact and Narrow-Band Waveguide Filters Using TM Dual-Mode Cavities for Input Multiplexer in Communication Satellites

Eskandari, Ahmad Reza; Kheirdoost, Ali

doi:10.1109/ist50524.2020.9345871

Cited by 3 publications

(2 citation statements)

References 21 publications

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“…Coupling screws are usually used in the cavity at opposite corners to realize coupling between degenerated modes, while the input coupling between input waveguides and associated resonator are realized by rectangular iris. This configuration can produce two poles with larger bandwidth compared to the single‐mode equalizer 31–34 . The resonance frequency of TM 110 mode in the cylindrical cavity with radius r is given by 27 :

{((), f)}_{TM {normalE}_{110}} = \frac{C}{2 π} \frac{χ_{11}}{r}

where 𝜒 11 represents the first zero of the Bessel function J 1 of the first kind of order 1 (𝜒 11 = 3.8318).…”

Section: Design Of the Dual‐mode Waveguide Equalizermentioning

confidence: 99%

Simultaneous flattening of amplitude and group delay responses in narrowband bandpass filters using a novel systematic design method

Eskandari

Kheirdoost

2022

Int J RF Mic Comp-Aid Eng

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In this article, a novel systematic method for compensation of the simultaneous amplitude and group delay (GD) flatness in the narrowband bandpass filters is proposed. The proposed technique can be used systematically in any type of filters with the possibility of resonator quality factor adjustment. This technique is presented using an RLC resonator equalizer in two steps. First, the compensation of the GD response is accomplished by tuning the external Q-factor, then the amplitude response is compensated by adjusting the resonator Q-factor. To verify this technique, design and fabrication of a TM dualmode equalizer for joint compensation of the amplitude and GD responses in a narrowband waveguide filter is presented. The simulation results for a novel TE dual mode equalizer is also presented. The passband response of an unequalized narrowband filter with passband flatness of 1.5 dB amplitude and 55 ns GD at the center frequency of 10.970 GHz is improved to 0.5 dB amplitude flatness and 30 ns GD flatness. This improvement is achieved at the cost of passband insertion loss. The designed equalizer is fabricated and tested and the measurement results, after and before equalization, prove the design technique capability.

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{((), f)}_{TM {normalE}_{110}} = \frac{C}{2 π} \frac{χ_{11}}{r}

where 𝜒 11 represents the first zero of the Bessel function J 1 of the first kind of order 1 (𝜒 11 = 3.8318).…”

Section: Design Of the Dual‐mode Waveguide Equalizermentioning

confidence: 99%

Simultaneous flattening of amplitude and group delay responses in narrowband bandpass filters using a novel systematic design method

Eskandari

Kheirdoost

2022

Int J RF Mic Comp-Aid Eng

Self Cite

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“…Waveguide filters have high power, low insertion loss, and high Q-value characteristics, which are especially suitable for narrow-band applications. The cascaded structure of standard waveguide resonators [1][2][3][4] or coupling between modes in a multimode cavity [5][6][7][8][9] are commonly used to achieve narrowband characteristics in waveguide filters. Nevertheless, the high power requirement is hardly considered in the above structures.…”

Section: Introductionmentioning

confidence: 99%

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

Zheng

et al. 2023

Micro & Optical Tech Letters

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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.

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Compact Bandpass Waveguide Filters with Capacitive or Mixed Couplings with E-plane Symmetry and without E-plane Symmetry

Sorkin

2022

2022 International Siberian Conference on Control and Communications (SIBCON)

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Compact and Narrow-Band Waveguide Filters Using TM Dual-Mode Cavities for Input Multiplexer in Communication Satellites

Cited by 3 publications

References 21 publications

Simultaneous flattening of amplitude and group delay responses in narrowband bandpass filters using a novel systematic design method

Simultaneous flattening of amplitude and group delay responses in narrowband bandpass filters using a novel systematic design method

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

Compact Bandpass Waveguide Filters with Capacitive or Mixed Couplings with E-plane Symmetry and without E-plane Symmetry

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