A Novel Method for Analyzing &amp; Predicting of Group Delay Variations in Wideband Transmission Lines

Eskandari, Ahmad Reza; Mohammady, L.; Eliasi, B.

doi:10.1109/rfit.2007.4443975

Cited by 2 publications

(4 citation statements)

References 5 publications

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“…In this analysis, C is swept on: C = 50, 100, 150, 200 pF, and according to (8) and (5), L is calculated. Afterwards using (6), R is obtained assuming Q = 5000. The parametric sweep and the design parameters are presented in Table 1 and accordingly the GD and amplitude response of the RLC equalizer are plotted in the Figure 2.…”

Section: Equalizer Designmentioning

confidence: 99%

“…In this step, The values of the L, C, GD-peak and Q e are constant and equal to 0.0021 nH, 100 pF, 20 ns and 344 000, respectively. While R is tuned and according to (6), the Q is also tuned proportional to R (Table 2). In this case, the GD and amplitude responses of the RLC equalizer are shown in Figure 4.…”

Section: Compensation Of the Amplitude Response Of The Filter Using T...mentioning

confidence: 99%

“…[1][2][3][4] In general a filter with high selectivity has large amplitude and GD variations, which result in distortion in digital data transmission. [5][6][7] The amplitude variations or rounded edges of the passband in the filter response due to limited Q factor of the resonators is inevitable. But this gets worse when the internal losses due to limited fabrication roughness add up to the other losses of the resonators and more rounded passband edges happen.…”

Section: Introductionmentioning

confidence: 99%

“…A typical IMUX comprises a number of narrowband filters with high selectivity and fractional bandwidth of 0.2%–2% 1–4 . In general a filter with high selectivity has large amplitude and GD variations, which result in distortion in digital data transmission 5–7 . The amplitude variations or rounded edges of the passband in the filter response due to limited Q factor of the resonators is inevitable.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

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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Section: Equalizer Designmentioning

confidence: 99%

Section: Compensation Of the Amplitude Response Of The Filter Using T...mentioning

confidence: 99%