Generalized Lossy Microwave Filter Coupling Matrix Synthesis and Design Using Mixed Technologies

Miraftab, V.; Yu, Ming

doi:10.1109/tmtt.2008.2008267

Cited by 65 publications

(52 citation statements)

References 9 publications

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“…The cross coupling structure with chip resistor was adopted. The matrix synthesis approach with resistive coupling coefficients is developed in [5,6]. By attenuating both the transmission and reflection coefficients of an ideal lossless filter, a lossy coupling matrix can be synthesized.…”

Section: Introductionmentioning

confidence: 99%

Flat-Passband Substrate Integrated Waveguide Filter With Resistive Couplings

Gao¹,

Mao³

2016

PIER C

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Abstract-A lossy filter with resistive coupling is proposed based on substrate integrated waveguide (SIW) resonators, where nonresonating nodes are not required to simplify the realization. The sensitivity analysis of S-parameter to the resistive coupling coefficient is carried out to determine the parameters of coupling structure and mounted resistors. When resistive couplings are added to the structure, the measured 0.2-dB passband bandwidth increases from 198 to 256 MHz, compared with the case without resistive couplings. At a sacrifice on the additional insertion loss of 1.1 dB, the passband flatness and selectivity are improved significantly. The lossy SIW filter can provide a smaller in-band insertion loss than the microstrip counterparts, because the unloaded Q-factor of SIW resonators is higher than that of microstrip resonators. Moreover, a simpler topology and a less insertion loss are obtained in the proposed resistively coupled SIW filter than those of the lossy filter synthesized with lossy coupling matrix. Excellent agreement between the simulated and measured results is achieved to demonstrate our idea.

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Section: Introductionmentioning

confidence: 99%

Flat-Passband Substrate Integrated Waveguide Filter With Resistive Couplings

Gao¹,

Mao³

2016

PIER C

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“…In [7], a design method is proposed for symmetric filter configuration, based on the even-/oddmode analysis. More generalized synthesis method is established with a specific lossy coupling matrix [8], [9], which includes lossy resonators and complex direct and cross coupling coefficients. Since the in-band flatness and band-edge sharpness of filters are achieved by absorbing power rather than reflection, the lossy matrix synthesis technique provides better return loss than the predistortion method.…”

Section: Introductionmentioning

confidence: 99%

A hybrid method for flat-passband filter with nonuniform Q resonators and predistortion

Qiu

Wang

2014

2014 IEEE International Wireless Symposium (IWS 2014)

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A new synthesis method is proposed for the design of high-performance parallel connected lossy filters. Compared with the nonuniform Q method, where the Q distribution is determined by the sensitivities of a preset coupling matrix, our method can provide a flat passband with flexible combination of nonuniform Q resonators by utilizing the predistortion technique with an adaptive offset. Two generalized Chebyshev filters with different specific Qfactors are designed with the negative and positive distortion offsets. The proposed hybrid method has been validated by the perfect passband flatness achieved with both of them.

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“…In order to include losses in the filter design procedure, lossy synthesis techniques have been introduced and several investigations have been conducted on them [2][3][4][5][6][7]. Lossy synthesis techniques enable filters with low-Q resonators to have ideal pass-band flatness at the expense of an additional absolute insertion loss which in most cases can be compensated by an amplifier without affecting the performance of the whole system [3].…”

Section: Introductionmentioning

confidence: 99%