Advanced Coupling Matrix and Admittance Function Synthesis Techniques for Dissipative Microwave Filters

Miraftab, V.; Yu, Ming

doi:10.1109/tmtt.2009.2029625

Cited by 72 publications

(73 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The lossy coupling matrix M 2 is synthesized in Eq. (2) with the scaling factor k s = k l = 0.333 [6], and the coupling topology is given in Fig. 1(b).…”

Section: Analysis and Designmentioning

confidence: 99%

See 1 more Smart Citation

Flat-Passband Substrate Integrated Waveguide Filter With Resistive Couplings

Gao¹,

Mao³

2016

PIER C

View full text Add to dashboard Cite

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.

show abstract

“…The lossy coupling matrix M 2 is synthesized in Eq. (2) with the scaling factor k s = k l = 0.333 [6], and the coupling topology is given in Fig. 1(b).…”

Section: Analysis and Designmentioning

confidence: 99%

“…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

View full text Add to dashboard Cite

show abstract

“…This allows us to achieve a 50 n halfwave resonator with a Q of 200. By applying this Q into (9) we obtain an insertion loss of 3 dB which corresponds to k=0.7. Fig.…”

Section: Example: Filter Designmentioning

confidence: 99%

“…Development of synthesis techniques that take into account the limited Q of the filter resonators allows to optimize the filter selectivity and passband flatness, at the expense of other filter parameters (such as insertion loss) that might not be critical in channelizer filters. These techniques are usually known as lossy filter synthesis, and several works on these have been published in the recent years [1 ]- [9]. This paper outlines the synthesis procedure for the folded coupling network of a lossy filter and discusses issues related to insertion loss and Q in filters designed with such techniques.…”

Section: Introductionmentioning

confidence: 99%

“…Specifically, we illustrate how to derive the required resonator Q for a given filter insertion loss. This is illustrated for a simple 4th order lossy filter synthesized using a generalized technique to obtain the (N+2)x(N+2) transversal coupling matrix [9] and additional circuit transformation to obtain the final network topology. This procedure allows us to obtain a uniform Q distribution for a given synthesized response.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Synthesis of 4th order lossy filters with uniform Q distribution

Mateu

Padilla

Collado

et al. 2010

2010 IEEE MTT-S International Microwave Symposium

View full text Add to dashboard Cite

Computer-aided design of microstrip extracted-pole lossy filter

Zhou

Hong

2018

Int J RF Microw Comput Aided Eng

View full text Add to dashboard Cite

In this article, computer‐aided design of a new type of microstrip lossy filter is described. The new type of lossy filter is realized by introducing resistive cross couplings into a microstrip extracted‐pole filter to achieve a flat passband. The high selectivity is achieved by introducing 2 transmission zeros using 2 extracted poles, which can be adjusted. An equivalent circuit model is established and its circuit parameters, which are useful for physical implementation of the filter, are determined in light of computer modeling. For demonstration, two 6‐pole filters centered at 2 GHz with fractional bandwidth (FBW) 6% and 20% are implemented. Experimental results, together with a theoretical comparison between different FBWs, and full‐wave electromagnetic simulation results are also presented.

show abstract

Advanced Coupling Matrix and Admittance Function Synthesis Techniques for Dissipative Microwave Filters

Cited by 72 publications

References 8 publications

Flat-Passband Substrate Integrated Waveguide Filter With Resistive Couplings

Flat-Passband Substrate Integrated Waveguide Filter With Resistive Couplings

Synthesis of 4th order lossy filters with uniform Q distribution

Computer-aided design of microstrip extracted-pole lossy filter

Contact Info

Product

Resources

About