Coaxial Narrowband Filters Using a Versatile Suspended Resonator

Jaimes-Vera, Aline; Llamas-Garro, Ignacio; Corona‐Chávez, Alonso

doi:10.2528/pier11020402

Cited by 6 publications

(5 citation statements)

References 30 publications

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“…where S ext 21 (f i ) and S ext 11 (f i ) are the extracted S-parameters calculated by (6), and S mea 21 (f i ) and S mea 11 (f i ) are the measured (or simulated) S-parameters at the frequency point f i .…”

Section: Two-stage Optimization Methodsmentioning

confidence: 99%

“…With respect to the previous method available in [1], the new method has three advantages: 1) the CM extraction of the filter with source-load coupling has been taken into account; 2) unloaded Q for each resonator may be non-uniform; and 3) the new method has the higher accuracy and robustness. The method can guide the tuning of coupled resonator bandpass filters (as in [5][6][7]), dual-band resonator bandpass filters (as in [8][9][10]), and dual-mode bandpass filters (as in [11,12]), which are designed according to the CM, to accelerate filter design and a physical realization.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Improved Extraction of Coupling Matrix and Unloaded Q From S-Parameters of Lossy Resonator Filters

Wang¹,

Xu²,

Wei³

et al. 2011

PIER

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Abstract-This paper presents a two-stage optimization method for accurately extracting the coupling matrix (CM) and the unloaded quality factor (unloaded Q) of each resonator from the measured (or simulated) S-parameters of lossy cross-coupled resonator bandpass filters. The method can be used in computer-aided tuning (CAT) of microwave filters to accelerate filter design and physical realization. In our method, the Cauchy method is employed for determining characteristic polynomials of the S-parameters in the normalized lowpass frequency domain, and the CM and unloaded Q are extracted by two-stage optimization method using genetic algorithm. With respect to the previous methods available in the literatures, the proposed method allows the CM extraction of the filter with sourceload coupling. Moreover, the accuracy and robustness of the method can be improved due to the usage of the second stage optimization. The proposed method is applied to the diagnosis of a general coupled resonator filter with/without source-load coupling.

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Section: Two-stage Optimization Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Improved Extraction of Coupling Matrix and Unloaded Q From S-Parameters of Lossy Resonator Filters

Wang¹,

Xu²,

Wei³

et al. 2011

PIER

View full text Add to dashboard Cite

show abstract

“…In [5,6], Belyaev et al miniaturized SSS BPFs with high selectivity performance. Similar to SSS structure, a filter with a coaxial tube housing the suspended resonators was reported in [7]. Menzel et al [8][9][10][11] used a quasi-lumped approach to design some SSS filters and diplexers.…”

Section: Introductionmentioning

confidence: 99%

Suspended Substrate Stripline Bandpass Filters With Source-Load Coupling Structure Using Lumped and Full-Wave Mixed Approach

Ho¹,

Chen²

2012

PIER

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Abstract-This paper presents the design of two suspended substrate stripline (SSS) bandpass filters (BPFs), both with a source-load coupling structure embedded to create a transmission zero (TZ) near each side of the passband edges. For the first BPF, the physical circuit layout is proposed first and followed by the establishment of an equivalent LC circuit. The optimization of element values of the LC circuit using a circuit-level simulator leads to quick adjustment of the structural parameters of the physical circuit layout with the aid of a full-wave simulator. For the second BPF, the ingenious equivalent LC circuit modified from that of the first one is proposed for bandwidth enhancement, which is achieved by exciting two extra loaded resonances in the passband. With the element values of the LC circuit optimized, proper reshaping the physical circuit layout from that of the first BPF is easily accomplished. The presented lumped and full-wave mixed approach is very efficient in that the circuitlevel simulator is used to the largest extent and the time-consuming full-wave simulator is employed only at the later stage of the design. Experiments are conducted to verify the design of the two SSS BPFs and agreements are observed between the measured and simulated data.

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“…The proposed method is also suitable for the measured S 11 and S 21 with the different phase shift. This method will find many practical applications for the tuning of coupled resonator bandpass filters (as in [14][15][16][17][18]), dual-band resonator bandpass filters (as in [19][20][21][22]), and dual-mode bandpass filters (as in [23,24]), which are designed according to the coupling matrix. It is expected that the proposed CM extraction method can significantly accelerate the tuning of high-order cross-coupled resonator filters to obtain the required filter response and a physical realization.…”

Section: Introductionmentioning

confidence: 99%

Extracting Coupling Matrix and Unloaded Q From Scattering Parameters of Lossy Filters

Wang¹,

Xu²

2011

PIER

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Abstract-This paper presents a method for extracting the coupling matrix and the unloaded Q from the measured (or electromagnetic simulated) S-parameters of a narrow band cross-coupled resonator bandpass filter with losses. The Cauchy method is applied to determine the characteristic polynomials of the S-parameters of a filter in the normalized low-pass frequency domain. A five-parameter optimization method is proposed to obtain the unloaded Q and to remove the phase shift of the measured S-parameters, which is caused by the phase loading and the transmission lines at the input/output ports of a filter. Once the characteristic polynomials of the S-parameters with the phase shift removed have been determined, the coupling matrix of a filter with a given topology can be extracted using well established techniques. Two application examples are given to illustrate the validity of the proposed method.

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Coaxial Narrowband Filters Using a Versatile Suspended Resonator

Cited by 6 publications

References 30 publications

Improved Extraction of Coupling Matrix and Unloaded Q From S-Parameters of Lossy Resonator Filters

Improved Extraction of Coupling Matrix and Unloaded Q From S-Parameters of Lossy Resonator Filters

Suspended Substrate Stripline Bandpass Filters With Source-Load Coupling Structure Using Lumped and Full-Wave Mixed Approach

Extracting Coupling Matrix and Unloaded Q From Scattering Parameters of Lossy Filters

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