Aperture-Coupling Effect of Two-Layered Open-Loop Microstrip Bandpass Filters Designed by the Cul-de-Sac Coupling Matrix

Yamamura, Kazuki; Deguchi, Hiroyuki; Tsuji, Mikio

doi:10.1109/iceaa.2019.8879047

Cited by 2 publications

(2 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…where 𝜔 is the complex frequency parameter 𝑠 = 𝑗𝜔, and 𝐹 (𝜔), 𝐸 (𝜔) are the 𝑁 -order filter polynomials of the chained functions [21]. The polynomials 𝐸 , 𝐹 are applied to derive the even/odd-mode polynomials [22]. The parameters for short-circuit admittance 𝑦 , 𝑦 can be derived from (29), and 𝑁 which represents the even/odd mode.…”

Section: Parallel Chained Filter Coupling Matrix Synthesismentioning

confidence: 99%

“…where 𝜆 represent the pole for eigenvalue, and 𝑇 and 𝑇 are the respective orthogonal first and last rows of the matrix T. The orthogonal rows can be generated by using the Gram-Schmidt orthogonalization technique [21]. Similarity transformation and matrix element annihilation are performed and the complete coupling matrix M is obtained [22,23]. To synthesize the coupling matrix of two pole parallel networks, the matrix is divided into subnetworks and a series of configurations are carried out for the entire matrix until the right coupling is achieved [14].…”

Section: Parallel Chained Filter Coupling Matrix Synthesismentioning

confidence: 99%

See 1 more Smart Citation

Design of Compact Parallel-Connected Chained Function Filters

Chinda,

Seoung,

Cheab

et al. 2023

J. Electromagn. Eng. Sci

View full text Add to dashboard Cite

The design of compact parallel-connected chained function filters is presented in this paper. The proposed filters will offer reduced sensitivity to manufacturing tolerance within the specified bandwidth in comparison to conventional Chebyshev filters for C-band applications. A new filtering function according to a chained configuration is derived for fourth-order filters, and the synthesis procedures are presented. To demonstrate the feasibility of this approach, the circuit simulation based on parallel-connected topology is performed in an advanced design system, while the design and simulation of a fourth-order filter in dielectric technology are carried out in high-frequency simulation software. The prototype of fourth-order microstrip topology is fabricated using open-loop resonators. The overall circuit size of the filter is 2.5 cm × 4 cm. The achieved simulation and measured insertion/return loss are 0.409 dB/20 dB and 2.674 dB/18.074 dB, respectively. Extensive sensitivity analysis is conducted to prove the fabrication tolerance of the filter. The reduced sensitivity of the proposed filter to manufacturing tolerance is fully demonstrated using an open-loop microstrip technology, and its reliability is proven by theoretical analysis. The prototype results in this research are validated and agree with the theoretical results. In terms of implementation, this design technique will be a very useful mathematical tool for any filter design engineer.

show abstract

Section: Parallel Chained Filter Coupling Matrix Synthesismentioning

confidence: 99%