A General Synthesis Approach of Coupling Matrix With Arbitrary Reference Impedances

Ge, Chuan; Zhu, Xiao‐Wei; Jiang, Xin; Xu, Xin

doi:10.1109/lmwc.2015.2421327

Cited by 14 publications

(11 citation statements)

References 11 publications

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“…Based on the equivalent circuit model of the microwave filter and the complex impedance match filtering theory, we can get a new impedance matched filter circuit model based on K converter, and a new coupling matrix can be derived. Figure shows the impedance matched filter circuit model based on K converters.…”

Section: Equivalent Circuit Modeling Of Filtering Antenna System For mentioning

confidence: 99%

Filtering antennas for energy harvesting in wearable systems

Dong

Gao

Luo

et al. 2019

Int J Numerical Modelling

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Wearable systems are important for future smart home care for the disabled and ageing population. One of the key challenges is the power supply. One solution is to develop an energy harvesting system suitable for providing power wirelessly. The matching network and filter in traditional energy harvesting system occupy lots of space, introduce additional losses, and reduce the total efficiency. This paper presents a novel filtering antenna suitable for wearable energy harvesting systems. The developed antenna has a broadband operation, harmonics suppression, compact size, and low cost. Firstly, a novel technique for broadband filtering antenna modeling and design in order to realize complex input impedance is presented. By adjusting the external quality factors and coupling coefficients of the resonators, complex impedance matching can be realized. Then, the theory of characteristic mode is used for the modal analysis of the filtering antenna. To verify the design concept, a C‐band circularly polarized filtering antenna with complex impedance is designed and fabricated. The results show that the impedance bandwidth is more than 14.5% with a peak gain higher than 8.5 dBi. The proposed antenna is conjugate matched to the rectifying circuit at 5.8 GHz and mismatched at the second harmonic frequency to suppress the harmonic reradiation, leading to a compact rectenna structure.

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Section: Equivalent Circuit Modeling Of Filtering Antenna System For mentioning

confidence: 99%

Filtering antennas for energy harvesting in wearable systems

Dong

Gao

Luo

et al. 2019

Int J Numerical Modelling

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show abstract

“…During past few decades, a big attention has been paid to the direct synthesis of microwave filters [1][2][3][4][5][6][7][8]. Among them, a matrix-based approach, which is recommended by Cameron in [3,4], is widely applied due to its simplicity.…”

Section: Introductionmentioning

confidence: 99%

“…Among them, a matrix-based approach, which is recommended by Cameron in [3,4], is widely applied due to its simplicity. The theory has then been developed by many other researchers in recent years to increase its adaptability, such as direct synthesis of dissipative/lossy filters [5,6] and filters terminated with complex loads in [7,8].…”

Section: Introductionmentioning

confidence: 99%

Generalised direct matrix synthesis approach for lossless filters

Wang

Sun

et al. 2017

IET Microwaves, Antennas & Propagation

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A generalised direct matrix synthesis is proposed for microwave lossless filters with arbitrary phase shift at centre frequency and complex terminal impedances. The functions of traditional lossless filters, ideal phase shifters, and ideal impedance matching networks are thus substantially combined into one entity to provide an attractive technique for the realisation of compact narrowband microwave front‐ends. The synthesis starts with a group of general S‐parameters that consider both amplitude and phase responses as well as complex terminations for an Nth‐order filter. A transversal array network incorporating resonators as well as non‐resonating nodes is then introduced to accommodate the given S‐parameters. In result, a canonical (N + 2) × (N + 2) coupling matrix with newly defined source–source and load–load couplings is generated. Some examples, including a fully canonical prototype and a mixed topology diplexer, are demonstrated to show the flexibility of the methodology. Moreover, an eighth‐order coaxial cavity filter, with a −120° additional phase shift for S‐parameters, is designed and fabricated. The measured results are well consistent with the synthesis ones, which validates the availability of this study in physical implementations.

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“…Recently, the synthesis of filters with complex loads was presented for the design of diplexers, which is also very useful for the design of the matching networks of antennas or active circuits . By converting the scattering matrix into the admittance matrix, the filters with both the complex source and load impedances were investigated for the single‐band application . And a dual band filter was synthesized by connecting two channel filters with complex impedances in parallel .…”

Section: Introductionmentioning

confidence: 99%

“…26,27 By converting the scattering matrix into the admittance matrix, the filters with both the complex source and load impedances were investigated for the single-band application. 28 And a dual band filter was synthesized by connecting two channel filters with complex impedances in parallel. 29 In this work, a general synthesis of microwave filters terminated by complex source and load impedances is newly proposed for the dual-band application.…”

Section: Introductionmentioning

confidence: 99%

Computer aided design for dual-band filters with complex source and load impedances

Sun

2017

Int J RF Microw Comput Aided Eng

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This article presents a computer aided technique to synthesize the filtering function for dual‐band microwave filters with complex source and load impedances. Based on the exchange‐Remez algorithm and the power wave renormalization theory, the characteristic function is first obtained with assigned ripple level at the first passband. Two additional transmission zeros are then optimally allocated to control the ripple level at the second passband. By directly modifying the coupling matrix elements in the first and last stages, a simplified method is also presented when the loading impedance is frequency‐independent. Three synthesized examples with both controlled in‐band and out‐of‐band responses are presented. Finally, LC multi‐coupled circuits are also provided to validate the effectiveness of the proposed method.

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A General Synthesis Approach of Coupling Matrix With Arbitrary Reference Impedances

Cited by 14 publications

References 11 publications

Filtering antennas for energy harvesting in wearable systems

Filtering antennas for energy harvesting in wearable systems

Generalised direct matrix synthesis approach for lossless filters

Computer aided design for dual-band filters with complex source and load impedances

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