A Simple and General Method for Filtering Power Divider With Frequency-Fixed and Frequency-Tunable Fully Canonical Filtering-Response Demonstrations

Lu, Di; Yu, Ming; Barker, N. Scott; Li, Mei; Tang, Shiwen

doi:10.1109/tmtt.2019.2903504

Cited by 23 publications

(7 citation statements)

References 50 publications

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“…We can find that R iso of proposed FPD is related to operation bandwidth FBW a , filter order N , in-band ripple L Ar , power-division ratio k 2 , resonator impedance Z r1a , and resonator type (λ/2 or λ/4 resonator), but not correlated to terminated impedances of input and output. This conclusion is different to other reported formulas for R iso , such as R iso = Z L (k+ 1/k) in [32], and R iso = R S (1 + k 2 ) 2 /k 2 in [33].…”

Section: Isolationcontrasting

confidence: 99%

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A New Design of Filtering Power Dividers With Arbitrary Constant Phase Difference, Impedance Transformation, and Good Isolation

Lyu

Cheng

2019

IEEE Access

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This paper proposes a new class of filtering power dividers integrated with phase shifter and impedance transformer simultaneously for the first time. In contrast to the conventional approaches, the proposed filtering power dividers consist of two asymmetrical generalized bandpass networks, that can achieve arbitrary constant phase difference and good isolation at two output ports. On the one hand, the magnitude and phase properties of two generalized n th -order bandpass networks are systematically studied and fully considered to realize the prescribed power division, filtering function, constant phase difference, and impedance transformation in the co-design. On the other hand, in order to obtain good isolation, the resonator's type and impedance of these two asymmetrical networks are carefully considered and closed-form formula of isolation resistor is also deduced. Theoretical results show that the proposed topology can achieve perfect isolation over entire passband for the arbitrary phase difference. Meanwhile, the synthesis procedures are presented for a quick design process. Finally, two porotypes (90 • power divider and 120 • power divider) with specified different operation bandwidth (15% and 25%), filter order (3rd and 6th), and terminated port impedances (50 and 100 ) are synthesized, fabricated, and tested to verify the proposed design method and predicted frequency responses. It firstly integrates the power divider, filter, phase shifter, and impedance transformer into single component and has several additional advantages, such as low cost, simple geometry, small phase deviation and amplitude imbalance, and easiness for design and fabrication.INDEX TERMS Filtering power divider, arbitrary constant phase difference, good isolation, asymmetrical networks, synthesis design.

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Section: Isolationcontrasting

confidence: 99%

“…where c is the light velocity and ε re is effective dielectric constant. Thirdly, coupling coefficients and external quality factor can be determined by (33) can be extracted by using the approach in [35] and relevant results are depicted in Fig. 18.…”

Section: Synthesis Of Sixth-order 120 • Filtering Power Divider (Fpd) On λ/4 Resonatorsmentioning

confidence: 99%

A New Design of Filtering Power Dividers With Arbitrary Constant Phase Difference, Impedance Transformation, and Good Isolation

Lyu

Cheng

2019

IEEE Access

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“…On the other hand, by calculating the theoretical S ‐parameters S 21 and S 31 from [12], the PDRs can be derived as,

(][, \begin{matrix} 1em4pt \\ A & B \\ C & D \end{matrix}) = (][, \begin{matrix} 1em4pt \\ A_{1} & B_{1} \\ C_{1} & D_{1} \end{matrix}) (][, \begin{matrix} 1em4pt \\ 1 & 1 / j ω C_{31} \\ 0 & 1 \end{matrix}) (][, \begin{matrix} 1em4pt \\ A_{2} & B_{2} \\ C_{2} & D_{2} \end{matrix})

S_{21} = \frac{S_{21 e}}{\sqrt{2}} = \frac{1}{\sqrt{2}} \cdot \frac{4 Z_{0}}{4 A Z_{0} + B + 4 C Z_{0}^{2} + D Z_{0}}

PDR = {(||, S_{21})}^{2} / {(||, S_{31})}^{2} / {(||, S_{41})}^{2} / {(||, S_{51})}^{2} = f ()(, C_{31}, C_{32}, C_{33}, C_{34})

where A 1 , B 1 , C 1 and D 1 are the elements of the ABCD matrix between node a and node b while A 2 , B 2 , C 2 and D 2 are the elements of the ABCD matrix between node c and node d . Similarly, it can be obtained that the frequency response S i 1 ( i = 3, 4, 5) is the function of C 3 i ( i = 2, 3, 4), can be obtained.…”

Section: Design and Analysismentioning

confidence: 99%

“…On the other hand, by calculating the theoretical S-parameters S 21 and S 31 from [12], the PDRs can be derived as,…”

mentioning

confidence: 99%

Miniaturised wide tuning‐range four‐way quasi‐lumped‐element filtering power divider

et al. 2020

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This Letter presents a miniaturised wide tuning-range four-way filtering power divider (FPD). It is mainly developed by integrating a co-shared varactor-loaded quasi-lumped-element dual-mode resonator and an isolation resistor, achieving a wide tuning power division ratio (PDR) and centre frequency (CF) simultaneously. The presented tunable fourway FPD stands out from those in the literature, by both its improved performance (wider tuning range for PDR and CF with nice isolation and matching) and ultra-compact design layout. To validate the design concept, a reconfigurable prototype is designed, fabricated, and tested. Measured results will coincide with the simulated ones.

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“…In [3], three defect ground structures (DGSs) were used for each filtering channel to realise a wide stopband. Besides bandstop structures, the cross‐coupling can also be used to generate transmission zeroes [4]. For the reported filtering devices, the above‐mentioned methods are most commonly used for improving the stopband property.…”

Section: Introductionmentioning

confidence: 99%

Compact filtering power divider with extended stopband using out‐of‐phase feeding scheme

2019

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A compact filtering power divider is proposed with very wide stopband suppression in this letter. First, the dual-composite right-and lefthanded (D-CRLH) resonator is employed, while one extended stopband can thus be achieved due to its inherently slow-wave response. Secondly, one out-of-phase feeding scheme is introduced to realise D-CRLH filtering power divider. By putting the input and output ports on the different sides of D-CRLH resonators, the mismatching can be realised for the harmonics below 10 GHz and wide stopband suppression is obtained accordingly. For experimental verification, a compact filtering power divider is designed, fabricated, and measured. Wide stopband suppression is observed until 5f 0 without using bandstop structures or complex coupling topology.

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A Simple and General Method for Filtering Power Divider With Frequency-Fixed and Frequency-Tunable Fully Canonical Filtering-Response Demonstrations

Cited by 23 publications

References 50 publications

A New Design of Filtering Power Dividers With Arbitrary Constant Phase Difference, Impedance Transformation, and Good Isolation

A New Design of Filtering Power Dividers With Arbitrary Constant Phase Difference, Impedance Transformation, and Good Isolation

Miniaturised wide tuning‐range four‐way quasi‐lumped‐element filtering power divider

Compact filtering power divider with extended stopband using out‐of‐phase feeding scheme

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