A Novel Frequency-Dependent Coupling With Flexibly Controllable Slope and Its Applications on Substrate-Integrated Waveguide Filters

Liu, Qing; Zhou, Donghua; Zhang, Dewei; Lv, Dalong

doi:10.1109/lmwc.2018.2872325

Cited by 28 publications

(17 citation statements)

References 12 publications

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“…Both electric and magnetic coupling exist in the proposed coupling structure. The coupling through the open window is mainly dominated by magnetic coupling in nature [30] while the coupling from the coupling capacitator C c mainly contributed to the electric coupling [31]. Fig.…”

Section: ) Fourth-order Filtering Modementioning

confidence: 99%

“…Assuming the characteristic admittance of the J-invertor is J c , the coupling coefficient k c between the coupled resonators can be calculated from the low-pass prototype filter as, where FBW is the fractional bandwidth, g 1 and g 2 are element value in the corresponding low-pass prototype filter, ω 0 is the angular resonant frequency, C is the capacitance of the L-C resonant tank. The mapping of the coupling coefficients between the proposed filter coupler and the conventional coupled resonators can be approximately obtained as [30],…”

Section: A Filtering Quadrature Coupler Modementioning

confidence: 99%

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Novel Evanescent-Mode Cavity Filter With Reconfigurable Rat-Race Coupler, Quadrature Coupler and Multi-Pole Filtering Functions

et al. 2020

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A novel evanescent-mode cavity filter with multiple reconfigurable functions including filtering rat-race coupler, filtering quadrature coupler and multi-pole filtering is proposed in this paper. It simply consists of four substrate integrated waveguide (SIW) evanescent-mode cavity resonators which are arranged in a ring loop. By loading piezoelectric actuators on top of each resonator and inserting varactors between adjacent resonators, the structure can achieve multiple reconfigurable functions among filtering rat-race coupler, filtering quadrature coupler and single-ended multi-pole filters, in addition to continuously frequency, independent bandwidth, and power-division tuning. Measurement shows that the filtering quadrature coupler corves a frequency range of 2.08-3.00 GHz with insertion loss of 2.99 ± 0.31dB, while the filtering rat-race coupler corves a frequency range of 2.31-2.71 GHz with insertion loss of 2.97 ± 0.13dB; The single-ended filter can be switched among two-pole, three-pole, and four-pole with frequency range of 2.38 to 3.01 GHz, 2.47 to 3.08 GHz and 2.53 to 3.00 GHz, respectively. Good agreement is obtained between simulated and measured results. INDEX TERMS Evanescent-mode cavity, quadrature coupler, rat-race coupler, reconfigurable filters. FIGURE 1. Structure of the proposed multifunction filtering coupler. (a) 3D-view. (b) Top view.

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Section: ) Fourth-order Filtering Modementioning

confidence: 99%

Section: A Filtering Quadrature Coupler Modementioning

confidence: 99%

Novel Evanescent-Mode Cavity Filter With Reconfigurable Rat-Race Coupler, Quadrature Coupler and Multi-Pole Filtering Functions

et al. 2020

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“…With increasing demands for modern communication systems, miniaturization and high selectivity microwave bandpass filters (BPFs) have become urgently demanded. Substrate integrated waveguide (SIW) circuits [1][2][3][4][5][6][7][8][9] have attracted wide attention due to various advantages and characteristics, such as easy fabrication, high power handling capability, low insertion loss (IL), and easy integration with other circuits. However, conventional SIW filters still have relatively large circuit sizes.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, half-mode (HM) [1], quarter-mode (QM) [2], and eighth-mode (EM) [3] SIW have been proposed, which decrease the dimension to 50%, 25%, and 12.5%, respectively, while maintaining the performance unchanged. To obtain high selectivity, FDC techniques [4][5][6][7][8][9][10][11][12][13] introduce additional finite transmission zeros without changing the topology and filter size. For SIW, due to its excellent coplanar properties, both constant and frequency-dependent couplings can be performed on it with positive effects.…”

Section: Introductionmentioning

confidence: 99%

“…In this paper, a coupling matrix (CM) synthesis procedure [9][10][11][12] is implemented to design second order filters: QMSIW and EMSIW. The detailed parameters of discontinuous structures containing FDC [4][5][6][7][8] are theoretically synthesized and simulated. As expected, one transmission zero is generated at the frequency point, where electric coupling cancels out with magnetic coupling for the designed BPFs by frequency dependent coupling between cavities.…”

Section: Introductionmentioning

confidence: 99%

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Compact Quarter Mode and Eighth Mode Substrate Integrated Waveguide Bandpass Filters With Frequency-Dependent Coupling

Shi¹,

Li²,

Song³

et al. 2021

PIER Letters

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This paper presents two size-miniaturized quarter mode (QM) and eighth mode (EM) substrate integrated waveguide (SIW) bandpass filters (BPFs), which are embedded with a novel frequency-dependent coupling (FDC) structure. The proposed FDC is implemented as a composition of balanced folding lines and inductive iris. One additional transmission zero (TZ) introduced by FDC between two cavities leads to higher frequency selectivity and better out-of-band rejection. Higher order modes suppression appears by combining the loaded open stubs on feeder lines with FDC technique, achieving a wide stopband. Meanwhile, the circuit dimension is further reduced by symmetrically cutting SIW. To validate the novel approach, the frequency-dependent coupling matrix (CM) is implemented to determine characteristics of the proposed structure in theory. QM-and EM-SIW BPFs loaded with FDC have been designed, fabricated, and measured. Experimental results illustrate the characteristics of miniaturization and good performance. All results are in good agreement.

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An inline pseudoelliptic self‐packaging substrate integrated suspended line filter with mixed electric and magnetic coupling

Xia

Xie

et al. 2020

Int J RF Microw Comput Aided Eng

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A Novel Frequency-Dependent Coupling With Flexibly Controllable Slope and Its Applications on Substrate-Integrated Waveguide Filters

Cited by 28 publications

References 12 publications

Novel Evanescent-Mode Cavity Filter With Reconfigurable Rat-Race Coupler, Quadrature Coupler and Multi-Pole Filtering Functions

Novel Evanescent-Mode Cavity Filter With Reconfigurable Rat-Race Coupler, Quadrature Coupler and Multi-Pole Filtering Functions

Compact Quarter Mode and Eighth Mode Substrate Integrated Waveguide Bandpass Filters With Frequency-Dependent Coupling

An inline pseudoelliptic self‐packaging substrate integrated suspended line filter with mixed electric and magnetic coupling

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