Ring-Shaped <i>D</i>-Band <i>E</i>-Plane Filtering Coupler

Chen, Xun; Wang, Yi

doi:10.1109/lmwc.2021.3082524

Cited by 10 publications

(5 citation statements)

References 14 publications

(14 reference statements)

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“…However, the obvious drawback is the overly narrow bandwidth. As observed in [9][10][11], the bandwidths were all less than <5%. For bandwidth improvement, filtering sections are usually used to replace the transmission lines (TLs) in the RC.…”

Section: Introductionsupporting

confidence: 53%

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Wideband Filtering Rat-Race Coupler with Shared Triple-Mode Resonator

et al. 2023

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In this paper, a filtering rat-race coupler (FRC) is presented, which features the merits of a wideband filtering response, good impedance matching at both input and output ports, good isolation, high-frequency selectivity, small in-band phase difference error, a wide stopband, and small size. It was composed of two leading triple-mode resonators, one core section, and two λ/2 open-circuited transmission lines (TLs). The core section consisted of three λ/4 TLs and one λ/4 short-circuited parallel coupled line (CL). The leading triple-mode resonator consisted of one λ/4 short-circuited stub and two λ/4 TLs. By loading the triple-mode resonator as the shared component and combining it with the core section, a wideband filtering response with four transmission poles could be achieved. In addition, two transmission zeros were generated by loading the λ/2 open-circuited TLs to the output ports of the FRC. The working principles of the proposed FRC are analyzed, and equations are derived with parametric analysis. For demonstration, a prototype operating at the center frequency of 1.4 GHz was designed, fabricated, and measured. Measurement results show that a fractional bandwidth of more than 60% was achieved under the criteria of 10 dB return loss and 20 dB isolation. In this bandwidth, the amplitude imbalances and phase difference errors were less than 1 dB and 10°, respectively. Additionally, it also exhibited high selectivity and a wide stopband.

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Section: Introductionsupporting

confidence: 53%

“…In recent years, many efforts have been conducted to integrate RCs and BPFs as multifunctional FRCs. In general, resonators [9][10][11] are loaded on traditional RCs for realizing filtering responses. However, the obvious drawback is the overly narrow bandwidth.…”

Section: Introductionmentioning

confidence: 99%

Wideband Filtering Rat-Race Coupler with Shared Triple-Mode Resonator

et al. 2023

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“…The couplings to P3, P4, P5 and P6 are capacitive (to realize large couplings) while others are inductive. Resonators 1 to 4 are bent into a ring [30] to realize the E-plane structure with no capacitive iris. Resonator 11,12,19 and 20 are also bent.…”

Section: Realization Of the D-band E-plane Filtering Spjmentioning

confidence: 99%

Subterahertz Filtering Six-Port Junction

Chen

Salek

Wang

2022

IEEE Trans. Microwave Theory Techn.

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This paper presents a D-band E-plane 90° filtering coupler and a D-band six-port junction (SPJ), both working at 150 GHz. The coupler is formed by ten resonators, having a fourth-order Chebyshev response. Two of the couplers were combined with a 90° 3-dB branch-line coupler to build the filtering SPJ with twenty resonators in total. Inheriting from the filtering coupler, the SPJ also has a fourth-order Chebyshev response. A coupling matrix (CM) consisting of both resonant and non-resonant nodes, based on the coupling topology, was constructed to predict the theoretical responses. Guided by this coupling matrix, the coupler and the SPJ were designed and modelled. In addition, two silicon-based absorber chips were designed and implemented as two matched loads in the filtering SPJ. The SPJ was optimized, fabricated and tested. The center frequency of the SPJ is 150 GHz and the bandwidth is 4 GHz. Simulation shows 0.5 to 0.7 dB insertion loss at 150 GHz and maximum 3° phase error in the working band. The measurement gives the same center frequency and bandwidth. The response shows 0.7 to 2.0 dB insertion loss at 150 GHz and maximum 15° phase error in the working band.

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“…Whereas, to design an N ‐order filtering response, at least 2 N − 1 cavity resonators are needed, resulting in a bulky size and a heavy weight. In the study by Chen et al, 14 owning to the reverse E‐field distributions of TE 101 and TE 102 modes, functions of the filter and magic‐T are both realized. While the ring‐shaped architecture is not easy for high‐order filtering response.…”

Section: Introductionmentioning

confidence: 99%

“…Waveguide with high-quality factor (Q factor) has been reported to realize filtering magic-Ts. 13,14 In the study by Lin et al, 13 based on the odd-and evensymmetrical electric field (E-field) distributions of the three modes in the cavity resonator, in-phase and out-of-phase output currents and 20 dB port isolations are obtained accordingly. Whereas, to design an N-order filtering response, at least 2N − 1 cavity resonators are needed, resulting in a bulky size and a heavy weight.…”

Section: Introductionmentioning

confidence: 99%

Compact filtering magic‐T using a hybrid microstrip‐cavity structure

Fang

et al. 2023

Micro & Optical Tech Letters

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This letter introduces a filtering magic-T based on a hybrid microstrip-cavity structure. TE 011 and TE 101 modes of the cavity are generated by the two perpendicular input microstrip lines to form the filtering responses. Because of the orthogonality of the feeding lines and the two resonant modes, in-and outof-phase output currents and high port isolations are achieved. The measured filtering responses of the two input ports are in good agreement with each other and possess high-frequency selectivity. The isolations of the input and output ports are below 41 and 22 dB, respectively. Moreover, benefiting from the hybrid microstrip-cavity structure, only two cavity resonators are employed, which realizes compact size.

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Ring-Shaped D-Band E-Plane Filtering Coupler

Cited by 10 publications

References 14 publications

Wideband Filtering Rat-Race Coupler with Shared Triple-Mode Resonator

Wideband Filtering Rat-Race Coupler with Shared Triple-Mode Resonator

Subterahertz Filtering Six-Port Junction

Compact filtering magic‐T using a hybrid microstrip‐cavity structure

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