Present and Future Trends in Filters and Multiplexers

Snyder, Richard V.; Mortazawi, Amir; Hunter, I.C.; Bastioli, Simone; Macchiarella, Giuseppe; Wu, Ke

doi:10.1109/tmtt.2015.2475245

Cited by 79 publications

(37 citation statements)

References 112 publications

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“…The use of non-resonating modes (NRM) as resonator bypassing elements for TM dual-mode configurations was pioneered by R. Sorrentino and S. Bastioli [43], and then extended to various microwave filter technologies by Bastioli and Snyder [101], [44], [45], and in conjunction with NRN techniques, provides new levels of miniaturization and efficiency in both waveguide and coaxial filter and multiplexer design.…”

Section: B Current Developmentsmentioning

confidence: 99%

Emerging Trends in Techniques and Technology as Applied to Filter Design

et al. 2021

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In the last decade, the filter community has innovated both design techniques and the technology used for practical implementation. In design, the philosophy has become "if you can't avoid it, use it", a very practical engineering approach. Modes previously deemed spurious are intentionally used to create in-line networks incorporating real or imaginary transmission zeros and also reduce the number of components and thus further miniaturize; spurious responses are re-routed to increase the passband width or stopband width, frequency variation in couplings is used to create complex transfer functions, with all of these developments using what was previously avoided. Clever implementations of baluns into passive and active networks is resulting in a new generation of noise-immune filters for 5G and beyond. Finally, the use of a diakoptic approach to synthesis has appeared an evolving approach in which small blocks ("singlets", "doublets", etc.) are cascaded to implement larger networks, (reducing the need for very complex synthesis), with this new approach promising a large impact on the implementation of practical structures. Filter technology has migrated towards "observe it and then adapt it", pragmatically repurposing tools not specifically originally intended for the applications. Combinations of surface wave and bulk wave resonators with L-C networks are improving the loss characteristics of filters in the region below 2 GHz. Lightweight alloys and other materials designed for spacecraft are being used in filters intended for space, to provide temperature stability without the use of heavy alloys such as Invar. Fully-enclosed waveguide is being replaced in some cases by planar and quasiplanar structures propagating quasi-waveguide modes. This is generically referred to as SIW (Substrate Integrated Waveguide). Active filters trade noise figure for insertion loss but perhaps will offer advantage in terms of size and chip-level implementation. Finally, the era of reconfiguration might be approaching, as the basic networks are evolving, perhaps lacking only the appearance of lower-loss, higher-IP solid-state tuning elements.

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Section: B Current Developmentsmentioning

confidence: 99%

Emerging Trends in Techniques and Technology as Applied to Filter Design

et al. 2021

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“…However, with the increment in the number of the matching networks, not only the size of the circuit is large, but also it is difficult to optimize the circuit, which is mainly caused by the interaction between various filters [16][17][18][19][20]. So the design of common part in the form of common resonator is introduced in order to miniaturize the multiplexer circuit, which cannot contain external combining circuits [21][22][23][24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Compact multimode-resonator multiplexer with wide upper-stopband and high isolation

Song

Luo

Zhong³

et al. 2020

Int. J. Microw. Wireless Technol.

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A miniaturized high-isolation quadplexer with wide upper-stopband based on open and short stub-loaded multimode-resonator is proposed in this paper. Based on the theory of multimode-resonator and stepped impedance resonator (SIR), the compact quadplexer is designed by using multimode-resonator and SIR. In order to further miniaturize the size of the circuit, the multimode resonator is employed as the common resonator to replace the common matching network of the quadplexer and the SIRs are curved. Equivalent topology circuit is given to analyze and design the quadplexer. Detailed analyses are given according to the equivalent circuits. The proposed compact quadplexer working at central frequencies of 1.8, 2.4, 2.8, and 3.5 GHz with over 40 dB isolation is finally simulated, fabricated, and measured. The measured results agree well with the simulated ones. The total size of the fabricated quadplexer is 0.36 λg × 0.42 λg.

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“…Despite the wide application of miniature microstrip filters in microwave technology, interest in waveguide filters, in particular, made on the basis of combinations of waveguide sections and metal membranes [1][2][3], is observed in the development and study of filter structures of the microwave range.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Simulation Frequency Characteristics of L-Shaped Waveguide-Slot Membranes Bandpass Filters

Natalia¹,

Alexei²,

Dmitri³

et al. 2018

J. Sib. Fed. Univ. Eng. technol.

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The article presents the results of experimental research and numerical simulation of the amplitude-frequency characteristics (AFC) of the voltage transmission ratio (voltage gain) |Ku| and frequency characteristics of the voltage standing wave ratio from the input (input VSWR) to three bandpass filters on the waveguide-slot membranes (WSM) with L-shaped resonance slot: to the single stage, to the three stages and to the four stages. The filter designs are given in article. The results of numerical simulation and experimental study show that in the frequency range 5,0...8,5 GHz filters provide attenuation behind the pass band up to 30 dB at the level of the introduced losses in the pass-band from 0,2 to 1,0 dB. The values of the calculated and experimental input VSWR in the filter bandwidth of pass-band are from 1,1 to 1,74 relative units (r. u.) and in the stop bands from 2 to 300 r. u. The authors believe that using of waveguide-slot membranes will significantly reduce the overall dimensions of microwave bandpass and bandstop filters in the middle of the centimeter wavelength range.

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Present and Future Trends in Filters and Multiplexers

Cited by 79 publications

References 112 publications

Emerging Trends in Techniques and Technology as Applied to Filter Design

Emerging Trends in Techniques and Technology as Applied to Filter Design

Compact multimode-resonator multiplexer with wide upper-stopband and high isolation

Experimental and Numerical Simulation Frequency Characteristics of L-Shaped Waveguide-Slot Membranes Bandpass Filters

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