Triple-Mode Ceramic Cavity Filters With Wide Spurious-Free Performance

Hendry, David; Abbosh, Amin

doi:10.1109/tmtt.2017.2686859

Cited by 25 publications

(11 citation statements)

References 16 publications

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“…More complex triple-mode configurations are reported in [97] and [98], the latter employing a ceramic cavity. These works rely on building blocks implementing third order transversal topologies (three resonant modes connected in parallel between input and output).…”

Section: Emerging Technique Pseudo-elliptic Realizationsmentioning

confidence: 95%

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: Emerging Technique Pseudo-elliptic Realizationsmentioning

confidence: 95%

Emerging Trends in Techniques and Technology as Applied to Filter Design

et al. 2021

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“…To restrain the spurious bands, two SIW cavities operating on fundamental mode can be cascaded to the proposed fourth-order filter structure in the input and output ports, respectively, to realise sixth-order filters. Moreover, the two cavities have dissimilar spurious frequencies in series, thereby decoupling spurious modes through the filter [15]. Table 1 summarises some reported performances of BPFs using SIW technology in references for comparison.…”

Section: Second Filter IImentioning

confidence: 99%

Ultra‐compact highly selective quasi‐elliptic filters based on combining dual‐mode SIW and coplanar waveguides in a single cavity

Liu¹,

Zhou²,

Lv³

et al. 2018

IET Microwaves, Antennas & Propagation

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Two bandpass filters (BPFs) are implemented on a single dual‐mode square‐shaped substrate‐integrated waveguide (SIW) cavity with two etched coplanar waveguides. The proposed BPFs can achieve two transmission zeros (TZs) using dual modes in the SIW cavity (i.e. TE102 and TE201) with non‐resonating mode (i.e. fundamental TE101), which provides a direct input‐to‐output coupling. Moreover, the positions of the two TZs can be tuned by changing the positions of input and output ports. Moreover, an extra TZ with controllable position is also achieved by using controllable electric and magnetic mixed coupling; and the TZ also can be split into two TZs for the mixed cross‐coupling paths. The BPFs with the controllable TZs improve the selectivity and out‐of‐band rejection. The designed BPFs have a centre frequency of 5.8 GHz. The measured results agree with the simulated ones.

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“…6 Moreover, dielectric resonators with surface metal coating can reduce filter sizes. [7][8][9][10][11] The structure decomposed method is effective for designing filters with complex configuration. 12 However, for multimode dielectric cavity filters, methods of frequency tuning, feeding, coupling, and spurious-free window expanding are still required to be improved.…”

Section: Introductionmentioning

confidence: 99%

Novel compact bandpass filter using sextuple‐mode ceramic cavity resonator

Xin-hui

Cao

Yuan

et al. 2022

Micro & Optical Tech Letters

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This letter proposes a novel compact ceramic cavity bandpass filter with surface silver coating and air coupling apertures. It is constituted of a sextuplemode ceramic cavity as the main resonator, two single-mode cavities to connect the sextuple modes transversely with source and load, and two single cavities to suppress higher harmonics. This proposed filter has the advantages of compact size, wide band, low insertion loss, high selectivity, wide spuriousfree window, as well as coplanar source and load interfaces. There are no blind holes in the filter, which is beneficial for improving the machining accuracy.One prototype filter operating at 3.5 GHz is fabricated and measured. The minimum insertion loss in the passband is 0.65 dB. The inherent spurious mode of the sextuple-mode resonator at around 1.2f C (f C center frequency) is suppressed under −30 dB. The measured and simulated results are in good agreement.

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Triple-Mode Ceramic Cavity Filters With Wide Spurious-Free Performance

Cited by 25 publications

References 16 publications

Emerging Trends in Techniques and Technology as Applied to Filter Design

Emerging Trends in Techniques and Technology as Applied to Filter Design

Ultra‐compact highly selective quasi‐elliptic filters based on combining dual‐mode SIW and coplanar waveguides in a single cavity

Novel compact bandpass filter using sextuple‐mode ceramic cavity resonator

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