A Versatile 3-D Printable Model for Implementing Multiband Waveguide Filters With Flexible Filtering Characteristics

Vaitukaitis, Povilas; Nai, Kenneth; Hong, Jiasheng

doi:10.1109/access.2023.3322364

Cited by 4 publications

(10 citation statements)

References 23 publications

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“…This topology allows the realisation of N TZs between each passband and flexible control of centre frequencies and bandwidths. The flexibility of the compound resonator approach was demonstrated in [4], where the reconfigurability of dual-band filtering characteristics was shown with several examples. The compound resonator coupling topology for a tripleband filter is shown in Fig.…”

Section: B Compound Resonator Topologymentioning

confidence: 99%

“…There are two primary implementations of multiband filters: combining single-band filters via manifold or circulators or using multimode resonators where each mode corresponds to a specific passband. The former approach provides the best design flexibility [3], [4] but has a large footprint. The latter method has lower design flexibility but significantly reduces footprint [4], [5].…”

Section: Introductionmentioning

confidence: 99%

“…The former approach provides the best design flexibility [3], [4] but has a large footprint. The latter method has lower design flexibility but significantly reduces footprint [4], [5]. Another, less explored in the literature, method of implementing multiband filters is an in-band transmission zeros (TZs).…”

Section: Introductionmentioning

confidence: 99%

“…This approach sits somewhere between the two aforementioned methods. It has better design flexibility but a larger size than multimode resonators and lower design flexibility but a more compact size than the manifold approach [4]. Thus, the in-band TZ approach presents an excellent middle ground between the two popular implementations.…”

Section: Introductionmentioning

confidence: 99%

“…This paper presents a high-Q multiband filter implementation using spherical resonators. The proposed model uses an in-band transmission zeros approach like the work presented in [4]. However, there are some key differences:…”

Section: Introductionmentioning

confidence: 99%

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Investigation of Metal 3-D Printed High-Q Multiband Waveguide Filters Using Spherical Resonators

Vaitukaitis,

Nai,

Hong

2024

IEEE Access

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This paper proposes a high-Q multiband waveguide filter implementation using spherical resonators and an in-band transmission zeros approach. Three prototype filters in Ku-band, one 3 rd order triple-band filter with a fundamental TM 101 mode and two 5 th order dual-band filters with TM 101 and TE 101 modes, are designed to validate the model. Compared to the previous multiband waveguide filter model using cylindrical resonators, the presented model can realise all expected N transmission zeros between the bands, where N is the filter order, and has a 112% higher simulated Q u value. Meanwhile, the designed very narrowband dual-band filter using spherical resonators with TE 101 mode has about 287% higher simulated Q u value than the same filter would have if using rectangular resonator with TE 101 mode. For experimental validation, the 3 rd order triple-band filter was fabricated using Selective Laser Melting since using traditional milling techniques is not feasible for spherical resonator filters. Monolithic near-net shape fabrication eliminated assembly, improved reliability, and reduced weight. The measured results had a relatively good agreement with the simulations. The measured insertion loss was about 0.54-0.72 dB at the centre frequency of each band, which is a noticeable improvement over the 1.1 dB insertion loss of the previous cylindrical resonator triple-band filter prototype. As there were some deviations between simulated and measured results, the proposed design was inspected in detail, and several improvements for optimising the design for Additive Manufacturing were suggested.INDEX TERMS Dual-band filter, high-Q, in-band transmission zeros, metal 3-D printing, multiband filter, spherical resonator, triple-band filter, waveguide filter.

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Section: B Compound Resonator Topologymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Investigation of Metal 3-D Printed High-Q Multiband Waveguide Filters Using Spherical Resonators

Vaitukaitis,

Nai,

Hong

2024

IEEE Access

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Second order triple band waveguide band-pass filter with adjustable centre frequency and 3-dB bandwidth

Bage

2024

International Journal of Electronics Letters

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Dual-Band Bandpass Filters Using 3D Printed Dual-Mode Nested Spherical Resonators

Liu,

Psychogiou

2024

IEEE Access

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This paper reports on a new class of 3D additively-manufactured dual-band bandpass filters (BPFs). They are based on miniaturized dual-mode nested-spherical resonators which consist of two postsupported metallic spheres that load a hollow spherical cavity and give rise to two independently-controlled resonant modes. The two modes can be exploited for the realization of dual-band BPFs with two independently-controlled bands in terms of frequency and bandwidth. The four transmission zeros (TZs) also can be controlled which give rise to better stopband response. To validate the filter concept, a dual-band BPF was designed, manufactured and measured. It exhibited, two passbands centered at 1.5 GHz and 2.47 GHz with fractional bandwidths (FBWs) of 8.13 and 2.87 %, in-band insertion loss (IL) of 0.14 and 0.39 dB, and effective Q factor (Qeff) of 1,448 and 2,088 respectively. The measured and simulated results have a good agreement. A low-cost and compact monolithic integration concept enabled by stereolithography apparatus (SLA) additive manufacturing is also demonstrated. INDEX TERMSAdditive manufacturing (AM), Bandpass filters (BPFs), Dual-band filter, Low-loss filter, RF-filter.

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A Versatile 3-D Printable Model for Implementing Multiband Waveguide Filters With Flexible Filtering Characteristics

Cited by 4 publications

References 23 publications

Investigation of Metal 3-D Printed High-Q Multiband Waveguide Filters Using Spherical Resonators

Investigation of Metal 3-D Printed High-Q Multiband Waveguide Filters Using Spherical Resonators

Second order triple band waveguide band-pass filter with adjustable centre frequency and 3-dB bandwidth

Dual-Band Bandpass Filters Using 3D Printed Dual-Mode Nested Spherical Resonators

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