Ultracompact 3-D Bandpass Filters Using Mixed Subcylindrical and Subspherical Resonators

Ajay Mothe; Dimitra Psychogiou

doi:10.1109/LMWT.2025.3596777

Ultracompact 3-D Bandpass Filters Using Mixed Subcylindrical and Subspherical Resonators

Ajay Mothe
, Dimitra Psychogiou

University College Cork

Research output: Contribution to journal › Article › peer-review

Abstract

New types of ultracompact 3-D bandpass filters (BPFs) are presented. They are based on a new class of a half-cylindrical (HC) resonator concept and a mixed filter integration scheme with half-spherical (HS) and quarter-spherical (QS) resonators, aiming to optimally occupy an available cubical 3-D volume. By integrating HC resonators with subspherical cavities, 3-D BPFs with a very low axial ratio (AR) can be obtained. Size compactness and ultralow weight are achieved using monolithic integration enabled by stereolithography apparatus 3-D printing. The concept is validated via four different BPF prototypes at the Ku band, namely a two-pole/one-transmission zero (TZ) HC, a two-pole HC-HS, a three-pole HC-HS-HC, and a four-pole HC-QS-QS-HC BPFs achieving effective quality factors of up to 2550, ARs between 0.7 and 1.3, and a wide spur-free response up to 1.56 times the center frequency.

Original language	English
Journal	IEEE Microwave and Wireless Technology Letters
DOIs	https://doi.org/10.1109/LMWT.2025.3596777
Publication status	Published - 2025

Keywords

3-D printing
bandpass filter (BPF)
mixed-cavity filters
Band-pass filter
Resonator
Acoustics
Physics
Optics

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

Access to Document

10.1109/LMWT.2025.3596777

Cite this

@article{18fd6f451036415e819be020ffae144b,

title = "Ultracompact 3-D Bandpass Filters Using Mixed Subcylindrical and Subspherical Resonators",

abstract = "New types of ultracompact 3-D bandpass filters (BPFs) are presented. They are based on a new class of a half-cylindrical (HC) resonator concept and a mixed filter integration scheme with half-spherical (HS) and quarter-spherical (QS) resonators, aiming to optimally occupy an available cubical 3-D volume. By integrating HC resonators with subspherical cavities, 3-D BPFs with a very low axial ratio (AR) can be obtained. Size compactness and ultralow weight are achieved using monolithic integration enabled by stereolithography apparatus 3-D printing. The concept is validated via four different BPF prototypes at the Ku band, namely a two-pole/one-transmission zero (TZ) HC, a two-pole HC-HS, a three-pole HC-HS-HC, and a four-pole HC-QS-QS-HC BPFs achieving effective quality factors of up to 2550, ARs between 0.7 and 1.3, and a wide spur-free response up to 1.56 times the center frequency.",

keywords = "3-D printing, bandpass filter (BPF), mixed-cavity filters, Band-pass filter, Resonator, Acoustics, Physics, Optics",

author = "Ajay Mothe and Dimitra Psychogiou",

note = "Publisher Copyright: {\textcopyright} 2025 The Authors.",

year = "2025",

doi = "10.1109/LMWT.2025.3596777",

language = "English",

journal = "IEEE Microwave and Wireless Technology Letters",

issn = "2771-957X",

publisher = "Institute of Electrical and Electronics Engineers Inc.",

}

TY - JOUR

T1 - Ultracompact 3-D Bandpass Filters Using Mixed Subcylindrical and Subspherical Resonators

AU - Mothe, Ajay

AU - Psychogiou, Dimitra

PY - 2025

Y1 - 2025

N2 - New types of ultracompact 3-D bandpass filters (BPFs) are presented. They are based on a new class of a half-cylindrical (HC) resonator concept and a mixed filter integration scheme with half-spherical (HS) and quarter-spherical (QS) resonators, aiming to optimally occupy an available cubical 3-D volume. By integrating HC resonators with subspherical cavities, 3-D BPFs with a very low axial ratio (AR) can be obtained. Size compactness and ultralow weight are achieved using monolithic integration enabled by stereolithography apparatus 3-D printing. The concept is validated via four different BPF prototypes at the Ku band, namely a two-pole/one-transmission zero (TZ) HC, a two-pole HC-HS, a three-pole HC-HS-HC, and a four-pole HC-QS-QS-HC BPFs achieving effective quality factors of up to 2550, ARs between 0.7 and 1.3, and a wide spur-free response up to 1.56 times the center frequency.

AB - New types of ultracompact 3-D bandpass filters (BPFs) are presented. They are based on a new class of a half-cylindrical (HC) resonator concept and a mixed filter integration scheme with half-spherical (HS) and quarter-spherical (QS) resonators, aiming to optimally occupy an available cubical 3-D volume. By integrating HC resonators with subspherical cavities, 3-D BPFs with a very low axial ratio (AR) can be obtained. Size compactness and ultralow weight are achieved using monolithic integration enabled by stereolithography apparatus 3-D printing. The concept is validated via four different BPF prototypes at the Ku band, namely a two-pole/one-transmission zero (TZ) HC, a two-pole HC-HS, a three-pole HC-HS-HC, and a four-pole HC-QS-QS-HC BPFs achieving effective quality factors of up to 2550, ARs between 0.7 and 1.3, and a wide spur-free response up to 1.56 times the center frequency.

KW - 3-D printing

KW - bandpass filter (BPF)

KW - mixed-cavity filters

KW - Band-pass filter

KW - Resonator

KW - Acoustics

KW - Physics

KW - Optics

UR - https://www.scopus.com/pages/publications/105013791519

U2 - 10.1109/LMWT.2025.3596777

DO - 10.1109/LMWT.2025.3596777

M3 - Article

AN - SCOPUS:105013791519

SN - 2771-957X

JO - IEEE Microwave and Wireless Technology Letters

JF - IEEE Microwave and Wireless Technology Letters

ER -

Ultracompact 3-D Bandpass Filters Using Mixed Subcylindrical and Subspherical Resonators

Abstract

Keywords

UN SDGs

Access to Document

Other files and links

Fingerprint

Cite this