Analysis of Compact Triple-Mode Ceramic Cavity Filters Using Parallel-Coupled Resonators Approach

Hendry, David; Abbosh, Amin

doi:10.1109/tmtt.2016.2577579

Cited by 20 publications

(11 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In dual-mode [7] and triply-degenerate (e.g. cubic [1]) resonators, the modes are split when a perturbation is introduced to the corners located along the symmetrical plane. The field distributions seen undergoes a natural rotating behavoiur in a 2-D-like fashion.…”

Section: Modes In Triple-mode Dielectric Resonator Filtersmentioning

confidence: 99%

“…Further size reduction can be achieved by using multiple degenerate modes which increases the efficiency of volume per resonance for a given Q factor. A major advantage of multiple mode resonators is the ability to realise real-frequency transmission zeros (TZs) in in-line or cascaded configuration without the need to introduce physical cross-coupling structures [1]- [4]. Despite these advantages, the ability to individually generate and control TZs is a daunting task.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Triple-Mode Microwave Filters With Arbitrary Prescribed Transmission Zeros

Bakr

2021

IEEE Access

View full text Add to dashboard Cite

This article presents a new filter design for arbitrary placement of real frequency transmission zeros in triple-mode filters, allowing for either asymmetric or symmetric responses. Triple-mode filters can be viewed, in general, as a series combination of coupled resonators with non-adjacent couplings, allowing for the realisation of transmission zeros. The strength and phase of couplings dictate the transmission zeros locations. The arbitrary placement of transmission zeros requires controlling all amplitude and phase rations, i.e., the ability to realise both negative and positive couplings. In general, this necessitates the use of capacitive and inductive probe structures complicating the construction and hence increasing the filter cost. The method presented in this article enables arbitrary placement of transmission zeros using only inductive or only capacitive couplings structures. In addition, broadband filtering characteristics can be realised using triple-mode filters. Examples of several narrow and broadband bandpass filters are given indicating that this method is valid for most triple-mode structures.

show abstract

Section: Modes In Triple-mode Dielectric Resonator Filtersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Triple-Mode Microwave Filters With Arbitrary Prescribed Transmission Zeros

Bakr

2021

IEEE Access

View full text Add to dashboard Cite

show abstract

“…This might degrade the resonator quality factor and increase the design complexity due to the lack of independent control of each resonant frequency and the spurious couplings between the multi-modes. In [9], parallel coupled resonator approach was used to design triple-mode dielectric resonator filters without inter-resonator couplings; thus, simplifying the filter design complexity.…”

Section: Introductionmentioning

confidence: 99%

Miniature Triple-Mode Dielectric Resonator Filters

Bakr

Hunter

Bösch

2018

IEEE Trans. Microwave Theory Techn.

View full text Add to dashboard Cite

In this paper, a new class of triple-mode microwave filters is presented. These devices use the degenerate pair of the HE 11δ mode and the single T M 01δ mode in dielectric-loaded cavities with unloaded Q-factor of 3000-5000 and reasonable spurious-free window. The proposed structure is obtainable in less than one quarter of the physical volume of equivalent TEM filters. A finite element method solver for electromagnetic structures (HFSS) is used to study the main properties of this resonator. Fundamental design rules for triple-mode bandpass filters with controllable finite transmission zeros are presented. Design examples of bandpass filters with finite transmission zeros on the high or low or both sides of the passband are demonstrated. Measured results demonstrate excellent performance.

show abstract

“…Jin and Shen designs a triple‐mode filter implemented in an isosceles right triangular waveguide with one electric wall and two magnetic walls. Finally, a triple‐mode ceramic cavity filter using the parallel‐coupled resonators is discussed in Hendry and Abbosh …”

Section: Introductionmentioning

confidence: 99%

“…Finally, a triple-mode ceramic cavity filter using the parallelcoupled resonators is discussed in Hendry and Abbosh. 20 In reality, it is not easy to design microstrip filters for the sake of distributed-element effect. Usually, they are different in forms and might lead to different physical mechanism.…”

mentioning

confidence: 99%

Compact third‐order microstrip bandpass filter designed by the distributed‐ to lumped‐element equivalence

Xiao

Cao

et al. 2018

Circuit Theory & Apps

View full text Add to dashboard Cite

Summary In reality, it is not easy to design microstrip filters for the sake of distributed‐element effect. It is an effective approach to approximate distributed‐element structures through appropriate lumped‐element circuits. In this paper, some basic microstrip structures are discussed, whose equivalent lumped‐element circuits are derived. Then, a novel microstrip filter is obtained by connecting these microstrip structures, according to the similar topology of the third‐order lumped‐element bandpass filter. The equivalent lumped‐element counterpart of the proposed microstrip filter clearly reveals its physical mechanism, ie, how the resonances are created and coupled and how the transmission zeros are created. Furthermore, a set of the design formulas are presented, which can be used to calculate initial structure parameters and then facilitate design process. The proposed microstrip bandpass filter can realize a third‐order elliptic bandpass response with one transmission zero at each side of the passband. In addition, two short‐circuited stubs are added to input/output ports to create the third transmission zero. The filter is featured by good frequency selectivity and out‐of‐band suppression. For demonstration, an actual example was designed, fabricated, and measured.

show abstract

Analysis of Compact Triple-Mode Ceramic Cavity Filters Using Parallel-Coupled Resonators Approach

Cited by 20 publications

References 28 publications

Triple-Mode Microwave Filters With Arbitrary Prescribed Transmission Zeros

Triple-Mode Microwave Filters With Arbitrary Prescribed Transmission Zeros

Miniature Triple-Mode Dielectric Resonator Filters

Compact third‐order microstrip bandpass filter designed by the distributed‐ to lumped‐element equivalence

Contact Info

Product

Resources

About