Design of Comb-Line Band-Pass Filters (Correspondence)

Kurzrok, R.M.

doi:10.1109/tmtt.1966.1126269

Cited by 27 publications

(3 citation statements)

References 6 publications

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“…On the other hand, shortening of the resonator line length degrades the unloaded quality factor and increases the pass-band insertion loss due to dissipation. Kurzrok gives an empirical relationship applicable to CLF resonators of constant cross section (Kurzrok, 1966):…”

Section: Miniaturisation Of the Combline Filtermentioning

confidence: 99%

Miniaturisation of combline filters for switched-mode power amplifier systems

2008

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Abstract. This paper presents a coaxial combline filter for a class-S power amplifier for an operating frequency of 450 MHz. According to the measurement results, the filter provides a bandwidth of 26 MHz, an insertion loss of 0.55 dB, and a second pass-band only at 2.8 GHz. As the filter dimensions are crucial for the envisaged application, different ways to miniaturise the filter are proposed and their features and disadvantages discussed.

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Section: Miniaturisation Of the Combline Filtermentioning

confidence: 99%

Miniaturisation of combline filters for switched-mode power amplifier systems

2008

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“…Introduction: There exists a strong interest in the telecommunications industry for cost-effective and low-volume resonators and filters, driven, primarily, by the need for increased integration. Usually, such filters come in the form of ceramic-filled coaxial TEM filters or ceramic waveguides, depending on the required performance level [1,2]. However, the compact size of such devices comes at the cost of reduced performance, due to the losses of the ceramic materials.…”

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confidence: 99%

Multi‐layered PCB distributed filter

Bulja

Kozlov

2021

Electronics Letters

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In this paper, multi‐layered print circuit board distributed resonators and filters are introduced. Here, the individual elements of the distributed resonator are made as part of a multi‐layered print circuit board, commonly used in the circuitry of transceiver boards. In this way, the unused real estate available on the board is used effectively. As a demonstrator of the proposed technology, a 2‐pole filter fabricated using a 5‐layer substrate and consisting of a matrix of 11 × 11 elements per resonator is fabricated and its performance is measured. Due to a large number of individual elements, which perform dimensional averaging of manufacturing inaccuracies, the filter obtained in this way not only requires no post‐production tuning, but it also has an extremely low profile of 5o, which is the lowest profile to be reported in the literature. The filter was made to operate at a centre frequency of 1.8 GHz with an absolute bandwidth of 65 MHz. The measured and computed results are in good agreement.

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“…Small cell base stations with a low-medium power output typically rely on low-cost and low volume filters and diplexers due to the increased need for miniaturisation and integration with the rest of the TRX circuitry. Usually, such filters come in the form of ceramic-filled coaxial transversal electro-magnetic (TEM) filters or ceramic waveguides, depending on the required performance level [1][2]. However, the compact size of such devices comes at the cost of reduced performance, due to the losses of the ceramic materials.…”

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confidence: 99%

Ceramic‐elements‐based distributed resonators and filters

Bulja¹,

Claußen²,

Kozlov

et al. 2021

Electronics Letters

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The aim of this paper is to introduce a new family of low-profile resonators and filters that achieve high performance and low insertion loss without the need for post-production tuning. The new resonator is termed ceramic-element based distributed resonator and consists of a matrix of subwavelength-length ceramic posts connected in the interdigital fashion to the top and bottom ground planes. Such a disposition of elements is beneficial for two main reasons. First, the frequency of operation of such a resonator becomes a function of its height, unlike in the case of standard ceramic resonators. Second, the ceramic element matrix performs inherent dimensional averaging, resulting in a filter that requires no post-production tuning. As a demonstrator of the proposed technology, a two-pole filter using a ceramic with a dielectric permittivity of 37 and a loss tangent of 0.0033 and operating at a centre frequency of 3.5 GHz was designed, fabricated and tested. The measured and predicted results are in excellent agreement and are extensively discussed.

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Design of Comb-Line Band-Pass Filters (Correspondence)

Cited by 27 publications

References 6 publications

Miniaturisation of combline filters for switched-mode power amplifier systems

Miniaturisation of combline filters for switched-mode power amplifier systems

Multi‐layered PCB distributed filter

Ceramic‐elements‐based distributed resonators and filters

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