Realization of Even Transmission Zeros for Filter Without Cross-Couplings

Zhang, Tianliang; Long, Zhihe; Zhou, Liguo; Qiao, Man; Hou, Fangyan; Tian, Mingen

doi:10.1109/tmtt.2018.2871140

Cited by 25 publications

(11 citation statements)

References 44 publications

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“…Finally, it must be emphasized that the design approach proposed here represents the first analytical solution for the class of filters considered. Indeed, previous works dealing with this topology [16] address the synthesis of the low-pass prototype using optimization techniques. We are currently working on the extension of the path filters synthesis to a larger number of transmission zeros (not necessarily symmetric).…”

Section: Discussionmentioning

confidence: 99%

A True Inline Coaxial-Cavity Filter With Two Symmetric Zeros

Tamiazzo¹,

Macchiarella

Seyfert

2021

IEEE Microw. Wireless Compon. Lett.

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This work deals with the design of true inline filters with two symmetric transmission zeros. A new filters category named "path filters" is introduced (including the considered filters), his general features are discussed and analyzed and a general method for the synthesis of the low-pass prototype network is proposed. To validate the proposed design approach, a coaxial-cavity filter with a true inline topology exhibiting two symmetrical transmission zeros has been designed and fabricated. The realized prototype shows a response in good agreement with the theory.

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Section: Discussionmentioning

confidence: 99%

A True Inline Coaxial-Cavity Filter With Two Symmetric Zeros

Tamiazzo¹,

Macchiarella

Seyfert

2021

IEEE Microw. Wireless Compon. Lett.

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“…In this manuscript, in order to improve the out‐of‐band rejection at 5.85 GHz, a capacitance

C_{4}

is added between the input port and resonator 2. The topology of the original filter with

C_{4}

added is shown in Figure 2B, and its corresponding normalized coupling matrix is calculated and optimized by Keysight ADS, 13 as depicted in Figure 2C. In Figure 2B, S and L present the input source port and output load port.…”

Section: Filter Designmentioning

confidence: 99%

On‐chip miniaturized bandpass filter using gallium arsenide‐based integrated passive device technology

Yuan

Zhao

et al. 2022

Micro & Optical Tech Letters

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The paper proposes a miniaturized bandpass filter (BPF) using gallium arsenide (GaAs)‐based integrated passive device (IPD) technology. The proposed filter is evolved from traditional third order BPF, and it achieves a wide operation frequency band covering three 5G sub‐bands including 3.4–3.5 GHz, 3.5–3.6 GHz, and 4.8–4.9 GHz. The performance of out‐of‐band rejection is improved by introducing three transmission zeros (TZs). As known, adding cross coupling and LC resonator are the general methods to improve out‐of‐band rejection. Therefore, the first TZ at 5.85 GHz is obtained at the upper sideband by adding a capacitive coupling between the source port and resonator 2, which is a cross‐coupling mode. According to the coupling matrix, the value of the added capacitance can be calculated and optimized. Another TZ at 2.36 GHz is occurred at the left side of passband as a serial LC resonator is connected in parallel with filter near the input port. The third TZ at 7.74 GHz is generated at the upper sideband due to a serial LC resonator connected in parallel with the load terminal of the filter. The values of components in LC resonators can be calculated, too. Finally, the whole filter is optimized in full‐wave electromagnetic simulation software HFSS. The proposed filter is fabricated and measured, and the results show that it has a wide −10 dB frequency band from 3.3 GHz to 4.9 GHz and a maximum insertion loss of 2.5 dB. In addition, it has a good frequency selectivity with a rectangular coefficient of 1.67 and out‐of‐band suppression higher than 20 dB in a wide stopband. The filter adopts compact placement and has a relative miniaturized electrical size of 0.298 λ02, which is about 55% smaller than recently reported one.

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“…This work is focused on a new category of true inline filters recently proposed, namely the path filters [17]- [18]. The main advantage of this type of inline filter is that its implementation does not require special components.…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, the design of path filters exhibiting the Generalized Chebyshev characteristic with assigned transmission zeros is allowed only for a specific set of transmission zeros and the passband return loss (RL) cannot be assigned freely [18]. The first proposed approach to the design of path filters is based on the optimization of the coupling matrix [17]. More recently, a method for the analytical synthesis of symmetric path filters is presented in [18].…”

Section: Introductionmentioning

confidence: 99%

Path Filters: A Class of True Inline Topologies With Transmission Zeros

Tamiazzo¹,

Macchiarella

Seyfert

2022

IEEE Trans. Microwave Theory Techn.

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In this paper we present a comprehensive discussion of a new class of inline microwave filters with transmission zeros in the response, namely the path filters. The main features of this filters class are highlighted, and an original (synthesis-based) design approach is presented, relying on the derivation of suitable characteristic polynomials. In addition to the classical Generalized Chebyshev characteristic, two new characteristics are introduced (namely the Bounded Chebyshev and the Reduced Chebyshev), that allow improving the flexibility in the requirements assignment of path filters. A new method for the synthesis of the lowpass prototype is also introduced, that overcome the limitation in the classical synthesis based on the manipulation of the transversal prototype (whose synthesis may fail in case of path filters). Finally, the proposed approach for designing the class of considered filters has been validated by several examples that include the evaluation of the characteristic polynomials, the prototype synthesis and the dimensioning of the physical structures in waveguide technology.

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Realization of Even Transmission Zeros for Filter Without Cross-Couplings

Cited by 25 publications

References 44 publications

A True Inline Coaxial-Cavity Filter With Two Symmetric Zeros

A True Inline Coaxial-Cavity Filter With Two Symmetric Zeros

On‐chip miniaturized bandpass filter using gallium arsenide‐based integrated passive device technology

Path Filters: A Class of True Inline Topologies With Transmission Zeros

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