A Synthesis-Based Design Procedure for Waveguide Duplexers Using a Stepped E-Plane Bifurcated Junction

Macchiarella, Giuseppe; Gentili, Gian Guido; Accatino, L.; Crestvolant, Vittorio Tornielli di

doi:10.1109/ims30576.2020.9223923

Cited by 5 publications

(2 citation statements)

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“…This structure allows the transmission zeros placement very close to the passband without degrading too much the unloaded Q of the adjacent cavities (as it happens with the previously mentioned discontinuities implementing FDC in waveguide technology). To this regard, it must be observed that resonant couplings strongly interact with the adjacent resonators, modifying both the slope parameter and the unloaded Q of these resonators [80]. Consequently, the filter design may become very difficult (if not impossible) when the parameters produced by the synthesis of the filter equivalent circuit are not compatible with the constraints imposed by the resonators' technology and the electrical requirements (e.g., the transmission zeros position).…”

Section: Frequency-dependent Couplingsmentioning

confidence: 99%

Emerging Trends in Techniques and Technology as Applied to Filter Design

et al. 2021

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In the last decade, the filter community has innovated both design techniques and the technology used for practical implementation. In design, the philosophy has become "if you can't avoid it, use it", a very practical engineering approach. Modes previously deemed spurious are intentionally used to create in-line networks incorporating real or imaginary transmission zeros and also reduce the number of components and thus further miniaturize; spurious responses are re-routed to increase the passband width or stopband width, frequency variation in couplings is used to create complex transfer functions, with all of these developments using what was previously avoided. Clever implementations of baluns into passive and active networks is resulting in a new generation of noise-immune filters for 5G and beyond. Finally, the use of a diakoptic approach to synthesis has appeared an evolving approach in which small blocks ("singlets", "doublets", etc.) are cascaded to implement larger networks, (reducing the need for very complex synthesis), with this new approach promising a large impact on the implementation of practical structures. Filter technology has migrated towards "observe it and then adapt it", pragmatically repurposing tools not specifically originally intended for the applications. Combinations of surface wave and bulk wave resonators with L-C networks are improving the loss characteristics of filters in the region below 2 GHz. Lightweight alloys and other materials designed for spacecraft are being used in filters intended for space, to provide temperature stability without the use of heavy alloys such as Invar. Fully-enclosed waveguide is being replaced in some cases by planar and quasiplanar structures propagating quasi-waveguide modes. This is generically referred to as SIW (Substrate Integrated Waveguide). Active filters trade noise figure for insertion loss but perhaps will offer advantage in terms of size and chip-level implementation. Finally, the era of reconfiguration might be approaching, as the basic networks are evolving, perhaps lacking only the appearance of lower-loss, higher-IP solid-state tuning elements.

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Section: Frequency-dependent Couplingsmentioning

confidence: 99%

Emerging Trends in Techniques and Technology as Applied to Filter Design

et al. 2021

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“…One is usually based on optimizing an error function, which is a time-consuming process [5,6], and the other is analytical methods based on the design of two separate filters and a coupling matrix [7,8]. The fabrication methods of diplexers are based on printed circuit technology [7][8][9][10][11] and waveguides [12,13]. In [10], an input reflectionless low-pass filter was presented, which consists of a reflective network implemented with a microstrip resonator and a resistive termination, and in [8], a switchable diplexer was presented by using pin diodes.…”

Section: Introductionmentioning

confidence: 99%

A Novel Surface Wave Diplexer Based on Tensor Impedance Surfaces

Mighani¹

2022

PIER C

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In this paper, a new Surface Wave (SW) diplexer in frequency bands of 11.6 GHz and 19.3 GHz is presented based on the frequency variations of the refractive angle when an SW enters from a Scalar Impedance Sheet (SIS) to a Tensor Impedance Sheet (TIS). In this structure, a SIS has been placed alongside a TIS, and using three launchers, SW is excited and received on them. To achieve an SW diplexer, the structure is designed in a way that the refractive angle changes in the expected range when SW enters from SIS to TIS. Finally, the proposed structure is fabricated and measured by printed circuit technology. The measurement results at 11.6 GHz and 19.3 GHz show that this structure has 3.6 dB and 4.1 dB insertion losses and 33.5 dB and 37 dB isolations in the two bands, respectively. These measurements are in good agreement with mathematical modelling and simulations.

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