Design of Hybrid Folded Rectangular Waveguide Filters With Transmission Zeros Below the Passband

Carceller, Carlos; Soto, Pablo; Boria, Vicente E.; Guglielmi, M.

doi:10.1109/tmtt.2015.2510644

Cited by 24 publications

(14 citation statements)

References 14 publications

(22 reference statements)

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“…Two new families of low-loss high-power bandpass filters have been recently proposed, which are suitable for this particular application [19]. They are the Hybrid Folded Rectangular Waveguide (HFRW) filters [21], [22] and the Modified Hybrid Folded Rectangular Waveguide (MHFRW) filters [23].…”

Section: A Transmission Filtersmentioning

confidence: 99%

“…On the other hand, the MHFRW can generate one TZ for each coupling window (tuned by the stub created by the resonator location), thus allowing a higher number of TZs for the same filter order [23]. An advantage of the HFRW configuration is that the TZ can be placed very close to the filter passband [22]. For the MHFRW configuration, and in the cases where the coupling window must also provide a strong direct coupling, this is only possible for higher order resonators (i.e., TE 102 or above) [23].…”

Section: A Transmission Filtersmentioning

confidence: 99%

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Advanced Compact Setups for Passive Intermodulation Measurements of Satellite Hardware

Smacchia

Soto

Boria

et al. 2018

IEEE Trans. Microwave Theory Techn.

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This paper provides the guidelines for the practical development of novel advanced test beds for passive intermodulation (PIM) measurements. The proposed test beds are highperformance and flexible, allowing for the measurement of several PIM signals of different orders, with two or more input carriers. In contrast to classic test beds for satellite hardware, based on the cascaded connection of several elements, an integrated solution involving the minimum number of hardware pieces is proposed. The result is a lower number of flanged interconnections thus reducing residual PIM level and insertion losses. In addition, return loss degradation and harmful spurious generation in the interconnections are also avoided. Measurement test beds for conducted and radiated PIM, in both transmitted and reflected directions, are discussed, highlighting the benefits and drawbacks of each configuration. Design guidelines for the key components are fully discussed. Illustrative application examples are also reported. Finally, excellent experimental results obtained from low-PIM measurement setups, working from C band to Ka band, are shown, thus fully confirming the validity of the proposed configurations. Index Terms-Intermodulation distorsion, microwave filters, high-power filters, multiplexing, computer-aided engineering. I. INTRODUCTION I N the last decades, the avoidance of passive intermodulation effects (PIM) has become a top-priority issue for communication satellites systems engineers, as a consequence of the ever more demanding payload requirements [1], [2]. PIM may, in fact, become an important source of performance degradation due to increased transmitted power levels for higher capacity links, together with the need for simultaneous operation in transmission (downlink) and in reception (uplink) at different frequency bands [3], [4]. In the scenario of Manuscript

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Section: A Transmission Filtersmentioning

confidence: 99%

Section: A Transmission Filtersmentioning

confidence: 99%

Advanced Compact Setups for Passive Intermodulation Measurements of Satellite Hardware

Smacchia

Soto

Boria

et al. 2018

IEEE Trans. Microwave Theory Techn.

Self Cite

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“…Very recently, an analytical approach has been proposed to accurately obtain their final physical dimensions using exclusively closed-form expressions [7]. As far as the authors' knowledge, all efforts to fold waveguide filters have kept focused on band-pass filters [8,9]. In the case of low-pass filters, all of them follow the same in-line topology as in [7], and, typically, if a classical corrugated low-pass filter with embedded bends is required, its frequency response is retrieved by brute-force optimization of the constituent physical parameters, using only the optimizer tool of an electromagnetic software (i.e., FEST3D for instance).…”

Section: Introductionmentioning

confidence: 99%

Routing With Classical Corrugated Waveguide Low-Pass Filters With Embedded Bends

Teberio¹,

Percaz²,

Arregui³

et al. 2018

PIER Letters

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Abstract-A very simple design method to embed routing capabilities in classical corrugated filters is presented in this paper. The method is based on the calculation of the heights and lengths of the so-called filters design building blocks, by means of a consecutive and separate extraction of their local reflection coefficients along the device. The proposed technique is proved with a 17th-order Zolotarevfilter whose topology is bent twice so that the input and output ports are in the same plane while preserving the in-line filters behaviour. This new filter allows the possibility of eliminating subsequent bending structures, reducing the insertion loss, weight, and PIM.

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“…The common feature of all the above structures is that they all have a symmetry in the H-plane and, therefore, the main current lines are broken when they are manufactured following the standard procedure in two halves, which deteriorates the measured insertion loss and PIM [18]. Recently, folded BPFs with E-plane symmetry have been proposed [18]- [20]. In [18] and [19], a folded topology was presented as a flexible alternative to implement trisections.…”

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confidence: 99%

“…In [18] and [19], a folded topology was presented as a flexible alternative to implement trisections. Then, the technique in [18] was extended to implement transmission zeros above and below the passband [20]. Although very high-performance structures can be obtained with the above methods, they might not be suitable for the design and manufacture of tuning-less inexpensive filters with stringent specifications for the emerging Q-V-bands (assuming standard milling as the fabrication technique) since they all use coupled resonant cavities to obtain the desired frequency response.…”

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confidence: 99%

Rectangular Waveguide Filters With Meandered Topology

Teberio

Percaz

Arregui

et al. 2018

IEEE Trans. Microwave Theory Techn.

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In this paper, a new topology for rectangular waveguide band-pass and low-pass filters is presented. A simple, accurate and robust design technique for these novel meandered waveguide filters is provided. The proposed filters employ a concatenation of ±90º E-plane mitered bends (±90ºEMBs) with different heights and lengths whose dimensions are consecutively and independently calculated. Each ±90ºEMB satisfies a local target reflection coefficient along the device so that they can be calculated separately. The novel structures allow to drastically reduce the total length of the filters and to embed bends if desired, or even to provide routing capabilities. Furthermore, the new meandered topology allows the introduction of transmission zeros above the passband of the low-pass filter, which can be controlled by the free parameters of the ±90ºEMBs. A band-pass and a low-pass filter with meandered topology have been designed following the proposed novel technique. Measurements of the manufactured prototypes are also included to validate the novel topology and design technique, achieving excellent agreement with the simulated results.

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Design of Hybrid Folded Rectangular Waveguide Filters With Transmission Zeros Below the Passband

Cited by 24 publications

References 14 publications

Advanced Compact Setups for Passive Intermodulation Measurements of Satellite Hardware

Advanced Compact Setups for Passive Intermodulation Measurements of Satellite Hardware

Routing With Classical Corrugated Waveguide Low-Pass Filters With Embedded Bends

Rectangular Waveguide Filters With Meandered Topology

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