1,720,986 research outputs found
High-yield E-band diplexer for fixed radio point-to-point equipment
No full textThe article describes practical guidelines for an E-Band tuning-less waveguide diplexer design (71-86 GHz) which requires looser fabrication tolerances and provides higher yield than traditional methods. Physical considerations concerning sensitivity to manufacturing inaccuracies are discussed and proven by designing and manufacturing two different diplexers on a set of typical specifications. © 2013 Wiley Periodicals, Inc
Cheap method for accurate characterization of orthomode transducers
No full textThe paper presents an original method for the precise charaterization of orthomode transducers with special focus to their isolation figures. This technique is based on 6 two-port measurements, 4 of which are already traditionally used to obtain approximate estimates of the scattering parameters. Unlike direct measurements or other techniques, the components required by the proposed procedure are commonly available in a standard RF laboratory thus allowing precise characterization of manufactured prototypes with cheap hardware
E-band Radio Fiber as Low-Cost mm- Wave Waveguide Junction
No full textNext generation mm-wave communications foresee to heavily rely on higher frequency bands, such as the E- and D-bands. At these frequencies, novel transmission line technologies can emerge and the confinement properties of a cylindrical dielectric rod look indeed attractive to realize short mm-wave junctions or moveable joints. This paper investigates the possibility of a Plexiglas-based radio fiber for the aforementioned purposes. The described design flow is based on the well-known optical fiber theory to assess the guided modes, their cut-off frequency and their shapes. This manuscript reports also the experimental results of three E-band radio fiber junctions and their propagation characteristics
Substrate Integrated Waveguide Components on Alumina for E-band Applications
No full textThis manuscript presents a set of Substrate Integrated Waveguide components realized through thin-film technology and suitable for E-band applications. The non-standard choice of alumina as dielectric material leads to superior performance and increases the operational frequency of such devices, usually limited by fabrication tolerances. The intrinsic fragility of the ceramic substrate is mitigated through ad-hoc design rules which limit the via-hole density while the higher dielectric constant allows a small die size, with clear advantages in stiffness and handling robustness. Three components have been designed, manufactured and tested: a straight interconnection, a matched load, and a three-pole in-line band pass filter. All the devices show interesting performance across the 70-80 GHz spectrum portion
Synthesis-Based Design of Quasi-Inline Filters With Strongly Coupled Resonators Quadruplets
No full textA comprehensive design procedure for quasi-inline filters using strongly coupled resonator quadruplets (SCRQs) is presented in this article. Just recently proposed, the SCRQ is a novel building block structure that allows for the generation of two transmission zeros and three passband poles in the response of microwave filters. This block belongs to the category of strongly coupled resonators, whose adoption has the following advantages: 1) reduced overall filter size (quasi-inline configuration can be realized) and 2) avoids the usage of capacitive couplings (only positive couplings are required). After a brief summary recalling the concept behind the working principles of the SCRQ, a suitable model for this new block is introduced, which is then used in an original synthesis procedure of higher order filters composed by an arbitrary number of cascaded SCRQs. In addition to several numerical synthesis examples, the design technique here introduced is validated through a manufactured prototype exhibiting a response with 11 poles and four transmission zeros
Phased Array Design for Bounded-Power Consumption Onboard Spacecraft
No full textThis manuscript presents a technique to perform the initial design of a transmitting phased array in order to provide a given EIRP within a prescribed scan angle while limiting the overall power consumption. Such constraints are typically found in commercial Earth-observation satellite missions. The paper discusses a closed-form approach yielding the optimum number of elements and power capabilities of each transmitting element, from which the antenna elements and the overall array size can be then obtained. A numerical simulated example is provided to support this simple technique
Filtennas in Space: A Novel Approach for Radio-Frequency Interference Mitigation
No full textThe coexistence of wireless transmitters for downlink communications and radio sensing instruments onboard spacecraft poses severe challenges concerning electromagnetic compatibility. Among the possible solutions, the chance to integrate complex filtering functions into the antenna devoted to data transmission offers a space-effective way to improve isolation by suppressing out-of-band emissions. The present manuscript describes the flexibility given to satellite integrator by using the filtenna paradigm, as well as a complete description on possible designs and trade-offs. As example, a horn filtenna for Ka band is also numerically proven and mechanical designed
De-embedding of filters in multiplexers via rational approximation and interpolation
No full textIn this article, we present a method to recover electrical parameters of filters embedded in a multiplexer for which scattering measurements are given. Unlike other approaches proposed for this problem, this method does not require a priori knowledge of the scattering parameters of the junction. This feature renders the procedure well suited for tuning purposes or for fault diagnosis. Technically, the algorithm starts with a rational approximation step, to derive a rational representation of certain scattering parameters of the multiplexer. This representation is then used in a second step to identify an electrical model of each filter. This second step relies on a rational interpolation technique used to extract the filter's responses
System identification of microwave filters from multiplexers by rational interpolation
No full textMicrowave multiplexers are multi-port structures composed of several two-port filters connected to a common junction. This paper addresses the de-embedding problem, in which the goal is to determine the filtering components given the measured scattering parameters of the overall multiplexer at several frequencies. Due to structural properties, the transmission zeros of the filters play a crucial role in this problem, and, consequently, in our approach. We propose a system identification algorithm for deriving a rational model of the filters’ scattering matrix. The approach is based on rational interpolation with derivative constraints, with the interpolation conditions being located precisely at the filters’ transmission zeros
Passive Networks for C-Band Multi-Carrier Wireless Backhaul Systems
No full textThis paper presents an overview of the passive components involved in multi-carrier single-antenna wireless backhauling systems, dedicated to enhancing data throughput for 5G deployment across the C-band. Three passive devices are the core building blocks for the presented configurations, all sharing the metallic hollow waveguide technology. The description and the design-to-manufacturing workflow is reported for a balanced coupler, a circulator, and an orthomode transducer. The required specifications together with measured data are reported for all the aforementioned devices
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