1,720,971 research outputs found
Tunable SIW Cavity Backed Active Antenna Oscillator
No full textA substrate integrated waveguide (SIW) cavity backed active slot antenna oscillator is proposed, the operation frequency of which can be tuned by means of a properly connected varactor. The cavity backed structure permits overcoming potential problems such as heat dissipation and unwanted surface wave modes in large array implementations, and may provide better phase noise performance. The use of SIW technology permits a cost-effective fabrication process and simple implementation at millimetre-wave frequency, for radar and communication applications. Full-wave FEM-based analysis is used for the design of the radiating structure, while harmonic balance and transient simulations are employed in the design of the active antenna oscillator and in the study of the stability of its steady-state solutions. Tunable active antenna prototypes have been implemented and measured
Active Substrate Integrated Waveguide (SIW) Antenna with Phase-Shifterless Beam-Scanning Capabilities
No full text
A Compact, Single-Layer Substrate Integrated Waveguide (SIW) Cavity-Backed Active Antenna Oscillator
No full textThis letter presents the design and implementation of a single-layer, cavity-backed antenna oscillator based on substrate integrated waveguide (SIW) technology. The proposed antenna topology is particularly suitable for two-dimensional array configurations. The active circuit and the radiator are placed on opposite sides of the substrate and within the cavity area, allowing for a compact implementation. An X-band prototype was designed and fabricated, and it features frequency-tuning capability introduced by employing a varactor diode in the active circuit. The measurements showed 11.87-12.36 GHz tuning range, phase noise better than -107 dBc/Hz at 1 MHz offset, and 7% DC-to-RF conversion efficiency.</p
A study of a reflectarray topology based on coupled oscillator arrays using Substrate Integrated Waveguide technology
No full textThis paper presents the design of a reflectarray based on coupled oscillators, whose elements are active cavity-backed antenna oscillators. The cavity backed topology, implemented in Substrate Integrated Waveguide (SIW) technology, allows for a compact, single substrate implementation, and provides a means for the suppression of the undesired surface-wave modes and for heat dissipation. The coupling between adjacent oscillator elements in the array can be controlled by properly coupling their cavities, thus allowing for the implementation of power combining and beam scanning capabilities. A small prototype of a linear reflectarray of seven elements is designed by properly combining full-wave EM simulation for the radiating structure and nonlinear Harmonic Balance (HB) and transient analysis for the optimization of the oscillators and the study of the stability of its steady-state solutions.</p
A Tolerance Study on 30 GHz Planar Filters based on Substrate Integrated Waveguide Technology
No full text
- …
