Frequency‐selective substrate integrated waveguide front‐end system for tracking applications

Abstract

A K-band frequency-selective front-end system for monopulse tracking applications is presented on a single layer of a substrate-integrated waveguide (SIW). The circuit comprises an antenna array of two Vivaldi antennas, a frequency-selective power combiner, and two frequency-selective SIW crossovers, which eliminate the need for subsequent filtering. Its performance is demonstrated in terms of sum and difference patterns, gain, and scattering parameters. In order to validate the design procedure, the monopulse tracking front end is fabricated and measured. It has a bandwidth of 540 MHz with an operating frequency range of 23.63-24.17 GHz. The sum and difference patterns are provided by in-phase and out-of-phase electric fields. The maximum achievable gain is 6.2 dB at the mid-band frequency, and a 30-degree field of view is obtained. The measurements are found to be in good agreement with simulations.

Design of a SIW Variable Phase Shifter for Beam Steering Antenna Systems

“…An antipodal Vivaldi antenna is employed as the radiating element for this antenna system. It is designed based on the parametric study in [24], and then fine optimized [25] for performance in the required frequency band of 16 GHz to 18 GHz. The Vivaldi antenna is horizontally polarized, and vertical polarization is blocked by the comb-like corrugations on two arms of the antenna.…”

Antipodal Vivaldi Antenna Arrays Fed by Substrate Integrated Waveguide Right-Angled Power Dividers

“…A combination of coplanar waveguide and SIW is introduced for feeding a surface micro machined Vivaldi antenna with circularly shape load [10]. Reference [11] proposed an antenna system comprising two Vivaldi divider system provides dual-beam and single-beam performances in the lower and higher frequency range, respectively. For measurement purposes, all three systems include at their input ports a microstrip-to-SIW transition and coaxial connector which are included in the simulation process.…”

“…Figure11. Measured and simulated reflection coefficient and gain of H-plane SIW antenna array with two-way out-of-phase power divider including the s-parameters of the power divider at both ports.…”