Implementation of four‐element linear arrays using microstrip‐coupled cylindrical dielectric resonator antennas

Two four-element linear broadside arrays, shaping the Eθ- and Eϕ-field components, using microstrip-coupled cylindrical dielectric resonator antennas are reported. The resonant frequency, radiation pattern, gain, unloaded Q-factor, and impedance bandwidth of each array configuration are investigated. It is concluded that microstrip coupling is an efficient, simple, and easy to implement feeding scheme. An important benefit is that critical coupling can be obtained by simply varying the position of the CDRA with respect to the microstrip line. Overall, good agreement was obtained between theoretical and experimental results, with the numerical values being more accurate than the analytical data.