Young-Min Yoon

A Linear Phased Array Antenna Composed of Inductive Loaded Patch Antennas

Radiation characteristics of an inductive loaded patch phased array antenna (PAA) are compared to those of a conventional patch PAA. The performance of an inductive loaded patch PAA is significantly improved compared to that of a conventional patch PAA because the mutual coupling between the adjacent inductive loaded patch antennas is very small compared to that between the adjacent conventional patch antennas. The radiation characteristics of an inductive loaded patch PAA show superior performance such as low variations of the main beam gain and sidelobe level over the variation of the main beam direction.

Effect of Edge Reflections on the Mutual Coupling of a Two-Element Linear Microstrip Patch Antenna Array Positioned Along the E-Plane

Mutual coupling of a two-element linear microstrip patch antenna array positioned along the E-plane including the effect of edge reflections is investigated by the experiment and full-wave simulation. The optimum substrate sizes calculated by the simple formulas using geometrical optics are in good agreement with those obtained by the experiment and full-wave simulation. Experimental results show that the effect of edge reflections on the mutual coupling of microstrip patch antennas is mainly determined by the effective dielectric constant for surface waves on a grounded dielectric substrate.

Estimation of the Substrate Size with Minimum Mutual Coupling of a Linear Microstrip Patch Antenna Array Positioned Along the H-Plane

Mutual coupling between antenna elements of a linear microstrip patch antenna array positioned along the H-plane including the effect of edge reflections is investigated. Simple formulas are presented for the estimation of the grounded dielectric substrate size with minimum mutual coupling. The substrate sizes calculated by these formulas are in good agreement with those obtained by the full-wave simulation and experimental measurement. The substrate size with minimum mutual coupling is a function of the effective dielectric constant for surface waves and the distance between the antenna centers. The substrate size with minimum mutual coupling decreases as the effective dielectric constant for surface waves on a finite grounded dielectric substrate increases.

Radiation characteristics of an H-plane linear microstrip array antenna on a finite substrate

The effect of the finite grounded substrate size on the radiation characteristics of an H-plane linear microstrip array antenna on a high dielectric constant substrate is investigated. The radiation pattern characteristics of the array antenna versus scan angle are strongly influenced by the diffracted fields of surface waves from the substrate edge on the E-plane. The distance between the antenna center and the substrate edge on the E-plane for the enhancement of the radiation characteristics of the array antenna is presented.

Radiation characteristics of an E-plane linear inductive loaded patch phased array antenna

Radiation characteristics of linear 5-element phased array antennas (PAAs) equidistantly positioned along the E-plane composed of 5×2 inductive loaded patch antennas (ILPAs) are measured and compared to those of a linear PAA composed of conventional patch antennas. The radiation characteristics of linear PAAs composed of ILPAs are significantly improved compared to those of a linear PAA composed of conventional patch antennas such as low variations of the main beam gain and side-lobe level over wide scan angle range.

Optimum substrate size for radiation pattern of an H-plane coupled linear microstrip patch antenna array

Radiation characteristics of an H-plane coupled linear microstrip phased array antenna on a finite grounded dielectric substrate with high dielectric constant are investigated. When the H-plane coupled microstrip antenna arrays has an optimum substrate size with the minimum mutual coupling, the broadside gain is significantly improved and the effect of the mutual coupling on radiation patterns is minimized. The excellent radiation performances such as higher main beam gain over the entire scanning range and very low SLL less than -10 dB in the scanning range from -35° to 45° are obtained from the measured results of a 5-element H-plane coupled linear microstrip patch antenna array.