Resonant circular patch microstrip antenna with air gap
The resonant frequency and bandwidth characteristics of superstrate loaded air gap tuned circular patch microstrip antenna are investigated for different structural parameters. The problem is formulated in spectral domain and Galerkin's method is used for the solution. It is shown that adjustable air gap between the ground plane and substrate compensates superstrate loading effect on the resonant frequency, increases bandwidth and provides tunable operational characteristics.
Circular-disk microstrip antenna with an air gap
The circular-disk microstrip antenna with an air gap between the substrate and the ground plane is analyzed using the cavity-model theory. A simple formula for the resonant frequencies is obtained. The internal fields, the radiation fields, the effective loss tangent, and the input impedance are derived when the antenna is provided with a coaxial feed. The theory predicts that the air gap does not alter the relative field patterns significantly but it provides a simple parameter by which the resonant frequencies of the antenna can be tuned. Measurements have been performed on a 5 cm circular-disk microstrip antenna with an air gap and good agreement between theory and experiment is obtained.
When enough is too much: Communication apprehension and employee information experiences
This study examines the relationships between supervisor communication apprehension, employee communication apprehension, and employees' reports of information received from their supervisor. Results indicated that supervisor communication apprehension was negatively related to employees' reports of information received. Employee communication apprehension and employees' reports of information received from supervisors were not significantly related. Supervisor communication apprehension was negatively related to the information load reported by employees. Finally, a positive relationship was identified between employee communication apprehension and the information load reported by employees.