Ultra Wide Band Response of an Electromagnetic Wave Shield Based on a Diode Grid

Abstract

Abstract-This paper investigates Ultra Wide Band (UWB) response of a self-actuated electromagnetic wave shield based on a diode grid both in frequency and time domain. The investigation is first carried out on a shield valid for an incident wave polarized at a specific direction only, then extended to a shield effective for an incident wave polarized at an arbitrary direction. In the frequency domain, two linear analysis methods are used to study the properties of the diode grid over the frequency range from 0.01 to 10 GHz. One method is the microwave network analysis. Another is simulating the diode grid by a linear equivalent circuit instead of a diode. In the time domain, the property of the shield is studied with respect to a broadband impulse, where the diode is described by its SPICE circuit model including the nonlinear property. The results show that the diode grid works well as a self-actuated electromagnetic power selective surface (PSS) in a certain frequency range. The diode grid is strongly frequency dependent. The operating frequency band relies on the reactive elements in the diode grid. In order to extend the operating frequency to a high band, smaller cell size and smaller junction capacitance should be employed.

Design and Simulation of an Improved Energy Selective Surface

“…So the conductor cross patch is more suitable for constructing ESS. The property of diode loaded conductor cross patch with arbitrary polarization direction can be estimated by studying the rectangle patch with diode loaded only valid for an incident wave at a specific polarization direction [16]. So the unit cell of ESS can be simplified to the structure shown in Figure 1.…”