Abstract
A novel broadband bi-mode active frequency selective surface (AFSS) is presented in this paper. The proposed structure is composed of a periodic array of convoluted square patches and Jerusalem Crosses. According to simulation results, the frequency response of AFSS definitely exhibits a mode switch feature between band-pass and band-stop modes when the diodes stay in ON and OFF states. In order to apply a uniform bias to each PIN diode, an ingenious biasing network based on the extension of Wheatstone bridge is adopted in prototype AFSS. The test results are in good agreement with the simulation results. A further physical mechanism of the bi-mode AFSS is shown by contrasting the distribution of electric field on the AFSS patterns for the two working states.
Highlights
With the sharp increment of the quantity of wireless devices, such as smartphone and Tablet PC, much attention is paid to the notion of Electromagnetic Architecture of building (EAoB)
In Refs. 9–12, both the PIN diodes and passive band-pass frequency selective surface (FSS) structure are mounted in one side of bearing substrate, and an additional bias circuit is needed in the other side of substrate in order to control the states of diodes
To better understand the physical mechanisms of the bi-mode active frequency selective surface (AFSS), the electric field distribution on the AFSS patterns for ON and OFF states at 2.45GHz under normal incidence are respectively represented in Fig. 9(a) and Fig. 9(b)
Summary
With the sharp increment of the quantity of wireless devices, such as smartphone and Tablet PC, much attention is paid to the notion of Electromagnetic Architecture of building (EAoB). To achieve reconfigurable EAoB, the active frequency selective surface (AFSS) is preferred to use in this field, because of its artificially controllable electromagnetic properties. A novel broadband bi-mode AFSS structure working at the WLAN band of 2.45GHz for TE and TM polarizations is presented. This structure consists of a periodic array of convoluted square patches and Jerusalem Crosses, with two adjacent Jerusalem Crosses connected to each other by a PIN diode. The test results in agreement with the simulations prove the fact that the broadband bi-mode switch of AFSS can be achieved by controlling the states of PIN diodes, opening up an opportunity for many practical applications, such as radar stealth, telecommunication and antennas design
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