An Active Ring Slot With Rf Mems Switchable Radial Stubs for Reconfigurable Frequency Selective Surface Applications

Abstract

Abstract-An active ring slot resonator loaded by switchable radial stubs is investigated. It is shown that this element can be used as the unit cell of a switchable reconfigurable frequency selective surface (RFSS). Equivalent circuit and full-wave mathematical models are obtained to evaluate the reflection characteristics of the RFSS based on this element. The possibility to obtain different resonant transmission frequencies is discussed. The mathematical model developed is used to design an X band RFSS capable of obtaining resonant frequencies at 9.65, 10.28, 10.83 and 12.05 GHz. Commercially available RF MEMS switches are used to evaluate the effect of the off-state capacitances over the response of the periodic structure. To validate the numerical simulation results, different active and passive diaphragms were designed, fabricated, and tested using the waveguide simulator. A good agreement between numerical and measured results was found.

Directional Coupler With Good Restraint Outside the Passband and Its Frequency-Agile Application

“…It also recommends an effective way to avoid the performance degradation due to a cascade connection of two individual components. On the other hand, a number of reconfigurable microwave components, including frequencyagile couplers, have received significant attention because of their selectable fundamental characteristics [7][8][9][10][11][12]. Therefore, we hope to propose and design a 90-degree frequency-agile directional coupler incorporating with the filter's selectivity at each operation frequency band.…”

Waveguide Filter Using Frequency Selective Surface With Miniaturized Element

“…For about 50 years, FSSs have been an attractive topic because of their comprehensive applications, such as filters, absorbers, polarizers, subreflectors, hybrid-radome for radar cross-section (RCS) controlling, etc. [3][4][5][6][7][8][9][10][11][12][13][14][15]. For decades, many novel FSS structures have been proposed to design FSSs with excellent performances.…”

A Second-Order BPF Using a Miniaturized-Element Frequency Selective Surface

“…A typical FSS structure consists of an array of patches printed on a thin dielectric layer [2][3][4]. The transmit-and reflect-band frequencies depend on the patch and unit cell size.…”