The fabricated switches have exactly the same membrane dimensions and with a fixed length of CL of 25 m, while the AP is varied from 0.5 to 2.0 mm. For performance comparison, a regular capacitive switch with the same dimension was also fabricated simultaneously on the same substrate.The measurements were performed with an HP 8510C network analyzer connected to a Cascade probe station. Isolations of the switches were recorded over the frequency range of 0.1-10 GHz as shown in Figure 7. The regular switch has only 5-dB isolation at 3.1 GHz, while the asymmetric switch with AP ϭ 2 mm has 30 dB-isolation. For the other two cases the isolation improves by 15 dB at both 4.6 and 5.9 GHz. Figure 7 also confirms the switch tuning ability with the variation of AP, showing the resonant frequency shifts from 3.1 to 5.9 GHz as AP being changed from 2 to 0.5 mm. The agreement between calculated and measured results over the tuning frequency band was good.
CONCLUSIONSA novel asymmetric tunable RF MEMS switch exploiting a mode switching concept through the utilization of a capacitor leg and a slotline inductor has been designed and fabricated to obtain high signal isolation for selected frequency at the low microwave frequency regime. The asymmetric switch occupies the same area and employs the same process flow of the regular capacitive switch. It can be easily tuned to operate at the 2-10 GHz frequency range making it suitable for commercial wireless communication systems such as upcoming higher performance WLAN standards, i.e., IEEE 802.11n systems, and diversity antennas. , RF MEMS switches fabricated on microwave-laminate printed circuit boards, IEEE Electron Device Lett 24 (2003), 227-229.ABSTRACT: A newly developed evolutionary computing algorithm, Jumping Genes Evolutionary Algorithm is applied to optimize the dimensions of a folded patch antenna with double shorting walls. In the optimized design, an impedance bandwidth (VSWR Յ2) of 101% is recorded, which shows an improvement by 29% comparing with its original design. Figure 7 Measured isolation for asymmetric MEMS switches with different air-bridge position AP for CL ϭ 25 m 706 ABSTRACT: We present a new strategy to compute the impedance elements of the Magnetic-Field Integral Equation (MFIE) formulation in Method of Moments (MoM) with a discretization of low-order divergence-conforming basis functions (RWG). The impedance matrix elements are accurately computed by swapping the inner-and outer-integrals in the accurate computation of a MoM-MFIE discretization with low-order curl-conforming basis functions (nxRWG).͓Z CPV,mn ͔ ϭ Ϫ ͗f ជ m ,n m ϫ ͵ CPV,T n ϩ ഫT n Ϫ f ជ n ͑r ជЈ͒ ϫ ٌЈG͑r ជ,r ជЈ͒ dsЈ͘ (3)
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