and the reflection losses are better than 12 dB throughout the pass band for both cases.In addition, a two-cell CRLH filter is designed at a center frequency of 1.8 GHz and a fractional bandwidth of 110% following the procedure expanded in [10]. The design values of the CRLH unit cell are C R ¼ 0.5 pF, L R ¼ 1.6 nH, C L ¼ 2.2 pF, and L L ¼ 4.3 nH. This gives a À3 dB lower cutoff of f 1 ¼ 0.8 GHz and an upper cutoff f 2 ¼ 2.8 GHz. The circuit was implemented using standard surface mount devices (SMD).To implement the notch filter, the ENZ tunnel is connected to the CRLH filter as shown in Figure 5(b). The CRLH filter along the tunnel structure is simulated using [8]. Figure 7 shows the simulated and experimental S 21 and S 11 responses. The simulated notch frequency is read at 1.85 GHz with a reflection loss of about 26 dB and an insertion loss of 1.3 dB. For the experimental response the return loss is 18 dB at the center frequency (1.94 GHz) and an insertion loss of 2 dB is recorded. The experimental 3 dB pass band is 2.14 GHz (from 1.15 to 3.29 GHz). There is a slight frequency shift of 0.2 GHz to lower frequencies in the experiment compared with the simulation. This frequency shift is thought to be because of parasitic effects of the SMD components, the effects of the vias to ground and the mismatch between the microstrip line width and the width of the SMD components. However, good agreement is observed between simulation and experiment.
CONCLUSIONSA miniaturized HM substrate integrated ENZ tunnel has been demonstrated. It was shown that this structure allows only one frequency to tunnel through because of the static-like behavior when epsilon is near zero. Subsequently, the tunnel was connected to a CRLH filter in a decoupling mode to reject unwanted frequencies. Good agreement is seen between experimental and simulated results. ABSTRACT: In this study, a dielectric corrugated antenna, as being a feed horn antenna of the reflector antenna for satellite communication applications, is analyzed. The structure consists of a conical dielectric corrugated antenna terminated with a conductor hyperbolic (convex) plate. The antenna system provides a Gaussian beam within wide frequency bandwidth with its dielectric structure. The antenna is simulated and tested for its return loss and radiation performances, and the satisfactory results are obtained for C band satellite communication applications.
This letter describes an asymmetrical coplanar strip (ACPS) wall to suppress the mutual coupling between two closely spaced 5.8-GHz microstrip antennas. The ACPS wall, which is inserted vertically between the two antennas, introduces an additional coupling path to reduce the antenna coupling, occupying just a small area between the two antennas. The decoupling effect of the proposed structure is verified by the simulation and measurement. The experimental results show that the achieved isolation is better than 35 dB and reaches a maximum of 54.3 dB at 5.8 GHz, with an extremely close antenna distance of 0.030 (edge-to-edge distance). The measured patterns indicate that the proposed structure also improves the radiation of the microstrip antenna.
In this work, we realize tunneling propagation through spoof surface plasmon polariton transmission lines loaded with magnetoinductive metamaterial channels above a high cutoff frequency. Magnetoinductive metamaterial channels consist of split-ring resonators, and two different structures are proposed. Samples are fabricated, and both measurements and simulations indicate a near-perfect tunneling propagation around 17 GHz. The proposed methodology could be exploited as a powerful platform for investigating tunneling surface plasmons from radio frequencies to optical frequencies.
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