Half Mode Substrate Integrated Waveguide: A New Guided Wave Structure for Microwave and Millimeter Wave Application

Abstract

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.

HMSIW Balanced Filter for Improved Isolation between Output Ports

“…따라서 기판 집적 도파관 내에는   만 존재하고, 기본 전파 모드는   모드가 된다 [4] . 이러한 기판 직접 도파관은 마이크로스트립 선로 에 비해 크기의 단점을 가지고 있는데, 이러한 단점 을 해결하는 방법으로 하프 모드 기판 집적 도파관 (이하 HMSIW)이 연구되었다 [8] . [9], [10] .…”

Substrate Integraged Waveguide Wilkinson Power Divider With Improved Isolation Performance

“…Therefore, the return and isolation characteristics at the output ports are simultaneously improved by the out-of-phase interference. The whole equivalent circuit in Figure 2 has been implemented by an entire-SIW circuit having two HMSIW [8] sections bridged by an isolation resistor as shown in Figure 3. The tapered microstrips are used only for the coaxial connections for the 3-port measurements.…”

“…15 Ω characteristic impedance (Z 0 ) and 15 GHz center frequency are chosen for considering the waveguide loss of a Taconic substrate (TLP-3, ε r = 2.33, thickness = 0.254 mm) and the Ku-band applications, respectively. W 2 has been calculated using the well-known waveguide Z 0 equation [8]. W 1 , and W 5 are designed for the 50 Ω coaxial connections linearly tapered from the SIW ports.…”

Rf Mems Based Half Mode Bowtie Shaped Substrate Integrated Waveguide Tunable Bandpass Filter

“…Hong et al in 2006 proposed a half-mode substrate integrated waveguide (HMSIW) concept which can reduce the size of SIW components by half [9]. Performances at microwave and millimeter wave bands show that its attenuation is less than that of planar microstrip and SIW.…”