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An equivalent circuit for stripline-fed cavity-backed slot radiating elements is proposed. The proposed equivalent circuit consist of a transmission line model for the slot mode, a slot end-effect which includes the radiation, and a strip-slot transition model. The equivalent circuit is validated using both simulated and measurement results and goo...
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... find an equivalent circuit for a section of the CBS-line, the parameters, γ CBS and Z 0 , of this TL will be found. These parameters will only depend on the dimensions of the transverse section of the structure shown in Fig. 1 and the medium inside the cavity. A CBS-line section has been simulated using the commercial software HFSS. To properly excite the slot mode without exciting the rectangular-waveguide modes, the line has been fed using two lumped ports, placed between the edges of the slot in each end of the line. The dimensions of the transverse ...
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An ultra-wideband bandpass filter (UWB-BPF) using inductively compensated parallel-coupled lines (ICPCL) is presented in this article. It consists of three circuits: a high-pass filter (HPF), a lowpass filter (LPF), and a transmission line. The HPF and the LPF are independently synthesized from the ICPCL. The proposed filter can suppress unwanted f...
Citations
A cavity-backed slot-antenna (CBSA) pair is designed in a shared cavity inserted with the multifunctional metasurface diaphragms (MSDs). The CBSA pair is co-polarized and in-band, and meanwhile exhibits the good features of a wide working band, good in-band decoupling and enhanced out-of-band filtering performance, which are rarely achieved in other reported CBSAs. The customized MSDs in this design can introduce desired reflection/transmission properties and provide shorting paths in the cavity, which play an important role in adjusting the frequencies of the resonance modes to expand the working bandwidth, allowing proper transmission magnitudes and phases at different frequency points to enable the high isolation level, and generating filtering responses to introduce the radiation nulls (RNs) and enhance the out-of-band suppression. The proposed CBSA pair was analyzed, and then fabricated and measured. The total electrical size at the lowest working frequency
f<sub>L</sub>
is 0.76 × 0.58 × 0.16 λ
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. The overlapped fractional impedance bandwidth is ~11.1%. The peak realized gain reaches 6.4 dBi, and the isolation is greater than 15 dB. The three introduced RNs guarantee the out-of-band suppression level is better than 14.6 dB in 6-15 GHz. The proposed CBSA pair is a good candidate for the miniaturized, co-polarized, in-band and high-efficiency multiple-input-multiple-output CBSAs.
A leaky-wave antenna made of cavity-backed-slot radiating elements with open-stopband suppression is presented. The cavity-backed slots are seriesly fed by a strip. The bandwidth of the unit cell of the array is enhanced by a recently-proposed technique that uses a matching stub. The open-stopband effect is mitigated by misaligning the stub with respect to the slot. An array is designed and fabricated. The array is built using an aluminum set of cavities filled with 3D printed material to support the substrate where the feed and slots are etched. The measurement of the prototype shows the overall good performance of the array. The array is able to scan its beam from −70∘ to 50∘ in the 2.8–4.4 GHz frequency range, keeping good matching even at the broadside frequency. The gain is stable over the band.
A broadband technique to extract the attenuation and phase constants of the slot mode in a rectangular waveguide from either simulation or measurement results is proposed. The method is based on processing the values of the reflection coefficient of several slotted waveguides with different lengths and the same termination and feeding. The accuracy of the method can be improved by increasing the number of simulated or measured waveguides. The proposed technique is specially conceived to separate the contribution of the slot-mode from other modes. An implementable structure and a measurement method to apply the extraction technique are proposed and used. Measured and simulation results of the proposed technique obtained from waveguides filled with two different materials are shown up to 10 GHz and validated using an approximate model. The proposed method can be regarded as a powerful technique to compute the propagation constants of leaky modes in leaky-wave antennas.
