A novel perturbation approach using additional metalized via-holes for implementation of the dual-band or wide-band dual-mode substrate integrated waveguide (SIW) filters is proposed in this paper. The independent perturbation on the first resonant mode TE101 can be constructed by applying the proposed perturbation approach, whereas the second resonant mode TE102 is not affected. Thus, new kinds of dual-band or wide-band dual-mode SIW filters with a fixed or an independently reconfigurable low-frequency band have been directly achieved. In order to experimentally verify the proposed design method, four two-cavity dual-band SIW filters, which have different numbers of perturbation via-holes in each cavity, and a two-cavity dual-band SIW filter, which includes four via-holes and eight reconfigurable states in each cavity, are designed and experimentally assessed. The measured results indicate that the available frequency-ratio range from 1 to 1.3 can be realized by using four two-cavity dual-band SIW filters. The center frequency of the first band can be tuned from 4.61 GHz to 5.24 GHz, whereas the center frequency of the second one is fixed at around 6.18 GHz for the two-cavity dual-band SIW filter with four reconfigurable states via-holes. All the simulated and measured results show an acceptable agreement with the predicted data.
In this paper, a novel perturbation approach for implementing the independently reconfigurable dual-mode dual-band substrate integrated waveguide (SIW) filter is proposed. Dual-frequency manipulation is achieved by adding perturbation via-holes (the first variable) and changing the lengths of the interference slot (the second variable) in each cavity. The independent control of the upper passband only depends on the second variable while the lower passband is independently tuned by combining the two variables. Using such a design method, a two-cavity dual-band SIW filter is designed and experimentally assessed with four via-holes and an interference slot in each cavity. The dual-band filter not only has a frequency ratio (fR) ranging from 1.14 to 1.58 but also can be considered as a single passband one with a tunable range of 40.5% from 1.26 GHz to 2.12 GHz. The scattering parameters |S11| and |S21| are in the range of -10.72 dB to -37.17 dB and -3.67 dB to -7.22 dB in the operating dual bands, respectively. All the simulated and measured results show an acceptable agreement with the predicted data.
The quiet zone of compact antenna test range (CATR) is typically required as uniform as possible with a low phase deviation error. Here, we propose a novel phaseless CATR characterization method by combining a single millimeter‐wave metasurface lens‐based technique and an alternating projection algorithm. The metasurface lens provides two sets of weakly correlated amplitude‐only data to the algorithm by changing the propagation path of the pseudo‐plane wave, hence realizing the phase retrieval of the quiet zone with low complexity of measures. In addition, initial phase preprocessing is adopted to further improve the precision of phase retrieval. Furthermore, different alternating projection algorithms are compared to validate the effectiveness of the proposed method, showing the maximum phase error in the effective quiet zone reaches 0.75° at 220 GHz. In the end, the simulation results show that the proposed method can be applied in the ultra‐broadband frequency range of 120 GHz. In a nutshell, this paper provides new insights for the applications of metasurface lens in the phaseless characterization of CATR.
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