The authors present exploitation of Multiple Views in Single‐Path (MVSP) Synthetic Aperture Sonar (SAS). The authors demonstrate the interest of MVSP SAS for underwater Mine Counter‐Measures (MCM) with unmanned vehicles, to comply with requirements for performances of detection and classification and time constraints. The authors here lay the emphasis on exploitation in reduction of false alarms of classification by alleviating the ambiguity between mines and natural bottom objects. Finally, the authors show that MVSP SAS is offering a pre‐identification tool with high impact on MCM process duration.

Extension of Synthetic Aperture Sonar provides Multiple Views in Single Path: this is useful for performances in detection and classification in Mine Warfare applications with unmanned vehicles. The authors also show that these technology and performances are close to offering a pre‐identification tool.image

This letter presents a compact penta‐band microstrip slot antenna. The proposed antenna comprises a microstrip feed line on the top plane, a polytetrafluoroethylene (PTFE) substrate, and a slotted ground plane. Different shapes of slots and two pairs of horizontal strips on the ground are introduced to achieve five frequency bands. A prototype is fabricated and measured to demonstrate the validity of the design. According to the measured result, the fabricated antenna can operate at five operating frequencies with an impedance bandwidth of 2.41–2.55 GHz (5.65%) for Bluetooth and WLAN, 3.31–3.58 GHz (8.14%) for WiMAX and Sub‐6 GHz 5G applications, 4.52–4.76 GHz (5.17%) for radiometry, 5.10–6.20 GHz (19.47%) for WLAN and ITS, and 10.14–12.40 GHz (20.10%) for radar applications. Moreover, the proposed antenna shows a bi‐directional radiation pattern at each operating band.

This letter presents a compact penta‐band microstrip slot antenna. The proposed antenna comprises a microstrip feed line on the top plane, a polytetrafluoroethylene (PTFE) substrate, and a slotted ground plane. The fabricated antenna can operate at five operating frequencies with an impedance bandwidth of 2.41–2.55 GHz (5.65%) for Bluetooth and WLAN, 3.31–3.58 GHz (8.14%) for WiMAX and Sub‐6 GHz 5G applications, 4.52–4.76 GHz (5.17%) for radiometry, 5.10–6.20 GHz (19.47%) for WLAN and ITS, and 10.14–12.40 GHz (20.10%) for radar applications.image

Despite the recent upsurge of self‐supervised methods in single image denoising, achieving robustness and efficiency of performance is still challenging due to some prevalent issues like identity mapping, overfitting, and increased variance of network predictions. Recent self‐supervised approaches prescribe a dropout‐based single‐pixel masking strategy in this regard. However, real camera noise is signal‐dependent, and typically poses trivial changes to the images. Hence, such a strategy still preserves contextual information about target location even after dropping them out, leading to an identity mapping and overfitting problems in practice. Here, Cut2Self, a new denoising method to address this issue, which cuts out random block‐regions instead of singleton pixels to provide the higher possibility to remove contextual information from the neighbouring pixels, thus reducing identity mapping chances while being resilient against overfitting is proposed. Cut2Self creates distinct training pairs for each training iteration by randomly cutting out square regions of input and sending them to the denoising network. Thus, iteration‐wise different network predictions are generated, which are then assembled to generate the final denoised output. Cut2Self is evaluated with synthetic and real‐world noise, visualising its consistent denoising performance compared to other supervised, unsupervised, and self‐supervised methods.

Recent self‐supervised denoising approaches prescribe a dropout‐based single‐pixel masking strategy. However, real camera noise is signal dependent, and typically poses trivial changes to the images. Hence, such strategy still preserves contextual information about target location even after dropping them out, leading to identity mapping and overfitting problems in practice. Here, Cut2Self, a new denoising method to address this issue, which cuts out random block‐regions instead of singleton pixels to provide the higher possibility to remove contextual information from the neighbouring pixels, thus reducing identity mapping chances while being resilient against overfitting is proposed.image

A novel 3‐bit frequency‐reconfigurable antenna (FRA) with miniaturized dimensions is realized with a meander line. The frequency reconfiguration of the antenna is achieved by introducing N Radio Frequency (RF) PIN diodes into the meander line. The related parts of the meander line with different lengths are bypassed or included into the antenna by switching on or off the diodes, resulting in 2 ^N switchable size lengths of the antenna and equally spaced operating frequencies. A 3‐bit reconfigurable meander‐line antenna (N = 3) is designed, and the simulated and measured results agree well. The antenna provides 8 (2³) independent and switchable states, with the operating frequencies covering a wide switchable frequency range from 1.04 to 1.51 GHz and the working bandwidths varying from 80 to 150 MHz. The number of working bandwidth states is maximized, considering the number of switches used. Moreover, the results reveal an acceptable peak gain of 1.59 dBi in terms of the miniaturized total dimension of 0.17 λ_g × 0.07 λ_g (λ_g is the guided wavelength at the lowest working frequency), which is more compact than several published FRAs.

This figure gives the circuit and topology of the reconfiguable antenna.image

A method is presented for the design of high‐speed frequency dividers in which the divided output signals are phase aligned by means of a scheme based on cascaded retiming. The objective of the design method proposed is to break the accumulation of propagation delay occurring in a divider chain that may limit the speed of the phase synchronization. Compared to alternative approaches where the phase synchronization is achieved with additional logical gates applied to the divider outputs, the authors’ approach only uses latches that are identical to those already employed in the divider chain itself without any additional synchronization logic. Hence, a better uniformity and homogeneity of the layout can be achieved, which helps improve the phase balancing. The method proposed to design synchronous dividers has been implemented in 5‐nm FinFET CMOS technology by means of a synchronous 8b‐counter providing the division factors 1/2 through 1/256. Its output phase synchronization has been verified in measurements at 10 GHz. The measured power consumption is 720 μW and the silicon area of the divider implemented is 79 μm².

A design method for the synchronization of frequency dividers is proposed that is based on the application of cascaded retiming to break the accumulation of propagation delay occurring in conventional ripple carry counters, thus achieving higher frequencies and uniform phase balancing. The method proposed to design synchronous dividers is implemented in 5‐nm FinFET CMOS technology by means of a synchronous 8b‐counter providing the division factors 1/2 through 1/256 and is verified in measurements at 10 GHz.image