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This paper presents a 6-bit phase shifter operating in the 11∼13 GHz band. The designed phase shifter is fabricated using a 130-nm SOI process to validate its performance. For fine phase adjustment, the phase shifter employs six single-bit phase shifters ranging from 5.625° to 180°. To expand the bandwidth and minimize the phase and gain errors, the 90° bit uses low-pass and high-pass filters. Additionally, the 180° bit uses a transformer-based switch structure. The fabricated phase shifter measures 0.87×0.4 mm², with a return loss of more than 10 dB, an average insertion loss of 6.41 dB, RMS phase errors ranging from 3.19° to 4.13°, and RMS gain errors between 0.52 dB and 0.56 dB. [ABSTRACT FROM AUTHOR]

This paper presents a 6-bit phase shifter designed and fabricated using a 150-nm GaN HEMT process. The designed phase shifter operates in the n257 (26.5-29.5 GHz) band of the 5G NR standard, and the structure of a switched-filter phase shifter is used. The designed phase shifter connects six single-bit phase shifters in series from 180° to 5.625° to change the phase within the phase range of 360°. An LCL low-pass T-type filter is used to reduce the size of the filter element. The 180° phase shifter mixes low-pass and high-pass T-type filters. The fabricated phase shifter has an average insertion loss of 8.45 dB and an RMS phase error of less than 4.54° at 26.5-29.5 GHz. Herein, the phase shifter had a low insertion loss per bit and a small RMS phase error. [ABSTRACT FROM AUTHOR]

Jet engine modulation(JEM) signals are widely used for target recognition. These signals coming from a potentially hostile aircraft provide specific information about the jet engine. In order to obtain the number of blades, which is uniquely provided by the JEM signal, one must extract the spool rate, which is the rotation speed of the blades. In this paper, we propose an algorithm to extract the spool rate from a weak JEM signal. A criterion is developed to extract the spool rate from the JEM signal by analyzing the intensity of the JEM signal component. The weak signal is first subjected to a high-pass filtering-based process, which modifies it to facilitate spool rate extraction. We then apply a peak detection process and extract the spool rate. The technique is simpler than the existing CEMD or WD method, is accurate, and greatly reduces the time required. [ABSTRACT FROM AUTHOR]