In modern wireless systems, it is essential to incorporate numerous functions into a single component to accomplish cost-effective, lossless, and miniaturized properties. To achieve these facilities, multifunctional devices (MFDs) are necessary. An MFD is an electromagnetic radiating or receiving device that offers additional functions that might comprise multiple bands, reconfiguration, filtering, and active devices. A frequency-reconfigurable radiating device is able to adjust its frequency of operation over a wide bandwidth, which reduces the need for multiple radiating devices for different wireless services. Hence, the price and the dimensions of the wireless system can be minimized.

This article presents a reconfigurable hybrid millimeter-wave software-defined radio (SDR) receiver that integrates silicon photonics (SiPhs) and CMOS chips. The SDR system leverages a programmable photonic integrated circuit with high-Q filters, enabling versatile channel selection, image rejection, and jammer rejection capabilities over a tunable frequency range of 30–45 GHz and a bandwidth of 3–5 GHz. It is also capable of autonomously detecting and simultaneously rejecting up to four out-of-band blockers to enhance SDR robustness in crowded spectral environments.

This letter introduces a quadruplet structure in waveguide technology, comprising a dual-mode TM cavity within two λ /4 TE cavities. This structure demonstrates the capability of generating responses with four poles and two transmission zeros (TZs). It accommodates both wideband and narrowband responses effectively. The TZs are obtained by exploiting the non-resonating modes within the TM section. The coupling between the resonant mode of the TE section and both resonating and non-resonating modes is achieved by precise positioning of the TE section relative to the TM section. This inherent flexibility in TZ positioning renders the structure highly adaptable. 

This article introduces a CMOS low noise amplifier (LNA) in the 32–46 GHz frequency range. The goal is to get a broadband LNA with low NF. The objective was realized through the application of a three-winding transformer and multi-array transistors (large transistor) strategy. The LNA circuit is manufactured using a 65-nm bulk CMOS process and achieves a NF of 2.2–3.2 dB, a gain of 9.2–21.5 dB, and −7.6 dBm IIP3 at 38 GHz. 

This paper introduces a dual band-pass and dual band-stop filter that is designed along its flexible back-end circuitry to sense and monitor muscle contractions. The filter and its back-end circuit are proposed to be wearable, flexible, and stretchable. The presented design is composed of several logarithmically scaled spiral-shaped defected ground structures (DGS) located along the ground plane of a co-planar waveguide transmission line. In addition, U-shaped slots are integrated within the transmission line to maintain the sensing operation of the filter when its structure is stretched.