A novel modular coupled-resonator filtering magneto-electric (ME) dipole antenna is presented in this paper. The main objective is to achieve a highly integrated filtering antenna (Filtenna). The Ka-band ME dipole antennas are effectively fed by cavity backed double slots. The stack-layer coupled-resonators implemented by LTCC substrate integrated cavity (SIC) technique are used to achieve a compact fourth-degree Filtenna with superior radiation and impedance matching performance for mm-wave 5G array antenna applications. Compared with previous works, the proposed Filtenna demonstrates a unique performance and promising results in terms of the flat gain profile with a realized gain of 5.4 dB as well as a return loss and steep roll-off close-to-band rejection better than 15 dB and -20 dB, respectively.

This study introduces a machine learning (ML)-driven approach to next-generation microwave filter design that enhances both accuracy and efficiency via repeated refinement. The approach includes generating a coupling matrix from filter specifications, followed by predicting physical parameters such as iris widths and resonator lengths using ML models, especially with the XGBoost algorithm. These predictions are validated and tuned via simulations and iterative adjustments to ensure meeting the performance criteria, such as center frequency, bandwidth, and return loss. For tuning, in this work, we used Simulated Annealing to extract a coupling matrix to reduce errors and hence allow accurate further optimization. The predicted values before optimization are more than 90 percent accurate compared to the optimized values, significantly reducing the optimization time and the number of iterations required. To demonstrate the procedure’s validity, third-, fourth-, and fifth-order filters are implemented, which shows significant improvements in design efficiency and accuracy.

This paper presents a compact four-port multiple-input multiple-output (MIMO) antenna operating in the Ku-band around 13 GHz, targeting early-phase 6G upper-midband front-end applications. The proposed antenna employs orthogonally arranged short-ended square patch elements combined with a modified defected ground structure (DGS) to achieve high port isolation and compact footprint. A prototype fabricated on Rogers RO4350 substrate demonstrates good agreement between simulated and measured results. The antenna achieves $|S_{11}|$ < −10 dB over 12.9–13.1 GHz band, inter-port isolation exceeding 25 dB, and an envelope correlation coefficient (ECC) below $0.01$. The measured realized gain reaches 7.02 dBi with a radiation efficiency above 80%. Compared with recent Ku-band MIMO antennas, the proposed design provides a 45% size reduction while maintaining high isolation at a close element spacing of 0.25${\lambda }_0$. The proposed antenna intentionally adopts a narrowband operating characteristic, reflecting a design trade-off that prioritizes compact size, high isolation, and low spatial correlation over wideband performance. These features make the antenna well suited for early-stage 6G-oriented front-end modules, fixed wireless access, backhaul links, and short-range sensing systems operating in the upper-midband frequency range.

In this paper, a novel planar array antenna with filtering functionality is presented. The main idea is to integrate both the antenna and filter with a combined treatment. The coupled radiating resonators are effectively adopted to obtain a fourth degree steep roll-off filtering antenna (filtenna). The proposed antenna is a 2*2 cavity-backed slot array antenna built by substrate integrated waveguide (SIW) technology. The proposed slot array filtenna take the advantages of total size reduction, efficient utilization of RF power and spectrum as well as enhanced signal-to-noise ratio (SNR). The design methodology is verified by achieving return loss and realized gain better than −15 dB and 9 dBi, respectively, which exhibits unique capability of the proposed method.

This paper presents a novel method for accurately extracting the coupling matrix and unloaded Q of the lossy microwave filters from measured scattering parameters. The proposed method is an accurate and straightforward technique to extract the coupling matrix of the filter in any desired topology, which has a great demand for the design and tuning of filters. This approach uses the Simulated Annealing (SA) algorithm to fit the extracted and measured scattering parameters of the filter. Finally, this method is applied to two different filters, the first with four degrees and the second with five orders filter with two symmetric transmission zeros, which verifies the proposed method’s accuracy.

This paper presents a miniaturized HF/UHF dual-band antenna fed by a dual-interface RFID chip. The main goal of the antenna design is to achieve a compact, cost-effective, multi-purpose, and high performance RFID transponder. The proposed antenna utilizes the HF coil as a ground for a meandered monopole antenna operating at UHF band. An inductive network is adopted to achieve a conjugate matching between the antenna and the UHF chip interface. Measurements of a transponder prototype show a power sensitivity of −16.5 dBm, which corresponds to a realized antenna gain of approximately −1 dBi at 860 MHz.