Abstract：To address the issues of large size, heavy weight, and complex structure of sum-and-difference power divider networks in active phased array antennas, a compact planar sum-and-difference power divider network based on microstrip-waveguide hybrid transmission line is proposed. The network employs four three-branch hybrids and four 1:8 Wilkinson power dividers to achieve 1:32 power distribution. The sum-and-difference comparator and power divider are designed in a coplanar configuration, operating in the Ku-band. Measured results demonstrate that the amplitude consistency (RMS) is better than 0.2 dB, phase consistency (RMS) is better than 4°, the null depth of difference beams in both elevation and azimuth planes is greater than 20 dB, and the voltage standing wave ratio (VSWR) of all ports is less than 1.8. The fabricated prototype features compact structure, small size , light weight , and ease of fabrication, making it suitable for airborne and missile-borne phased array antenna applications.

Abstract：In mobile communications, satellite communications, and radar systems, reducing signal interference has become a key objective. Flat-topped dielectric resonator antennas (DRAs) exhibit strong anti-interference capability, high design flexibility, rich resonant modes, and compact dimensions. Based on the principle of pattern superposition, both the low-order DRA mode and the slot mode are simultaneously excited to achieve a flat-topped radiation pattern in both the E- and H-planes. By attaching two substrates with relatively high permittivity to the DRA, the resonant frequency of the DRA mode is reduced. Additionally, metallic walls are incorporated around the substrate to confine the electromagnetic field propagation, thereby modifying the directivity and sidelobe levels. Ultimately, a compact dielectric resonator antenna operating at 3.0 GHz with a flat-topped radiation pattern has been designed. The radiation pattern of the proposed antenna demonstrates a flat-top characteristic in both the E- and H-planes. Compared with other flat-topped antennas, the proposed structure offers the advantages of simple configuration and compact size.

Abstract：Traditional PCB design for RF filter circuits primarily focuses on impedance matching, with limited consideration given to the control of electromagnetic coupling paths, which restricts port isolation in filtering units. To address this, a method to achieve high isolation on PCBs based on a "field-circuit-shielding" synergistic design is proposed. This method integrates three core techniques: thinning the critical dielectric layer to enhance vertical field confinement; optimizing the coplanar ground spacing to suppress in-plane lateral coupling; and employing a high-density via array with the minimum process-achievable pitch to construct a 3D electromagnetic shielding wall. Verified through 3D electromagnetic simulation and physical measurements, the synergistic design approach improves the inter-port isolation by over 16 dB within the 1.6~2.1 GHz frequency band, without significant degradation in insertion loss. This method provides a quantitative engineering reference for the packaging and electromagnetic compatibility design of RF filtering modules and passive filters.

Abstract：This paper proposes a miniaturized analog reflective phase shifter operating in the ISM band. Based on a 3 dB directional coupler as the core topology, the circuit integrates fan-shaped resonators at key nodes of the transmission line. By fully leveraging the capacitive compensation characteristic and space-compact advantage of the fan-shaped structure, a significant reduction in circuit size is achieved, with a 23 % miniaturization compared to the traditional structure. Measured results demonstrate that within the frequency band of 2.4 GHz~2.5 GHz, the phase shifter exhibits a stable phase shift of 173 °±2 °, an insertion loss better than 2.3 dB with a fluctuation of less than 1 dB, and a return loss greater than 15 dB across the entire tuning range. This device combines compact size with simplified structure, demonstrating excellent practical value in applications such as industrial sensing, smart home systems, and short-range communication.

Abstract：Portable telemetry devices, due to their exceptional mobility, ease of transportation, and the capability for temporary augmentation, provide robust supplementary support for telemetry tasks. Among the components of portable telemetry devices, the quality of antenna performance directly impacts the overall system′s performance and decisively determines the range of applications it can be used for.Most existing portable telemetry devices are equipped with directional antennas, which have a narrow beamwidth. This poses significant limitations when these systems are added to special scenarios such as mobile platforms at sea. To address this, an array of multiple antennas is proposed, utilizing multi-antenna signal synthesis techniques to design a phased-array antenna that offers hemispherical coverage.Simulated testing and practical application validation demonstrate that this antenna achieves coverage from 0° to 360° in azimuth and from 0° to 90° in elevation. The gain fluctuates less than 2 dB within the elevation range of 0° to 90°, and it exhibits a gain greater than 8 dBi at low elevations. This outstanding performance makes it highly suitable for receiving telemetry signals from high-speed mobile targets at sea, significantly broadening the application scope and practical effectiveness of portable telemetry devices.

Abstract：To address the non-uniform heating issue in conventional microwave ovens caused by cavity standing waves, this paper proposes and validates a novel uniform heating scheme based on an array of dielectric surface waveguides fed by a horn antenna in free space. The scheme utilizes a horn antenna to excite a symmetrically arranged dielectric surface waveguide array, which in turn launches surface waves within the cavity. Full-wave simulations demonstrate that at 2.45 GHz, the proposed scheme significantly enhances heating uniformity, with its spatial coverage of uniform heating zones substantially surpassing that of conventional direct-feed configurations. Furthermore, simulations performed on a compact microwave oven model under both no-load and loaded conditions (with 1 000 mL of water) show a uniform electric field distribution inside the cavity, high energy absorption efficiency, and a voltage standing wave ratio (VSWR) below 3 across the operating frequency band. This study provides an innovative technical pathway characterized by structural simplicity, high power capacity, and ease of engineering integration for solving the problem of microwave heating non-uniformity.

Abstract：To address the problems of uneven heating and low energy utilization caused by standing wave distribution in traditional microwave ovens, this paper designs a new type of microwave oven based on the principle of artificial surface plasmon, which contains an H-plane waveguide horn antenna excitation device and a metal fold slow-wave structure. The core design parameters of the excitation device are determined, and an array-type metal fold structure is proposed. Simulation results show that this structure can excite uniform surface waves at a center frequency of 2.45 GHz, with a uniformity width of the transverse electric field of 210 mm and a longitudinal height of 150 mm in the cavity. The reflection coefficient is less than -10 dB in the working frequency band of 2.45~2.46 GHz. Uniform heating can be achieved under no-load and different load conditions. After the prototype was fabricated and tested, it was confirmed that this microwave oven effectively improved the standing wave defect of traditional microwave ovens. The energy efficiency of the prototype reached 52%, and the heating uniformity and energy utilization rate were good, providing a new solution and experimental basis for the structural design and performance optimization of new microwave ovens.