Communication systems have been driven towards the fifth generation (5G) due to the demands of compact, high speed, and large bandwidth systems. These types of radio communication systems require new and more efficient antenna designs. This article presents a new design solution of a broadband microstrip antenna intended for use in 5G systems. The proposed antenna has a central operating frequency of 28 GHz and can be used in the LMDS (local multipoint distribution service) frequency band. The dimensions of the antenna and its parameters have been calculated, simulated, and optimized using the FEKO software. The antenna has a compact structure with dimensions (6.2 × 8.4 × 1.57) mm. Rogers RT Duroid 5880 material was used as a substrate for the antenna construction, which has a dielectric coefficient of 2.2 and a thickness of 1.57 mm. The antenna described in the article is characterized by a low reflection coefficient of −22.51 dB, a high energy gain value of 3.6 dBi, a wide operating band of 5.57 GHz (19.89%), and high energy efficiency.

The field of wireless cellular network technology has seen a significant development in recent years, allowing the emergence of many new applications in addition to the traditional mobile phone calls. We are currently implementing the 5G system, which is replacing the previous cellular technologies on the market. Parallel to the development of cellular technologies, wireless local networks based on the IEEE 802.11× standards are rapidly spreading. The desire to use the advantages of both mobile telephony and wireless local networks has led to the idea of integrating the currently used communication systems in one device and requires a well-designed antenna, which should be given a lot of attention when designing the radio system. This article presents the proposed model of a two-band microstrip antenna for which the main assumption is its operating frequencies in the LTE-U (LTE-Unlicensed) band and one of the 5G system bands. The antenna dimensions and parameters have been calculated, simulated, and optimized using CST Microwave Studio software. The developed antenna has a compact structure with dimensions of (60 × 40 × 1.57) mm. The dielectric material RT Duroid 5880 with a dielectric constant ε_r = 2.2 and thickness h = 1.57 mm was used as a substrate for the antenna construction. The article presents an analysis of the results of simulation and measurements of selected electrical parameters and radiation characteristics of the proposed antenna. The antenna described in the article, working in 5G systems and LTE-U systems, is characterized by two operating bands with center frequencies equal to 3.52 GHz and 5.37 GHz, a low reflection coefficient (for resonances −31.54 dB and −23.16 dB), a gain value of 4.45 dBi, a wide frequency band of 3.0 GHz (68.18%), and a high energy efficiency in the range of 80–96.68%.

The paper presents method for assessing immunity electronic equipment for high power electromagnetic pulses carried out by employees of the LAB-KEM MUT. Assessment immunity of electronic equipment will help you understand the susceptibility threshold of these devices on the high power electromagnetic pulses environment (called High Power Electromagnetic - HPEM). This assessment focuses on determining the upper limit of strength the computer equipment (storage devices) in the HPEM environment.

This paper presents the project of WLAN antenna made in microstrip technique working at a frequency of 5 GHz in 802.11ac IEEE standard. The paper presents the results of discussed numerical analysis.

The article concerns the wideband microstrip antennas. The article presents the design, execution and measurement of basic parameters of wideband microstrip antenna. The article shows two antennas with U shape radiators. Results obtained during simulation and design of antennas have been confirmed through the measuring way.

The article presents measurements results of the level of radiated emission of selected LED lamps. Two types of LED lamps have been tested. The first of them are lamps powered with constant voltage of 12 V, and the other lamps powered with 230 V AC. Lamp tests were carried out for the possibility of using this type of light source for illumination of the anechoic chamber during EMC tests. Obtained results clearly indicate whether such lamps can be used in anechoic chambers.