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A new compact [Formula: see text] microstrip patch antenna array design for future 5G applications is presented in this paper. The proposed antenna array consists of square slot loaded with four radiating patch elements. The corporate feed network has been implemented for the excitation of the array. The feed line is connected to the square slot patch through a quarter-wave transformer matching network. The proposed array is designed on an FR-4 substrate with a dielectric constant of 4.4, thickness of 1.6[Formula: see text]mm and loss tangent (tan[Formula: see text] of 0.02. It has a compact dimension of 9.590[Formula: see text] 17.802[Formula: see text]. The proposed structure has been designed and simulated by using commercially available HFSS software. The simulated results (reflection coefficient, gain, efficiency, radiation pattern) are verified through the measurement process to confirm the validity of the design concept. The measurement results are in good agreement with the simulated results. The proposed structure resonates at 38.1[Formula: see text]GHz with a [Formula: see text]10[Formula: see text]dB impedance bandwidth of about 3700[Formula: see text]MHz (36.5[Formula: see text]GHz to 40.2[Formula: see text]GHz). The reflection coefficient at 38.1[Formula: see text]GHz is [Formula: see text]34[Formula: see text]dB, with a maximum gain of 7.81[Formula: see text]dB. The proposed square slot loaded patch antenna array is very promising for 5G communications at 38[Formula: see text]GHz band (37–40[Formula: see text]GHz).

Radio Frequency Identification (RFID) is a wireless technology used for tracking a tag attached to an object and uniquely identifying it. In the proposed work, an array antenna that has high gain, good impedance matching, good adaptation, and improved reflection coefficient (S 11 ) at 2.40 GHz for the detection system of objects or living things in motion, has been designed and fabricated. The Fire Resistant RT/duroid-5880 substrate is used for the design purpose of the proposed array antenna. The antenna is an array of four elements with an overall dimension of (223.9 × 98 × 1.56) mm 3 and has a microstrip line feed matched to 50 Ω. The impedance bandwidth achieved by the design is about 120 MHz (2.357-2.477 GHz) at the 2.40 GHz microwave band and has a reflection coefficient, S 11 of about −23.17 dB. The measured gain obtained is around 13 dB. An experimental study of the fabricated prototype of the optimized array antenna is performed and the results verify its good performance.

In wireless communications systems, the microstrip filter has an important job in terms of selectivity and elimination of the undesired signals. Microstrip filters are always preferred over the lumped filters at a larger frequency for their compact size, lighter weight, lower cost, and higher performance. In this paper, the design, optimization, and realization of a compact narrow-band bandpass filter using two identical square open-loop resonators is presented for a frequency of 2.4 GHz.This filter is printed on a RO6010 substrate with a dielectric constant of 10.2, a thickness of 1.27 mm and a tangent loss of 0.0023. The proposed filter is intended for wireless communications systems such as (RFID, Wi-Fi, Bluetooth, and WLAN) and medical applications systems that operate at the resonance frequency of 2.4 GHz. This bandpass filter has very high selectivity in the bandwidth of 290 MHz, the small size of (9.4 × 23.1) mm 2 , and small insertion loss of -0.23 dB. The proposed filter structure is easy to fabricate and the achieved results are very encouraging.