In this study, a 28-GHz U-slot array antenna for a wideband communication system is proposed. The U-slot patch antenna structure consists of a patch, two U-shaped slot, and a ground plane. With the additional U-slot, the proposed antenna has around 10% of bandwidth at -10 dB. To increase gain, the U-slot antenna is arrayed to 2×2. The proposed antenna is designed and fabricated. The 2×2 array antenna volume is 41.3 mm × 46 mm × 0.508 mm. The proposed antenna was measured and compared with the simulation results to prove the reliability of the design. The bandwidth and gain of the measurement results are 3.35 GHz and 13 dBi, respectively and the operating frequency is around 28 GHz.Key Words: 28 GHz, 5G, Antenna, U-Slot, Wideband. This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited. ⓒ

No abstract

Microstrip patch antenna (MPA) with loading of shorting pins expressed as a high gain and planar structure. The inductive effect of shorting pin tunes up the resonant frequency leading to increase the electrical size of antenna and, in consequence, its radiation directivity is enhanced. This work proposes a new configuration of MPA with loading of via holes to achieve gain enhancement. The field distribution is analyzed to optimize position of via holes. A prototype of proposed MPA is fabricated and shows excellent realized gain of 11.3 dBi that enhance about by 1.3 dB in comparison to the previous work.

In this paper, Ku-band low phase noise oscillator using DSRR structure resonator based on metamaterial was proposed. To improve the phase noise of the oscillator, the proposed resonator consist of a DSRR strcuture based on metamaterial. The proposed resonator have a characteristic of S11 is -0.25 dB, and S21 in -44.59 dB at 14.67 GHz, respectively. At 14.67 GHz, the proposed Ku-band low phased oscillator achieves a output power of 2.03 dBm, 2 nd harmonic of -36.04 dBc, and phase noise of -130.63 dBc at the 100 kHz offset, respectively.

In this paper, a dual band antenna with the operating frequency in HF and UHF band was proposed. The antenna structure consists of three spiral turns coil in the bottom side to generate the HF frequency of 13.56 MHz. In the top of the antenna, an inverted-spiral dipole structure is used to create the UHF frequency of 922 MHz. The dual band antenna was optimized to reduce size with 80 mm × 40 mm × 0.8 mm dimension. The antenna presents the omnidirectional characteristic with high gain. To validate the theoretical design, the antenna was simulated using FR-4 substrate and verified the simulation results.