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Millimeter wave spectrum is the main candidate for body centric wireless applications such as health monitoring, live streaming, and gaming. In this paper, a frequency scanning microstrip antenna array is designed as it provides reconfigurability in the direction of main beam pattern. The designed antenna is an array of 16 elements with the measured impedance bandwidth from 33GHz to 40GHz. The S11...
Dealing with multiple antennas in various wireless devices has raised a distress of health effect. Thus, the investigation towards the relations between the electromagnetic field (EMF) radiation and human health is significant to be discovered. Hence, this paper presents the specific absorption rate (SAR) investigation on a single and 1 × 2 array of microstrip patch antenna operated at 0.8, 0.85,...
This paper presents the design of a 1×10 series feeding rectangular microstrip patch array antenna for 77 GHz automotive radar. The proposed antenna is designed based on the transmission line model analysis method. To satisfy the sidelobe level of −20 dB in E-plane, 20 dB Taylor distribution is applied to the proposed antenna. Considering the measurement environment, waveguide to microstrip transition...
This paper presents the focusing characteristics of near fields radiated from multi-panel phased array antennas, where each panel of the antenna array is designed to focus its radiation in the antenna near-field region, for UHF-RFID applications. The cylindrical arrangement of panels creates a relatively symmetrical focusing region beneficial to the tag detection within a confined region of bio-medical...
This paper proposes small CRPA arrays with high-dielectric ceramic superstrates for dual-band operation. Each array element consists of inner and outer microstrip rings printed on a high-dielectric substrate, and a hybrid chip coupler is used for quadrature excitation to achieve circular polarization. The superstrates with high relative permittivity are designed to have a cylindrical shape and are...
A kind of low sidelobe and high gain microstrip antenna array with 32×8 units operating in the X-band is designed, which achieves the gain of 28 dBi and the sidelobe level of −25 dB at 9.37 GHz. The Chebeshev distribution is used in designing the current distribution on the surface of this antenna, which achieves a width of main lobe of 5° in E-plane and a main lobe width of 10° in H-plane. The amplitude...
In this paper, we investigate feasibility of orbital angular momentum (OAM) based analog transmission method. The method uses analog discrete Fourier transform (DFT) feed networks for mode generation as well as circular array antenna with right-hand and left-hand circular polarizations. The simulation revealed the designed array antennas enhance the capacity up to double of the single polarization...
An 8×8 slot array with high-efficiency and corporate-fed single layer by ridge gap waveguide at 60-GHz is introduced in this paper. The manufactured antenna depicts more than 19.6% bandwidth with input reflection coefficient better than −10 dB and the aperture efficiency higher than 70% with around 26 dBi realized gain between 58 and 66 GHz.
A flat and low profile, wideband and high gain Substrate Integrated Waveguide (SIW) Transmission Line (TL) Butler Matrix (BM) beamforming network (BFN) for beamforming and beam-steering applications at 28 GHz (5G) is presented in this paper. Four distinct beams steering between −35° to 35° with sidelobe and return-loss level below −10 dB are generated by connecting the proposed BFN to microstrip antennas...
A surface wave antenna (SWA) with low profile and circular polarization is proposed. The proposed structure consisting two substrates: microstrip element on upper and feeding patch with ground plane on the lower. A microstrip line is radiating element with a length of approximately 2λg which can radiate circular polarization resulting in bi-directional beams along the longest part of the elements...
The two elements array antenna composed of inverted L antennas printed on the two-layer dielectric substrate and excited by the microstrip line through the slot is proposed and numerically analyzed. The size of the antenna is 0.24 λ by 1.25 λ by 0.0352 λ. The S 11 less than −10 dB is satisfied from 23.96 GHz to 24.06 GHz, and gain is 3.63 dB at frequency of 24 GHz. In the numerical analysis, the electromagnetic...
This paper presents rotational circularly polarized array antenna at 12 GHz. Array antenna degraded radiation performance because of mutual coupling between adjacent elements. General array antenna has same direction port each single elements. However, proposed rotational array antenna has different direction port to reduce the mutual coupling. As a results, mutual coupling of 2 by 2 rotational array...
The design of a single layer wideband circularly polarized 2 × 2 microstrip array at X-band frequencies is described. The antenna elements are shorted annular patches and the array is driven with a sequential-phase feeding network. The array is modelled on a 1U CubeSat. The performance of the array is compared to a single element microstrip antenna.
In this paper, the authors proposes a easy calibration of DOD-based BLE beacon system for an indoor localization application. By the proposed calibration method, we can easily recognize the orientation and location of the beacon even though the beacons are roughly installed. The method uses DOD calculated from RSSI of received beacon signals and sensor information of the mobile handset for calibration...
In this paper a double layer cavity backed slot array antenna at E band is presented for point-to-point wireless communication. The antenna is built using an equal-split rectangular waveguide feed network and 2×2 elements sub array. The feed network is composed four E-plane T-junctions to lower the leakage between the metal plate. The 8×8 slot array antenna has been fabricated using PEI resin. The...
This paper presents the design of an ellipsoidal reflector antenna for the RFID applications at UHF band, which can be potentially integrated with a dome-shape building structure. Due to the dual-focus radiation characteristics in the ellipsoid near-field region, the feed located at one of the two foci can create a focused field distribution around the other focus, which is located in the ground area...
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