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A novel technique is introduced to improve the directivity of the E-plane pattern of substrate integrated waveguide (SIW) horn antennas. While the H-plane directivity of a SIW horn antenna is good, SIW horns have a wide E-plane radiation pattern due to the thin substrates of SIW circuits. Increasing the substrate height to improve the E-plane half power beam width (HPBW) makes it difficult to fabricate...
This paper presents a very simple bidirectional ultra-broadband antenna, which comprises a cylindrical ring, a disc surface probe, and a superellipse slot. The proposed antenna covers many world-famous frequency bands: GSM, UMTS, LTE, WLAN, WiMAX and UWB. In the design, numerical simulations are performed using the method of moments (MoM) with RWG basis function. The ultra-broad bandwidth is approximately...
A substrate integrated waveguide (SIW) H-plane horn antenna loaded with dipole array is proposed. The horn antenna works with the gain from 9.0 to 11.7 dBi, high front-to-back ratio and stable radiation patterns in the entire Ka-band.
A novel broadband circularly-polarized (CP) antenna fed by strip-line is proposed. The CP operation is achieved by corners truncated and can be significantly improved by introducing a pair of half loop strips around two opposite corners of the square patch. The bandwidths for the axial ratio (AR < 3 dB) and relative impedance (|S11| < −10 dB) is 7.6% (16–17.2 GHz). The proposed antenna also...
A low-profile wideband unidirectional dipole antenna with U and L-shaped slots loaded is proposed. A prototype with a thickness of 0.175λ was fabricated and measured. The proposed antenna achieves a wide impedance bandwidth of 57% (S11≤ −10 dB) from the frequency of 1.56 to 2.79 GHz. The cross polarization is less than −21 dB over the operating bandwidth. The antenna has an average gain of 8.6 dBi...
A novel polarization reconfigurable aperture-coupled magneto-electric (ME) dipole antenna is presented. By electronically controlling the state of switches between square patches and an additional strip of the ME dipole, the antenna is capable of switching the polarization among one linearly polarized (LP) and two orthogonal circularly polarized (CP) states. An overlapped bandwidth of 16% from 5.07...
An 8-port planar UWB MIMO antenna is proposed for 5G micro wireless access point applications in this paper. The proposed antenna is formed by integrating three monopole strips with different structures and resonant modes, thereby resulting in a much wider bandwidth to cover UWB high band (5.15–10.6 GHz) with S11 lower than −10 dB. High isolation (lower than −15 dB) and low ECC (lower than 0.02) are...
A square loop antenna (SLA) based on the hybrid high impedance surface (HHIS) substrate is investigated. For achieving reconfigurable radiation pattern, the antenna includes four feeds which can be excited both individually and simultaneously. At the four corners of the four arms, the antenna is loaded with narrow metallic strips that serve as inductances for the sake of bandwidth expanding. The simulation...
The paper proposes a new beam-switchable dipole antenna. The functionability is realized by reconfiguring the state of the four side apertures of a square substrate integrated waveguide (SIW). Four wide dipoles are loaded in front of the four apertures. The selected radiating aperture is able to excite the corresponding loaded dipole. The other dipoles work as reflectors. Thus, directional radiation...
In this paper, a metallic 3D printed K-band (18–26.5 GHz) antenna is proposed. The proposed antenna consists of a circle horn antenna, a flange and a transition from flange to horn antenna. For improved performance of the antenna at upper band, double ridges are printed symmetrically at the inside wall of the horn antenna. At the same time, two gradual ridges connect the double ridges and flange for...
In this paper, a novel capacitive coupled patch antenna array capable of providing 360° coverage is proposed. The design and performance of the antenna element is discussed. The proposed antenna design is positioned in the mobile phone chassis as a set of 4 sub-arrays each with 12 antenna elements to provide high gain around 27 dBi with each sub-array providing 90° coverage. The antenna array covers...
We present a new circularly polarized microstrip antenna with an airgap for multiple Global Navigation Satellite System (multi-GNSS) receivers. The airgap structure substantially increases antenna gain and bandwidth. We examined the antenna properties by simulation and measurement. The measured results show the −10 dB bandwidth of 4.9% and the maximum antenna gain above 7.0 dBi over the whole multi-GNSS...
A modified dipole form of the PICA (planar inverted cone antenna) is presented for EMC measurements in this communication. By simply getting the whole structure halved, a further step towards miniaturization has been taken. The half-cut antenna shows over a decade impedance bandwidth while offering a 50% reduction in the size compared to the full version and having stable directional radiation pattern...
In this paper, three designs of planar antenna is presented. These low profile planar antennas can be used within widely used bands of frequencies that is, between 800MHz to 9GHz (10 bands) of all cellular from 2G to 4G and beyond. In addition, the coverage frequency includes wireless local area networks (WLAN) and WiMax. Significant structural changes are made in one of the latest structure of multiband...
This paper presents a high-gain millimeter-wave array antenna highly integrated on a single organic chip package. The multi-phased beam steering capability is enabled to reduce multipath fading and over-the-air applications around 30GHz. To improve antenna bandwidth, gain and radiation efficiency, a dual-patch antenna is built on a superstrate structure. A number of design attributes, such as patch,...
Some of terahertz detectors such as high temperature superconducting (HTS) YBa2Cu2Ox (YBCO) Josephson junction mixer are suffering from impedance mismatching problem with antenna where the junction impedance barely reaches several ohms. This paper presents two impedance matching methods based on impedance-wideband bow-tie antennas. First, a quarter of wavelength impedance matching network is proposed...
In this paper, a wide-band circularly polarized (CP) crossed dipole antenna is proposed. The CP crossed dipole antenna is backed by a cavity reflector to achieve wide-band CP radiation with enhanced gain and uni-directional pattern accompanied by high front to back lobe ratio. A comprehensive study on the effect of the vertical walls of the cavity reflector on the CP radiation performance has been...
This paper introduces a new antenna model designed to be applied to V2V communications. This antenna can be integrated easily into the automobiles infrastructure and was designed for VANET networks [1] based on LTE technology and IEEE 802.11p standard [2]. The design of this model is based on operating frequencies of these two technologies. In the design process, it was prioritized that each operating...
This paper presents a new stacked-Yagi antenna operating in the E-band that uses logarithmic spiral elements to achieve an ultra wideband response and circular polarization. An SIW structure is used to excite the spiral structure as the single element and a matching post is used as a balun. This element is then used in a vertical stacked-Yagi configuration in order to increase the antenna gain. According...
In this paper, a coplanar waveguide (CPW) fed wide bandwidth T-shaped slot antenna with dual band-notched characteristics is proposed for Ultra-wideband (UWB) applications. The dual band-notches in WIMAX(3.3–3.7GHz) and WLAN(5.15–5.825GHz) applications have been realized by etching an inverted U-slot resonator inside open circuited feeding stub as well as symmetrically placed a pair of straight slit...
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