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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...
In this paper, the bandwidth enhancement of monopole printed antenna backed with metasurface is presented. The proposed antenna which is intended to work at frequency of 2.3MHz consists of a rectangular patch on the top side and a metasurface on the other side. It is designed on an FR4 Epoxy dielectric substrate with the thickness of 0.8mm. To demonstrate the feature of bandwidth enhancement, a conventional...
This paper proposed a helical antenna in which circular parasitic rings are arranged inside a helical antenna. Compared to the gain boosting technique the traditional helical antenna, the height of the additional antenna does not increase. The gain of the proposed antenna is enhanced by a maximum of 2.5 dB in the working bandwidth by adding circular parasitic rings, while maintaining the Axial Ratio(AR)...
A broadband circularly polarized antenna with wide axial-ratio beamwidth utilizing a wideband power divider network is presented. The vertical and horizontal paired-dipoles are used as the antenna elements, which are excited by a 1-to-4 sequential broadband feeding network. Through a rational design of the spacing between two parallel dipoles and the feeding network, an antenna with broad impedance...
A coax-feed low profile dual-polarized circular patch antenna with high impedance surface (HIS) reflector is presented. The proposed antenna contains two pairs of H-shaped slots on the two bow-tie shaped patches separately, which keep the cross polarization under −39 dB. By introducing two short pins, the isolation between the two ports remains more than 40 dB in the whole bandwidth. Low profile and...
An efficient approach to suppress the mutual coupling of a three-element microstrip patch array and a four-element microstrip patch array is proposed using waveguided band-gap structure (WG-BGS). The waveguided band-gap structure are realized by crossed-meander-line slits, which exhibit band-gap property. By inserting the WG-BGS between the elements of coupled patch arrays, the mutual coupling of...
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...
Folded reflectarray antennas can provide a good solution for millimeter-wave systems requiring compact, low-cost antennas, e.g. in automotive applications. A rectangular patch with diagonal slots in the edges is investigated and found to present a phase angle range of more than 460° due to the two resonances. The novel antenna achieves higher gain and better performance, compared to a reflectarray...
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...
This paper proposes a novel dual-band dual-sense circularly polarized (CP) annular ring slot antenna. The antenna consists of two concentric annular ring slots to achieve dual-band operation. The dual-sense circular polarization can be obtained by loading proper lumped capacitors across the inner and outer slots at +45° and −45°, respectively, with respect to the microstrip feed line. An antenna prototype...
In this paper, we proposed a novel mobile phone antenna with yttrium iron garnet (YIG) ferrite slab loaded to enhance antenna bandwidth. The antenna has an inverted-L shaped slot etched on the ground plane. The slot is fed by means of a 50 Ω microstrip connected to a bent strip. A step-shaped YIG ferrite slab is attached on the ground plane in the slot region to enhance bandwidth. The measured −6...
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...
A compact, low-cost, dual-band circularly polarized (CP) microstrip antenna with single-feed operating at both 1555 MHz and 2500 MHz bands is designed in this paper. The circular patch of the antenna is slotted with four complementary spiral grooves for dual-band radiation. The bandwidths of |S11|<−10dB of the antenna are 42 MHz centered at 1555 MHz and 25 MHz centered at 2500 MHz, respectively...
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...
This paper presents an SDR (Software-Defined Radio) implementation of an FMCW (Frequency-Modulated Continuous-Wave) radar using a USRP (Universal Software Radio Peripheral) device. The tools used in the project and the architecture of implementation with FPGA real-time processing and PC off-line processing are covered. This article shows the detailed implementation of an FMCW radar using a USRP device...
The bandwidth of a broadband dual-polarized antenna is enhanced by adding two parasitic elements: a larger parasitic element below the dual-polarized element and a smaller parasitic element above the dual-polarized element. The bandwidth enhanced dual-polarized antenna covers the frequency range from 1.5 to 2.7 GHz with good performance.
The paper introduces a design of radio spectrography receiver that shall serve as equipment for reception, monitoring, and processing of solar radio bursts. These burst can affect operation of many radio communication and navigation services as is presented on example of GPS satellites signal degradation. The concept and design of the spectrography receiver is presented together with discussion of...
This work concerns the development of an efficient near-field/far-field (NF/FF) transformation technique with spherical spiral scanning suitable for an offset mounted quasi-planar antenna. Such a NF/FF transformation, relying on the nonredundant sampling representations of electromagnetic fields, requires practically the same number of NF data both when the antenna under test (AUT) is onset and offset...
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...
A circularly polarized (CP) hollow hemispherical dielectric resonator antenna (DRA) is presented. The CP DRA that is excited using conformal open half loop metal strips has been studied theoretically and experimentally. The proposed antenna configuration has provided a measured CP and return loss bandwidths of ∼11.i5%, and 10.32% respectively. The DRA has been simulated using Method of Moments (MoM)...
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