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The most important characteristic of a multipath radio channel is its impulse response. For wideband radio channels in the lower part of the THz-band (Low-THz, 300 GHz–1 THz), the coefficients of this characteristic depend on the frequency, and are determined by the phase changing of the primary and delayed rays, and the variance of the reflection coefficients of electromagnetic waves. In this work...
This paper presents the design of a planar Quasi-Yagi antenna capable of achieving high Front-to-Back ratio (i.e. FTBR > 34 dB), high gain (i.e. > 6.4 dBi) and relatively wide bandwidth (i.e. up to almost 1 GHz). This antenna is designed to cover the 2.45 GHz ISM band. The overall dimensions of the antenna are 69 × 64 × 1.575 mm3. The antenna is made up of 5 director elements, 1 driven dipole...
This paper presents a novel circularly polarized (CP) printed antenna with wide bandwidth and wide axial ratio (AR) beamwidth. The presented antenna is realized by bending a linearly polarized dipole into “S” shape with variable line width, which achieves circularly polarized radiation. Key parameters in designing such an “S” antenna are discussed and studied. It is found that this “S” antenna has...
In this paper, origami antennas are proposed for military field deployment. A high gain tetrahedron origami antenna (antenna #1) is introduced and then extended to circularly polarized antenna (antenna #2) for military satellite applications. Both the antennas are realized on paper substrate by using origami tetrahedron structure. The radiating aperture of antenna #1 comprises a triangular shaped...
In this paper, a slotted rook shaped novel wide band microstrip patch antenna suitable to be employed for C-Band satellite downlink, Radio Altimeter, IMT, WiMAX applications has been proposed. The proposed antenna is resonant at 4.3 GHz with an impedance bandwidth of 1.419 GHz (3.181 GHz to 4.6 GHz) and a return loss of −53.94dB. The Teflon is used as substrate for designing the proposed antenna having...
A new wideband compact planar microstrip antenna with defected ground structure is presented. The compact size of antenna is 57 mm × 46 mm × 1.59 mm. Defected ground structure antenna has minimum return loss of −24.77 dB and −19.04 dB at operating frequency 5.57 GHz and 3.51 GHz respectively. This antenna provides percentage bandwidth of 52%, ranging from 3.4 GHz to 5.9 GHz with constant gain. This...
This paper describes the effect of wire with small circular ground plane size (radius < λ/20) for normal mode helical antenna at which resonance condition is achieved without using any external impedance matching network. A comparative study of variation in performance of helical antenna with respect to variation in thickness of wire and ground plane size at 1.8 GHz is carried out using simulation...
This paper presents an UWB monopole antenna with rectangular slots on the patch and defected ground surface. The proposed antenna has a dimension of 25mm∗30mm∗1.6mm fabricated on FR4 dielectric substrate material with dielectric constant (εr) 4.4. The microstrip feed is incorporated to monopole with rectangular slots on both the ground plane and patch which produce the extra resonance frequencies...
This paper presents a U-shaped stub fed with coplanar wave guide (CPW) line and microstrip line to achieve ultra-wideband characteristics. Two kinds of antenna prototypes are designed, fabricated and measured. A1: CPW-fed U-shaped stub placed in a rectangular wide slot and A2: microstrip line fed U-shaped open stub. Both the antennas are designed on FR4 Epoxy substrate of thickness 1.6mm. Simulated...
Massive MIMO has shown the great potential in improving the achievable rate with a very large number of antennas. However, several critical challenges in designing the analog front-end and coordinating the large-scale antenna array have to be carefully addressed. Does there exist an alternative that can achieve similar system performance to massive MIMO with a simpler design? In this paper, we show...
In this paper, a novel dielectric resonator antenna (DRA) design for ultrawideband (UWB) applications is proposed. A hybrid T-shaped DRA is excited by a conformal trapezoidal shaped patch feeding mechanism. It is observed that by introduction of air gap and use of two different DRA materials, Q-factor can be reduced and in turn UWB can be achieved. A rigorous parametric study of the proposed antenna...
In this article a microstrip antenna is reported for wideband wireless communication application. The main radiator of this design is printed in the front side of a piece of FR4 dielectric substrate while a finite ground plane is etched on the rear side. To achieve wide operating band, the ground plane is reduced to partial one and defected by inserting slots on its upper edge. It is found that this...
This paper proposes and analyses a circularly polarized square patch antenna with an improved axial ratio bandwidth covering a frequency of 1.665GHz to 1.845GHz. The antenna attains circular polarization using the perturbations — truncated corners and well-shaped slots embedded on the patch. The results indicate that the antenna attains desirable axial ratio (below 3dB) for a wide elevation range...
This paper presents a lightweight and simple structure of slotted circularly polarized (CP) patch antenna using conductive textile. ShieldIt Super is used as a conductive textile and felt is used as a substrate of the antenna. The prototype is designed with a total dimension of 36 mm × 36 mm and spaced by a 3 mm thick felt fabric for Body-centric Wireless Communication (BCWC) operating in the 5.2...
In this paper, a MIMO antenna of size 52 × 35 × 1.6 mm3 for UWB applications is designed and analyzed. A separate ground plane antenna elements are set beside each other on top of FR-4 substrate. Each single antenna element is designed through varying the main six parameters that describe the super-formula. The antenna elements are fed through a microstrip feeding line. A full-wave simulator is used...
Notch characteristic is implemented in a wideband four-arm sinuous antenna with a nominal gain of 4.5 dBi over an operational bandwidth of 2–7 GHz. The notch band is introduced at 4.9 GHz with a fractional bandwidth of % 2 at 4.9 GHz, the center frequency of notched band. The sinuous antenna is backed with a metallic cavity having a low profile of 30 mm. The antenna is working with two orthogonal...
This letter proposed a 150 MHz C-shaped meander line inverted-L antenna, which can be embedded in land mines. First, a radiation element of monopole antenna has been transformed to an inverted-L form by turning it to be parallel with the ground. Then, it was designed to a size allowing insertion in a land mine by designing the radiating element being parallel with the ground into C-form by using a...
In this article, we have proposed a novel rectangular microstrip slot antenna with frequency reconfigurable characteristics for wireless applications. With the aid of two switches the reconfigurable characteristic of antenna is achieved thus enabling it to work in multiple modes. By making these switches ON and OFF, the antenna's frequency of operation can be varied. The antenna has a single band...
A coplanar waveguide (CPW) fed circularly polarized monopole antenna is presented. The monopole antenna is placed inside a hexagonal shaped slot which is acting as a ground plane. A pair of L-shaped stubs are placed diagonally inside the slot. In order to enhance the impedance bandwidth a spiral discontinuity is created in the grounded ring, near to the edge of the L-stub. The measured result shows...
In this article, a printed planar low VSWR monopole antenna with a new modified ground plane for ultra-wideband (UWB) and 2.6 GHz LTE-band applications is presented. The dimensions of proposed antenna structure are optimized to achieve low VSWR performance. The antenna is fabricated on a low cost FR4 epoxy substrate and tested. The proposed antenna return loss is below −15 dB within bandwidth 2.5–13...
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