Planar monopole antenna with defected ground plane for UWB application
01 Dec 2011-pp 1-3
TL;DR: A rectangular monopole antenna with defected ground plane for UWB application is analyzed and experimentally studied in this article, where it is found that by making a slot on the ground plane return loss characteristic is improved.
Abstract: In the proposed paper, a rectangular monopole antenna with defected ground plane for UWB application is analyzed and experimentally studied. It is found that by making a slot on the ground plane return loss characteristic is improved. From experimental results, the measured impedance bandwidth of the fabricated structure covers a frequency band from 3 to 11 GHz with the central frequency at 6.9 GHz. Above analysis is done using commercially available CST Microwave Studio 2011 software and with optimized result it is fabricated on FR4 substrate having permittivity of 4.4 and thickness 1.6mm. Comparisons of simulated and experimental results were also done. The antenna exhibits Omni directional radiation pattern with < 2 dBi gain for entire bandwidth are presented.
Citations
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01 Nov 2013
TL;DR: In this article, a planar simple and compact monopole antenna for UWB applications with CPW feeding is proposed, where the radiating patch of the antenna consists of a top-cut half-circle together with a triangle on the lower edge.
Abstract: A planar simple and compact monopole antenna for UWB applications is proposed with CPW feeding. The radiating patch of the antenna consists of a top-cut half-circle together with a triangle on the lower edge. The bottom side of the antenna includes a rectangular defected ground plane with two different symmetrical bevels. By cutting out these bevels on the ground plane, bandwidth coverage of the overall UWB range except 5.4-7 GHz frequency band is provided. To enhance input impedance bandwidth characteristics at 5.4-7 GHz frequency band, dimensions of the triangular part on the lower edge of the patch and top-cut half-circle part on the upper edge are optimized. The overall size of the proposed antenna is 22×20×1 mm3. Simulations are carried out using commercially available ANSYS's HFSS program which uses the finite element method (FEM). Results show that 110% of the impedance bandwidth between 3.6 and 12.2 GHz for VSWR<;2 is achieved. Moreover, antenna has a stable omnidirectional pattern at XZ plane over the frequency band. Also, the presented antenna is fabricated on FR4 substrate and it is measured.
5 citations
01 Jan 2020
TL;DR: In this article, a novel compact monopole microstrip-line-fed Y-shaped patch antenna with an embedded annular ring and L-shaped defective ground plane is presented.
Abstract: In this paper, a novel compact monopole microstrip-line-fed Y-shaped patch antenna with an embedded annular ring and L-shaped defective ground plane is presented. The defective ground shape (DGS) ensures that the antenna would work in the ultra-wideband (UWB) (3.1–10.6 GHz). The multiple slots are made in the ground plane which further enhances the return loss (s11 parameter) for lower frequencies of the band. The design is printed on FR-4 substrate of 22 × 24 mm having permittivity ϵr = 4.4 and thickness h = 1.6 mm. The proposed antenna is designed and analyzed in HFSS software which gives a return loss of 10 dB for the entire ultra-wideband with VSWR lying between 1 and 2 throughout the band. Maximum gain of 5.25 dB is obtained with average being 3.3 dB. With the stable radiation characteristics as described by the radiation patterns of E-plane and H-plane, this antenna will find numerous applications in the new generation of wireless communication systems.
1 citations
Patent•
04 Feb 2020
TL;DR: In this article, an antenna radiation system consisting of a part region and an antenna clearance region is described, where a gap is formed in a metal region, used as reference ground, in the part region, and a switch is arranged at the gap and is used for connecting or disconnecting an original current return path.
Abstract: The invention discloses an antenna radiation system and a communication terminal. The antenna radiation system comprises a part region and an antenna clearance region, wherein a gap is formed in a metal region, used as reference ground, in the part region, a switch is arranged at the gap and is used for connecting or disconnecting an original current return path, and a current passes through an edge of the gap so as to extend a reference ground current return path when the original current return path is disconnected by the switch. When the switch is switched off, a reference ground current cannot circulate through the original current return path while circulates along the edge of the gap, the length and the direction of a current return path both are changed, thus, the effective length of the reference ground is increased by combination of the gap switch, the direction of the reference ground current is also changed, and the omnibearing radiation of the antenna can be improved; and apparently, antenna wiring is not needed to be changed in the antenna radiation system, the design difficulty is greatly reduced, the antenna radiation system is free from the limitation of the size ofthe part region, and the flexibility is higher.
References
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TL;DR: By using a coplanar waveguide (CPW) feed with a widened tuning stub, a square slot antenna for broadband operation is presented in this paper, where the authors show that the impedance matching for the proposed antenna strongly depends on the location of the tuning stub in the square slot, and the impedance bandwidth is mainly determined by the width and length of the tuned stub.
Abstract: By using a coplanar waveguide (CPW) feed with a widened tuning stub, a square slot antenna for broadband operation is presented. Experimental results show that the impedance matching for the proposed antenna strongly depends on the location of the tuning stub in the square slot, and the impedance bandwidth is mainly determined by the width and length of the tuning stub. By properly choosing the location and the size of the tuning stub, a wide impedance bandwidth of 60% can be obtained, which is about 1.9 times that of a conventional CPW-fed square slot antenna with a simple tuning stub. Details of the experimental results are presented and discussed.
394 citations
TL;DR: In this article, a printed wide-slot antenna fed by a microstrip line with a rotated slot for bandwidth enhancement is proposed and experimentally studied, and the measured impedance bandwidth, defined by 10 dB return loss, can reach an operating bandwidth of 2.2 GHz at operating frequencies around 4.5 GHz.
Abstract: In this paper, a printed wide-slot antenna fed by a microstrip line with a rotated slot for bandwidth enhancement is proposed and experimentally studied. Impedance, radiation, and gain characteristics of this antenna are presented and discussed. From experimental results, the measured impedance bandwidth, defined by 10 dB return loss, can reach an operating bandwidth of 2.2 GHz at operating frequencies around 4.5 GHz, which is about four times that of a conventional microstrip-line-fed printed wide-slot antenna. Also, the antenna gain within the operating band is measured and studied, and a 2-dB gain bandwidth of at least 1 GHz is achieved.
274 citations
"Planar monopole antenna with defect..." refers background in this paper
...Some of the antennas [6]-[11], are providing broad bandwidth but not covering the entire UWB band, so can’t suitable for UWB application....
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TL;DR: In this paper, a microstrip-line-fed printed wide-slot antenna with a fractal-shaped slot for bandwidth enhancement is proposed and experimentally studied, and it is experimentally found that the operating bandwidth can be significantly enhanced, and the relation between the bandwidth and the iteration order (IO) and iteration factor (IF) of the fractal shapes is investigated.
Abstract: Microstrip-line-fed printed wide-slot antenna with a fractal-shaped slot for bandwidth enhancement is proposed and experimentally studied. By etching the wide slot as fractal shapes, it is experimentally found that the operating bandwidth can be significantly enhanced, and the relation between the bandwidth and the iteration order (IO) and iteration factor (IF) of the fractal shapes is experimentally studied. Experimental results indicate that the impedance bandwidth, defined by - 10 dB reflection coefficient, of the proposed fractal slot antenna can reach an operating bandwidth of 2.4 GHz at operating frequencies around 4 GHz, which is about 3.5 times that of a conventional microstrip-line-fed printed wide-slot antenna. It also achieved a 2-dB gain bandwidth of at least 1.59 GHz.
216 citations
TL;DR: In this paper, a coplanar waveguide fed square slot antenna loaded with conducting strips is proposed and experimentally studied, and the obtained results show that the impedance bandwidth, determined by 10-dB return loss, of the proposed slot antenna can be greater than 60%.
Abstract: A novel broadband design of a coplanar waveguide fed square slot antenna loaded with conducting strips is proposed and experimentally studied. The obtained results show that the impedance bandwidth, determined by 10-dB return loss, of the proposed slot antenna can be greater than 60%. The design considerations for achieving broad-band operation of the proposed slot antenna are described, and experimental results are presented.
193 citations
42 citations
"Planar monopole antenna with defect..." refers background in this paper
...All these designs mentioned above provide broad bandwidths but some of them having large sizes [2]-[5], which restrict their practical applications, while others are having very complicated structure as in [4],[5] which makes the structure so difficult to design and increases the cost of antenna....
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...Numerous types of antennas have been proposed during the past few years to cover the whole UWB frequency band [2]-[11]....
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