U-slot patch antenna

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Design and Analysis of Multiband Asymmetrical U-Slot Patch Antenna

Design and Analysis of Multiband Asymmetrical U-Slot Patch Antenna

ABSTRACT: A multiband U-slot patch antenna, with linear polarization, is designed for WiMAX and WLAN systems. The impedance bandwidths (dB) of 2.3%, 3.4%, 7.2% and 5.2% were achieved at central frequencies 3.3 GHz, 3.7 GHz, 5.3 GHz and 5.8 GHz, with gains of 5 dBi, 7.3 dBi, 7.5 dBi and 8.2 dBi, respectively. The antenna is designed with coaxial feeding technique and the overall dimension is around 50X50 on FR4 substrate. The simulation results of reflection coefficient, gain, radiation patterns and field distributions are carried and presented in this work with FEM based electromagnetic tool HFSS.
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A Practical Miniaturized U-Slot Patch Antenna with Enhanced Bandwidth

A Practical Miniaturized U-Slot Patch Antenna with Enhanced Bandwidth

parameters in the same values. The simulation result using HFSS is a return loss plot in Figure 3 with solid line. The bandwidth that is resulted in from this plot (solid curve) of Figure 3 is equal to 28.4% from 1.93 to 2.57 GHz. Then there is a decrement in the bandwidth. This change in the bandwidth occurs as the result of two agents, one, reduction in the probe diameter, and the other, reduction in the maximum return loss of the passband. Although this antenna parameters is only one example of low probe diameter U-slot patch antenna, but it can give us an estimation about how much bandwidth decreases in these cases.
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A Broadband Low Cross-Polarization U-Slot Patch Antenna Array Based on Differential Feed

A Broadband Low Cross-Polarization U-Slot Patch Antenna Array Based on Differential Feed

In this paper, a single layer 4 × 4 U-slot patch antenna array based on differential feeds is proposed to achieve wideband performance and low cross-polarization levels. The 4 × 4 array based on differential feeds is measured by a wideband balun which includes the whole bandwidth of the array and compared with an array having the same structure but based on normal feed. The designed array has more than 12.4% (reflection coefficient lower 10 dB) measured impedance bandwidth with stable 18–19 dBi gain across the band. A better asymmetry of radiation pattern in the E-plane and a lower than − 45 dB cross-polarization levels in the H-plane can be achieved compared with normally-fed array, which make the array have a better performance in radiation pattern. Furthermore, this work is based on a single layer and differentially-fed design, which makes it simple and easily integrated with different devices directly without baluns.
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Design and Implementation of U-Slot Patch Antenna for WLAN Applications

Design and Implementation of U-Slot Patch Antenna for WLAN Applications

The growth of wireless systems and booming demand for a variety of new wireless applications such as WLAN (Wireless Local Area Network), it is important to design broadband and high gain antennas to cover a wide frequency range. The design of an efficient wide band small size antenna, for recent wireless applications, is a major challenge. In applications like high performance aircraft, satellite, missile, mobile radio and wireless communications small size, low-cost fabrication, low profile, conformability and ease of installation and integration with feed networks are the main constraints. Also, with advancement of the technology, the requirement of an antenna to resonate at more than one frequency i.e. multi-banding is also increasing day by day. Here microstrip patch antenna is the best choice to fulfill all the above requirements. Along with that a microstrip patch antenna offers many advantages above other conventional antennas like low fabrication cost, supports both, linear as well as circular polarization etc. Microstrip patch antenna have some disadvantages also like surface wave excitation, narrow bandwidth etc. But bandwidth of a microstrip patch antenna can be improved by various methods like cutting U-slot, increasing the substrate height, decreasing 𝜀𝑟 of substrate etc. Antenna array can also be used to improve the bandwidth .
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Enhancement of Bandwidth Using U Slot Micro strip Patch Antenna Operating at TM02 Mode

Enhancement of Bandwidth Using U Slot Micro strip Patch Antenna Operating at TM02 Mode

Indoor wireless links have intrinsic characteristics that affect the system performance, such as the multipath effect that causes signal fading, and interference effect from adjacent cells that degrades the bit error rate. From the physical layer perspective, one solution to combat these impairments is the use of directional antennas rather than the traditional omnidirectional ones [1]. They have the ability to confine the power in certain directions instead of scattering the power everywhere. As a result of less power loss toward unwanted directions, the multi-path and interference effects are reduced. Directional antennas can be single or dual/multi- beam. Dual/multi-beam antennas are antennas that have more than one directive beam from a single aperture. These antennas are useful for indoor wireless systems which require coverage of multiple areas [2], as they reduce the required number of antennas and are found to improve the link quality [3], resulting in easier net-work deployment. Micro-strip antennas have been widely used in many modern communication systems, because of its robustness, planar profile, and low cost. Most of these antennas operate at their fundamental mode, which gives a broadside beam [4]. Micro-strip antenna operating at the higher order mode has dual symmetric radiation beams, with each beam directed at respectively [5]–[7]. It is well known that the major drawback of a micro-strip antenna is its narrow bandwidth (3%). One of the popular techniques for broadening the patch antenna bandwidth is to incorporate a U-slot on its surface as proposed in [8] and [9]. However, the U-slot technique was studied only at the Fundamental mode of the patch [10]. To the best of authors’ knowledge, there is no published report on the study of the U-slot patch Antenna excited at the higher order mode.
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A 28-GHz U-slot Microstrip Patch Antenna for 5G Applications

A 28-GHz U-slot Microstrip Patch Antenna for 5G Applications

Abstract— In this study, a 28-GHz U-slot rectangular microstrip patch antenna for 5G Applications is proposed. The U- slot antenna concept has been used in patch antenna designed to reduce antenna size.The U-slot patch antenna structure consists of a patch, U-shaped slot, a ground plane and coaxial feed lines. The proposed antenna is designed and fabricated to meet the best possible result using a simulation software: Ansoft HFSS (High Frequency Structure Simulator) software version 15.0. Microstrip patch antennas are widely used because of their several advantages such as light weight, low volume, small size and low fabrication cost. The proposed antenna was measured and compared with the simulation results to prove the reliability of the design. The performance of the designed antenna was analyzed in term of gain, return loss, VSWR, and radiation pattern at frequency is 28 GHz.
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Optimization and Return loss Reduction Of Micro strip Patch Antenna

Optimization and Return loss Reduction Of Micro strip Patch Antenna

Two U- slots are cut on the upper patch of the stacked patch microstrip antenna which is coaxially fed. U slot behaves as a serial capacitor thus the inductive behaviour of probe feed can be compensated and impedance matching can be optained. The main advantages of U-slot patch antenna is that it produces broad band characteristics with a single and simple topology. The variations of U-slot patch antenna paramaters such as slot widht, slot lenght, height and size of the patch, probe location and substrate permitivity can dramatically change the antenna’s behaviour. Analytical procedures have not been develop to design U-slot patch antenna. Dimensional invariance and resonance frequency approaches are well known empirical design procedures in literature. These approaches are useful for initial designs and desired antenna behaviour can be obtained after some optimizing and tuning process
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Design and Optimization of Multiple U  slot Microstrip Patch Antenna for Wireless Applications

Design and Optimization of Multiple U slot Microstrip Patch Antenna for Wireless Applications

Four U slot antenna is obtained by making four u slots in patch. Initially simple patch antenna is taken and four u slots are cut one by one to analyze effect. Initially single u shaped antenna is designed and results are obtained. This design is modified by cutting four u slots to form u slot ring like structure. Parametric analysis has been done. It is found that when no DGS is applied bandwidth of antenna was small. This antenna resonates at 4.6 GHz, 6.7 GHz and 8.6 GHz with return loss of -13.7 dB, -30.7 dB, -14.30 dB, good gain of 1.38 dBi, 3.32 dBi and 2.34 dBi and bandwidth of 150 MHz, 1200 MHz and 250 MHz at 4.6 GHz, 6.7 GHz and 8.6 GHz. This antenna can be useful for different applications in C band , WLAN, Defence and secure communation and IMT band.
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A Comparative Analysis of a Circularly Polarized Microstrip Patch Antenna with & Without U Slot

A Comparative Analysis of a Circularly Polarized Microstrip Patch Antenna with & Without U Slot

By cutting a symmetrical U-slot with equal arms in a square patch with truncated corners, an axial-ratio (AR) bandwidth of about 4% can be obtained [6]. Another design is achieved by loading an unsymmetrical u slot on a square patch [7]. The unequal arms of the U-slot produce the orthogonal currents for CP radiation, and an axial-ratio bandwidth of about 4% is also obtained [5]. If the patch shape is like the square or the circle, the bandwidth is the same and proportional to its size. The deviations start when the shape changes drastically and becomes a narrow or wide rectangle. If the radiation edge becomes narrow, decreases the radiation loss and increases the antenna Q, reducing the bandwidth. For a patch with a large radiating edge, the reverse is true [8].
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Parametric Analysis of Multiple U Slot Microstrip Patch Antenna for Wireless Applications

Parametric Analysis of Multiple U Slot Microstrip Patch Antenna for Wireless Applications

Nowadays communication plays an important role in the worldwide society and the communication systems are rapidly changing from wired to wireless. Communication can be broadly defined as the transfer of information from one point to another. A communication system is usually required when the information is to be conveyed over a distance. The transfer of information within the communication system had commonly achieved by superimposing the information signal onto high frequency carrier to form an electromagnetic wave. At the required destination, the modulated signal was then received and the original information signal can be recovered by demodulation. Over the years, techniques have been developed for this process using electromagnetic carrier waves operating at radio frequencies as well as microwave frequencies [6]. In high performance point to point application where size, weight, cost, performance and ease of installation are very much required, microstrip antennas are preferred. They are currently one of the fastest growing segments in the telecommunications industry. Since early days, there has been tremendous worldwide activity aimed to develop an efficient antenna. The patch antennas have been used in various fields such as mobile communication, radar, GPS system, Bluetooth, space technology, aircraft, missiles, satellite communication etc. Narrow bandwidth and low gain are two major disadvantages that limit the applications of microstrip antennas. Thus, the size reduction with gain and bandwidth enhancement has become a major consideration in the microstrip patch antennas. Several techniques have been suggested to improve the bandwidth and gain of microstrip antenna [3].
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Design of Dual Band U-Slots Circular Patch Antenna on Fr4 			Substrate

Design of Dual Band U-Slots Circular Patch Antenna on Fr4 Substrate

This paper presents design andanalysis of probe fed dual U-shape slots antenna. The proposed antenna has simple structure consisting two U-shape slot on a circular patch of radius 13.1mm.The patch is designed on circular shape FR4 substrate material of radius 13.2mm,with height of 5mm and whose permittivity is 4.4.By using only single patch a high impedance bandwidth and dual bands are achieved. Simulated results shows that the return loss is - 24.65dB at the center frequency of exactly 7GHz and the simulated impedance bandwidth (VSWR<2) is 24% .The antenna is designed and simulated using HFSS software and theoretical results gives good agreement with simulated results. Return loss, 3D gain, radiation pattern are simulated for the proposed designed antenna was presented.
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Multi Band Curved U Slot Edge Feed Triangular  Micro strip Patch Antenna

Multi Band Curved U Slot Edge Feed Triangular  Micro strip Patch Antenna

The basic structure of the proposed antenna consists of 3 layers. The lower layer, which constitutes the ground plane, covers the partial rectangular shaped substrate with a side of 33×38 mm. The middle substrate, which is made of FR4 epoxy resin, has a relative dielectric constant є r =4.4 and height 1.5 mm. The upper layer,

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Gain Enhancement of Micro strip Patch Antenna with Slotting Technique

Gain Enhancement of Micro strip Patch Antenna with Slotting Technique

A theoretical review on micro strip patch antenna is presented in this paper. Some effect of disadvantages can be minimized. Increasing gain ,bandwidth and lowering VSWR for making patch antenna for application specific is achieved by introducing slots in the geometries of patch antenna. As compared to conventional micro-strip antenna gain is improved, VSWR is reduced so thereby overall efficiency of the antenna increases. Different slots shaped are compared with without slot and it is found that bandwidth of conventional rectangular micro strip antenna can be enhanced respectively using A, C, E, L, and U-patch over the substrate. The E-shaped patch antenna has the highest Gain followed by A, C, L-shaped patch antenna and U-shaped patch antenna.
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Design Of Antenna With Notch Filter To Support Multifunction Operation Standards In Wireless Communication Systems

Design Of Antenna With Notch Filter To Support Multifunction Operation Standards In Wireless Communication Systems

A few years when the first investigation on ultra-wideband (UWB) wireless system, considerable project efforts are place into the design of UWB antenna and systems for communications. This UWB antenna is essential for providing wireless broadband communications supported the utilization of terribly narrow pulses on the order of nanoseconds, covering a really wide bandwidth within the frequency domain, and over terribly short distances at very low power densities. During this project, new models of U slotted UWB antenna proposed by finding out its current distribution characteristics. The wideband behaviour is due to the actual fact that the currents on the perimeters of the slot introduce an extra resonance, which, in conjunction with the resonance of the most patch, turns out an overall broadband frequency response characteristic. This antenna is considerable small than others listed within the references, that its size is a smaller amount than a wavelength, compact, and appropriate for several UWB applications. [15]
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A New Dual-Band Microstrip Antenna with U-Shaped Slot

A New Dual-Band Microstrip Antenna with U-Shaped Slot

with a U-shaped slot. The radiating patch is fed by a broadband electromagnetic coupling probe, known as L-probe. By using the slot, the dual band operation of the antenna can be achieved. In general, the first resonant frequency is associated with the size of the square patch and the second resonant frequency is associated with the U- slot parameters. The other parameters in Fig. 1 (P d , P w , P l , P s )

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Compact Half U-Slot Loaded Shorted Rectangular Patch Antenna for Broadband Operation

Compact Half U-Slot Loaded Shorted Rectangular Patch Antenna for Broadband Operation

In this article, a half U-slot loaded rectangular patch (L × W ) is analyzed using equivalent circuit theory based on model expansion cavity model, in which the performance of half U-slot loaded patch is studied as a function of slot length (L s ), slot width (W s ), notch length (L n ) and notch width (W n ). The theoretical results obtained are compared with the simulated [8] and experimental ones [9].

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Multi Band Double Inverted L Slot Patch Antenna for Wireless Applications

Multi Band Double Inverted L Slot Patch Antenna for Wireless Applications

Microstrip patch antennas are an attractive choice in modern wireless communication because they have advantages such as low profile, conformal, low cost and robust. Microstrip patch antennas are in demand now-a-days for use in wireless applications due to their low-profile structure [1-4]. Therefore they are compatible for embedded antennas in modern wireless devices. Microstrip antennas are thin and conformal. In Satellite communication they have also been used successfully. However, at the same time they have limitations of low gain, narrow bandwidth, single operating bandwidth, and cross polarized radiation. Many research works have been developed for improving these parameters of the conventional microstrip patch antenna (MPA) [5-7]. The concept of multi-band communication, multifunction application and miniaturization has been proposed many years ago. The advantage of multi-band system is that, when there is interference in one band system, the other can still work normally. Another typical advantage is that it can form complementary function. Multi-band slot patch antenna is also useful when one has to simultaneously deal with uplink and downlink data in satellite communications [8]. It has great potential in modern communication systems. During the past decade, multi-band performances at different bands were integrated into one antenna by employing multilayer, cutting slots on the patch. Recently, several techniques have been proposed to enhance the bandwidth. A novel single layer wide-band rectangular patch antenna with achievable impedance bandwidth of greater than 20%has been demonstrated [9]. Utilizing the shorting pins or shorting walls on the unequal arms of a U-shaped patch, U-slot patch, or L-probe feed patch antennas, wideband and dual-band impedance bandwidth have been achieved with electrically small size [10-11]. Other techniques involve employing multilayer structures with parasitic patches of various geometries such as E, V and H shapes, which excites multiple resonant modes. However, these antennas are generally fabricated on thicker substrates. In this paper, multi-band double inverted L-slot patch antenna is proposed for wireless applications. This antenna achieved at central frequencies of 11.3GHz, 12.7GHz, 15.5GHz, 16.3GHz and 17.5 GHz with gains of 4dBi, 2.9dBi, 1.1dBi and 3.7dBi, respectively.
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Broadband Stacked U-Slot Microstrip Patch Antenna

Broadband Stacked U-Slot Microstrip Patch Antenna

Microstrip antennas have become attractive candidates in a variety of commercial applications such as mobile and satellite communications. Traditionally, microstrip antennas suffer from low bandwidth characteristic. Experimentally and theoretically, it has been shown that a coaxially fed patch antenna on a foam substrate of approximately 0.08 wavelength thick can enable an impedance bandwidth of about 33%, by cutting proper U-slot in the patch [1, 2]. Moreover, Lee and Lee [3] have experimentally demonstrated the characteristics of two-layer electro-magnetically coupled rectangular patch and reported that relatively large bandwidth could be obtained when the separation between the two layers was less than 0.15 wavelength. Therefore, in the present paper, a stacked U-slot microstrip antenna is presented for broadband operation. The modal expansion cavity model and circuit theory concept have been used to analyze the antenna characteristics. The details of theoretical investigations are given in the following sections.
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U-Slot Microstrip Patch Antenna for Wireless Application

U-Slot Microstrip Patch Antenna for Wireless Application

The proposed antenna explains and illustrates the simulation of the microstrip antenna with single u-shaped slot on the patch. This antenna is compact, have a flexible structure and easy to use compared with other antennas. Thus, the very low return loss of less than -12dB is achieved which is suitable for the wireless applications and in the c-band of satellite communication systems. This antenna has been simulated for the frequency of 5.5GHz and is well known for its wideband characteristics.

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U Slot Microstrip Patch Antenna

U Slot Microstrip Patch Antenna

[7] David M. Pozar. Considerations for millimeter wave printed antennas. IEEETransactions on Antennas and Propagation, 31(5):740{747, 1983. [8] “ Design of linear ly polar ized r ectangular maicrostrip patch antenna using IE3D/PSO”C. VISHNU VARDHANA REDDY and RAHUL RANA 2009 [9] W. F. Richards, Y. T. Lo, and D. D. Harrison, “An improved theory of Microstrip antennas with applications,” IEEE Trans . Antennas and Propagation, vol. AP- 29, pp,38-46, Jan. 1981.

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