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U Slot Microstrip Patch Antenna

U Slot Microstrip Patch Antenna

Fig 3 shows the return loss for the single u-slot antenna which is the simulated result. From the Fig 3, it can be shown that the U-slot microstrip patch antenna at 5.5GHz results in the broadening the bandwidth of the antenna. The graph is plotted for frequency in GHz versus return loss in dB. The graph is plotted for the frequency ranges from 4.50GHz to 6.50GHz and the return loss is shown from 0dB to -14dB.

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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

The single-layer probe-fed U-slot patch antennas have been extended to circularly polarized radiation. A U- shaped slot (with 1-mm width) is cut in the truncated patch. The function of the U-slot is to introduce a capacitance that can suppress the inductance due to the vertical feeding probe so as to enhance the impedance and axial-ratio bandwidths. Moreover, the design has a relatively wider axial ratio bandwidth when compare to other single-fed CP microstrip antennas. Figure 3 shows the front view of proposed U-Slot antenna.
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Design of Reconfigurable Monopole Antenna with Switchable Dual Band-Notches for UWB Applications

Design of Reconfigurable Monopole Antenna with Switchable Dual Band-Notches for UWB Applications

Abstract—A reconfigurable antenna with on-demand single-band or dual-band rejection capability for ultra-wideband (UWB) applications is presented. A modified monopole structure is integrated with a U-shaped slot and an open-ended slot to realize band-rejection. The antenna operates in four modes: a full UWB (3.1–10.6 GHz) coverage antenna, a UWB antenna with a single-band WiMax or wide local area network (WLAN) rejection, and a UWB antenna with dual-band WiMax/WLAN rejection. On-demand single and dual-band rejections are implemented by controlling two slots using two PIN diodes. Thus, the adopted control technique is quite easy and requires low operating power. Details of the design process and reconfiguration mechanism are presented. The band-rejection performance is explained by return loss and surface current distribution at single-band mode. A prototype is built on a Rogers substrate and tested to validate the performances. The antenna exhibits stable radiation characteristics and almost flat gain responses across the whole band, while significantly gain reduction is achieved at the rejected bands. Therefore, this antenna is suitable for high-performance UWB systems in WiMax/WLAN dense environments with the aim to improve signal quality, system capacity, and communication efficiency.
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Dual-Band Circularly Polarized Slot Antenna for WiMAX
/WLAN Application

Dual-Band Circularly Polarized Slot Antenna for WiMAX /WLAN Application

In this letter a novel symmetrical U-slot antenna optimized for simplicity in design and feeding is proposed for dual-band CP application. Compared to the previous U-slot CP antennas [8–10], the symmetrical U-slot is adopted, and it can achieve dual-band CP performance together with L-slot only using single metallic layer. Details of the proposed antenna design are described in the following section, the simulated results are carried out using a commercially available software package HFSS. Also the measured data of the obtained impedance and CP performance are presented and discussed. The dual-band antennas can work at the designated frequency band: world interoperability for microwave access (WiMAX) service from 3.3 to 3.7 GHz, and 5.15 to 5.35 GHz of the wireless local area network (WLAN) for IEEE 802.11a in the USA.
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Comparative Analysis of Single Slot and U Slot Antennas for Satellite Applications

Comparative Analysis of Single Slot and U Slot Antennas for Satellite Applications

K.F Lee et al [12] presented a method of using U-slots to design dual-band and triple-band patch antennas. So they start with a broadband patch antenna, which can consist of more than one patch. When a U-slot is loaded in one of the patches, a notch is introduced into the matching band, and the antenna behaves as a dual-band antenna. If another U- slot is loaded in the same patch or in another patch, then it results in triple-band antenna. This method is applicable for the L-probe-fed patch, the M-probe fed patch, and also for the coaxially fed and aperture-coupled stacked patches. It is noted that the gain and pattern of the dual band and triple-band antennas are very much similar to those of the original broadband antenna. Amit. A. Deshmukh and K.P Ray [13]. Analyzed that U-slot and its variation, and concluded that a half U-slot, have been used to increase the bandwidth (BW). An extensive study for the broadband behavior for, half U- slot, U-slot and double U-slot cut rectangular MSAs (RMSAs) is demonstrated. Therefore it has been observed that U- slot and half U-slot cut patches, does not introduce any additional mode, but it alter the fundamental and higher order mode resonance frequencies of the patch to yield broadband response.
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U-Slot Microstrip Patch Antenna for Wireless Application

U-Slot Microstrip Patch Antenna for Wireless Application

ABSTRACT: The main objective of this paper is to simulate and design a single u-shaped microstrip patch antenna with operating frequency of 5.5GHz. This type of antenna has to be designed using a substrate having a low dielectric constant in order to achieve low return loss. The microstrip antenna consists of the rectangular patch on the top of the dielectric substrate and over which a u-shaped slot has been made to reduce the size of the antenna. The reduction in the size of the antenna results in improved gain and the return loss of the antenna. Therefore, the single u-shaped microstrip patch antenna has a broad bandwidth and can be used for wireless applications. The antenna has been simulated using HFSS (High frequency synthetic simulator) software, a 3D simulator which shows the accurate simulated result compared with other simulation software.
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U-slot Loaded Rectangular Patch Antenna for Dual Band Operation-

U-slot Loaded Rectangular Patch Antenna for Dual Band Operation-

Today, the state of the art antenna technology allows the use of different types and models of antennas,depending on the area of application considered. Microstrip antennas are now extensively used in various communication systems due to their compactness, economical efficiency, light weight, low profile and conformability to any structure. However, microstrip patch antenna is limited by its inherent narrow bandwidth. Therefore, this problem has been addressed by researchers and many configurations have been proposed for bandwidth enhancement [1-3]. Several patch designs with single feed, dual frequency operation have been proposed recently [4-7]. When a microstrip patch antenna is loaded with reactive elements such as slots, stubs or shorting pin, it gives tunable or dual frequency antenna characteristics [5]. A rigorous solution to the problem of a rectangular microstrip antenna which is the most widely used configuration because its shape readily allows theoretical analysis [8]. Also it is found that the substrate permittivity is a very important factor to be determined in microstrip antenna designs [9]. In this paper, a rectangular microstrip patch antenna with U-shaped slot is presented. The proposed antenna can completely cover two bands. The proposed antenna provides a significant size reduction. Dual frequency is tuned by changing the dimensions of the slot. In this paper the simulation resultants and the performance analyses using Matlab, and Ansoft HFSS software of the proposed rectangular microstrip patch antenna with U–shaped slot is presented, different parametric studies have allows and the effect of the various antenna parameters on the return loss and the radiation of the proposed antenna are given.
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Design and Analysis of Multiband Asymmetrical U-Slot Patch Antenna

Design and Analysis of Multiband Asymmetrical U-Slot Patch Antenna

Recently, the increasing demand for wireless communication services has stimulated the need for antennas which can operate at more than one frequency band. Multi band antennas are more reliable and required when the reserved place to lay the antenna is too little to fit in. Multiband Antennas are very desirable for current wireless applications as they can cover multiple frequencies using a single antenna. However, fixed multiband antenna usually requires complicated filters with inflexible requirements to improve their out-of-band noise rejection [1-4]. The filter usually bulky and can add complexity to any communication systems. As a solution to these disadvantages, a reconfigurable antenna can achieve a better out of band noise rejection [5-6]. Moreover, modern wireless communication systems relying on multiband reconfigurable antennas are becoming more popular for their ability to serve multiple standards and applications using a single compact antenna allowing a reduction in the dimensions of the wireless device [7-9] and more space to integrate other electronic components. In this article, we proposed a microstrip co-axial fed multiband antenna operating at different frequencies, which includes the wireless communication applications [10-12].
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A U-Shaped Meandered Slot Antenna for Biomedical Applications

A U-Shaped Meandered Slot Antenna for Biomedical Applications

To design an antenna for biomedical applications, one main consideration to be engaged is that the size of the antenna should be small, and it performs good functionality. Microstrip patch antennas offer favourable advantages such as compact size, low cost and easy manufacture. So these antennas are the strong candidates to be used for biomedical applications. In this paper, a U-shaped meandered slot microstrip patch antenna resonating at 2.4 GHz frequency is proposed. Based on [24], a single frequency omnidirectional pattern can be obtained using a U-shaped structure. The proposed antenna works in the ISM (industrial Scientific and Medical) band. Due to its wide bandwidth characteristics, this antenna can also be used in weighing machine for the purpose of remote health monitoring. It implies that if the frequency gets shifted from its original value, it will be within that frequency range because of antenna’s wideband features. So, this antenna can be used for remote health monitoring as well as weight monitoring.
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A modified bow tie antenna with U-shape slot for Wireless applications

A modified bow tie antenna with U-shape slot for Wireless applications

The geometry of the bow tie antenna & its dimensions are demonstrated in fig.1. The designed antenna has a single layer dielectric substrate & very simple structure. Hence, the essential parameters for the design are: f = 1- 6GHz, = 4.4 and h = 1.6mm. The higher substrate thickness with FR4 epoxy is very efficient comparable to other substrates. It reduces the return loss peaks to make antenna more efficient. In other parameters Loss tangent ( ) = 0.02 and lande factor G = 2. These both parameters are also related with dielectric substrate .
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Bandwidth Enhancement of Microstrip Line and CPW-Fed Asymmetrical Slot Antennas

Bandwidth Enhancement of Microstrip Line and CPW-Fed Asymmetrical Slot Antennas

profile, low cost, easy fabrication, and wide impedance bandwidth. In these type of antenna design, different configurations are introduced for bandwidth enhancement, such as H-slot [8], T-slot [9], E-slot [10], wide rectangular slot with U shaped tuning stub [11], open L-slot [12], wide slot [13], multi-via holes [14], rectangular stub to the circular radiating Patch [15]. When the antenna is fed by a microstrip line, misalignment can result because etching is required on both sides of the dielectric substrate but there is no alignment error in CPW-fed slot antenna as the slot and the feed is on the same plane. In antenna design the main challenge is to develop techniques to increase the bandwidth without significantly increasing their size. This can be accomplished by increasing the number of resonances of single resonant antenna such as a half-wavelength slot.
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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

It is derive that the resonant frequency is inversely proportional to the slot length and feed point and at the same time as it increases with increasing the coaxial probe feed radius and slot width [8]. In recent years, some papers were reported for Dual/triple band operation by using single/double U slot in the microstrip antenna. It is seen that the applications which require dual frequency operation with small frequency ratio were designed by using the U slot in a wideband micro strip antenna [9]. Micro strip antennas are suffer from low impedance bandwidth characteristics to increase 5G system applications. To avoid this suffering of antennas, there have been various bandwidth enhancement techniques like coplanar parasitic patches, stacked patches, or novel shapes patches such as the U and H -shaped patches. Here in this design one method is used, called as special feed networks or feeding techniques, to compensate for the natural impedance variation of the patch. To avoid the use of coplanar or stacked parasitic patches we can do the etching process on the patch with U -slot, which increases either the lateral size or the thickness of the antenna. So, sometimes with enhancing the impedance bandwidth, changing the current distribution on the micro strip patch more than one resonant frequency is obtained. In 1995, two scientists named as Huynh and Lee was presented a broad band single layer probe fed patch antenna with a U -shaped slot on the surface of the rectangular patch [10-13].
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A printed staircase serrated CPW antenna 
		for UWB applications

A printed staircase serrated CPW antenna for UWB applications

Next advancement in technology has come through the development of slots in antennas. With varying sizes and shapes of the slots in the antenna we can bring changes in impedance bandwidth and also the antenna working frequency range will be increased. The design of slot antennas is simpler and also they are robust in nature [9-12]. We can determine the radiation pattern distribution from the shape and size of the antenna.Previously L-shaped slot antenna, U-shaped slot antenna, and rectangular slot antenna with stubs and circular slot antennas were designed, but from the literature review it has been concluded that these antennas have a drawback of complex structure and limited bandwidth. In printed slot antennas alignment problems occur due to multiple layers of the antenna, hence we have adapted CPW feed line technique which is a single layer
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Design and Development of Corner Truncated U and Inverted U-Slot Multiband Tunable Rectangular Microstrip Antenna

Design and Development of Corner Truncated U and Inverted U-Slot Multiband Tunable Rectangular Microstrip Antenna

low dielectric constants, thicker substrates, use of impedance matching networks, multi resonators, multi layer structures and utilizing the air gap between the layers, meandered ground plane, slot loading, stacked shorted patch, feed modification [4–14], etc. Also, the methods proposed in the literature to enhance the gain of microstrip antennas use parasitic patch, array antenna [15, 16], etc. These methods are effective at the cost of increased size of the antenna. The demand of multiband antennas is fulfilled by cutting slots of different geometries, such as bow-tie, rectangular, square ring, annular ring, on the radiating patch [17–20]. But a single antenna having wide impedance bandwidth and better gain with tunable multibands property is found to be rare in the literature.
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A New Dual-Band Microstrip Antenna with U-Shaped Slot

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

Microstrip antennas are widely used in many applications due to their low profile, low cost and ease of fabrication. In some applications it is desired to have a dual band or multiband characteristics. These characteristics can be obtained by coupling multiple radiating elements or by using tuning devices such as varactor diodes [1, 2]. However, these methods make antenna more complicated. A simple method to achieve the dual band characteristic in a microstrip antenna is embedding a slot in the patch as the structure proposed in [3] in which the radiating patch includes a pair of step-slots. In microstrip antennas, embedded slots can also be used to enhance the impedance bandwidth of a single band antenna. A circular arc slot [4] and a U-shaped slot [5] have
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On the Design of Circular Fractal Antenna with  U Shape Slot in CPW Feed

On the Design of Circular Fractal Antenna with U Shape Slot in CPW Feed

From Figure 2, it can be seen that current is mainly distributed on the upper edge of ground plane and along the edge of antenna disc, which explains why the per- formance of the antenna is critically dependent on the gap h between ground and patch. The parameter h is very critical parameter for proper coupling from feed line to patch which effect the UWB characteristic. The proposed fractal monopole antenna has been simulated for various values of gap. The simulated results have been shown in Figure 5. It has been observed from graph that gap (h) between ground and patch effects the lower end fre- quency and bandwidth. The fourth iterative proposed fractal antenna has been fabricated with gap h = 0.4 mm, 50 Ω feed with W = 3.2 mm and g = 0.5 mm.
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A Practical Miniaturized U-Slot Patch Antenna with Enhanced Bandwidth

A Practical Miniaturized U-Slot Patch Antenna with Enhanced Bandwidth

Here we present a Symmetric U-slot patch antenna with maximum return loss of − 10 dB and probe diameter of 1.27 mm in the same frequency as the antenna in Section 2.1. In order to reduce the maximum return loss of the passband, in Figure 1 let W s = 23.4 mm,

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Design of Single-Band to Hexa-Band Bandstop Filters

Design of Single-Band to Hexa-Band Bandstop Filters

In this paper, six Bandstop filters are presented. The proposed Bandstop filters are useful for the Single-Band to Hexa-Band applications. Single-Band BSF (SB-BSF) is designed by using two folded U-slots, Dual-Band BSF (DB-BSF) is designed using three folded U-slots, TB-BSF is designed using three different sizes folded U-slots, QB-BSF is designed using three different sizes folded U-slots in microstrip line and two folded U-slots in the ground plane. Penta-Band and Hexa-Band BSFs are designed using three different sizes folded U-slots in microstrip line and ground plane with one coupled S-type resonator. The proposed designed methodology is simple and systematic. Proposed Multi-Band Bandstop filters are useful for IEEE 802.11a WLAN band in the ranges (5.15–5.25 GHz, 5.25–5.35 GHz, 5.47–5.725 GHz, 5.725–5.825 GHz), as well as IEEE 802.11b band in the range 2.412–5.484 GHz, WiMax (3.4 GHz), GSM (1.8 GHz), and S-band (2.0 and 2.2 GHz) for Mobile Satellite Service (MSS) networks in connection with Ancillary Terrestrial Components (ATC) [19]. Finally, some of the Multi-Band Bandstop filters are fabricated, and their performances are measured to verify the concept.
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U-slot Loaded Rectangular Patch Antenna for Dual Band Operation-

U-slot Loaded Rectangular Patch Antenna for Dual Band Operation-

Moreover, securing the channel having software applications like HMI and SCADA without security considerations in design time lead to exploiting the application via a secure channel.. Ta[r]

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