rectangular U-slot patch antenna

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Truncated Rectangular Microstrip Antenna with H and U Slot for Broadband

Truncated Rectangular Microstrip Antenna with H and U Slot for Broadband

In this paper we present a novel approach to improve the bandwidth of Microstrip patch antenna using thick substrate and by inserting U slot and H slot in the Truncated rectangular microstrip antenna. By inserting only H slot in the Truncated rectangular microstrip antenna the impedance bandwidth was 21.2% whereas after adding U slot in same design the bandwidth is increase up to 50.7% in the frequency range 1.5 GHz to 2.67 GHz. The U slot is used to tune impedance matching. The radiation pattern has acceptable response at both E and H plane. The antenna is designed at glass epoxy substrate with dielectric constant 4.4, fed by a coaxial feeding technique. Detail of the proposed antenna and the simulated results are presented.
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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 Loaded Rectangular Patch Antenna for Dual Band Operation-

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

As a point in this direction we report the optimum values of the bandwidth of the optical for a system of high mode coupling optical fibers using DPSK modulation format for the input sig[r]

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Compact circular slotted rectangular UWB antenna with WLAN and partial x 
		band rejection

Compact circular slotted rectangular UWB antenna with WLAN and partial x band rejection

Many methods are available in the literature to achieve band-notched characteristics. A small ultra- wideband (UWB) microstrip fed monopole antenna having frequency band stop function is suggested in [2]. In this a narrow slit is used to increase the impedance bandwidth of an antenna. By implanting an altered inverted U-slot on the suggested antenna, the frequency band stop properties are obtained. By employing a CCRC cell [3], A frequency notched UWB antenna using two split trapezoidal slots connected in a reverse way is realized in [4], with folded strip for ultra wideband applications is suggested in [5]. In [6] an antenna with partial ground, concave circled and convex circled radiating patch is discussed. In [7] an antenna utilized a C-shaped ground to appreciate a small size and a pair of open-loop resonators (OLRs) to create notched band. A tunable notched band antenna of 2.7–7.2 GHz by inserting a 𝝅 shaped slot on the radiating patch is
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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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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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U-slot Loaded Rectangular Patch Antenna for Dual Band Operation-

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

ABSTRACT: Industrial control systems (ICS) control almost all the vital processes and industries that have direct effects on our lives. Recent information security breaches found in these systems have led to proliferation of attacks that can endanger not only the company they were deployed in but the people and environment around it. Stuxnet worm was a ‘successful’ story. Recently, it is shown that even regular attackers without sophisticated tools, like Stuxnet, can take control of ICS and create disasters. Even though vast amount of effort has put into securing ICS, this paper aims to illustrate that based on reported and experimentally obtained vulnerabilities on all aspects of ICS, no short term solution to protect ICS exists. This makes all ICSs vulnerable to at least one or more forms of attacks especially when network access is possible. Having insecure ICS will lead to dare consequences that will affect every one of us irrespective of color, nationality and religion. Since attack scenarios to ICS and code segments of malwares such as Stuxnet can be found on Internet, attacking ICS can be orchestrated with little effort from anywhere. Unfortunately, these forms of cyber attacks cannot be traced easily. The proven governmental investments to exploit these security breaches as untraceable weapons will lead the whole world into a very dark future. Last but not least, ICS with security considerations must be reinvented from the ground up and no patch can fix the problems if they not worsen it.
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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

This antenna is highly directive antenna with large directivity. Radiation pattern of antenna at different frequencies namely 4.6 GHz, 6.7 GHz and 8.6 GHz have been shown in figure 5(a), 5(b) and 5(c). Table 5.1 shows comparison of results of different designs of making u slots cut applied on rectangular patch to form four u slot antenna as shown in figure 1, 2 and.3. When a transmitter is connected to an antenna by a feed, the impedance of the feed line and antenna must exactly match for maximum energy transfer from the feed line to the antenna. However, when the antenna and feed line do not have matched impedances, part of the electrical energy cannot be transferred from the feed line to the antenna. It is the function of reflection coefficient and tells amount of power that gets reflected. VSWR of antenna as shown in figure 3 is shown in figure 6. Results are analyzed in terms of antenna paramameters as shown in table 2.
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U Slot Microstrip Patch Antenna

U Slot Microstrip Patch Antenna

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. Index Terms—- single u-shaped slot, RT Duroid 5880 substrate, HFSS software, 3D simulator, gain, return loss.
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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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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-

Figure 6. Variation of return loss S 11 with frequency obtained from Ansoft HFSS software for different value of slot length Ls The variation of return loss S 11 according to L s is shown by Figure 5 obtained from Matlab code, it is observed that the increase of the L s , decreases both the lower and the upper resonance frequencies. In Figure 6 obtained from Ansoft HFSS software. It is found that the variation of the upper resonance frequencies is more significant than the lower resonance. For the variation of S 11 according to slot width S shown by Figure 7 (obtained from Matlab code) and Figure 8 (obtained from Ansoft HFSS softaware), it is observed that the upper gap of the resonance frequencies increase with increasing value of the slot width. It can be seen clearly that the slot width S has a stronger effect on the upper resonance frequencies than the lower resonant frequencies.
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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

The dimensions of the proposed structure is 15.8 mm × 13.1 mm × 1.57 mm. The proposed rectangular patch size is 4.24 mm × 2.45 mm. The feed point is 1.27mm from the centre of the patch. The slot thickness of proposed antenna is 0.25 mm. As the operating frequency is high,it needs to be designed with a simple structure; therefore, a microstrip coaxial feeding line is used. For this, radius of the inner coax is 0.009 mm, radius of the outer coax is 0.03 mm and coax feed length is 1.79 mm.

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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

To design a rectangular patch antenna operating at the mode that gives dual radiation beams, the patch length should be , instead of for the fundamental mode, where is the wavelength in the dielectric substrate. According to the cavity model of the patch antenna [4], the current on the patch’s surface, has two maxima at mode as shown in Fig. 1(a). Therefore, for a U- slot to work effectively, it should intercept both current maxima. Fig. 1(b) shows the current distribution on the surface of a U-slot patch antenna. It is obvious that the presence of two maxima on the patch indicates a resonator at the Mode. Meanwhile the three current nulls are observed and the Slot length is around . It should be mentioned that optimization and parametric study are needed for the U-slot parameters to acquire a wide bandwidth.
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Compact Low Profile Broadband Rectangular Patch Antenna

Compact Low Profile Broadband Rectangular Patch Antenna

ABSTRACT: In this paper, a design of compact broadband rectangular patch antenna with double U-slots for broadband operation is presented. The antenna geometry is fed with a coaxial line feeding technique using SMA connector. The feed is connected in between the two arms of U-slots. The two slots are created on patch which is placed on the thin dielectric substrate of FR4 material with dielectric constant of 4.4 and the overall dimensions of proposed antenna is 69 mm × 62 mm × 1.6 mm. The proposed antenna geometry’s performance is investigated in the frequency range of 5 GHz to 10 GHz. This geometry exhibits resonance between 7.6 GHz to 9.2 GHz. In this work we have presented broadband rectangular patch antenna with U-slot which excites single broadband operation with around 1.6 GHz (20%) bandwidth and gain greater the 5 dB. Higher bandwidth at resonant frequency was obtained as compared to the conventional patch antennas. The proposed geometry was fabricated and tested for its validation. Measured results using network analyser fairly matches with the simulated values.
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U-slot Loaded Rectangular Patch Antenna for Dual Band Operation-

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

Context-Aware Mobile TV service along the delivery chain allows the Mobile TV system to gather in a dynamic and realtime manner the different context information related to the users, de[r]

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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

patch antenna at L-band is designed. The antenna contains a U-Slot and designed with DGS technique to reduce the size of antenna. U-slot etched in the antenna allowed the fabrication on a high-dielectric-constant (10.2) substrate that achieves a reasonable axial-ratio bandwidth. Circular Polarization can be generated on a rectangular patch antenna by truncating two opposite corners of patch. In this paper a comparison has been done between a CP Microstrip antenna with and without U-Slot. At the operating frequency of 1.575 GHz with the size of the patch is 25mm X 25mm, while ground plane of 50mm X 50mm and the thickness of the substrate is 10.2 mm.. The parameters of antenna like return loss, axial ratio, RHCP and LHCP, gain are analyzed using CST MSW Software. The operating frequency is 1.521 GHz.
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A Novel Tri-band Microstrip Antenna Design with T-shaped Slots for C, X and Ku-band Applications

A Novel Tri-band Microstrip Antenna Design with T-shaped Slots for C, X and Ku-band Applications

The results shown here are simulated on HFSS software. In HFSS, rectangular patch and partial ground plane are made up of PEC (Perfect Electrical Conductor) and air or vacuum can be used for the radiation box. Figure 2 shows the variation of return loss with frequency. Return loss is the loss of power in the signal returned/reflected by the discontinuity in a transmission line which occurs due to mismatch with terminating load. The gain of the antenna has been studied using a Microstrip patch antenna fabricated on the same substrate.
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Slot Ultra Wideband (UWB) Antenna

Slot Ultra Wideband (UWB) Antenna

The main objective of this project is to design and implement slot Ultra Wideband (UWB) antenna for UWB application. The UWB antenna should be capable of operating over an ultra wide bandwidth as allocated by the FCC with bandwidth requirement from 3.1GHz to 10.6GHz and return loss below than -10dB.

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Reconfigurable patch and ground plane 
		microstrip antenna to enhancing bandwidth

Reconfigurable patch and ground plane microstrip antenna to enhancing bandwidth

The main disadvantage of this type of antenna is narrow band width, patch antennas have a very high antenna quality factor (Q). Q represents the losses associated with the antenna and a high Q results in narrow bandwidth and low efficiency. The microstrip antennas are often realized with bandwidth of the order of 1% to 5%, the bandwidth is defined more concisely as a percentage

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