Top PDF Circularly-Polarized Stacked Annular-Ring Microstrip Antenna

Circularly-Polarized Stacked Annular-Ring Microstrip Antenna

Circularly-Polarized Stacked Annular-Ring Microstrip Antenna

Comparing the obtained results with previous dual-band mi- crostrip antennas with circular polarization referenced in the intro- duction part, it can be verified that our measured reflection coefficient presents a wider bandwidth than [1], and is similar to [3, 4] where feed- ing networks were also used. On the other hand, the measured gain and axial ratio as a function of frequency is very similar to the gain and axial ratio presented in [3, 4]. However, the proposed antenna has a more compact size thanks to the use of the annular-rings and the reduction of the substrate size. Finally, it must be emphasized that the dual-band antenna shown in [6] presents a compact size because it is composed of only one layer. However, it only has a good axial ratio at boresight in the interesting bands, worse 4 dB axial ratio beamwidth and lower values of gain than our.
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Parametric Studies on the Circularly Polarized Stacked Annular-Ring Microstrip Antenna

Parametric Studies on the Circularly Polarized Stacked Annular-Ring Microstrip Antenna

techniques have been proposed to solve this problem. In [3], the authors use microstrip line as impedance transformer to realize matching with the characteristic impedance of 50 Ω. In [4–8], the technique of coupling feeding is used to improve the impedance matching. Loading gaps, slits, or stubs on the ring is another method to be involved [9], but the patch mainly works at linear polarization, and polarization rotation can be caused by the loading. However, the above approaches hardly provide wide impedance bandwidth because of the single resonant frequency. Stacking parasitic patch above the annular ring can greatly reduce the value of input impedance [10, 11], and the bandwidth can be broadened obviously due to exciting two adjacent resonant frequencies. But in [10], the authors did not provide the relative parametric studies on the antenna performance, especially, the CP performance when the antenna works in circular polarization.
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Single-Feed Circularly Polarized Annular Slot Antenna for Dual-Broadband Operation

Single-Feed Circularly Polarized Annular Slot Antenna for Dual-Broadband Operation

In this paper, a novel dual-broadband circularly polarized antenna using two special slots and single microstrip-coupled feed is introduced and investigated. By optimizing the key geometrical parameters of the antenna, two wide impedance bandwidths of 35.0% (1.91–2.72 GHz) and 46.5% (4.36–7.00 GHz) are obtained, as well as two axial ratio bandwidths are 2.36–2.56 GHz and 5.68–6.04 GHz, respectively. Good agreement between the simulated and measured results is also achieved, which implies that the proposed antenna is a good candidate for dual- broadband circularly polarized wireless systems.
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Wide Beam Circularly Polarized Microstrip Antenna with Parasitic Ring for CNSS Application

Wide Beam Circularly Polarized Microstrip Antenna with Parasitic Ring for CNSS Application

In this communication, a practical method has been discussed for controlling the vertical HPBW of circularly polarized microstrip antennas. This method is based on a parasitic ring right above the microstrip antenna. A prototype antenna based on the proposed method was designed, at 2.492 GHz for CNSS application, fabricated and tested. The measurements showed it could effectively widen the vertical HPBW and improve the gain for low elevation angle. The structural parameters of the parasitic ring are key factors for determining the vertical HPBW. Besides, it could maintain good omnidirectional characteristics for the horizontal radiation pattern. This structure is simple and easy to manufacture.
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A Compact Circularly Polarized Microstrip Ring Antenna Using a Slotted Ground for GNSS Applications

A Compact Circularly Polarized Microstrip Ring Antenna Using a Slotted Ground for GNSS Applications

Abstract—A compact circularly polarized microstrip ring antenna is presented for Global Navigation Satellite systems (GNSS) application in this paper. The antenna consists of a ring-shaped slotted ground and a radiation patch which is fed by a T-like coupling feedline. The radiation patch is a square ring strip embedded within two inverted L-shaped strips and a rectangular strip. The overall size of the proposed antenna is 0.38 × 0.38 × 0.038λ 3 g (λ g is the guide wavelength at the frequency of 1575 MHz).

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Design of a Circularly Polarized Microstrip Antenna for WLAN

Design of a Circularly Polarized Microstrip Antenna for WLAN

many attractive features, microstrip patch antennas have received considerable attention for wireless communication applications [2–12]. In [2] a patch antenna was developed for HIPERLAN to operate at higher order mode and at the frequency band of 5 GHz, 6.1% bandwidth and 4.2 dB gain were achieved. The design of dual frequency shorted stacked patch antenna [3] and shorted E-shaped patch antenna [4] are also developed for the application in wireless communication. Dual frequency antennas for wireless LAN also developed [6, 7]. Current research works also include miniaturized multiband short circuited microstrip antennas [9–11] and wideband proximity coupled microstrip antennas [12–18]. Single layer microstrip antennas have very narrow bandwidth, but using multi-layered configurations like proximity coupled microstrip antennas or aperture coupled microstrip antennas, higher bandwidth can be achieved [12–18]. Design and development of compact printed antennas for wireless communications are also reported [19–28]. A thin wideband microstrip patch using two parallel slots is designed for WLAN [19]. In [20] a triple band omnidirectional antenna, consisting of three pairs of back-to-back printed dipoles, for the operation at 2.4 GHz, 5.2 GHz and 5.8 GHz bands, is described. Design of efficient patch antennas for the applications in wireless communication are reported in [21, 22]. The loop structure and two-layered meander strips are used to design small size and broadband antenna for mobile terminals [23]. Important related work also reported by various authors [24–28] where broadband miniaturized printed antennas are developed.
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A Single-Feed Dual-Band Dual-Sense Circularly Polarized Microstrip Antenna

A Single-Feed Dual-Band Dual-Sense Circularly Polarized Microstrip Antenna

Abstract—A single-feed dual-band dual-sense circularly polarized (CP) microstrip antenna is proposed. The antenna consists of a circular radiating patch with a ring slot, two substrates with an air layer sandwiched between them and a capacitive coupling feed. The two resonant frequencies are controlled by the size of the circular radiating patch and the ring slot. By introducing the perturbation, the fundamental resonant mode splits into two orthogonal degenerate modes, and the CP radiation pattern is obtained. Capacitive disk coupling feed is also used in the design to enhance the bandwidth. The key parameters of the design are investigated to show how to obtain dual-band and dual-sense CP. The proposed antenna prototype is fabricated and measured, and experimental results show that good CP radiation performances are obtained at both resonant frequencies.
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CIRCULARLY POLARIZED MICROSTRIP SHORT BACKFIRE ANTENNA WITH TWO RING CORRUGATED RIM

CIRCULARLY POLARIZED MICROSTRIP SHORT BACKFIRE ANTENNA WITH TWO RING CORRUGATED RIM

Abstract: A circularly polarized microstrip short backfire antenna (CPMSBA) with two ring corrugated rim using aperture coupling feed method is proposed in this paper. The antenna is designed to operate in KU-band. The simulation results verify the circular polarization. The CP antenna provides good and stable radiation pattern over the whole frequency range. The axial ratio bandwidth bw AR is 3.74%, gain is

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Broadband Design of Planar Circularly Polarized Annular-Ring Antenna for RFID Applications

Broadband Design of Planar Circularly Polarized Annular-Ring Antenna for RFID Applications

plane. First, to gain equal magnitude of two orthogonal resonant modes, a Wilkinson divider [9] is introduced with two output ports along x- and y-axes, respectively. However, in Fig. 1(c), the length difference of section f g and de is set up to be 46 mm, which is equal to the guided quarter-wavelength at the operating frequency of 900 MHz band to generate 90 degrees phase difference. Next, a vertical strip with the size of 8 × 17 mm 2 is used to connect the right-angle corners of dual L-shaped strip at point e and g, respectively. For a wider CP operating bandwidth at UHF band, the above annular-ring patch antenna with an air substrate is coupled-feed by dual L-shaped strips to excite TM 11 mode. The
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Dual-Band Circularly Polarized Antenna with Low Wide-Angle Axial-Ratio for Tri-Band GPS Applications

Dual-Band Circularly Polarized Antenna with Low Wide-Angle Axial-Ratio for Tri-Band GPS Applications

Multifarious microstrip antennas have been presented for GPS applications [4–7]. The proposed antenna in [4] is a dual-band circularly polarized cavity-backed annular slot antenna for GPS receiver with single-feed. Its 10 dB impedance bandwidths are 45 MHz in L 2 and 20 MHz in L 1 , while the 3 dB AR bandwidths are 11 MHz in L 2 and 9 MHz in L 1 . The bandwidth is quite too narrow. An antenna

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Single-Fed High-Gain Circularly Polarized Microstrip Antenna

Single-Fed High-Gain Circularly Polarized Microstrip Antenna

Circularly polarized (CP) microstrip antennas are widely used in radar, navigation, and satellite communication realms owing to their small size, low profile, great flexibility, and many other advantages [1]. Circular polarization is produced by using the feeding structure to excite two orthogonal linearly polarized modes with a 90 ◦ phase difference [2–13]. A single-fed circularly polarized patch antenna can be designed by slotting or chamfering on a square patch [2–4]. For these single-fed patch antennas, the measured − 10 dB return loss bandwidth and 3 dB axial ratio bandwidth are less than 5% and 2%, respectively. Circular polarization can also be obtained by a ring antenna with an asymmetrical structure [5–8]. When operated in the fundamental mode, the size of the annular ring patch antenna is smaller than that of the circular or rectangular patch for a given frequency. Reference [5] presents a circularly polarized annular-ring patch antenna achieved by a simple microstrip feed line through the coupling of a fan-shaped patch on the same plane of the antenna. The impendence bandwidth (IBW) is 2.3% (2 . 68 ∼ 2 . 74 GHz), and axial-ratio bandwidth (ARBW) is 0.6% (2 . 69 ∼ 2 . 71 GHz). In [6], a circularly polarized cut ring microstrip antenna is proposed, and the measured ARBW is 4.2%. A novel miniaturized CP implantable annular-ring antenna is proposed in [7], which has 2.49% ARBW. Reference [8] proposes a polarization-reconfigurable antenna based on ring circularly polarized microstrip antenna. The IBW is 16.7%, and the ARBW is 3.2%. Some structures, which enhance the bandwidth of single-fed circularly polarized patch microstrip antennas, are studied [9–11]. Reference [9] designs a circularly polarized antenna composed of a U-slot square patch with truncated corners supported by a substrate with dielectric constant of 10.02. A measured IBW of 15.2% (1 . 53 ∼ 1 . 78 GHz) and ARBW of 3.2% (1 . 56 ∼ 1 . 61 GHz) is achieved. A circularly polarized single-layer asymmetrical U-slot microstrip patch antenna is proposed in [10]. The asymmetrical structure of the U-slot provides two different current paths for the two orthogonal modes required for circular polarization. The measured
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An L-Probe Fed Stacked Rectangular Microstrip Antenna Combined with a Ring Antenna for Triple Band Operation in Its

An L-Probe Fed Stacked Rectangular Microstrip Antenna Combined with a Ring Antenna for Triple Band Operation in Its

ITS (Intelligent Transport System) has received much attention as a system for traffic safety and environmental protection. ITS applications such as ETC (electric toll collection system), GPS (global positioning system), SDRAS (satellite digital audio radio service) and VICS (vehicle information and communications system) have been proposed and are widely used presently. In order to use all these applications, multi band antennas represent an effective solution as car antennas for the ITS. In the ITS, a circularly polarized wave is used in the ETC, SDRAS and GPS, while a linearly polarized wave in the VICS. Therefore, car antennas have to radiate both circularly polarized waves and linearly polarized waves. In [1, 2], dual band microstrip antennas (MSAs) with two feed ports for ITS have been proposed. However, in the design for antennas with the multi feed ports, the isolations between the feed ports have to be reduced, which makes the design of the antenna difficult.
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Circularly Polarized Ultra Wide Band Ring Shaped DGS Microstrip Antenna for Wireless Applications

Circularly Polarized Ultra Wide Band Ring Shaped DGS Microstrip Antenna for Wireless Applications

Now days, Compact circularly polarized microstrip antenna antenna plays an important role in satellite communication and airborne communication due to its small size, light weight, ease of fabrication and installation [1]. Microstrip antenna has serious limitation like small bandwidth, low gain, low efficiency and small power handling capacity. Bandwidth can be enhanced by increasing the height of substrate, decreasing the dielectric constant of substrate, non contact feeding techniques, cutting different shaped slots like H Shape [2], Bowtie[3], C shape[4], L Shape etc., Corporate feeding [5], stacked arrangement of patches [6] and defected ground structure [7-8]. The polarization is an important parameter to limit the wireless communication distance due to the resulting wave having an angular variation. The circular polarization provides solution of this problem. It allows the receiver to maintain constant received power at any wave angles [9]. Linearly polarization requires polarization matching between transmitting and receiving antenna but circularly polarized antenna solves this problem. Many researchers have worked on designing of the circular polarized antenna. For generating circular polarization, two equal amplitude orthogonal feed configurations are used. The
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Stacked Ring Coupled Rectangular Microstrip Antenna with Slots

Stacked Ring Coupled Rectangular Microstrip Antenna with Slots

band using PIN diode as a switch. A PIN diode is incorporated in the slot etched on rectangular patch antenna. The frequency band selectivity is achieved by controlling the state of the switch inserted in the antenna. In [8] authors have designed a dual frequency dual polarized microstrip antenna fed along the diagonal, embedded with a square slot having three extended stubs for frequency tuning. Two additional stubs of the same dimensions are also incorporated at right angles to the base arm. By changing the dimensions of the base arm and stubs in a uniform manner the ratio of the operating frequencies can be lowered. In [9] a broadband high gain microstrip patch antenna using slot is proposed. The slot use on the patch’s surface affects the radiation characteristics of the proposed antenna. By using slot on rectangular patch with coaxial probe feed a wide bandwidth is achieved.
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Design of Broadband Microstrip Patch Antenna for GPS Application

Design of Broadband Microstrip Patch Antenna for GPS Application

A Compact and Robust circularly polarized microstrip patch antenna was designed and simulated using High Frequency Simulation Structure tool [8]. The simulated results of antenna consists return loss, VSWR and radiation patterns achieved their optimum values. The Return loss valueachieved for less than-10dB and the voltage standing wave ratio less than two. A circularly polarized patch antenna with different shapes of parasitic shorting strips for a new size reduction technique has been investigated analytically. The radiation pattern can be obtained for different shapes of shorting strip. Size reduction of ring shaped patch antenna can be achieved most efficiently by using high permittivity substrate.Simulation results good enough to satisfy our requirement to fabricate it on hardware. The proposed antenna is suitable for GPS satellite communications applications.
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A Circularly-Polarized Microstrip Antenna with Quad-Band Combination

A Circularly-Polarized Microstrip Antenna with Quad-Band Combination

Abstract—In this paper, a novel quad-band combination of circularly-polarized microstrip antenna is proposed. This antenna has multi-frequency and quad-polarization with multiple coaxial probes, which cover four bands of the BeiDou navigation system (BDS), meeting different application requirements. By using a stacked structure to achieve feed and using symmetrical slotted method to place the coaxial probes, the multi-frequency antenna is connected together through the middle co-aperture. Meanwhile, the feed position and size are constantly optimized until get the most suitable one, and the necessary perturbation is obtained. We also introduce a broadband stripline 90 ◦ bridge. Ultimately, the circularly-polarized and multi-frequency operation is achieved. Furthermore, the novel design enables easy implementation, miniaturization, wide band, which can meet the application requirements and promote the development of the BDS, which can be combined with the Internet of Things technology, applied to life and production.
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Gain Enhancement for Circularly Polarized Microstrip Patch Antenna

Gain Enhancement for Circularly Polarized Microstrip Patch Antenna

In the literature, CSSSRR has been widely used [6, 7]. The CSSSRR unit contains two coupled open loops; therefore, it has two gaps. A similar unit denoted by gapped ring pair element was studied in [8]. In [8], we have studied that gap in an open loop may block current flow in a specified direction. This property was employed to reduce cross polarization gain of a linearly polarized reflect array. In this paper, effect of gaps of the CSSRR on gain enhancement for a circularly polarized antenna is investigated.

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Circularly Polarized Slit Loaded Broadband Coplanar Capacitive Coupled Probe Fed Microstrip Antenna for Wireless Communication System

Circularly Polarized Slit Loaded Broadband Coplanar Capacitive Coupled Probe Fed Microstrip Antenna for Wireless Communication System

receiver orientation [15] than for linearly polarized antennas. Although Microstrip antennas in their basic form normally provide linear polarization, circular polarization can be obtained by certain modification to the basic antenna geometry and /or feed. These modifications includes adjusting the dimensions of basic patch with one or more feed, trimming the corners of the square patch, feeding the patch at adjacent sides, cutting the slots inside the patch, and feeding the patch(rectangular) from its corners along the diagonals[16].Several CP antennas available in this literature. In conventional single feed circularly polarized Microstrip antenna design, a substrate with high permittivity s often used to make the antenna compact[17] but it has an inherent drawback of low axial ratio bandwidth. The antenna reported in [18] has axial ratio (<3dB) of just 0.65%.To enhance the axial ratio bandwidth, a thicker substrate is normally used. But the axial ratio band and impedance matching band does not overlap when the substrate thickness is increased [19]. The antenna reported by [19] has axial ratio bandwidth of 6.3% with straight feed and increases up to 14.1% with L-strip feed which is a corner trimmed CP antenna with U-shaped slot cut on the patch to insure wide impedance bandwidth. The antenna reported in [20] and [21] are having axial ratio bandwidth of 14% and 23% respectively.Since these antennas consist of stacked configurations and hence they are very difficult to fabricate. The probe feed H –shape Microstrip antenna fed along with its diagonal to get circular polarization[22] have axial ratio bandwidth of just 1.3%.
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Review of Circularly Polarized Microstrip Antennas for RFID Application

Review of Circularly Polarized Microstrip Antennas for RFID Application

This paper consists of different types of techniques and geometries which are designed and used by different authors to increase bandwidth, achieve good quality circularly polarized radiations. One of the techniques is single feed, stacked, slotted circularly polarized microstrip antenna in which circular polarization is achieved with using two circular slots [3], A wideband circularly polarized antenna using three stacked patches and fed by a hybrid coupler [4] was designed for UHF RFID applications. Recently, asymmetric-slotted microstrip square patches were also designed for size reduction of circularly polarized microstrip antennas. But, demerits of these antennas have a narrow circularly polarized radiation bandwidth and low gain, and are designed for hand held or portable RFID readers [5]. A wideband circularly polarized RFID antenna with high gain for a fixed reader has a longer reading range compared to a narrowband small circularly polarized antenna (low gain) used in a handheld or portable reader. A stacked ring over the radiating patch [6] is also used to improve the circularly polarized antenna‟s performance. A wideband circularly polarized stacked antenna is also designed using the main patch fed by four probes, which are sequentially connected to the suspended microstrip feed line [7].
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Driver laptop sony vaio core i3 Get file - Driver laptop sony vaio core i3

Driver laptop sony vaio core i3 Get file - Driver laptop sony vaio core i3

WINDOWS System32 msprivs. 59, and make your op-com work with 2014 op-com software Modified Dual-Band Stacked Circularly Polarized Microstrip Antenna Your current drivers license. Mortgages self-employed 8211 39,663 to 217,817 company employed 8211 32,853 to 85,721 wants to update the firmware of his Nokia Phone.

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