Bandwidth Of Microstrip Antenna Research Articles

Pencapaian Lebar-Pita Antena Mikrostrip dengan Tingkap Tergandeng untuk Frekuensi 2,4 GHz

Aperture coupled technique is designed to increase microstrip antenna bandwidth. This paper discusses bandwidth enhancement of the aperture coupled rectangular patch microstrip antenna for working on 2.4 GHz. The optimal design is determined by using the AWR simulator. The fabricated antenna is then analyzed using a vector network analyzer (Anritsu MS2034B). The results show that the antenna is able to achieve 110 MHz bandwidth with return loss is less than –9.54 dB. The bandwidth increment is approximately 77.13% higher than the directly fed antenna.

Electromagnetic band gap structures based on ultra wideband microstrip antenna

Electromagnetic band gap structures based on ultra wideband microstrip antenna

Electromagnetic Wave Radiation Reduction Using Ultra Wideband Microstrip Antenna with Single and Switch Polarity

Electromagnetic Wave Radiation Reduction Using Ultra Wideband Microstrip Antenna with Single and Switch Polarity

Design of a compact wide band microstrip antenna with very low VSWR for WiMAX applications

A single-layer coaxial-fed compact rectangular microstrip antenna with very low voltage standing wave ratio (VSWR) is presented in this paper. The simulated VSWR of the proposed antenna 1.00374 is obtained near the center frequency of the operating band (3.5 GHz). Simulation and measurement results indicate that the bandwidth (simulated: 3.36–3.715 GHz, and measured: 3.295–3.645 GHz) of the antenna exceeds 10% below VSWR 2, when the size reduction of the antenna is about 81.6%. The realized peak gain is obtained about 2.15 dBi at 3.5 GHz. For the verification of the computational results, two designs were fabricated and measured. Good agreements between simulated and measured results were found.

Extremely wideband printed monopole antenna with dual rejection bands

ABSTRACTAn extremely wideband (EWB) microstrip antenna is presented that is designed with band rejection characteristics at C and WLAN bands. This is achieved by embedding inside the inverted triangular shaped patch a pair of L‐shaped slits that have been rotated by ±90° so that they are horizontal and downward facing, and topping the patch with an arrow‐shaped strip. The feedline to the patch also needs to be backed with a trapezoid shaped ground‐plane. The center frequency of the notched bands can be easily controlled by altering the parameters of the slits and arrow‐shaped strip. The low‐profile antenna essentially radiates omni‐directionally and has a measured impedance bandwidth of 18.9 GHz (2.9–21.8 GHz) with a VSWR ≤ 2, except at the two rejection bands. The antenna has an average gain > 3 dBi. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:908–911, 2016

Design of U‐shaped antenna using different substrate with enhanced bandwidth for WLAN/WiMAX applications

ABSTRACTA compact single layer coaxially fed wideband microstrip antenna is presented in this letter. The proposed antenna consists of a U‐shaped patch and a rectangular ground plane embedded with two open ended rectangular ground slots (RGS). The antenna is designed for wide band of communication (3.02–6.03 GHZ). It is found that the maximum bandwidth of the antenna is obtained about 66.5% when a rectangular slot is inserted near the lower edge of the U‐shaped patch. The antenna was studied experimentally for impedance bandwidth, and gain. It is shown that the antenna can cover the bands of several applications including IEEE 802.11n (and the older 802.11a) WLANs application (allocate channels between 5.15 and 5.825 GHz) and WiMAX (3.2–3.8 GHz) application. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:959–963, 2016

Wideband Dual-Polarization Patch Antenna Array With Parallel Strip Line Balun Feeding

A wideband dual-polarization patch antenna array is proposed in this letter. The array is fed by a parallel strip line balun, which is adopted to generate 180° phase shift in a wide frequency range. In addition, this balun has simple structure, very small phase shift error, and good ports isolation. The working band of the antenna array is from 1.88 to 2.9 GHz with a relative bandwidth of 41.7%. The height of the antenna array is only $0.144\lambda $ , and the cross polarization is below $- \hbox{20 dB}$ . Two feeding ports are presented, which correspond to two orthogonal linear polarization. The isolation between the ports is higher than 30 dB. The simulation and measurement turns out to be similar. This antenna array can be used in TD-LTE base stations, and the design methods are also useful to other wideband microstrip antennas.

A Defected Structure Shaped CPW-Fed Wideband Microstrip Antenna for Wireless Applications

A coplanar waveguide- (CPW-) fed compact wideband defected structure shaped microstrip antenna is proposed for wireless applications. Defected structure is produced by cutting theUshape antenna in the form of two-sided T shape. The proposed antenna consists of two-sidedTshape strip as compared to usual monopole patch antenna for minimizing the height of the antenna. The large space around the radiator is fully utilized as the ground is on the same plane as of radiator. Microstrip line feed is used to excite the proposed antenna placed on an FR4 substrate (dielectric constantεr=4.4). The antenna is practically fabricated and simulated. Simulated results of the proposed antenna have been obtained by using Ansoft High-Frequency Structure Simulator (HFSS) software. These results are compared with measured results by using network analyzer. Measured result shows good agreement with the simulated results. It is observed that the proposed antenna shows a wideband from 2.96 GHz to 7.95 GHz with three bands atf1=3.23 GHz,f2=4.93 GHz, andf3=7.04 GHz.

A Defected Structure Shaped CPW-Fed Wideband Microstrip Antenna for Wireless Applications

A coplanar waveguide (CPW) fed compact wideband defected structure shaped micro-strip antenna is proposed for wireless applications. Defected structure is produced by cutting the shape antenna in the form of two-sided T shape. The proposed antenna consists of two-sided shape strip as compared to usual monopole patch antenna for minimizing the height of the antenna. The large space around the radiator is fully utilized as the ground is on the same plane as of radiator. Micro-strip line feed is used to excite the proposed antenna placed on an FR4 substrate (dielectric constant). The antenna is practically fabricated and simulated. Simulated results of the proposed antenna have been obtained by using High-Frequency Structure Simulator (HFSS) software. These results are compared with measured results by using network analyzer. Measured result shows good agreement with the simulated results. It is observed that the proposed antenna shows a wideband from 2.96 GHz to 7.95 GHz with three bands.

Substrate fields modulation with defected ground structure: A key to realize high gain, wideband microstrip antenna with improved polarization purity in principal and diagonal planes

Rectangular microstrip patch antenna with circular headed dumbbell shaped defect in ground plane has been studied experimentally for concurrent improvement in its gain, bandwidth and polarization purity in principal and 45° diagonal planes. Around 9–9.5 dBi peak co polarized (CP) gain, 22% impedance bandwidth along with minimum 19–20 dB of CP-cross polarized (XP) isolation in both principal and 45° diagonal plane are achieved with the present structure. These observed improvements in results from present antenna are justified with physical insight. The present structure is simple and easy to manufacture. The geometry of the defect in ground plane has been shaped judiciously to modulate the fields beneath the patch efficiently for simultaneous improvement of the three parameters. Very close mutual agreement between simulation and measure results are revealed. The present investigation provides an insightful, visualization-based understanding of concurrent improvement of all these parameters. © 2015 Wiley Periodicals, Inc. Int J RF and Microwave CAE 26:174–181, 2016.

Wideband microstrip antenna loaded by elliptical rings

The paper presents elliptical ring-loaded microstrip antennas for wideband applications. The parasitic stack elliptical rings bring in new resonances to enhance antenna bandwidth while maintaining the characteristics of compact size, low profile, and reasonable good polarization of microstrip antenna. By utilizing one or two elliptical rings upon a reference microstrip antenna (RMA) as parasitic, more resonances appeared as the rings operated as half-wavelength resonators. Thus, two and three resonances are observed for the one ring-loaded microstrip antenna (ORLMA) and dual ring-loaded microstrip antenna (DRLMA), respectively. The antennas maintain compact size and low-profile characteristics, and the volumes of RMA, ORLMA, and DRLMA compared to their corresponding low edge free space wavelength are 0.345 λ × 0.285 λ × 0.020 λ, 0.330 λ × 0.273 λ × 0.038 λ, and 0.392 λ × 0.287 λ × 0.037 λ, respectively, while their measured bandwidth increased from 2.8 to 6.3 and 7.0%. Reasonable good polarization and radiation patterns are also obtained for the antennas.

A Compact Wide Band Microstrip Antenna with Slotted Structure

A Compact Wide Band Microstrip Antenna with Slotted Structure

Semi Spiral G-shaped dual wideband Microstrip Antenna with Aperture feeding for WLAN/WiMAX/U-NII band applications

In this paper, a dual wideband microstrip antenna (MSA) has been presented for wireless local area networks (WLAN), worldwide interoperability for microwave access (Wi MaX) and U-NII band applications. The antenna is designed and simulated using CSTMWS V'10. The main goal of this paper is to get multi-frequency behavior by cutting resonant slots into the patch of the antenna and a wideband antenna behavior using an aperture coupled feeding method. The designed antenna has a semi-spiral G-shaped compact structure and an electromagnetically coupled feeding mechanism (aperture-coupled feeding). It is fabricated on an FR4 substrate with a dielectric constant of 4.4 and a dielectric loss tangent of 0.009. The testing of prototype antenna (to measure S11) is done using a vector network analyzer. The measured results are 80% matching to the simulated ones. The parametric study, simulation results, measured results, and applications of the MSA for WLAN, WiMAX, and the FCC unlicensed 5.2 GHz National Information Infrastructure (U-NII) bands are presented in the paper. The antenna shows a simulated gain of about 4.5 dB at the three wireless application bands.

Design and Analysis of a Wideband Microstrip Antenna for High Speed WLAN

Allocation of frequency spectrum for Wireless LAN is different in different countries. This presents a myriad of exciting opportunities and challenges for design in the communications arena, including antenna design. The high speed WLAN has many standards and most antennas available do not cover all the standards. The primary goal of this work is to design antenna with smallest possible size and better polarization that covers all the high speed WLAN standards ranging from 4.90 GHz to 5.82 GHz. General Terms Antenna design, WLAN, Microstrip.

Broadband Double Psi (è) Shaped PatchAntennas for Wireless Communications

This paper presents the increase in bandwidth of a microstrip antenna using a simple slotted structure in microstrip antenna. The main aim of proposed work is to obtain a large bandwidth antenna with reduced size. A new double Ψ -shaped microstrip antenna is presented, which increased the bandwidth of the E-shaped microstrip antenna by cutting an additional pair of two slots on the other radiating edge of the E-shaped patch. The double Ψ -shaped patch yielded 135 MHz bandwidth at a centre frequency of 2.4 GHz with 4.0db gain. The proposed antenna is designed and simulated on the HFSS software.

New low-cost broadband CPW-fed planar antenna

The narrow bandwidth of microstrip antennas is one of the most important features that restrict its wide usage. This paper presents a new coplanar waveguide-fed compact rectangular microstrip antenna with the improvement of the bandwidth using the slot geometry and cutting rectangular periodic edges for the patch radiator. To develop this structure, we have conducted many optimization and investigation using Momentum Software integrated into ADS “Advanced Design System” and comparison of the results with CST Microwave Studio. The comparison between the simulation and measurement results permits to validate the final achieved antenna with an improvement of the bandwidth. This antenna has wide matching input impedance ranging from 1.7 to 3.5 GHz with a return loss less than −10 dB, corresponding to bandwidth 69.7% at 2.6 GHz as a frequency center. The antenna achieved is a low cost, planar, and easy to be fabricated, thus promising for multiple applications in wireless communication systems. Details of the proposed antenna design and both simulated and experimental results are described and discussed.

Slot Cut Ultra Wide Band Antennas

The ultra wide band antennas are required in applications where larger bandwidth for the transmitting signal is needed. They cover wide bandwidth in the range from 500 MHz to the frequencies above 8000 MHz. In this paper, a review of various techniques to realize ultra wide band microstrip antennas (MSA) is presented. They are realized by using different techniques like basic planar monopole antenna and the variations of the same by using different shapes of radiating monopole antenna, like, bi-conical, Bowtie, etc. They are also realized by using modifying the feeding strip shape or by cutting the slot inside the patch. The ultra wide band (UWB) response has also been realized by using fractal shapes in the radiating monopole antenna. Towards the end of paper, the scope of future work is proposed, wherein the exact formulation of resonant length is needed for planar monopole antenna at its fundamental and higher order modes as well as the explanation for the ultra wide band response in terms of operating modes in slot cut and fractal geometries.

Complementary Split Ring Resonator Based Compact Wideband Microstrip Antenna with Tunable Bands

In this paper, the design of compact, wideband and tunable antenna is presented. The proposed antenna is consisting of a U-slot, stacked, shorted rectangular patch and complementary split ring resonator on ground plane. The antenna utilizes the shorted wall, stacked structure and complementary split ring resonator for size reduction and wideband characteristics. The antenna tuning is realized by using PIN diode. By making PIN diode ON and OFF, antenna may be configured to wideband or dual band mode. Both the simulated and experimental results are presented. The proposed antenna provides a good radiation pattern and a relatively constant gain over entire band of frequency. The proposed antenna achieves a 15.38 % size reduction with wideband characteristics.

Low-Cost Wideband Microstrip Antenna Array for 60-GHz Applications

A low-cost single-layer wideband microstrip antenna array is presented for 60-GHz band applications. Each microstrip radiation element is fed by a modified L-shaped probe to enhance the impedance bandwidth. The proposed microstrip antenna array is excited by a novel coplanar waveguide (CPW) feed network, which not only has a simple structure by abandoning the traditional air bridges (wire bonds) above the CPW T-junctions but also provides pairs of broadband differential outputs. Experimentally, two 4 $\,\times\,$ 4 antenna arrays with different polarizations were designed and fabricated on the double-sided single-layer printed circuit board. The linearly polarized array exhibits an impedance bandwidth ( ${\hbox{SWR}}\leq 2$ ) of 25.5% and a gain of around 15.2 dBi. The circularly polarized array, employing the same CPW feed network to excite sequentially rotated circularly polarized elements, achieves an impedance bandwidth ( ${\hbox{SWR}}\leq 2$ ) of 17.8%, a 3-dB axial ratio bandwidth of 15.6%, and a gain of around 14.5 dBi.

Design of L-plate proximity fed base station antenna element

Wideband microstrip antenna with L-plate capacitively coupled feed structure is designed. The antenna operates in GSM 1800/1900 (1710–1910 MHz) and UMTS I (1920–2170 MHz) frequency bands. The antenna has dual slant (±45°) polarization with high isolation (>25 dB) between the ports. Measurements of the antenna reveal good performance in terms of impedance match, gain, gain flatness, isolation, half-power beamwidth, cross-polarization level, and front-to-back ratio. The proposed antenna can be used in base station antenna arrays, pico-cell, and femto-cell small-area cellular networks.