Investigation on mutual coupling suppression using polygon structure of microstrip patch antenna array

Microstrip antennas or patch antennas are popular for their attractive features such as low profile, low weight, low cost, ease of fabrication and integration with RF devices. Micro strip antennas have been found favorable because they are inexpensive to manufacture and compatible with monolithic microwave integrated circuit designs (MMIC). They are usually employed at UHF and higher frequencies because the size of the antenna is directly tied to the wavelength at the resonance frequency. A Microstrip or patch antenna is a narrowband, wide-beam antenna fabricated by etching the antenna element pattern in metal trace bonded to an insulating dielectric substrate with a continuous metal layer bonded to the opposite side of the substrate which forms a ground plane. The most commonly employed microstrip antenna is a rectangular patch. The major disadvantages of Microstrip antennas are lower gain and very narrow bandwidth. Microstrip patch antennas have some drawbacks of low efficiency, narrow bandwidth (3-6%) of the central frequency. Millimeter wave technology being an emerging area is still much undeveloped. As micro strip antennas have found wide variety of application areas, a number of techniques are evolved to improve its limited bandwidth. A good approach to improve the bandwidth is increasing the thickness of substrate supporting the micro strip patch. However problems exist on the ability to effectively feed the patch on a thick substrate and the radiation efficiency can degrade with increasing substrate thickness. A substantial research needs to be done in this area as its applications are numerous. The radiation patterns and S11 performance are used for the analysis of the different configurations. In the present endeavor a rectangular patch antenna is designed on thick substrate and simulated using MATLAB software and configuration on different dielectric susbstrates was used .

The microstrip patch antennas are associated with some disadvantages, such as narrow bandwidth and low gain. To meet the demands of long distance communication, is necessary to design antennas with very high gain. The easiest way of gain enhancement can be obtained is from the array models, but the increasing array spacing, the gain of the antenna gets reduced significantly also decreasing array spacing, a strong mutual coupling is appears. This letter describes a novel configuration of mushroom-type EBGs structures 13×2 to reduce mutual coupling between the radiating elements 2×4. Our objective is to reduce both the element separation and the mutual coupling between the patch antennas. The results show that a reduction in mutual coupling from −33.24 dB to −59.36 dB is obtained between elements at the operation frequency 5.8 GHz of the antenna array. The proposed configuration is designed, optimized, and miniaturized by using electromagnetic software CST Microwave Studio.

This paper proposes a technique that is used to decrease the mutual coupling between microstrip patch antenna arrays. The proposed technique involves destructing the ground plane of microstrip patch antenna. Destructive ground structure (DGS) helps to absorb the waves which propagate through ground plane. These waves are known as surface waves. A major contribution of mutual coupling is given by these surface waves. DGS technique is one which reduces the interference of these waves with one other. This technique focuses on reduction of coupling for WIMAX applications at an operating frequency of 3.5 GHZ. This technique seems to be most effective to microstrip patch antennas. The proposed technique leads to the reduced mutual coupling to a greater extent and also results in a reduced antenna size.

A dual-band, 4×2 microstrip patch antenna (MPA) array for future 5G communication applications is proposed in this paper. The single element antenna of the proposed array configuration is a dual band patch antenna with dimension of 8×8 mm². This proposed single element antenna has resonance frequencies of 29 GHz and 40.5 GHz, and achieves 5.69 dBi and 4.54 dBi gain at the center frequencies respectively. The attained -10dB impedance bandwidth of the single element antenna is 10.34% and 12.34% at two operating frequency bands. Using corporate fed and series fed, the proposed 8-element MPA array is designed from this single element. The dimension of the proposed array antenna is 38 × 15 mm2 and low-cost FR-4 material is used as the substrate. The proposed array antenna resonates at 29.5 GHz and 38 GHz, and provides 8.4 dBi and 9.3 dBi total gain at the resonance frequencies respectively. Thus, improved bandwidth and better radiation performance over required frequency bands, high gain and use of low-cost material makes the proposed antenna perfect for 5G communication/wireless communication applications.

In this paper an innovative microstrip patch antenna is designed to enhance the return loss. This work presents the comparative analysis of the return loss enhancement between the microstrip patch antenna and circular patch antenna. Materials and methods: The return loss of proposed microstrip patch antenna was compared to circular patch antenna in High-frequency structure simulator environment. The sample size estimation is done using the G Power statistical tool with probability of 80% and the total sample size of the research is 20 and consists of two groups i.e for each group 10 samples. From the SPSS analysis the significance is obtained (0.039) which is less than 0.05. Results: The return loss is improved for -40.56 in the proposed innovative microstrip patch antenna in ka-band frequency range compared to circular patch antenna (−12.59 dB). Conclusion: Within the limits of this study, the proposed microstrip patch antenna attained higher return loss in Ka-band. The results are verified using the HFSS modeling.

This paper presents comparison of rectangular micro strip patch antenna and E-Shaped micro strip patch antenna operating at 2.45GHz. Two parallel slots are made into the basic rectangular patch design of micro strip antenna which resulted into desired E-shaped patch. The basic design consist of inset feed type and we have used dielectric substrate Fr4 epoxy whereas E-shaped patch consist of coaxial probe and RT Duroid as substrate. Both the designs have been implemented using HFSS software. On comparing the parameters of both the antenna’s design, it was observed that E-shaped patch antenna has enhanced gain and return loss, hence the antenna with enhanced parameters is considered, the better one. Keywords : Rectangular patch antenna, Micro strip patch, E-shaped patch, coaxial feed Cite this Article Priya Sharma, Shreya Ghare, Shruti Jain, Archana Tiwari. Design and Simulation of E-Shape Micro-strip Patch Antenna at 2.45GHz. Journal of Microwave Engineering & Technologies . 2020; 7(1): 17–24p.

Microstrip antennas are widely used in wireless communication, radar, satellite systems, and astronomy applications. Because of their ease of manufacturing, their lightweight, low profile and also their ability to conform to non-planar structures in free space, these structures need tools based on numerical techniques to model and solve some electromagnetic problems like interference and discontinuity. However, the 3D planar discontinuity presents several difficulties related to the volume mesh. Furthermore, the entire volume must be considered, even the smallest details. In this paper, we will develop a formulation based on the hybridization between the reciprocity theorem and the Method of the Generalized Equivalent Circuit (MGEC) to model and analyze a 3D planar discontinuity existing between the excitation source which described by a coaxial cable and a microstrip patch antenna. The values of the current density distribution on either side of the patch antenna and microstrip as well as the relative error value between microstrip patch antenna and excitation source shows the existence of discontinuity.

Abstract. The antenna cross polarization suppression (CPS) is of significant importance for the accurate calculation of polarimetric weather radar moments. State-of-the-art reflector antennas fulfill these requirements, but phased array antennas are changing their CPS during the main beam shift, off-broadside direction. Since the cross polarization (x-pol) of the array pattern is affected by the x-pol element factor, the single antenna element should be designed for maximum CPS, not only at broadside, but also for the complete angular electronic scan (e-scan) range of the phased array antenna main beam positions. Different methods for reducing the x-pol radiation from microstrip patch antenna elements, available from literature sources, are discussed and summarized. The potential x-pol sources from probe fed microstrip patch antennas are investigated. Due to the lack of literature references, circular and square shaped X-Band radiators are compared in their x-pol performance and the microstrip patch antenna size variation was analyzed for improved x-pol pattern. Furthermore, the most promising technique for the reduction of x-pol radiation, namely "differential feeding with two RF signals 180° out of phase", is compared to single fed patch antennas and thoroughly investigated for phased array applications with simulation results from CST MICROWAVE STUDIO (CST MWS). A new explanation for the excellent port isolation of dual linear polarized and differential fed patch antennas is given graphically. The antenna radiation pattern from single fed and differential fed microstrip patch antennas are analyzed and the shapes of the x-pol patterns are discussed with the well-known cavity model. Moreover, two new visual based electromagnetic approaches for the explanation of the x-pol generation will be given: the field line approach and the surface current distribution approach provide new insight in understanding the generation of x-pol component in microstrip patch antenna radiation patterns.

In this paper Microstrip Patch antenna is designed in Ansoft HFSSV13. The designed antennas are double-sided printed microstrip patch antenna. The antenna is designed over the operating frequency is 2.4GHZ using the substrate material as FR4 which has the dielectric constant of 4.4(ε <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">r</inf> ). The designed antenna can be used for ISM (industrial, scientific and medical) band and WLAN applications. The designed antenna has low profile, low cost, easy fabrication and good isolation. The antenna is designed by using Ansoft HFSSV13 simulation software and designed antenna provides return loss less then −10dB. The parameters such as return loss, voltage standing wave ratio (VSWR), mutual coupling, gain, radiation pattern has been simulated and analyzed.

In this research, we utilized Ansoft's HFSS v13, which is a Finite Element Method (FEM) based electromagnetic (EM) simulator, to design and analyze two types of patch antennas: a 1x4 circular microstrip patch antenna and a 1x4 hexagonal microstrip patch antenna, operating at 5 GHz. The circular patch antenna was fabricated on a FR4 substrate with a dielectric constant of 4.4dB and a height of 1.6mm. Various antenna characteristics, such as return loss, radiation pattern, directivity, gain, return loss and radiation efficiency, were investigated. The designed 1x4 hexagonal patch antenna and 1x4 circular patch antenna achieved a bandwidth of 3.79% with return loss values well below -30dB. Additionally, a favorable directivity value of 4.5dBi and a gain of 2.7dBi for the 1x4 circular patch antenna and a gain of 3.9dBi for the 1x4 hexagonal patch antenna were obtained. Due to their C-band architecture, these microstrip patch antennas can be employed in various satellite communication applications, such as transponders.

In this paper, we present a novel slotted structure which will be etched on the patch of new microstrip patch antenna, and ground plane with crossed strip-line gaps is also used in our novel slotted patch antenna, unlike conventional microstrip patch antenna. The simulated results show that the bandwidth of slotted antenna is 13 times wider than the original microstrip antenna. Moreover, magnetic field distribution of slotted microstrip antenna is much more uniform than that of original microstrip antenna, as a result, the slotted antenna has better radiation characteristic. In addition, the 50 Ω matching is reached at the resonant frequency, therefore additional matching networks are not needed.

This paper is presentation of designed different diodes loaded active model dissimilar geometries of micro strip patch antennas. As known, mikrostrip patch antennas have complex impedance and its impedance changes with frequency. Because of this, imaginer part of micro strip patch antennas is minimized by effect of diodes having capacitive reactance thus maximum power radiating is occurred. The aim of this project is to present different diodes loaded patch antenna for ISM 2.4 Ghz and to indicate active antenna performance according to influence of locations and dc biasing of diodes then to compare the antenna parameters of passive models. Besides, this project is used three types of diodes which are schottky Barrier diodes, silicon variable capacitance diode and tuner diode and four diodes whose are bas70, bas83, bb619 and bb721. The simulation programmer is AWR Design Environment Microwave Office 2007 (MWO) whose analysis meted is moment (Mom). Finally, the antennas that are projected are ready condition for LAN application or wireless RF receiver-transmitter systems. Return loss of designed antennas are between -25.54 dB and -36.17 dB. Gain does not change a lot but results of VSWR and Input impedance is satisfactory when comparing the passive model's results.

This paper comes with a new study on the conception of a CPW-Fed multi bands planar antenna. The design takes into account that this structure can be integrated with circuits behind, that why the Fed is a CPW one. The antenna validated is suitable for GSM, DCS and ISM band. The entire area of the antenna is 36×72.5 mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> and it is printed on an FR4 substrate. The printed U-shaped antenna is formed from two horizontal arms of different lengths and an L-shaped shorted strip which is connected between the vertical arm and the ground plane. The antenna is designed, optimized, and miniaturized by using ADS "Advanced Design System" and the results are compared with CST Microwave Studio.

The study of antennas has taken a leap in the past few decades. On the contrast to the traditional large size antennas, Microstrip patch antennas have come to the picture and have found their application in mobile phones, defense instruments, wireless wearable devices, etc. The Microstrip patch antenna have more advantages and provides better results as compared to the traditional antennas. Being lighter, foldable, easy to fabricate, multiple frequency operations, small in size, Microstrip patch antennas have replaced almost all the traditional antennas in almost all the wireless applications. The paper presents a review of different Microstrip antennas with different feeding techniques and its application over the traditional antennas.

This paper had been comparing the performance of the normal patch antenna with single complimentary SRR patch antenna. Four different shapes of single complimentary split ring resonator structure had been incorporated into the microstrip patch antenna - square, circular, triangular, and rhombic. This simulation works had been done in CST Microwave Studio simulation software. The operating frequency of this antenna is 2.40 GHz for Wireless Local Area Network (WLAN) application. The parameters that considered in these works are return loss, resonant frequency, input impedance, gain, radiation pattern and bandwidth. The focusing parameter is to achieve the best gain performance that obtained from the single complimentary split ring resonator patch antenna. The addition of square SRR onto patch antenna will improve the gain from 6.334 dB to 6.508 dB.