This can be attributed to two factors: the resonant style of antenna (which makes the antenna radiate efficiently only over a narrow band of frequencies) and the thin thickness of antenna, typically less than 0. Enter values for W and L for a microstrip line to determine its Zo and Electrical Length. This calculator can. The microstrip patch is designed so its pattern maximum is normal to. A simple tool to calculate parameters for an edge fed/inset fed/probe fed patch antenna or microstrip antenna. 6GHz. In this work, we have designed a Coplanar waveguide microstrip patch antenna with linear, upper and bottom and side slots for application in DSRC. 85mm×6. Helical or Helix Antennas transmit a circular polarized wave. Formula for Differential Microstrip Impedance Calculator (Using Zo) Where, Z d = Differential Impedance. Figure 1a shows configuration of microstrip antenna with S coupled metamaterial superstrate. 8 × 107 S⁄m) with a thickness of 7 µm is used to make the ground and antenna patch. With package sizes from 15. 2,578. Universal 3G/4G/Wi-Fi MIMO feed for. Two points in space, specified as a 2-by-3 matrix corresponding to two three-element vectors of Cartesian. 0 ()1 tan 27. Feed methodsSlot coupled microstrip patch antenna, shown in Figure 1. 57 mm thickness. In some cases, users require a custom impedance value. It also has a wide angle of beam in its radiation pattern. When a Teflon dielectric substrate is used, the resonant frequency is 12. Ali H. These equations are relatively simple compared to other transmission line geometries, comprising only 2 interrelated equations for the microstrip impedance. 1 GHz and hence it can be used for advance wireless communication applications. 2 MHz (5. Share This. 8. 4 for FR4 . 4. It is an Excel Calculator for a Microstrip Rectangular Patch Antenna. Sorted by: 1. The patch is of length L, width W, and sitting on top of a substrate (some dielectric circuit board) of thickness h with permittivity . The main purpose of the antenna is the usage for on-body biomedical applications. We offer frequencies 1575. Calculation Dielectric Height: Operation Frequency: Result: Microstrip Patch Antennas (or simply patch antenna) are increasingly useful because the antenna is printed directly onto a circuit board. Microstrip Patch Antenna Calculator determines the length and width (in millimeters) of a rectangular patch antenna. 1245,1251, Sep 1998. 6mm×5. Find: (a) The input impedance. The substrate is backed underneath by a ground plane constructed from a 2D rectangular sheet, which. For example, if you wish to input "25000000", just type "25M" instead. It consists of rectangular substrate and the metal trace layer as shown in Fig. Data safety. 09/08/2007: Online VSWR calculator added. 6 mm 3 which is highly compact sized antenna. 微带贴片天线 (或简称贴片天线). The Patch Antenna online calculator, which is based on simplified formulas for calculating microstrip transmission lines and is intended for preliminary calcula The microstrip patch antenna calculator determines the length (L) and width (W) of a rectangular microstrip patch antenna for a given resonant frequency or vice versa. This calculator is essential for engineers,. In the RF domain the antenna size also has reduced and thus the system has become more portable. Microstrip Patch Antennas (or simply patch antenna) are increasingly useful because the antenna is printed directly onto a circuit board. Here's a tip on an easy way to calculate the radius of a circular patch antenna from a rectangle patch antenna, from Dan: Lately I've been working on a dual band dual polarized AESA for a mobile weather radar for those guys who like to chase tornadoes. 946 for silver, or 1. 3. A compact ultra-wideband patch antenna is presented in this paper. com This tool calculates the dimensions of the microstrip patch antenna given the operating frequency and the dielectric constant of the material used, or the velocity of propagation of the signal. They are suitable for vehicle based satellite link antennas, global positioning systems, radar for missiles and mobile handheld radios. The microstrip patch antennas as radiating device have advantages like, low profile, conformal and low-cost. The C. From the edge of the patch add a quarter of a wavelength from the lowest frequency. Microstrip Patch Antenna Calculator - This calculator calculates the length and width of a patch antenna based on the frequency, dielectric constant of the dielectric and the height of the thickness of the patch antenna substrate. This rectangular microstrip patch antenna is designed for wireless communication application that works at 2. Calculation Dielectric Height: Operation Frequency: Result: Microstrip Patch Antennas (or simply patch antenna) are increasingly useful because the antenna is printed directly. hi balanis antena theory book thay have give example problem. Therefore, it has the advantage of low-cost manufacturing and a wide range of radiation patterns. Despite their limited bandwidth, the mm-wave microstrip patch antenna could be a promising choice to satisfy all the above needs in 5G [2,6]. For our microstrip patch antenna a = (W/2 + 2h) where 2h is the approximated width extension due to the fringing field , and η = 94%. Whether you are a beginner or expert, this calculator can help you m achine your antenna design for optimal performance. The total dimension of the antenna is 13 × 12 × 1. Suntsu Patch Antennas offer GPS and GLONASS communications serving the Smart grid, IOT, Enterprise, Automotive, Telecommunications, and Consumer Wireless Industries. The width of theSIMULATION RESULTS. Instead of using larger antenna, Microstrip Patch Antenna (MPA) is now the first choice of any system designer. This antenna patch calculator can simplify the calculation of antenna dimensions for rectangular, circular and triangular shapes. Design of an antenna. 83 dB at resonant frequency of 300. Electromagnetic band gap (EBG) structure is. Microstrip patch antennas is one of the most used antennas for wireless communication. The dimensions of this. The microstrip antenna is a convenient, planar, easy-to-fabricate antenna with some attractive attributes and features, as well as some distinct limitations. This is a tool I developed to assist us at the Cambridge University Spaceflight Club to design a patch antenna for telemetry. A bandwidth of 14% for VSWR less than 1. The ANSI-based circular microstrip patch antenna is designed to work at 7. 0) eff. The substrate’s Dielectric constant is 5. 3, h = 1. You can perform full-wave EM solver based analysis on the regular patchMicrostripInsetfed antenna or you can create a patchMicrostripInsetfed type AIAntenna and explore the. The patch antenna has two radiating slots of length W p. What is the optimized gap size of an inset-fed Rectangular Microstrip Patch Antenna? Question. This can be set to zero, but the calculated loss will not include conductor losses. The fields in this region can be modeled as a transmission line section or a cavity giving rise to the designations transmission line model and cavity model. Effective dielectric constant of patch antenna is given as (6) The width of the patch antenna is given as (7) Length and Width of slot is given as (8) Figure 1. 04/03/2007: Microstrip Patch Antenna: From Simulation to Realization added in the TutorialsTools section. The physical length of an antenna is the actual physical dimensions of the antenna. The microstrip. The design theory of antenna is studied by various researchers and different types of geometry models are invented with respect to their knowledge and applications [2] [3] [4]. , the antenna feeding point [38]), and TL dimensions optimized to 50 Ω impedance matching. The first layer is about. Microstrip is a single trace on the top layer, with no ground close to it on the same layer. Copper (σ = 5. Figures 14. They develped a 1x2 microstrip patch antenna array based on photonic crystals. With the help of this tool, you can estimate the length, width, frequency, and bandwidth of your patch antenna. Description. Click here to go to our main page on microstrip patch antennas. Below is the standard input impedance of an inset fed patch antenna at 2. In its simplest form, it uses a conducting “patch” one-half wavelength long, so that the metal surface acts as a resonator similarly to the half-wave dipole antennas. It usually consists of a metal “patch” on top of a grounded dielectric substrate. 85 × 57. On GaAs (ε R =12. 575mm is used in the simulation process. For example: F=10. 827db and bandwidth of 308 MHz at the operating frequency, The VSWR obtained is 1. Note that a quarter-wave length transformer was used to match the patch to a 50 Ohm feed line. 76 Microstrip Antenna Design Handbook patch periphery onto the ground plane. Tech Consultant Zach Peterson explores how to make patch antenna connections through the PCB substrate in order to avoid having traces on the same side of th. Many modal waves are excited. Coupling of the slot to the dominant mode of the patch and the microstrip line occurs because the slot interrupts the longitudinal current flow in them. The antenna is designed using 1. 5 mils (241 microns). The following image shows a micro-strip or patch antenna. The basic outline of the antenna is depicted in Figure 1, where W is the width, and L is the length (relative to the feed point) [7]. Ver licencia. microstrip fabrication technique is used to make patch antennas. The most common version of printed antenna is microstrip antenna, which consists of a metallic patch above a ground plane. In present communication the square microstrip patch antenna is designed and analyzed for parameters like return loss, VSWR, smith chart, and radiation pattern by using Ansoft Designer SV2. The circular microstrip patch antenna has a deep utilization to microstrip antennas, especially in the pharmaceutical, militant, mobile, and planetoid transmissions fields. […] The Microstrip Patch Antenna Calculator is a powerful tool that enables engineers, students, and researchers to calculate the dimensions of a microstrip patch antenna quickly and accurately. Dimensions of patch are computed using the designed. Printed antennae. The microstrip antennas can be excited either by coaxialThe patch antenna calculator linkMicrostrip line calculator linksubstrate used: Er. 5 GHz. Hi, In this video you can learn about how to design Micropatch or a Microstrip antenna using MATLABDownload Example Code Here: Cotta. In this study the antenna was fed with a microstrip line. “Rectangular Microstrip Patch Antenna Using Air as Substrate for S-Band Communication. “468” is the constant used to convert frequency in MHz to feet. The designed antenna has inset feed over microstrip line feeding geometry. Matlab/Freemat file 1. The microstrip calculator determines the width and length of a microstrip line for a given characteristic impedance (Zo) and electrical length or vice versa. 03 and 8. λ 20 - wavelength for 20 ohm microstrip line (wavelength in wide patch seems to be similar to wide low-impedance microstrip line) Then use L for both patch width and patch height. Pick out a standard part number from the data. e 3. 48. “Rectangular Microstrip Patch Antenna Using Air as Substrate for S-Band Communication. 03/10/2007: Online microstrip patch antenna calculator added in the Tutorials\Tools section. The exterior region is the rest of the space. A circuit model is introduced to find the. This can. patch microstrip antennas," Antennas and Propagation, IEEE Transactions on, vol. The resonant frequency of an LC Circuit is the frequency at which the inductive reactance and capacitive reactance of the LC circuit are equal. Another way to excite the patch is by using an inset-feed. The dorminant TM 10 mode which the patch antenna radiates upward from the ground plane is excited byFigure 3. To analyse the bandwidth of microstrip patch antenna using novel microstrip line fed with coaxial probe fed on 50 Ohm characteristics impedance at 10. Its key features include a limited bandwidth, low cost, and ease of manufacture. 3. [6] Putranto, Prasetyo, Mashury Wahab, Topik Teguh Estu, and A Flowchart. Rho: Conductor resistivity relative to copper. Hawkeye tag adopts inset-fed rectangular microstrip patch antenna with the patch, edge notch depth (i. 2. a) Dielectric loss (in dB per unit length, length is in the units used for λ. Cite. 05λ0It's time for a Microwaves101 Rule of Thumb! For pure alumina (ε R =9. is dielectric constant of the substrate kept at 4. Microstrip Patch Antenna Calculator Calculate dimensions and edge impedance for desired resonant frequency. In this paper, a novel microstrip patch antenna array based on a silicon-air photonic crystal substrate is designed and analyzed in the frequency range of 0. C. The radiating elements and the feed linesImpedance Matching Techniques for Microstrip Patch Antenna Sonia Sharma1*, C. Microstrip patch antennas gains an advantage over other microwave antennas in the area of portability as these antennas. Wilson, Graduate Student Radar and Communications Lab Department of Electrical Engineering Penn State University, State College, PA. Introduction: The Microstrip Patch Antenna Calculator is an online tool that calculates the dimensions of a microstrip patch antenna. 25 shows the schematic design of a rectangular microstrip patch antenna. Parametric analysis and design of 28GHz microstrip patch antenna. 4:Inset fed microstrip antenna. Figure 1. In the circular case, instead of the operating frequencies being related to. This effect can be done by changing the path of current. In fact, striplines often make components such as band-pass filter's more accurately, with more symmetric roll-off and no lower cutoff frequency. The proposed antenna is obtained through optimizing the structural parameters of CSRR. Narbudowicz Technological University Dublin Follow this and additional works at: Part of the Electrical and Electronics Commons Recommended Citation Narbudowicz, A. Decreasing τ will. After developing a basis of understanding in antenna theory and the. For this purpose, in this. There are a number of pcb transmission line typologies. Consider a dipole antenna from the Antenna Toolbox™ with an operating frequency of 75 MHz and corresponding wavelength of 4 m. Pick out a standard part number from the data sheets listed below. The dipole object creates a half-wavelength dipole antenna, hence its electrical length is Lambda/2 or 2 m,. As a result, the length and width of the Patch antenna can be calculated by either Online Microstrip Patch Antenna Calculator or experimental formulas [1]. Antennas Propagation ,7 pages. 036Dedicated short-range communications (DSRC) is an important wireless technology for current and future automotive safety and mitigation of traffic jams. More than 100 million people. Then, a metal strip in the form of a sign (+) is added within the four segments connecting the antenna feeding line to this strip []. In [6], a new parasitic resonator-based diamond-shaped mi-substrate. For the best radiation characteristics, the proposed. 285 mm × 7. **Note: All of our calculators allow SI prefix input. com 2Department of CSE, University Institute of. path. 3. It is simulated using by HFSS simulator. 0mm to 25. A microwave brain imaging system model is envisaged to detect and visualize tumor inside the human brain. 05 GHz) with the average gain of 6 dBi. The proposed model also assesses the. Improving the gain performance of air substrate patch antenna array using the effect of conductive material thickness study for 5G applications. Assume patch antenna is operating in TM_10, then at centre of patch the impedance of the patch antenna is zero and at the edge of the patch the impedance is maximum ( near about 200 ohm practically). Taohua Chen, Yueyun Chen, Rongling Jian, 2019, A wideband differential-fed microstrip patch antenna based on radiation of three resonant modes, Hindawi Int. Thanks. These are considered to be standardized impedance values with cables readily available. The length L of the rectangular patch for the fundamental excitation mode is slightly less than λ/2. Description. Microstrip Line Calculator Analyze or synthesize a microstrip line based on substrate parameters and frequency. 2. 2. A simple microstrip patch antenna with aperture coupler technique has been succesfully designed according to design specifications, simulated and analyzed. 02. Thesis. 9. xcy_antenna said: Hi, Kocha,Both a single patch antenna and patch antenna array were fabricated using the milling machine in Cal Poly’s chamber lab. Abstract. 1 are symmetric and their radiation is easy to model. The substrate parameters (ε r and h) are required. Activity points. For starter you can use standards like FR-4 substrate material with epsilon_r = 4. 45GHz. The antenna factor describes the connection between the electric field intensity E around the antenna and the antenna's voltage output V. You can use this online calculator to find the approximate values. This means that on each side of the feed line there should be a distance of 1/2 the microstrip width on each side of the microstrip between the microstrip feed line and the patch antenna. The Square patch feed by 50 coaxial probe is positioned 1. 1 Microstrip Line Feed 2. The aim of this work is to design an efficient and economical patch antenna for indoor and outdoor uses. . 20 Apr 2021. Activity points. If the ratio (L/W) is close to unity, the radiation pattern will be symmetric but may not provide a resonable input impedance. The square microstrip antenna is designed on dielectric material FR-4 (lossy) and height from ground plane is sh = 0. The frequently used ones are microstrip line, coaxial probe and aperture coupling [2]. Figure 2. 45 - empirical coefficient mainly for open end effect. Commonly fabricated with printed circuit board (PCB) technology, a microstrip antenna calculator tool is an electrical transmission line that is. A dual-band microstrip patch antenna (MPA) based on a polarization conversion metasurface structure was designed. 64×14. Properties of a Basic Microstrip Patch A microstrip or patch antenna is a low profile antenna that has a number of advantages over other antennas it is lightweight, inexpensive, and easy to integrate with accompanying electronics. Long, "The dependence of the input impedance on feed position of probe and microstrip line-fed patch antennas," IEEE Transactions on in Antennas and Propagation. 56mm. The antenna characteristics such as return loss (S11), VSWR, gain, directivity, and bandwidth and radiation pattern for each of the mentioned microstrip patch shapes are evaluated experimentally and with the use of. Note that a quarter-wave length transformer was used to match the patch to a 50 Ohm feed line. - Inductive Reactance and Admittance Calculator - Microstrip Patch Antenna Calculator - Wavelength Calculator - RF Power Density and many more. The characteristic impedance of a transmission line therefore depends on the source impedance as well as the number of patch antennas as shown in figure 2. The length of a half-wavelength dipole can be calculated by the given formula: L =. Tools. An individual microstrip antenna consists of a patch of metal foil of various. To determine the width (W), the microstrip patch antenna calculator was used to provide an initial starting point. where we apply the input to the microstrip patch antenna. An individual microstrip antenna consists of a patch of metal foil of various shapes (a patch antenna) on the surface of a PCB, with a metal foil ground plane on the other side. Based on the traditional genetic algorithm, the study explores different array topologies consisting of the same microstrip patches to optimize the design. Most RF Coaxial Cables have an impedance of 50 ohms or 75 ohms. Microwave antennas and couplers, as well as some filters, can be created using the microstrip. 6: 38–41. Low power handling. An analysis problem refers to. Any book for microstrip antennas should have the formulas you need to find the location of the feed point, to obtain precisely 50Ohm input impedance. Name is the property name and Value is the corresponding value. Hi, as I know feeding a rectangular patch antenna directly at the edge is not a good idea,. **Note: Like our stripline impedance calculator, all of our RF calculators allow SI prefix input. 6: 38–41. Light weight. This paper proposes a method for designing a 77 GHz series-fed patch array antenna. In 13, a three-band frequency reconfigurable antenna has been proposed for a. Calculator 1: This calculates the Resonant Frequency of the LC tank circuit by entering the inductance and capacitance values. 45 dB is designed by creating two circle strips on the graphene. The feeding mechanism employs a circular capacitive structure to improve the impedance matching, specifically for microstrip patch antennas on thick dielectrics. Read Microstrip Antenna Design Handbook_Ramesh Garg_2001',open Chap 4, sec. A rectangular microstrip patch antenna is designed and simulated with CST software using 0. This paper shows a two-element multiple-input–multiple-output (MIMO) circularly polarized antenna. 70 dB and −25 dB at frequency 300. 95 mm and 80. 1 Transmission Line Method 3. There are different ways of designing stacked patches, primarily differing in the way their feed is. 588 mm possessing a refractive index of 1. Effect of changes in basic. TEM (Transverse electromagnetic) wave is the electromagnetic wave in which the electric field (E vector) and magnetic field (H vector) point purely transverse to the direction of propagation. The work is of practical importance for microwave researchers and. 03/10/2007: Online microstrip patch antenna calculator added in the TutorialsTools section. **Note: Like our stripline impedance calculator, all of our RF calculators allow SI prefix input. 4 GHz operation on a substrate with 2. The proposed antenna’s performance shows a good multiband operating at 2. 2 and with 40 mm×46 mm dimensions and height 1. Microstrip Line Calculator Analyze or synthesize a microstrip line based on substrate parameters and frequency. Version 2. 2[2]. 1. 0×25. Since the operating bandwidth of the conventional design is extremely narrow, a metasurface is utilized for bandwidth. The permittivity should be low for large bandwidth but high to make the patch antenna smaller. Also Configuration of Antenna with Double split ring metamaterial superstrate has been shown in Fig. 0×15. A schematic diagram of microstrip patch antenna. Microstrip Antenna Circular polarization can be obtained if two orthogonal modes with equal amplitudes are excited with a 90º time-phase difference. The Microstrip Patch Antenna Calculation Process. 2001, 49, 45–47. A simulation of sixteen (hexadeci) faced microstrip patch antenna design using slit on the edge is discussed here. Rochester Institute of Technology. . When the antenna is excited, the waves generated within the di-electric undergo reflections and the energyis radiated from the edges of the metal patch,which is very low. 56 mm, dielectric constant of 4. pm = patchMicrostrip creates a microstrip patch antenna. with permittivity 2. A stacked microstrip patch antenna with two parasitic patches, which is suitable for use in arrays and can be integrated with circuits, was proposed in [5]. The Cavity model method. By inputting values such as the operating frequency, substrate thickness, dielectric constant, patch height, and patch width, users can calculate the. 12LNO/0. 575mm is used in the simulation process. 7 dB were all accomplished by the antenna. The patch shapes in Figure 5. Basic Structure of Microstrip Patch Antenna Due to the fringing effects, the patch of the microstrip antenna looks greater than its physical dimensions as shown in Fig. The microstrip impedance calculator shown above uses Wadell’s equations for microstrip impedance, which can be found in the seminal textbook Transmission Line Design Handbook. The substrate parameters. Antenna design. This calculator uses the. Antennas Propag. Use the frequency and layer thickness/Dk value to determine the antenna size. 60mm. The proposed four branches Yagi array of microstrip patch antenna can also achieve a gain above 10 dB and a high front-to-back (F/B) ratio as much as 13 dB. The designed antenna is composed of a coplanar ground plane and it is printed on a FR4 dielectric substrate with a thickness of 1. The substrate parameters (ε r and h) are required. The microstrip patch antenna calculator determines the length (L) and width (W) of a rectangular microstrip patch antenna for a given resonant frequency or vice versa. Figure 1. λ = Signal wavelength in meter (m) = c/f ( where f = signal frequency, C = speed of light = 2. The microstrip antenna, Part 1: Basics. Patch Antenna Calculator (. 56 mm and width is 17. Share this resource Share this link with your friends, publish within popular social networks or send it via email. Here you can find some references for microstrip patch antenna design. Williams, S. This design approach helps analyzer microstrip inset-fed patch antennas and helps to locate the exact inset length for 50-? input impedance. 2 GHz frequency with edge feeding technique. 1. Center. 1 Design of circular microstrip antenna The geometry of circular microstrip antenna is shown fig. 0×4. The developed process started from designing the single element up to 1 × 8 arrays elements. By default, the patch is centered at the origin with feed point along the. 42MHz and 1598-1606MHz. The length of the dipole is usually one-half of the wavelength of the RF signals. INTRODUCTION Microstrip antennas basically consist of a radiating patch on one side of a dielectric substrate, which has a ground plane on the other side. However, application specific patch shapes are often used to optimize certain aspects of MSA performance. It shows that the proposed antenna resonates at frequency equal to 5. A microstrip width calculator can calculate the width of a microstrip. deepcold said: thanks. INTRODUCTION Microstrip antennas basically consist of a radiating patch on one side of a dielectric substrate, which has a ground plane on the other side. In 12, a dual-band antenna with an average gain of 2. 3. 23 GHz. 44 L5 5 W4 1However, in this paper, hexagonal microstrip patch antennas are designed and simulated for wireless backhaul at 3. 53 is designed to have a radius of 0. The patch has a compact structure of 6. A microstrip patch antenna is comprised of a radiating metallic patch situated on one side of a nonconducting substrate panel with a metallic ground plane placed on the other side of the panel. The radiation pattern of microstrip or patch antenna is. A slot or gap with a conducting coating on a dielectric substrate makes up a slot line, a form of transmission line comparable to CPW. r r d r r. Moreover, based on the simulation, the antenna with the. Fig. Panel antenna “Ellipse-patch 2х2” for 2100 MHz band. Solution freq. The microstrip patch antenna is a low-profile and robust planar structure. 2. The proposed antenna shows that the dualband operation depends on gap between parasitic element, split-ring resonator, length and width of microstrip line. Antenna “Flex” for 3G/4G & Wi-Fi. It shows that the proposed antenna resonates at frequency equal to 5. Design of a compact high gain microstrip patch antenna for tri-band 5G wireless communication. 2 Coaxial Feed (Coplanar Feed) 2. The antennas are supported by a rotating mount structure. The FR-4 dielectric board as well as the soldered SMA connectors were supplied by the chamber lab. The values of the proposed microstrip antenna with its parameters without slots Parameter mm Parameter mm L1= L feed 3 LG 15. The microstrip patch antennas were fabricated on FR4 substrate with different feed lines S 11 (dB) were measured with Network analyzer. Some of them include Microstrip, Stripline and Coplanar Waveguide. Description. 1 GHz is selected and 401The microstrip patch antenna is one of the most prominent antennas for THz band applications such future 5G communication systems and advanced wireless communication system. 2 GHz, The radiation efficiency, gain and directivity of proposed antenna are presented at 2. 4 GHz, ε r = 4. 2. Disadvantages include: Limited bandwidth (usually 1 to 5%, but much more is possible with increased complexity. The proposed antenna resonates at 27. well there are a lot of commercially available software's for the desiging microstrip patch antennas such as CST MWS, Ansoft HFSS, FEEKO, Antenna Magus, ADS. This antenna does not take any much extra size and can be etched on the same mobile PCB itself. An X-band, 12-element array of rectangular microstrip patches was demonstrated for the first time to reflect the main. A microstrip is a type of transmission line in which a strip of a conducting material like copper is mounted on a dielectric material and routed to a. The feeding method is a microstrip line feed. Keywords-Microstrip patch antenna, return loss, feed line, finite element methods, method of moments and radiation loss. The resonant frequency (rf) of a circular patch antenna is approximately given without considering the effect of probe radius by [1]: e r nm r a K c f 2S H * (1) where a e = effective radius of the circular patch c = velocity of light in free.