Both h and v polarization signals are input on the bottom c4 pads from ics, fan out on the m6 layer, and feed radiator structures located on the m12 and m14 layers, respectively. This simple concept is important for antenna to antenna communication. The geometry of the proposed dual mode cp patch antenna is shown in figure 1. For a single source, the system has to somehow either select one polarization or the other or the system has to properly combine them. An improved theory for microstrip antennas and application, ieee trans. It was decided to design a patch antenna from the theoretical study since it fulfils all the requirements for the antenna. A new circular polarization dual feed microstrip square patch. This procedure was executed with the aid of autocad. By stacking two different cornertruncated square patches in a dielectric substrate layer, the microstrip antenna for dualfrequency circular polarization cp can be achieved with 11.
Based on cavitymodel theoretical analysis, a test dualpolarized microstrip patch antenna fed by double slotcoupled feeds with a 180degrees phase shift and a. A patch antenna with dualband and dualpolarization operation is proposed and discussed. As the author said, the patch antenna is orthogonally fed by two cpws, the antenna can work at 2. A dualpolarized antenna is designed, fabricated, and measured. Dualpolarized aperturecoupled wideband microstrip patch. Dual frequency operation of the antenna has become a necessity for many applications in recent wireless communication systems. There are three major studies in mimo which are research on array antenna and adaptive signal processing, research on information theory and coding algorithm.
Dual band and dual polarized microstrip patch antenna. Does a dualpolarized antenna mean an antenna of an roughly equal copolarization and crosspolarization. Due to the fact that the radiating apertures of the two edge patches are relatively smaller compared to. Design of a dualpolarized microstrip patch antenna with excellent. Dual linear polarization with low cross polarization and high isolation has previously been reported using a cross shaped microstrip patch antenna. Moreover, there is a null appears in eplane pattern result of 1x4 array patch design which decrease the hpbw lower than 2x2 dual polarization array antenna. It is a simple structure and available patch antenna for band. A wideband, dual polarized printed antenna is designed and developed in this paper. Design simulation and fabrication of microstrip patch antenna 349 the proposed antenna is designed in lte band ii for 4g mimo communication. The printed antenna has a measured 10 db return loss bandwidth of 52% and an isolation between the excitation ports of greater than 39 db over this frequency. A length compensation technique is proposed to achieve the exact dual mode resonance with the desired accuracy. In this paper, a dualband dualpolarized stacked patch antenna is proposed by employing four straight probes for orthogonal polarization.
This paper investigates a cornerfed microstrip patch antenna by means of the. Can be designed for dual polarization operations 8 can be designed for dual or multifrequency operations. A probefed square patch is used with a centre crossshaped asymmetric slot for circular polarization and edge slots for dual frequency applications. Design of dual band dual polarized microstrip patch antennas core. It consists of a flat rectangular sheet or patch of metal, mounted over a larger sheet of metal called a ground plane. This thesis work started with a theoretical study which investigated four common antenna types dipole, loop, pifa and patchmicrostrip to evaluate which antenna. Tm stands for a magnetic field distribution between patch and ground that is transverse to the zaxis of the antenna shown in figure 1. Dualband and dualpolarization patch antenna with high isolation. These minima and maxima continuously change side like the phase of the rf signal. Chapter 2 presents the basic theory of mpas, including the basic structures, feeding techniques and.
Dual lshaped strips or single modified lshaped strip that employs electromagnetic. Anyone can give comments or tell me some references or books about the definition of dualpolarization. The novel design is achieved by etching out a symmetric pattern of crossed slots from the surface of a square probefed patch. Some dual circularly polarized cp patch array antennas 20, 21 are proposed to mitigate the multipath.
It is important to match the polarization of the rf antenna to that of the incoming signal. Wave polarization and antenna polarization antenna theory. The measured results include the return loss and the impedance bandwidth of the antennas. Design of dualpolarized lprobe patch antenna arrays with. For feeding the antenna, it is used the electromagnetically. Design of circular polarized dual band patch antenna diva. The analysis of a single patch microstrip antenna based on the impedance model, emphasizing mainly the design considerations for dualband and dualpolarization, is presented here. When it is moved to the slot center or open end of the inf antenna, the impedance. A dualfeed technique is introduced to achieve high isolation. Thus, probesinglefeed dbdmdp antenna is realized with lowprofile property of 0. An experimental study of a dualpolarized lprobe patch antenna is presented.
Although good dualband cp characteristics can be achieved, their frequency ratios. The antenna is designed based on a typical dualband stacked patch antenna that consists of two square radiating patches. The goal is to understand the radiation mechanism, polarization, patterns, impedance and bandwidth. New analytical expressions for the input and mutual impedance of two kinds of dual. Compact wideband dualpolarized microstrip patch antenna. This optimization method greatly reduced the time needed to find viable antenna parameters. A compact dualpolarized double shaped patch antenna. In this paper, a dualpolarized patch antenna capacitively coupled through four feeds is proposed. Crosssection view of dual polarization probefed microstrip stacked patch antenna element. Design of dual band dual polarized microstrip patch antennas. Two patches work in different bands, respectively, and emit dualband circularly polarized radiation. The basics of patch antennas, updated orban microwave. Simulations and tests shows that the antenna is circular polarized and have a.
Measured impedance of selected stacked patch element and the transmission between the ports. In any illustration, the sketch drawn to represent the radiation of an antenna is its radiation pattern. A novel dualbroadband circularly polarized patch antenna. The dual fed circular polarization microstrip antenna is. A multilayer organic package with 64 dualpolarized. The radiation elements are composed of the inner crossshaped patch and the outer annular patch which are printed on the same surface of one substrate. The proposed method provides several alternative dimensions lengths of the patch.
The paper demonstrates a suspended rectangular and also circular patch antennas with electromagnetically coupled inverted microstrip feed first, for linear polarization and second, for dual linear polarizationsfrequency operation at kukband frequencies. A new design for a dual polarized aperture coupled patch antenna is presented. Figures 3 and 4 illustrate the vswr and gain of the antenna. Inset shows the geometry of a circular patch antenna with segments removed for a similar experiment. In theory, the gain can be made as high as one wishes by. They are the original type of microstrip antenna described by howell in 1972. Therefore, singlelayer singlefeed patch antennas for dualband circular polarization have been proposed 58, which were realized by loading two pairs of arcshaped slots in a circular patch 5, or yshaped or tshaped slots in square patch 6. A broadband dualpolarized microstrip patch antenna with aperture.
Reduced size, dualpolarized microstrip patch antenna for. To meet these requirements many various dualpolarized antennas have been developed 16. An antenna can be made to have a choice of two polarizations, or have two polarizations available simultaneously. A dual input patch antenna with over 30% bandwidth in the xband was simulated using ansofts high frequency structural simulator hfss in. A wideband dualpolarized stacked microstrip patch antenna. The design specifications for the antenna are given as below. Design of circular polarized dual band patch antenna.
Dualpolarized microstrip patch antennas could provide these features with low cost and easy fabrication. Some of these works have used an aperturecoupled feed to improve bandwidth and isolation. Dual polarized wideband aperture stacked patch antennas. A dualpolarized crossstacked patch antenna with wide. The polarization of an antenna is the polarization of the radiated fields produced by an antenna, evaluated in the far field. The design parameters of the antenna are optimized using commercial softwares microwave office and zeland ie3d to get the suitable parameters and radiation patterns. The frequency characteristics of the input impedance, vswr, and isolation are analyzed and verified by the published data and experiments. Dual linearly polarized microstrip array antenna intechopen. Generation of broadband highpurity dualmode oam beams. Here is the link page to the various patch antenna and microstrip antenna topics. Firstly, based on cavitymodel theory, the antiphase tech. A dual polarized, kuaband patch antenna using hybrid ltcca. A dualpolarized crossstacked patch antenna with wideangle and low crosspolarization for fully digital multifunction phased array radars abstract.
One can simply understand the function and directivity of an antenna by having a look at its radiation pattern. The dual polarized antenna yields a bandwidth of 20. Cornerfed microstrip antenna analysis for dual polarization. The selected microstrip antenna is a dualfed circular polarized microstrip antenna. The theoretical analysis is based on the finitedifference timedomain fdtd method. Ultrawideband dualpolarized patch antenna with four.
The polarization or polarisation of electromagnetic em waves or fields is introduced. A dualpolarized shorted microstrip patch antenna for wideband application kenny s. There are various types of microstrip antennas able to excite a circular polarization. This paper presents a novel dualband circularly polarized patch antenna for precise satellite navigation. Design simulation and fabrication of microstrip patch antenna. Antennas having dual polarization can be used to obtain polarization diversity. Reduction in patch size of up to 51% with respect to a traditional dualpolarized square patch operating at the same frequency is obtained. The antenna is based upon an aperture stacked patch layout and incorporates a simple duallayered feeding technique to achieve dualpolarized radiation. The enhanced bandwidth is achieved by using a stacked patch configuration and dumbbell shaped slots. A dualband circularly polarized stacked microstrip antenna for ism bands 2. This website is intended to be a source of knowledge for learning about and understanding antennas. The slot antenna can be considered as a loaded version of the inf antenna. Schematic of a rectangular patch antenna electromagnetically coupled to two inverted microstrip line feeds for dual linear polarization and frequency.
Highisolation dualpolarized microstrip antenna via. Many efforts have been made on the dualpolarization slotcoupled patch antennas to achieve sufficient bandwidth, low back radiation, low levels of crosspolarization, high efficiency, and high isolation 6. Compared with other dualpolarized patch antennas reported, the bandwidth of the proposed antenna is significantly increased and an impedance bandwidth of over 110% is. Linear polarization horizontal or vertical pole is discussed. In 16, singlefeed, circularly polarized cp stacked plate antenna is used for uhf rfid reader applications.
Pdf a wide band dualpolarized microstrip patch antenna. A lowcost, easytofabricate, wideband and highgain dualpolarized array antenna employing an innovative microstrip slot patch antenna element is designed and fabricated. A wideband highgain dualpolarized slot array patch. Cross section of a patch antenna in its basic form a half wave long patch operates in what we call the fundamental mode.
The axial ratiospectrums and the current distribution are used for demonstrating the cp. A dualpolarized aperturecoupled patch structure with air cavity is implemented for the antenna array. An autolisp program appendix a was written to compute and draw the sinuous curve based on the above equations and rules, given the design parameters. Dual feed microstrip patch antenna for wlan applications.
When the feed point is moved to the shortcircuited end of the slot or inf antenna, the impedance decreases. A highprofile dual lp bowtie dipole array antenna achieves a wide bandwidth of 25% 19. In this paper, dual fed circular polarization microstrip antenna was chosen. And the proposed antenna has smaller size than two single polarized antenna working at the same frequency. An antenna has linear polarization if the field vector electric or magnetic for the transmitted wave of the antenna only has one component or two orthogonal linear component that are in time phase or 180oor multiples of 180o out of phase 4. This leads into the discussion of antenna polarization. The antenna is operating in lte band ii having frequencies of 1850 mhz1910 mhz which is. Rhcp and lhcp left and right hand circular polarizations are described.
In the following contribution, the design of a high performance antenna element with dualpolarization, wide scan angle, and low crosspolarization levels for phased array radars is reported. Circularly polarized s band dual frequency square patch. A broadband fourfeed circular patch antenna is demonstrated to generate highpurity dualmode vortex beams carrying orbital angular momentum. In this communication, two slot structures mounted orthogonally are introduced to form dualpolarization antenna with high port isolation. Current distribution on the patch surface and location of the feed. Radiation is the term used to represent the emission or reception of wave front at the antenna, specifying its strength.
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