A NEW DUAL-POLARIZED GAP-FED PATCH ANTENNA

2008

In this letter, the design of inset fed microstrip antenna is proposed at 45deg and -45deg to achieve the optimum performance of the return loss, antenna gains and polarization loss. A design of the broadband dual-polarized microstrip antennas is proposed by using the simply inset feed technique but slant at desired rotation. In most applications, the requirement of propagation can be met with a single patch structure. However, in some cases, sharp beamwidth was required, as well as maintaining a low profile structure, which arise the development of microstrip patch array antennas. Both design of array antennas in this paper were connected using parallel feed quarter- wave transformer impedance matching technique.

International Journal of Information and Education Technology, 2012

A single probe-fed square patch antenna cut from a rectangular patch, having symmetric pattern of T slots is designed. The software used to model and simulate the microstrip patch antenna is Zeland Inc's IE3D software. IE3D is a full-wave electromagnetic simulator based on the method of moments. The proposed antenna is capable of generating resonant frequency with single feeds. The 50Ω feed position can be achieved by the feed points placed along the axis of the square patch. Experimental result for the characteristics of microstrip antenna are presented and discussed in this paper.

The Study of microstrip patch antenna has made great progress in recent years. Compared with conventional antennas, microstrip patch antenna has more advantages and better prospects. Microstrip Antennas have characteristics like low cost and low profile, smaller in dimensions and ease of fabrication make it well suited for various wireless service requirements. Moreover, the microstrip patch antennas can provide dual and circular polarization, dual frequency operation, broad band-width, feedline flexibility. In this paper we discuss the microstrip antenna, types of microstrip antenna, feeding techniques with their advantages and disadvantages over conventional microwave antennas.

A dual polarized microstrip patch antenna is proposed for Ku-band applications. The corner chopped square patch with four bent slots is adopted in this design. The antenna has a compact structure and the total size is 15 mm × 15 mm. The result shows that the impedance bandwidth (VSWR ≤ 2) of the proposed antenna is 950 MHz (7.76%). The antenna with reduced size is also able to achieve the stable radiation performance with a maximum gain of 7.6 dBi in the operating band of 11.76 GHz to 12.71 GHz and the gain variation is about 0.8 dBi. The present design provides a maximum of-26 dB isolation level between the two ports and a stable low cross polarization level for both E-and H-planes. Details of the proposed antenna design and results are presented and discussed. The patch shows a high matching level in Ku-band and isolation elements that makes it suitable for wireless and satellite communication. Dvojno polarizirana mikrostrip antena za Ku-frekvenčni pas Kjučne besede: dvojna polarizacija, mikrotrakasta antena, Ku-frekvenčni pas, visoka izolacija Izvleček: V prispevku opišemo mikrotrakasto anteno z dvojno polarizacijo za uporabo na Ku-frekvenčnem pasu. Antena ima kompaktno strukturo in je velika 15 mm x 15 mm. Rezultati kažejo pasovno širino (VSWR ≤ 2) 950 MHz (7.76%). Tako zmanjšana antena zmore stabilno sevanje z maksimalno ojačitvijo 7.6 dBi znotraj pasovne širine med 11.76 GHz do 12.71 GHz in stabilnostjo ojačitve znotraj 0.8 dBi. Trenutna zasnova omogoča maksimalno izolacijo med stopnjama-26dB in stabilno nizko križno polarizacijo med E in H ravnijo. V članku so opisane podrobnosti in rezultati predlagane zasnove antene.

This paper presents a high port isolation dual frequency orthogonally polarized rectangular patch antenna integrated with defected ground structure (DGS). A spiral-shaped DGS-integrated microstrip line enhances the port isolation of the antenna, while feeding the 2.45 GHz port, port-1 to the antenna and filtering out 3.0 GHz receiving signal from port-2.Similarly a rectangular shaped DGS-integrated microstrip line enhances the port isolation of the antenna, while feeding the 3.0 GHz port, port-2 and filtering out the 2.45 GHz signal from port-1. The microstrip line at two different ports integrated with DGS restricts the high order harmonics signals coming from transmitter or receiver. The patch is excited through microstrip feed line of 75Ω line impedance. DGS-integrated microstrip line offers image impedance of 150Ω and it is controlled by DGS geometry. An experiment of investigating isolation between the ports has been performed by employing with and without DGS. Measurements show an improvement of more than 25dB in the port isolation when DGS integrated microstrip antenna.

A single band microstrip patch antenna for wireless communication is presented. In this paper, direct microstrip line feed and coaxial feed techniques are integrated. This antenna offers low profile, narrow bandwidth, high gain, and compact antenna element. In this paper we compare the feeding techniques and we should proved that the coaxial feeding is better impedance matching technique than microstrip line feeding to improve the gain, return loss and bandwidth. The IE3D software, which is a method of moment (MoM) based software used to find output parameter results.

In this paper, a compact design of microstrip patch antenna for defense and satellite communication isdesigned and results are analyzed through HFSS.Three slots are loaded on the top of the patch to enhance the bandwidth of reference rectangular microstrip patch antenna.The simulated antenna return loss is-18.5dB at 6.75 GHz,-18.2dB at 11.8 GHz and found bandwidth of 82.2% and 38.03% at 6.75 GHz, 11.8 GHz respectively.

International Journal of Research in Engineering and Technology, 2016

In this paper, via hole drilled microstrip patch antenna employing two rectangular slots on patch, FR4 substrate having thickness of 1.6mm and dielectric constant of ɛ r = 4.4 has been proposed. The proposed antenna has been designed and analysed using Computer Simulation Technology (CST) Microwave Studio 2014. The proposed antenna has compact size, light weight and wide band operation. The via hole slot and rectangular slots have been cut in the proposed antenna in order to increase the return loss and impedance bandwidth of the antenna. The proposed antenna ground and patch has been designed using copper of thickness 0.1mm. It has been analysed that the proposed antenna has an impedance bandwidth of 725MHz with an operating frequency range of 2.6787-3.4038GHz and is resonant at 2.905 GHz. The gain, directivity and return loss of the proposed antenna are 4.52dB,4.011dBi and-72.93dB at resonant frequency of 2.905GHz, respectively. The proposed antenna can be suitably employed for Aeronautical, Weather Radar applications (2700MHZ-2900MHz), Civil and Military applications (2900MHz-3100MHz) and Satellite applications (3100MHz-3300MHz.

Open Engineering

In this paper, theoretical analysis of microstrip line fed rectangular patch antenna loaded with parasitic element and split-ring resonator is presented. The proposed antenna shows that the dualband operation depends on gap between parasitic element, split-ring resonator, length and width of microstrip line. It is found that antenna resonates at two distinct resonating modes i.e., 0.9 GHz and 1.8 GHz for lower and upper resonance frequencies respectively. The antenna shows dual frequency nature with frequency ratio 2.0. The characteristics of microstrip line fed rectangular patch antenna loaded with parasitic element and split-ring resonator antenna is compared with other prototype microstrip line fed antennas. Further, the theoretical results are compared with simulated and reported experimental results, they are in close agreement.

AEU - International Journal of Electronics and Communications, 2012

In this paper, a new feeding structure is applied in the patch antenna design to overcome undesirable features of the earlier multilayer feeding structures while maintaining their interesting features. To more readily understand the operation mechanism of proposed feeding structure, an efficient circuit model including the gapped strip-line feed mechanism has been also presented. It is known that proximity and aperture coupled feeding structures are sensitive to the transverse feed point location. In contrast, the proposed feeding architecture is very easy to fabricate and it overcomes the alignment difficulties arising from the proximity and aperture coupled feeding structures. In other words, the input matches of the antennas with different transverse feed point locations are significantly improved at the frequencies close to the antenna resonant frequency as compared to the conventional proximity-coupled patch antennas. The CST simulation results, analytic results and measurement ones show good agreement with each other.

2015

A design for dual band circularly polarized Microstrip Antenna (MSA)is presented in this paper. Microstrip line feed is used to energize the patch. CST microwave studio softwareis used to simulate the antenna design. Dual resonant frequencies are obtained by inserting a slot in patch. Resonant frequencies are obtained at 2.22GHz and 2.9GHz showing return loss of-18dB. Circular polarization is achieved by energizing the patch at two adjacent edges through a power divider. Axial ratios obtained at these frequencies are below the practical limit of 3dB. I.

Microstrip patch antennas are most commonly used in dense, conformal and low-cost wireless applications because of the advantages over the traditional antenna. In this paper, the small introduction of microstrip antenna along with various patch shapes are discussed in detail. Numerous techniques are used to improve the parameters such as bandwidth, return loss, gain, and efficiency of the antenna. In this paper, different feeding techniques such as coaxial cable, line feed, Aperture coupled and proximity coupled feeding techniques along with their advantages and disadvantages are discussed. The formulas used for calculating length and width of patch and ground antennas are provided. The antennas with different slots on patch such as Triangular slot, E shape, Single U shape, Double U shape, fractal techniques are discussed.

— In this paper, at first, a novel step by step method is introduced to design combined feed networks for Dual-band Dual-polarized Patch (DDP) antennas; considered as a 4-port network, 4-port DDP antenna element having defined operation bands and defined input impedances is converted into a 2-port DDP antenna. In this method, excitation of unwanted modes is blocked, and impedance matching of the 2-port antenna in the operation bands is also obtained. The calculations are based on transmission line model. Moreover, a 4-port aperture coupled DDP antenna is presented here in a new form, circular form, for GSM (890–960 MHz) and DCS (1710–1880 MHz) bands. This antenna consists of two aperture-coupled patches: a circular ring patch for the GSM band and a notched circular patch for the DCS band; both are printed on the same layer. Finally, the introduced method is used for the presented 4-port DDP antenna, and a 2-port DDP antenna suitable for application in the GSM/DCS systems is obtained. Details of the design and the experimental results are presented.

International Journal of Engineering and Technology, 2017

This paper presents the utilization of slots with full and partial ground plane in rectangular Microstrip Patch Antenna (MPA). The partial ground plane has been introduced to increase the bandwidth of designed antenna. Proposed antenna is designed on FR4 glass epoxy substrate with 1.6mm thickness and dielectric constant 4.4. Designing and simulation has been carried out by using HFSS V13 software. MPA with full ground plane works on four resonant frequency bands, but the value of gain and bandwidth is less. Proposed antenna with varying partial ground plane has been designed and observed that it adorns the optimal results at ground length 12mm. The MPA with partial ground plane with ground length 12mm works on two resonant frequency bands (2.21GHz and 7.06GHz) with the value of gain (3.92dB and 4.71dB) and bandwidth (949MHz and 1030MHz) respectively. These values are at the acceptable level which meets the requirement of wireless application such as bluetooth (2.41-2.49GHz) and point to point high speed wireless communication (5.92-8.5GHz). Keyword-MPA, FR4, HFSS, bluetooth, slotted patch, microstrip I. INTRODUCTION Microstrip patch antennas have been widely used in the field of wireless communications like mobile, radar and satellite because of its unique features such as compact size, ease of fabrication, low profile, less weight and ease of installation [2]. Now days, the antenna with multiband and wideband characteristics are more preferred in the wireless systems [3]. These antennas are capable of working on different applications when installed on wireless devices. By the use of multiband or wideband antennas a single device can be used for various wireless applications under specified range of frequencies [4]. Due to these features and large demand, microstrip antennas become a major area of research for the researchers [5]. Numerous researches have been carried out in recent years by the researchers to achieve multiband and wideband applications [6]. Slotted patch antennas are designed to achieve multiband characteristics [7]. But few drawbacks have been observed in this antenna design such as it exhibits less bandwidth and less value of gain [8]. To remove these drawbacks the work has been done on the ground plane of antenna because it acts as impedance matching circuit for the antenna [9]. Partial ground plane [10], defected ground plane [9], and slotted ground plane have been designed by many researchers to achieve wideband characteristics and high value of gain for different wireless standards [11]. These antennas can be capable of work under various wireless applications such as WiMAX, WLAN, Wi-fi, bluetooth, satellite communication and radar communication [12]. In this paper slotted rectangular patch antenna is designed for wideband applications. Proposed design is analysed for both the multiband and wideband characteristics by using full and partial ground plane. Detailed design and simulated results of proposed antenna with the variation in ground plane is discussed in section 2 and 3. II. ANTENNA DESIGN AND CONFIGURATION The proposed antenna uses the FR4 glass epoxy substrate board with the thickness of 1.6mm and dielectric constant 4.4. Proposed antenna is designed by using the frequency of 2.5GHz, which lie in the range of bluetooth application. Dimensions of the rectangular patch have been calculated by using the equations (1) to (5) as shown below [1]. By using these equations the length and width of proposed antenna is found to be 28.2mm and 36.5mm respectively. The line feeding technique is used to provide the excitation to the designed antenna and the position of feed is optimized to get a good impedance matching, hence located at the centre below the radiating element as shown in Fig. 1(a). Full ground plane with length and width equal to the dimensions of the substrate is shown in Fig. 1(b) and partial ground plane with width 45.6mm and length 10mm is shown in Fig. 1(c). In the proposed antenna design the slots has been introduced to obtain the novel structure of microstrip antenna. The exact position and the symmetry between the slots are very necessary to obtain the accurate results from the designed antenna. These slots help the antenna to exhibit multiband characteristics and are also helpful in increasing the gain and bandwidth of antenna. Process of designing the slots and positioning the slots in the

Microstrip patch antennas represent one family of compact antennas that offer a conformal nature and the capability of ready integration with communication system's printed circuitry. In this project, a 2.4 GHz circular polarization microstrip antenna is designed, constructed and measured. The microstrip antenna chose is a dual –fed circular polarized microstrip antenna. The antenna consists of rectangular patch and 3 dB hybrid. The dual – fed circular polarized microstrip antenna is etched on a FR4 with dielectric substrate of 4.5 with the height of 1.6 mm. Circular polarization is obtained when two orthogonal modes are equally excited with 90° phase difference between them. Circular polarization is important because regardless of the receiver orientation, it will always able receiving a component of the signal. This is due to the resulting wave having an angular variation.