Design of a Dual Polarized Rectangular Patch Antenna Using DGS

In this letter, a wide rectangle-shaped microstrip-fed 2.62 GHz slot antenna using defected ground structure (DGS) with a low design complexity is proposed to achieve wideband harmonic suppression. To accomplish this, two rectangular DGS (RDGS) with various positions and dimensions are etched into the ground plane, which could have a wide band-stop characteristic. Simulated and measured return losses indicate that proposed structure effectively suppress the third harmonic up to 23 dB between 3 and 10.5 GHz with a maximum ripple of 2 dB. In addition, the measured radiation pattern and peak gain of the antenna show at least 17 dB and 7.1 dBi, respectively suppression at the third harmonic frequency of 7.86 GHz.

IEEE, 2016

A high gain shared aperture dual-band dual-polarized (DBDP) patch antenna is proposed in this work. Dual polarization is obtained by exciting the antenna in two orthogonal directions using two separate ports. Higher order resonant mode is used to obtain higher gain. The antenna transmits and receives in L and S bands simultaneously with good isolation between the ports. Improved isolation is obtained by using an L-shaped slot and non-shorting pins on and below the radiating patch, respectively. A prototype element is fabricated. Isolation between the ports is 21 dB at 1.48 GHz and 39.25 dB at 2.59GHz. The measured gains in the broadside directions are 6.2 dB and 5.5 dB at the respective frequencies.

American Scientific Research Journal for Engineering, Technology, and Sciences, 2018

In this paper, a quite simple design of a double-sided triangular patch antenna has been proposed. An efficient technique utilizing the Defected Ground Structure (DGS) has been employed. A simple double-sided triangular slot in the ground plane helped to increase the band-width and shift the resonant frequency from 6.37 GHz to 4.97 GHz without modifying the basic geometry of the antenna. The reflection coefficient of the final design of the proposed antenna showing a good matching at 4.97 GHz with a bandwidth equal 647 MHz, a return loss of less than -10dB and voltage standing wave ratio (VSWR)<2. Microstrip patch antenna (MPA) has been designed and simulated using FEKO simulator software based on FDTD solver. Microstrip line is used to feed the antenna. The simulation results are found to be in good agreement with the measurement’s results. Results indicate that the double-sided triangular defected ground structure is effective in suppressing spurious radiations, and the patch a...

2021

This paper proposes unique design technique using defected microstrip surface (DMS) for the suppression of higher mode, reduced cross polarization (XP) and improved isolation. The proposed technique can be easily adapted to any conventional working rectangular microstrip patch antennas (RMPA) in the practical applications. The modification can be made by etching the rectangular slots called DMS of optimized dimensions in the rectangular microstrip patch. This will enhance the radiations by suppressing XP radiations and eliminates nearby undesired higher order mode, which is the source for the XP radiations. In this design the conventional RMPA is designed to resonate at 3.04 GHz with broad side radiations with co-polarized peak gain of 5.2dBi and XP of -15.5dB. The proposed RMPA resonates at the same frequency with a gain of 6dBi. The XP is significantly suppressed by 31dB and it is -46.5dB over the span of ±500, with co-pol to cross-pol isolation of 52.5dB is achieved for S-band ap...

Two wide rectangle-shaped microstrip-fed 2.6-GHz slot antennas using defected ground structures (DGSs) with a low design complexity are proposed to achieve wideband harmonic suppression. To accomplish this, two rectangular DGSs (RDGSs) in the first antenna and two circular DGSs (CDGSs) in the second one with various dimensions are etched into the ground plane, which could have a wideband-stop characteristic. Simulated and measured reflection coefficients indicate that the two proposed structures effectively suppress the second and third harmonics up to 23 dB between 3.5 and 10.5 GHz with a maximum ripple of 2.4 dB. In addition, the radiation patterns and peak gains of the antennas can be suppressed at least 17 dB and 7.1 dBi, respectively, at the third harmonic frequency of 7.86 GHz.

Microwave and Optical Technology Letters, 2017

Defected ground structure (DGS) consisting of 2 I-shaped etched-out patterns underneath a microstrip line with an inverted L-shaped stub is proposed to suppress all higher harmonics up to fourth harmonic of an inset cut microstrip patch antenna. The overall size of the proposed DGS and the position of the stub are optimized to achieve wide stop-band characteristics. All the higher order harmonics are investigated and suppressed successfully by utilizing the proposed compact DGS of area 24%-96% smaller than that published in other related articles. The overall length of the proposed DGS is successfully formulated and verified at the desired resonating frequency of the stop-band. The antenna is designed for ISM band (2.41-2.46 GHz) applications. An equivalent circuit of the proposed DGS is also modeled and the same is verified using ADS 2009. The simulated results are validated experimentally and good mutual agreements between the simulated and experimental results are observed.

Law, State and Telecommunications Review

Purpose – If the two or more than two antennas are present in the antenna array, the mutual coupling between them becomes a critical issue to deal with. At microwave frequency, microstrip design is often used as a transmission line because of its good performance in transferring the energy and microwave signals. Most commonly used microstrip antenna has similar structure as that of the microstrip line. On one side of dielectric substrate layer, is an extremely thin layer of conductor that forms the radiating elements and on bottom side is the ground plane made up of metallic material. Our main motive is to maintain mutual coupling suppressing structure to its simplest form. Methodology/approach/design – We therefore use a Defected Ground Structure (DGS), which greatly decreases the mutual coupling between the two antennas, thus enhancing the performance of the antenna array. Findings – The introduction of the DGS does not affect the characteristics of antenna array system. The Simul...

Journal of Electromagnetic Waves and Applications, 2017

A simple cross type defected ground structure (CDGS) integrated rectangular microstrip antenna (RMA) has been proposed to achieve broad bandwidth along with augmented (improved) co-polarized to cross-polarized radiation (CP-XP) isolation over principal and diagonal planes. In this design, a crucial emphasis is given for concurrent improvement of both bandwidth and polarization purity of microstrip antenna without hampering dominant mode fields. Around 25-28 dB CP-XP isolation is achieved over wide elevation angle with the proposed structure with 25% impedance bandwidth. The simulated and measured results show a close resemblance with each other. The proposed geometry is very simple, easy to fabricate and therefore helps in effortlessness manufacturing process. Therefore, the present structure appears to be ideal in numerous applications where polarization purity is the key issue over the wide bandwidth.

IEEE Antennas and Wireless Propagation Letters, 2009

Application of defected ground structure (DGS) to suppress cross-polarized (XP) radiation from a microstrip patch antenna has been reinvestigated using a new DGS geometry for much improved characteristics. Arc-shaped defect has been used in pair, symmetrically located under a circular patch. A number of optimization parameters have been examined using simulated results, leading to a design indicating improved XP behavior. A set of identical prototypes, with and without DGS, have been experimentally studied. The presence of the DGS shows as much as 30 dB isolation of the XP level from its peak radiation, and that compared to an identical patch without DGS indicates an improvement by as much as 12 dB. The relative suppression in XP values are found to be around 7-12 dB over 75 elevation around the boresight of the patch.

Progress in Electromagnetics Research C, 2010

In this paper, a new compact dual-polarized microstrip patch antenna is proposed. The patch is of rectangular shape and fed by a gap between the patch edge and a microstrip open end. Gap feeding at the edge of a rectangular patch antenna is proposed for the first time in this paper. This method of feeding occupies a negligible space compared to other feeding methods such as a quarter-wave transformer feeder, an inset feeder, a proximity coupler, and an aperture-coupled feeder. Dual-polarized radiation is realized by feeding a rectangular patch with two orthogonal gaps. First, a single-polarized patch is designed. The impedance matching property of the gap is analyzed using an equivalent circuit. Next, starting from dimensions of the single-polarized patch, a dual-polarized patch antenna is designed by optimizing the patch length and gap width. The designed antenna is fabricated and tested. The fabricated antenna has reflection coefficient less than −10 dB, port isolation greater than 30 dB, over 14.5-15.2 GHz, and a gain of 6.2 dBi at 14.9 GHz.

International Journal of Computer Applications, 2014

In this research paper, the design of C-shaped Defected Ground Structure (DGS) antenna is proposed to realize dualband characteristics for C-band and X-band applications. The proposed antenna consists of C-shaped slot incorporated in ground plane which resonates at two different frequencies (f r1 and f r2) of 7.41 GHz and 9.28 GHz which lie in C-band and X-band respectively. A very good return loss (S 11) of-30.79 dB and-40.75 dB are obtained at first and second resonant frequencies respectively for C-shaped DGS antenna. The Bandwidth of C-shaped DGS antenna is increased by 825 MHz and 1182.8 MHz respectively at two different bands than the bandwidth of the Conventional Rectangular Microstrip Patch Antenna (CRMPA). Also VSWR is much improved with C-shaped DGS antenna. The comparison of simulated results of proposed and CRMPA has also been presented in this paper. The main contribution of this paper is the miniaturization of ground plane of 23% using C-shaped DGS which is very much encouraging.

2018

Murthi Mahadeva Naik G, Naveen Kumar S K, Meghavarshini S K, Soujanya N S Associate Professor, Professor, PG Students Department of ECE, Malnad College of Engineering, Hassan, Karnataka, India-573202 Department of Electronics, Mangalore University, Mangalore, Karnataka, India-573202 Department of Electronics, University of Mysore, Hemagangothri PG center, Hassan, Karnataka, India-573201 PG Students, Department of Electronics and Communication, Malnad College of Engineering, Hassan, Karnataka, India-573202

IEEE Antennas and Wireless Propagation Letters, 2005

A defected ground structure (DGS) is proposed to reduce the cross-polarized (XP) radiation of a microstrip patch antenna. The proposed DGS pattern is simple and easy to etch on a commercial microstrip substrate. This will only reduce the XP radiation field without affecting the dominant mode input impedance and co-polarized radiation patterns of a conventional antenna. The new concept has been examined and verified experimentally for a particular DGS pattern employing a circular patch as the radiator. Both simulation and experimental results are presented. Index Terms-Circular microstrip antenna, defected ground structure (DGS), low cross polarization, microstrip antenna.

IEEE Antennas and Wireless Propagation Letters, 2014

A simple rectangular microstrip antenna on slot type defected ground plane is proposed for reduced cross polarized (XP) radiation and justified theoretically. This will reduce the XP radiation field compared to conventional microstrip antenna without affecting its Co-polarized radiation (CP) characteristics. Index Term: Defected ground plane, Co polarized radiation, Cross polarized radiation, Microstrip antenna.

The need of multiband, larger gain and low profile antennas to support multiple wireless applications led to the design of Microstrip antennas. Microstrip antennas due to their small profile design take less area. Further they can be modified by two techniques that are introducing defect in ground plane and adding layers to the conducting surface in order to improve its gain, VSWR, bandwidth, return loss and directivity. This paper presents the changes in the above characteristics of micostrip patch antenna with addition of defect and different shape of defects. The proposed antenna is simulated on Duroid substrate with dielectric constant of 2.2 and fed with 50 ohms microstrip line using HFSS software. By introducing the defect in the ground plane and changing its shape the corresponding changes in the characteristics have been noted for 2.4GHz of resonant frequency.