Triple-stacked microstrip patch antenna for multiband system

This paper presents the implementation of open complimentary split ring resonator (OCSRR) structure in small rectangular radiating elements to achieve triple band and dual band reconfigurability using PIN diode. The proposed design is a coplanar waveguide fed structure and consists of three small radiating elements, whereas two OCSRR structures are coupled with the two‐radiating elements. The third radiating element embedded with OCSRR is connected using a PIN diode. Under DC biasing conditions the whole design resonates at three frequencies, that is, 1.9, 3.8, and 5.5 normalGnormalHnormalz, whereas the proposed design switches to dual band operation at 2.6 and 5.5 normalGnormalHnormalz in the diode ‘OFF’ state. The proposed structure is designed and fabricated on a single sided ungrounded FR 4 substrate. Overall, a good agreement between simulated and measured results is observed. It is also observed that the radiation patterns of the proposed antenna are the same with gains of 4.5, 3.2, and 2.5 normaldnormalBnormali at 1.9, 3.8, and 5.5 normalGnormalHnormalz in the PIN diode ‘ON’ state, respectively, whereas in the diode ‘OFF’ state, at 2.6 normalGnormalHnormalz the gain is 4 normaldnormalBnormali and at 5.5 normalGnormalHnormalz the gain is 2.5 normaldnormalBnormali.

Section: Introductionmentioning

confidence: 99%

A compact open complementary split ring resonator inspired triband reconfigurable coplanar waveguide fed antenna

Rasool

Farooq

Rashid

et al. 2018

“…The stacked antenna is a well‐known structure for increasing the gain and bandwidth of the patch antennas. The stacked patches are used in single and array formation with various shapes such as rectangular truncated or circular .…”

Section: Introductionmentioning

confidence: 99%

Patch array antenna with cavity‐backed SIW feed for X‐band applications

Kamalzadeh

Arand

2015

In this article, a new arrangement of patch array antenna incorporated with cavity back substrate integrated waveguide (SIW) and stacked structure is which operating at X‐band, is presented. The proposed structure enhances the gain and bandwidth of the array antenna markedly. The prototype antenna contains a 2 × 2 patch array formation with compact feed network that helps to miniaturize the structure and improve radiation properties in antenna. The inner metallic posts inside of the antenna limit the propagation of the lower mode and therefore TM220 mode is propagated as a dominant mode. For designing of the antenna, equivalent cavity model is used, but for the final full wave simulations, it is replaced with SIW configuration. The stack layer is added to the antenna to improve its bandwidth, efficiency, and gain. The proposed antenna is fabricated on RO4003 substrate with thickness of about 0.8 mm, and total dimensions of 38 × 38 mm2 and stacked layers are etched on RT‐Duroid 5880 substrate with thickness of 1.6 mm. An acceptable agreement is obtained between measured and simulated results. The proposed antenna has 2.7% bandwidth and at the center frequency (9.01 GHz) its gain is 10.8 dBi with 95% efficiency and 25.02 dB front to back ratio. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:319–323, 2016

“…In both categories, the development of broadband and multiband microstrip antennas is possible, as reported in the literature [1][2][3][4][5]. However, the main problem in many cases is maintaining uniformity of the radiation pattern and input impedance over the operating bands.…”

Section: Introductionmentioning

confidence: 99%

“…Besides, it can be recognized that, as far as most of the applications are concerned, the reconstruction of a buried target involves the identification of only a few parameters with regard to the geometric and dielectric properties of the target. For this reason, Caorsi et al proposed the use of neural networks to perform the online inversion of electromagnetic data scattered by buried scenarios and to recover the reconstruction of the physical properties of the investigated objects on the field with respect to the measurement campaign [4,5]. In particular, attention has been focused on the use of multilayer perceptrons (MLPs) with supervised learning [6].…”

Section: Introductionmentioning

confidence: 99%

“…In the past, the inverse-scattering problem has been considered firstly in the frequency/spatial domain by simulating a measurement system in which multiple receivers were exploited while a monochromatic source illuminated the numerical domain [5]. However, this kind of analysis seems to be only slightly useful for a practical application of the algorithm, since it requires the presence of multiple receiving antennas on the GPR equipment, thus leading to increased expense and large equipment volume.…”

Section: Introductionmentioning

confidence: 99%

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Effects of upper‐patch displacement on the operation of dual‐band stacked microstrip patch antennas

Akhavan

Mirshekar‐Syahkal

2004

INTRODUCTIONAs wireless technology advances, it is expected that multiband operation will become the future key requirement for many radio subsystems and components. Taking into consideration the merits of microstrip antennas, including their low profile, low cost, and ease of manufacturing, it can be expected that some wireless systems will be using dual-band microstrip patch antennas in the future.Past studies related to microstrip patch antennas can be classified into two main categories: single-layer and multilayer patch antennas. In both categories, the development of broadband and multiband microstrip antennas is possible, as reported in the literature [1][2][3][4][5]. However, the main problem in many cases is maintaining uniformity of the radiation pattern and input impedance over the operating bands.This paper is concerned with dual-band stacked microstrip patch antennas and, in particular, addresses the effects of the displacement of the upper patch in the resonant direction on the operating frequencies, input impedance, and radiation patterns. RESULTSThe generic structure of the stacked microstrip patch antenna is shown in Figure 1. It is a two-layer structure with both patches having identical dimensions. The feeding, which is through a microstrip line, is restricted to the lower patch and, hence, the upper patch is electromagnetically coupled to the lower patch. Provided that the upper dielectric layer is not very thick, the coupling between the two patches is strong and the stacked microstrip patch antenna acts as a dual-frequency antenna.The performance of the antenna is simulated using Momentum ADS software by Agilent Technologies [6], which is a full-wave electromagnetic solver based on the method of moments (MoM). As shown in Figure 1, the physical and electrical parameters of the antenna analysed in this work are: L ϭ 3.7 cm, W ϭ 4.5 cm, d ϭ 0.159 cm, r ϭ 2.5 cm, and tan␦ ϭ 0.0025. Figure 1 shows the displacement Xs of the upper patch with respect to the lower patch in the resonant direction.The validity of the simulation is checked, initially, by comparing the simulated and measured input impedances of the antenna when the displacement Xs ϭ 1 cm is considered (see Fig. 2). The measurement results were presented in a previous work [1]. From Figure 2, it is clear that there is generally a good agreement between the simulation and measurement results. In fact, as far as the resonant frequencies are concerned, at the lower resonance the two results are in close agreement and at the upper resonance they are within 3% of each other. Any discrepancies in the measured and simulated values of the input impedances are mainly due to the feeding mechanisms, which are different in the simulations and measurements. In the measurements, coaxial feed has been used [1].The effects of the displacement of the upper patch on the input impedance and resonant frequency were then simulated for a set of values of Xs. Figure 3 shows the variation of the real part of the input impedance with the displacement of the upp...