Array Of Square Parasitic Patches Research Articles

Gain enhancement of UWB antenna using partially reflective surface

AbstractThis paper proposes, a high gain, Fabry Perot cavity antenna with coplanar waveguide (CPW) fed ultra wide band (UWB) radiating element. The proposed antenna has flat edge arrow shape-based radiating element, which act as a main radiating element and responsible for UWB radiation. This UWB microstrip antenna is parasitically coupled with an array of square parasitic patches (PPs), which act as partially reflective surface. The square patches are fabricated at the bottom of inexpensive FR4 substrate and suspended in the air with the help of dielectric rods at 1.5λ0 height. High gain is obtained by resonating PPs at near close frequencies of 3.8–8.8 GHz UWB, where partially reflective surface gives almost positive reflection phase gradients. Two laboratory prototypes of antenna, one with and another without partially reflective surface are fabricated and tested. Details of the proposed antenna design and role of partially reflective surface in gain enhancement of planar CPW fed UWB antenna are described, and typical experimental results are presented and discussed.

Efficient, high gain with low side lobe level antenna structures using parasitic patches on multilayer superstrate

AbstractIn this article, we propose efficient high gain with low side lobe level (SLL) antenna structures using parasitic patches (PPs) on multilayer superstrates. The antenna structures consist of a microstrip antenna that feeds an array of square PPs fabricated on multilayer FR4 superstrates. The patches fabricated on multilayer superstrate are suspended in air with the help of dielectric rods at integral multiple of λ0/2. The structure with 9 × 9 array of square PPs on a superstrate layer at λ0/2 provides a gain of 19 dB, which increases to 21.1 and 21.8 dB when the superstrate layer height is increased to 1.0 and 1.5 λ0, respectively. However, SLL increases with increase in superstrate height. Gain enhancement with low SLL is achieved using PPs on multilayer superstrate. The antenna with 3 × 3 and 9 × 9 array of square PPs on superstrate layers at 0.5 and 1.5 λ0, respectively provides a gain of 22.7 dB with 92% efficiency, SLL of −22.3 dB and front to back lobe ratio of more than 20 dB. Structure is designed, fabricated, and tested. The measured VSWR is <2 over 5.725–5.875‐GHz frequency band. The proposed structure is an attractive solution for several wireless communication systems, such as base station cellular systems, satellite systems, and point‐to‐point links. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:1488–1493, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26818

HIGH-GAIN LOW SIDE LOBE LEVEL FABRY PEROT CAVITY ANTENNA WITH FEED PATCH ARRAY

In this paper, a high gain, low side lobe level Fabry Perot Cavity antenna with feed patch array is proposed. The antenna structure consists of a microstrip antenna array, which is parasitically coupled with an array of square parasitic patches fabricated on a FR4 superstrate. The patches are fabricated at the bottom of superstrate and suspended in air with the help of dielectric rods at 0:5‚0 height. Constant high gain is obtained by resonating parasitic patches at near close frequencies in 5.725{5.875GHz ISM band. The structure with 9£9 square parasitic patches with 1:125‚0 spacing between feed elements is fabricated on 5‚0 £ 5‚0 square ground. The fabricated structure provides gain of 21.5dBi associated with side lobe level less than i25dB, cross polarization less than i26dB and front to back lobe ratio of more than 26dB. The measured gain variation is less than 1dB and VSWR is less than 2 over 5.725{5.875GHz ISM band. The proposed structures are good candidates for base station cellular systems, satellite systems, and point-to-point links.

Efficient high gain with low sidelobe level antenna structures using circular array of square parasitic patches on a superstrate layer

AbstractThis article proposes efficient high gain with low sidelobe level (SLL) antenna structures using circular array of square parasitic patches (CASPPs) for wireless applications. The antenna structure consists of a microstrip antenna that feeds a CASPP fabricated on a low cost FR4 superstrate. The patches on superstrate are suspended in air at about λo/2. The structure with 19‐element CASPPs is designed, fabricated, and tested. The measured VSWR is <2 over 5.725–5.875 GHz frequency band. The antenna with a single square patch provides a gain of 12.6 dB; whereas, the antenna with 19‐element CASPPs provides a gain of 18.3 dB with 93.4% efficiency, SLL of −26.1 dB, and front to back lobe ratio of >20 dB. Antenna with CASPPs on finite ground requires 25% less ground plane size as compared to planar array. The proposed structure can be packaged inside an application platform. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:2812–2817, 2010; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25613

Effect of superstrate material on a high‐gain antenna using array of parasitic patches

AbstractThis article highlights the effect of superstrate material on a high‐gain antenna using array of parasitic patches for wireless applications. The antenna structure consists of a microstrip antenna, which feeds an array of square parasitic patches fabricated on a ceramic or FR4 superstrate. The patches on a superstrate are suspended in air at λ0/2. The spacing between parasitic patches and patch dimensions decrease with dielectric constant and, thus, a compact antenna with almost same gain can be designed with high dielectric superstrate. The structures with 5 × 5 array of square parasitic patches provide a gain of 17.5 dB on infinite ground plane in both the cases but the array dimension is 55 × 55 mm2 in ceramic as compared to 115 × 115 mm2 Antenna with ceramic superstrate on finite ground requires 25% less ground plane size as compared to FR4. Structure with FR4 superstrate is designed, fabricated, and tested. The measured VSWR is <2 over 5.725–5.875 GHz frequency band. The antenna with 5 × 5 array of square parasitic patches provides a gain of 18.0 dB with 92% efficiency, SLL of −18.4 dB, and front to back lobe ratio of more than 20 dB. The proposed structure can be packaged inside an application platform. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 82–88, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24850

Low cost efficient high gain antenna using array of parasitic patches on a superstrate layer

AbstractThis article proposes a low cost efficient high gain antenna using array of parasitic patches for wireless applications. The antenna structure consists of a microstrip antenna which feeds an array of square parasitic patches fabricated on a low cost FR4 superstrate. The patches on superstrate are suspended in air at λ0/2. The structure with 5 × 5 array of square parasitic patches is designed, fabricated, and tested. The measured voltage standing wave ratio (VSWR) is <2 over 5.725–5.875 GHz frequency band. The antenna with a single square patch provides a gain of 12.6 dB, whereas the antenna with 5 × 5 array of square parasitic patches provides a gain of 18.0 dB with 92% efficiency, SLL of −18.4 dB and front to back lobe ratio of more than 20 dB. The proposed structure can be packaged inside an application platform. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 733–739, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24156

High‐gain multilayer 2×2 antenna array for wireless applications

AbstractThis article proposes an efficient high‐gain multilayer 2×2 antenna array for wireless applications. The prototype antenna consists of a microstrip antenna which feeds 2×2 array of square parasitic patches fabricated on a low‐cost easily available FR4 superstrate. The patches on superstrate are suspended in air at λ0/2. The structure is designed, fabricated, and tested. The measured VSWR is < 2 over 5.725–5.875 GHz frequency band. The proposed antenna with 2×2 array of square parasitic patches provides 80% efficiency and SLL of −24 dB with an associated gain of 14.9 dB. The proposed structure can be packaged inside an application platform. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2911–2917, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23835