Slot-Loaded Microstrip Antenna: A Possible Solution for Wide Banding and Attaining Low Cross-Polarization
A simple and single element slot-loaded rectangular microstrip antenna has been proposed for broad impedance bandwidth and improved cross-polarized (XP) radiation compared to maximum copolarized (CP) gain without affecting the copolarized radiation patter
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Abstract A simple and single element slot-loaded rectangular microstrip antenna has been proposed for broad impedance bandwidth and improved cross-polarized (XP) radiation compared to maximum copolarized (CP) gain without affecting the copolarized radiation pattern. Around 19 dB isolation between CP and XP along with 22% impedance bandwidth is achieved with the proposed structure. The present investigation provides an understanding of simultaneous improvement in impedance bandwidth and the XP radiation characteristics with the present structure. Keywords Bandwidth microstrip antenna
Cross-polarization
Patch reactance
Slot-loaded
1 Introduction At the present scenario, most of the wireless communication devices are budding towards tininess and multifunctionality, where rectangular microstrip antenna (RMA) is a good candidate. However, this conventional RMA suffers from some severe disadvantages such as narrow impedance bandwidth and poor polarization purity particularly in its H-plane. The impedance bandwidth of the conventional RMA produces 2–4% bandwidth only [1, 2]. These antennas radiate linearly polarized wave along the broadside of the element called copolarized radiation G. Abhijyoti S.L. Lolit Kumar C. Sudipta (&) Department of Electronics and Communication Engineering, Mizoram University, Aizawl 796004, Mizoram, India e-mail: [email protected] C. Subhradeep G.K. Sanjay MWT Division, CSIR-CEERI, Pilani 333031, Rajasthan, India B. Banani Department of Electronics and Communication Engineering, NIT-Silchar, Silchar 788010, Assam, India © Springer Nature Singapore Pte Ltd. 2017 S. Patnaik and F. Popentiu-Vladicescu (eds.), Recent Developments in Intelligent Computing, Communication and Devices, Advances in Intelligent Systems and Computing 555, DOI 10.1007/978-981-10-3779-5_14
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Fig. 1 Schematic representation of the top view of the proposed structure
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(CP). However, few degree of orthogonally polarized, called cross-polarized (XP), radiation takes place along with the CP radiation. Therefore, such RMA suffers from poor polarization purity (less CP–XP isolation), and it is around 10 dB when operates in X band frequency. This is evidently a restriction to the several wireless applications. Some investigations were reported in [3, 4], where the modifications of conventional patch structure have been employed for the reduction in XP radiation only. Around 16 dB of CP–XP isolation with no improvement in impedance bandwidth is found in those. Two recent investigations [5, 6] show around 23 dB of CP–XP isolation with simple slot and folded-type DGS structure with only 5 and 11% of impedance bandwidth. The employment of shorted patch to reduce XP radiation is a new technique and is reported presently in [7, 8]. More than 25 dB of CP–XP isolation is revealed in [7] with poor impedance bandwidth of only 5%. On the contrary, [8] show some degree of improvement in the bandwidth (around 10.5%; 1.32 GHz at 12.8 GHz) with around 24 dB of CP–XP isola
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