Performance restoration of dielectric embedded antennas using omega like complementary split ring resonators

Abstract

This research work addresses the performance deterioration challenges of dielectric embedded patch antenna. Antennas installed on the surface of high speed aerial vehicles are usually surrounded by dielectric coating to cater for the environmental effects like friction and humidity, the presence of dielectric in the surrounding encourages the propagation of strong surface waves causing the pattern deterioration and increase in return loss. The surface waves are suppressed in two stages first with the help of substrate integrated waveguide cavity created on the back of patch antenna to reduce the leakage currents. Secondly the remaining surface waves which propagate in the dielectric are suppressed by simply placing an array of modified complementary split ring resonator (CSRR) on the surface of surrounding dielectric. CSRR is known to offer band-gap characteristics thus it ensures complete blockage of the fundamental mode of surface waves without any additional fabrication complexity. The radiation pattern is restored and the return loss is reduced using the proposed techniques. The measured results from the fabricated prototype authenticate the proposed concept. Figure 1 SIW cavity backed antenna embedded in dielectric (a) Side view (b) Top view, the dimensions are L P 5 50 mm, W p 5 30.4 mm, h dc 5 12 mm, L dc 5 200 mm, W dc 5 200 mm, L sub 5 80 mm, W sub 5 50 mm, L SIW 5 67 mm, W SIW 5 44 mm, d 5 3 mm, p 5 5 mm. [Color figure can be viewed at wileyonlinelibrary.com]ABSTRACT: A K-band differential cross-coupled inductance-capacitance (LC) voltage-controlled oscillator (VCO) is implemented in 0.18lm CMOS process. To accomplish high quality (Q) factor LC-tank at Kband, a slab inductor with high Q is adopted. The VCO can be tuned from 23.1 to 23.38 GHz and the core dc power consumption is 11.33 mW from 1 V power supply. The phase noise is 2109.04 dBc/Hz at 1 MHz offset, and the calculated figure of merit (FoM) is 2185.79 dBc/ Hz. At low supply voltage mode of 0.65 V, the phase noise is 2106.015 dBc/Hz at 1 MHz offset and the FoM is 2189.76 dBc/Hz. V C 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 59:362-366, 2017; View this article online at wileyonlinelibrary.com.

Metamaterial inspired triband offset feed rectangular monopole for wireless applications

“…In the proposed final configuration, the OCSRR is engraved in rectangular radiating element, which creates the extra resonance at 3.16 GHz. From [29], the SRR resonant frequency is given by…”

“…The metamaterial [25] should satisfy the unit cell size of P<ʎg/4. SRR [26], Sshaped, CSRR [27][28][29][30][31][32], and ELC [33,34] are the different kinds of metamaterial structures widely used in the antenna design for impedance matching, size reduction bandwidth, gain, and directivity improvement.…”

Design of Metamaterial Antenna Based on the Mathematical Formulation of Patch Antenna for Wireless Application

“…Researchers are very interested in using metamaterials to improve antenna performance because of their distinctive electromagnetic activity. Some types of metamaterials include the split ring resonator (SRR) [18], omega-shaped [19], and complementary split ring resonator (CSRR) [20][21][22][23]. Tese materials are used to reduce size, improve bandwidth, and match impedance well.…”

Octa-Band Metamaterial Inspired Multiband Monopole Antenna for Wireless Application

“…Under such homogeneity conditions, these materials possess an excellent EM property that constructively disturbs the EM wave propagation and can be utilized for designing filters, couplers antennas, and devices used for communication [19][20][21][22][23]. Various classes of unit cells are based on split ring resonator [24], complementary split-ring resonator [26,27], omega-shaped [25], and spiral resonator [28].…”