In this study, a compact crescent‐shaped microstrip patch antenna is proposed for super wideband (SWB) applications. The antenna consists of a rectangular, slotted partial ground plane and a crescent shape radiating patch to cover wider frequency band than the ultrawideband. The proposed antenna is fabricated on an FR4 substrate and is fed with a 50 Ω microstrip feed line. The substrate has a thickness of 1.60 mm with the relative permittivity of 4.4, and a dielectric loss tangent of 0.02. The proposed antenna has a compact size of 32 mm × 22 mm with the electrical dimension of 0.27λ × 0.18λ. The simulated results agree with the measured results. The result shows that the proposed antenna achieves reflection coefficient less than −10 dB (VSWR < 2) from 2.5 GHz to 29.0 GHz that is a 168.25% fractional bandwidth with 11.6:1 bandwidth ratio. The proposed antenna achieves the durable omnidirectional radiation pattern throughout the operating band with 6.10 dBi of maximum gain. The bandwidth dimension ratio of the presented antenna is 3462.02. As the antenna shows the SWB characteristics, it can be used in the high fidelity short pulse applications. The proposed antenna can be used in S, C, X, Ku, K, ISM, Wi‐Fi, WLAN, WiMAX, and MVDDS wireless communication systems.
A resonator based metamaterial for sensor application is studied in this paper. The resonator is encompassed by a partial ground plane and excited by a microstrip feed‐line. As the resonator, partial ground frame, and the feeding transmission line are on the same microstrip, the measurement can be executed by using the common laboratory facility instead of using the waveguide. The proposed metamaterial occupies a compact size of 20 × 20 mm2 and is imprinted on a low‐cost FR4 substrate. The substrate has a relative permittivity of 4.6 with a dielectric loss tangent of 0.02. The resonator and the ground frame are placed on the similar part of the substrate and the feed‐line is placed on the other part of the substrate. In metamaterial design, normally arrays of metamaterial unit cells are needed, whereas this study presents only one cell, which can achieve the metamaterial properties. The characteristic parameters are fetched and analyzed to find the concurrency between the simulated and measured results. The presented metamaterial is applied in sensor applications where the simulated and measured results reveal considerable agreement.
A new efficient, comprehensive, and compact breast phantom measurement scheme with microstrip patch antenna is presented. The radiating element of the antenna is modified by cutting slots in both patch and ground plane for enhancing the electrical length and achieving omnidirectional radiation pattern with high gain. This methodology increases the operating frequency and as well as gain and efficiency without affecting the dimension of the antenna. The overall dimension of the antenna is 23 mm × 21 mm. The fractional bandwidth of the antenna is near about 117% (3.1–12 GHz) for −10 dB return loss with omnidirectional radiation pattern. The result shows that the average gain is 4.7 dBi with a maximum of 6.2 dBi and maximum efficiency of 98% over the operating bandwidth. The proposed prototype is simulated, fabricated, and measured, and simulated results are properly analyzed. The fidelity factor for 2 scenario of face to face and side by side also observed. Various parameters of the antenna are studied on breast phantom model with tumor sample for validating the antennas performance on breast phantom measurement. A simulation model is proposed where the antennas act as a transceiver in breast phantom measurement system for detecting undesirable tumor cells interior to the breast.
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