Characteristic Mode Analysis of a Ka-Band CPW-Slot-Couple Fed Patch Antenna with Enhanced Bandwidth and Gain

Abstract

A Ka-band CPW-Slot-Couple (CSC) fed microstrip antenna with enhanced bandwidth and gain is presented in this paper. To simplify the feed network, the matching slots are designed at the end of the CPW. Consequently, the patch antenna is designed with a low profile, which has a size of 7.2 × 32.6 × 0.508 mm3. Characteristic mode analysis (CMA) is applied to illustrate the principle of the enhancement of the band with the form characteristic mode point of view. A slot based on inductive loading is employed on the parasitic patch to move the resonant frequency of CM3 to the resonant frequency of CM2 for enhanced bandwidth, which avoids introducing additional impedance matching networks. The measured results show that the bandwidth of the proposed monolayer antenna is 14.18% from 24.84 to 28.6 GHz and the peak gain is 7.9 dBi. Due to its attractive properties of low profile, compact configuration, wide band, and high gain, the proposed antenna could be applied to miniaturized millimeter-wave applications.

A Compact Millimeter-Wave Multilayer Patch Antenna Array Based on a Mixed CPW-Slot-Couple Feeding Network

“…Figure 3c shows the simulated and measured realized gain versus frequency. The measured peak gain is 7.9 dBi; the enhanced gain characteristics are thanks to the successful implementation of the nonuniform patch [17].…”

“…The driven antenna element characteristic mode analysis and design processes are presented in Ref. [17]. The antenna is composed of a nonuniform patch with a pair of coupling slots on a low-dielectric-constant high-frequency substrate (Rogers 5880, USA, Micromachines 2024, 15, 535 3 of 13 ROGERS Corporation, h = 0.508 mm, ε r = 2.2, tanδ = 0.0009), as shown in Figure 2a.…”

“…Figure 3c shows the simulated and measured realized gain versus frequency. The measured peak gain is 7.9 dBi; the enhanced gain characteristics are thanks to the successful implementation of the nonuniform patch [17]. The optimized parameters of the proposed antenna element were simulated in detail, and the final fabricated and measured results are shown in Figure 3.…”