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[Institution of Engineering and Technology 12th European Conference on Antennas and Propagation (EuCAP 2018) - London, UK (9-13 April 2018)] 12th European Conference on Antennas and Propagation (EuCAP 2018) - Compact L/S-Band Circularly Polarized Microstrip Antenna over Reactive Impedance Surface
摘要： A compact LIS-band circularly polarized (CP) antenna over the reactive impedance surface (RIS) is designed, fabricated, and measured. This dual-band CP antenna is excited by two probes and fed by two grounded coplanar waveguides. The CP radiation with very compact antenna size is achieved by stacking a square ring slotted truncated corner square patch and a truncated corner square patch over the RIS. The measured results show that the 3-dB axial ratio bandwidth of the antenna is 0.9% (1.787-1.803 GHz) for the lower band and 1.1% (2.685-2.715 GHz) for the upper band, while the 10-dB return loss bandwidth is 5.9% (1.746-1.852 GHz) and 7.3% (2.586-2.784 GHz), respectively. The antenna gain at boresight is 1.9 dBic for the lower band, and 1.94 dBic for the upper band. The overall volume of the dual-band CP antenna is 0.235 x 0.235 x 0.042λ at 1.765 GHz.
关键词： reactive impedance surface,circularly polarized antenna,size miniaturization,dual band
更新于2025-09-23 15:22:29
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Compact Equal-Width Equal-Length Phase Shifter With Slow-Wave Half-Mode Substrate Integrated Waveguide for 5G Applications
摘要： The emerging fifth-generation (5G) wireless and mobile communications demand high-performance phase shifters to enable the multi-channel transmit/receive systems with phase control ability. In this work, a size-miniaturized wideband phase shifter based on slow-wave half-mode substrate integrated waveguide (SW-HMSIW) is presented. The proposed SW-HMSIW is consisting of conventional HMSIW section and periodically-patterned non-uniform microtrip polyline unit cells. Patterning polyline unit cells in HMSIW can effectively enhance the product of the equivalent permittivity and permeability of SW-HMSIW, so that the slow-wave effect can be exhibited and its associated size reduction will be further achieved. Moreover, lengths and widths of segments of the proposed polyline unit cell can influence the equivalent permittivity and permeability of the SW-HMSIW, and consequently change its phase constant and cutoff frequency. Hence, for a SW-HMSIW with a fixed physical length, an electrical length variation, i.e, phase shift, can be achieved as segments of the polyline employ various lengths or widths. Based on this principle, a wideband equal-width equal-length SW-HMSIW phase shifter is implemented. Measured results are in good agreement with simulated ones, with a phase shift of 90.5 ± 3 degree and a fractional bandwidth of 43.0% achieved. Compared with some similar reported works, the proposed one shows a size reduction more than 80% as well as good magnitude and phase deviations performance. Moreover, its miniaturized size and equal-width equal-length structure make it suitable for the complex multi-channel modules and networks of the 5G applications.
关键词： slow-wave structure,phase shifter,Effective medium approximation,size miniaturization,half-mode substrate integrated waveguide (HMSIW)
更新于2025-09-16 10:30:52