Abstract
In this paper, a compact multiband printed antenna is proposed to cover four resonant bands in the range of 1-6 GHz. The antenna structure is inspired from that of the classical multi-cavity magnetron resonator. The antenna comprises a slot annular ring structure in the ground plane of an Isola FR4 substrate having Ԑr = 3.5 and thickness h=1.5 mm. The outer circle of the annular ring is loaded with radial arranged small circular slots. On the opposite side of the substrate, the antenna is fed with a 50-Ohm microstrip line. To investigate the effect of different antenna elements on the antenna performance, a parametric study is conducted. The antenna is simulated, fabricated, and measured. The simulated 10 dB return loss bandwidths for the four resonant bands are 35% (1.53–2.11GHz), 14% (2.9–3.34GHz), 12% (4.2–4.75GHz), and 9% (4.94–5.39GHz), respectively. Thus, the antenna is a proper candidate for many in use bands of wireless systems (1.65, 3.14, 4.44, 5.24 GHz), including LTE-FDD, GNSS, GSM-450, W-CDMA/HSPA/k, 802.11a, and IEEE 802.11ac WLAN. The results indicate that the designed antenna has quad-band resonant responses with substantial frequency ratios of f4/f3, f3/f2 and f2/f1. Besides, the antenna offers reasonable radiation characteristics with a gain of 2.5, 4.0, 6.2, and 4.2 dBi, throughout the four resonant bands.
Highlights
Many wireless communication applications are recently becoming available below 6 GHz, and some of which with multiple frequencies are billed for the growth of high-speed mobile telecommunication systems
The proposed slot antenna with quad-band characteristics is fed with a microstrip line in the top layer, while the ground plane is composed of slotted annular rings loaded with ten outer circles
An annular ring magnetron-like printed slot antenna is introduced for use in multiband wireless communication operating at 1.65, 3.14, 4.44, and 5.24 GHz
Summary
Many wireless communication applications are recently becoming available below 6 GHz, and some of which with multiple frequencies are billed for the growth of high-speed mobile telecommunication systems For this reason, researchers are inspired to design compacted and multiband antennas [1]. The slot structure is obtained by introducing inverted Ω- and L-shaped slots in the partial ground plane, rather than using the conventional microstrip patch antenna as a radiating element. A low profile microstrip slot antenna is proposed to be used in multiband wireless communication systems covering a band ranging from one to six GHz. The antenna structure suggested is in the form of ring slot geometry loaded with ten small circular cavities on its outer circumference in the ground plane. A parametric study is conducted on many parameters of the antenna structure to show the flexibility of tuning the antenna within these bands
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