Abstract
Due to the rapid development of wireless communication systems, good numbers of services and devices use different frequency bands and protocols. To concurrently cover all these services, the antenna in communication devices should operate over multiple frequency bands. The use of wide and multi-band antennas not only reduces the number of antennas necessary to cover multiple frequency bands but also lessens the system complexity, size, and costs. To operate over eight frequency bands to cover sixteen well-established narrow service bands, a planar monopole antenna is proposed for portable communication devices. The proposed antenna is comprised of an inverted F-shaped monopole patch with a rotated L-shaped strip and an F-shaped ground strip with a rotated L-shaped branch. The studied antenna can excite at multiple resonant modes which helps it to achieve eight measured operating bands of 789–921 MHz, 1367–1651 MHz, 1995–2360 MHz, 2968–3374 MHz, 3546–3707, 4091–4405 MHz, 4519–5062 MHz and 5355–6000 MHz. The achieved measured operating bands can cover sixteen popular narrow service bands for 4G/3G/2G, MWT, WiFi, WiMAX, WLAN, and sub-6 GHz 5G wireless communication system. The studied antenna achieved good gain, efficiency and exhibits stable radiation characteristics. Moreover, the antenna does not use any lumped element and left ample space for other circuitries which makes it easier to use in portable devices such as tablets, laptops, etc. with low manufacturing cost.
Highlights
Due to the rapid development of wireless communication systems, good numbers of services and devices use different frequency bands and protocols
To simultaneously cover all these services, the antenna in portable communication devices should operate over multiple frequency bands
The antennas reported in Refs.[3,6,9,16] can cover seven service bands, but wireless medical telemetry (WMT), WiFi, WiMAX, WLAN, and 5G bands are not covered
Summary
Due to the rapid development of wireless communication systems, good numbers of services and devices use different frequency bands and protocols. The studied antenna consists of a T-shaped driven strip and a dual-branch parasitic ground strip and achieved dual impedance bands 690–970 MHz and 1680–2740 MHz. A compact multiband monopole antenna for WWAN/LTE mobile phones was proposed in Ref.[15]. With an overall size of 75 × 140 × 5.8 mm[3], the studied antenna attained five impedance bands of 681–991 MHz, 1626–2706 MHz, 3300–3813 MHz, 5136–5379 MHz, and 5622–6000 MHz. The designed antenna can operate over LTE700, GSM850, GSM900, DCS, PCS, UMTS, LTE2300, LTE2500, LTE3400 for 2G/3G/4G, 3.5 GHz for WiMAX and 5.2, 5.8 GHz bands for WLAN service bands, but the WMT, WiFi5.5, and 5G bands are not covered.
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