Abstract
A compact-sized planar super-wideband (SWB) monopole antenna with four notched bands is presented in this paper. The antenna consists of a rectangular ground plane and a circular radiator that is fed by a tapered microstrip feed line. The overall size of the antenna is 18 mm × 12 mm × 0.5 mm, and its impedance bandwidth (S11 ≤ −10 dB) ranges from 2.5 GHz to 40 GHz (bandwidth ratio of 16:1). Four notched bands are obtained using two inverted U-shaped slots, a split-ring resonator (SRR), and a meandered slot. The notched frequency bands can be adjustable by changing the parameters of parasitic slot elements, and the realized notched bands in this paper are Wi-MAX band (3.5 GHz), WLAN band (5.5 GHz), satellite communication X-band (7.5 GHz), and amateur radio band (10.5 GHz). The simulated and experimental results show good agreement with each other. The antenna possesses a high gain, super-wide impedance bandwidth, and omni-directional radiation patterns.
Highlights
Ultra-wideband (UWB) systems have attracted the attention of researchers, due to their high data transmission rate and low power consumption [1,2]
According to the regulations defined by the Federal Communications Commission (FCC), a frequency range of 3.1–10.6 GHz was allocated for UWB systems [3]
A tapered microstrip line-fed SWB monopole antenna was designed in Reference [21], where a rectangular slit was introduced in the patch to reject the wireless local area network (WLAN) band
Summary
Ultra-wideband (UWB) systems have attracted the attention of researchers, due to their high data transmission rate and low power consumption [1,2]. In Reference [16], a microstrip line-fed asymmetrical rectangular patch antenna loaded with U-slots and triangular slits was reported with a bandwidth ratio of 13.5:1. A tapered microstrip line-fed SWB monopole antenna was designed in Reference [21], where a rectangular slit was introduced in the patch to reject the WLAN band. A dual band-notched SWB antenna was presented in Reference [23], where a U-shaped parasitic element, a T-shaped stub, and a U-shaped slot were introduced in the ground plane and the radiating patch to notch Wi-MAX and satellite communication-based X-band. The antenna offers high gain, super-wide bandwidth, and omni-directional radiation characteristics It covers various modern communication application bands and can be used for spectrum sensing in cognitive radio systems
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