Stub loaded, low profile UWB antenna with independently controllable notch‐bands

Abstract

The design and realization of a compact coplanar waveguide (CPW) fed ultrawideband (UWB) antenna having dual‐notched bands is presented in this article. The antenna possesses on demand notch bands at 4 to 5.78 GHz and 6.83 to 8.22 GHz. The presented design consists of a single iterated octagonal patch antenna designed on cheap FR4 substrate. The stub is utilized to achieve a wide impedance matching of 7.33 GHz (3.2‐10.5 GHz), while the notch‐bands are realized using split ring circular slots. These notch‐bands are controlled independently without affecting the overall performance of the antenna. Simulated and measured results showed that the antenna offers excellent performance with an overall size of 20 × 23 mm2, high efficiency of more than 90%, and a nearly omnidirectional maximum gain of 4.8 dBi. The performance of the proposed antenna is better than the antennas presented in the literature in term of size, stable gain, and independently controllable notch bands. Besides these advantages, the compact size allows the antenna to integrate into small devices easily and help manufacturers to produce a massive number of antennas comfortably.

A Compact Flexible Frequency Reconfigurable Antenna for Heterogeneous Applications

“…Next, the rectangular stub having dimension Sx × Sy is placed between the feed line and the circular radiator to enhance the narrow bandwidth of the antenna. The enhancement in the bandwidth is observed due to the introduction of extra reactive load by the stub which significantly improved matching between feedline and radiator over wide bandwidth [8] Subsequently, a semicircular slot having an internal gap of G4 is inserted in the radiator. The insertion of this slot resulted in the mitigation of a wide band spectrum (2.9-7.7 GHz) from the operating region.…”

“…In addition, the proximity of the antenna to human tissue imposes other VOLUME XX, 2020 1 constraints such as gain reduction and the disruption of the antenna impedance matching [6][7]. Other than the reconfiguration and flexibility characteristics, the antenna compactness is highly appreciated as the miniaturized antennas significantly reduce the size of electronic systems [8]. Therefore, the combination of flexibility with compactness makes the antennas preferable for modern communication systems and devices [9].…”

A Wide and Tri-band Flexible Antennas with Independently Controllable Notch Bands for Sub-6-GHz Communication System

“…Although the antenna has a compact size of 27 mm × 32 mm with good performance, still it lags in covering complete 5G sub-6-GHzband allocated globally. In literature researchers adopted different techniques including fractal geometries [23], insertion of stubs [24], [25], and so on to achieve wideband. Therefore, to further enhance the bandwidth of the antenna a rectangular stub was introduced at the bottom of patch.…”

“…Therefore, to avoid unwanted interference of 5G communication with other sub-bands, we introduce notch band in the antenna. Slots are widely used to achieve notch bands in wide-band antennas, although the placement of the slots at the right position is the biggest challenge for the researchers [24]. Thus, a judicious analysis was carried out in order to identify the correct position of the slot.…”

“…Since the past decade, on-demand frequency switchable antennas with independently controllable notch bands gain considerable attention due to ease of controlling notch bands according to user requirements [24]. The flexible antennas having the functionality of independently con-trollable notch bands are suitable for modern flexible devices.…”