No abstract

Abstract-In this paper, a single notched band at 5.2 GHz with complementary split ring resonator (CSRR) ultra-wideband (UWB) antenna and its implementation in designing of two-element multipleinput multiple-output (MIMO) with high and uniform isolation are experimentally demonstrated. The proposed UWB MIMO consists of a T-shaped stub in ground plane in between antenna elements of the size of λ at3.1 GHz /4 to achieve minimum 20 dB isolation, which is almost uniform in entire UWB band. The size of the UWB MIMO antenna is 0.31λ at3.1 GHz × 0.434λ at3.1 GHz × 0.008λ at3.1 GHz mm 3 , and it is printed on an RT/duroid 5880 substrate (ε r = 2.2, tan δ = 0.0009), which leads to good gain and high total efficiency of the antenna in operating bands. The simulated and measured results show good agreement for the impedance bandwidth (|S 11 | < −10 dB) and isolation (|S 21 | < −20 dB) in most of the operating band, excluding the notched band at 5.2 GHz in UWB range. The simulated, measured and calculated MIMO antenna diversity parameters prove that the antenna is suitable for UWB MIMO systems.

In this paper, a new way of obtaining a band rejection in a ultra wideband (UWB) filter using a uniplanar Electromagnetic bandgap (EBG) structure is reported. The EBG structure has a bandgap centered at 6.69 GHz which is almost 38% lower compared with the conventional uniplanar EBG of same dimensions. A one-dimensional EBG structure coupled with a microstrip line provides a narrow bandgap, which is used in obtaining a notch in the UWB filter. Single notch UWB filters with variations in the placement of EBG are fabricated producing a notch centered at 5.19 GHz (wireless local area network (WLAN)). A dual notch (5.16 and 8.24 GHz (satellite communication)) UWB filter is also fabricated with two different unit cell EBGs'. Switchable and tunable notch band UWB filters are proposed.

No abstract

A co-planar waveguide fed slot antenna element with 34% impedance bandwidth and 2-3 dBi broadside gain is proposed. The corner bent topology of the element is investigated for reduced physical footprint and easier integration with the mobile terminals operating in the 28-GHz band. The front-to-back ratio of the corner bent antenna is 1 dB in the xy plane, which indicates a high specific absorption rate. A compact wideband reflector is proposed which has transmission of less than −25 dB and a linear phase ±90 • in the 27-33-GHz bandwidth. The wideband reflector is integrated with the corner bent antenna at 0.135λ offset from the radiating aperture. The corner bent antenna integrated with the reflector operates in the 27-33-GHz band, with a front-to-back ratio of more than 14 dB across the band and a forward gain of 6-7.2 dBi. The radiation patterns are stable for 20% bandwidth. The simulated and measured results are presented. INDEX TERMS CPW fed antenna, 28 GHz corner bent antenna, 5G mobile terminal, wideband.