Isolation enhancement of planar disc antenna and ground plane in UWB applications

Abstract

A technique is proposed to mitigate the unwanted effect of ground plane currents when an antenna is mounted on a printed circuit board (PCB). To demonstrate the concept a CPW fed monopole is integrated onto a relatively large PCB. In the first stage of integration, a microstrip to grounded CPW feedline is incorporated to avoid connecting the PCB and antenna ground directly. To reduce the flow of current onto the edges of the PCB, two pairs of quarter-wavelength stubs are then utilised. A prototype is manufactured and examined. To show how this method enhances the radiation characteristics, the radiation patterns of the antenna in both an isolated and an integrated scenario with and without stubs are compared.Introduction: Since the FCC has allowed licence-free usage of the spectrum from 3.1-10.6 GHz for low power short impulse ultra-wideband (UWB) applications [1], planar monopole antennas have been much studied in the literature [2][3][4]. They are low profile, light in weight, cost-effective and easy to manufacture and have wide impedance bandwidth and stable radiation characteristics. However, when mounted on a printed circuit board (PCB), their radiation characteristics degrade owing to the coupling between the antenna and the PCB. The current flowing onto the edge of the PCB contributes to the radiation and deteriorates the radiation patterns.In this Letter, the isolation between the antenna and the PCB is addressed. A CPW fed monopole antenna is integrated into a relatively large PCB to demonstrate the concept. Two pairs of quarter-wavelength microstrip stubs are utilised to reduce the flow of current onto the PCB edge. The proposed technique is examined for the European UWB mask, which is partly focused on the frequencies between 6-8.5 GHz [5]. However, the technique can also be used for a wider frequency range. A prototype of the antenna is fabricated and examined. Details of the proposed strategy together with the simulated and measured results are presented.

Design, Investigation and Measurement of A Compact Ultra Wideband Antenna for Portable Applications

“…The total dimension of the UWB antenna is optimized to a compact size of 20 × 24.5 mm 2 , which is smaller than other existing antennas of the literature [20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][38][39][40][41][42] and is suitable for the applications in portable devices. In order to achieve the wideband operations and performance investigation of the proposed antenna configurations a fullwave, method-of-moment (MoM) code based commercially available electromagnetic simulator Zeland IE3D version 12 is used.…”

“…A CPWfed antenna not only attains a broad bandwidth, but also develops a smaller mutual coupling between adjacent lines [19,20]. However, the existing CPW-fed antennas are not suitable for portable UWB applications due to their big profiles [20][21][22][23][24][25][26][27][28][29][30]36]. Therefore, a wide field of research exists for the development of compact antennas with ultra wide bandwidth.…”

A miniaturized ultra‐wideband planar monopole antenna with L‐shaped ground plane stubs

“…The radiators of the planar monopole antennas have different shapes. The rectangular, elliptical, and circular patches were used as radiators to obtain UWB performance . Slot antennas were also used to realize UWB planar antennas .…”

Compact design of stair shape patch for short range and lower 5G systems

“…Several monopole antennas that cover such bands have been proposed previously (Huawei, 2018;Ren and Chang, 2006;Kim and Jee, 2007;Abbosh and Bialkowski, 2008;Ebrahimi et al, 2010;Xu et al, 2013;FCC, 2002). The majority of these ultra wide band designs have some key shortages in the performance.…”