Abstract
In this paper, we propose a compact four-port coplanar antenna for cognitive radio applications. The proposed antenna consists of a coplanar waveguide (CPW)-fed ultra-wideband (UWB) antenna and three inner rectangular loop antennas. The dimensions of the proposed antenna are 42 mm × 50 mm × 0.8 mm. The UWB antenna is used for spectrum sensing and fully covers the UWB spectrum of 3.1–10.6 GHz. The three loop antennas cover the UWB frequency band partially for communication purposes. The first loop antenna for the low frequency range operates from 2.96 GHz to 5.38 GHz. The second loop antenna is in charge of the mid band from 5.31 GHz to 8.62 GHz. The third antenna operates from 8.48 GHz to 11.02 GHz, which is the high-frequency range. A high isolation level (greater than 17.3 dB) is realized among the UWB antenna and three loop antennas without applying any additional decoupling structures. The realized gains of the UWB antenna and three loop antennas are greater than 2.7 dBi and 1.38 dBi, respectively.
Highlights
The rapid development of wireless technologies and new communication services requires a large amount of frequency availability
This paper proposes a compact four-port coplanar antenna with a coplanar waveguide (CPW)-fed wide slot UWB antenna and three broadband loop-type ground radiation antennas for Cognitive radio (CR)
Considering the space required for the narrow band (NB) antennas, the ground dimensions are designed as 42 mm × 50 mm (0.88 λ g × 1 λ g at 3 GHz)
Summary
The rapid development of wireless technologies and new communication services requires a large amount of frequency availability. We choose to use a CPW-fed wide-slot UWB antenna for easy integration with three NB ground radiation antennas [14,15] on a single ground plane and to achieve good isolation characteristics. It is desirable to design a UWB antenna considering a compact ground size and isolation problems. To overcome these drawbacks, this paper proposes a compact four-port coplanar antenna with a CPW-fed wide slot UWB antenna and three broadband loop-type ground radiation antennas for CR applications. This paper proposes a compact four-port coplanar antenna with a CPW-fed wide slot UWB antenna and three broadband loop-type ground radiation antennas for CR applications This antenna is based on an excitation switching reconfigurable mechanism. This results in a fundamentally orthogonal design [27,28,29,30,31] (orthogonal characteristic mode)
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