A palm‐sized antenna is proposed for the hybridisation of fifth generation (5G) and long‐term evolution‐advanced (LTE‐A) communication modes. The antenna has the overall volume of 70 mm (l) × 40 mm (w) × 0.254 mm (h) clutched by four multiple‐input–multiple‐output chip antennas (CAs) operating at 2.4 GHz for LTE‐A on the sides of a flat substrate integrated waveguide (SIW) four‐by‐four Butler matrix (BM) beamforming antenna operating over the band from 27 to 29 GHz for 5G communication. Advantages are the broad bandwidth gained by a low‐profile BM and this metal SIW structure of high isolation above 10 dB with neighbouring CAs, which is impossible for the microstrip BM and coplanar waveguide (CPW) version. The simulated and measured results of the impedance matching as well as the gains and radiated field patterns of all the ports reveal the antenna is proper for the multi‐mode communication as a compact geometry. Besides, high isolation between the closely placed radiating elements is observed.
In this paper, a new design method is proposed for a planar and compact dual-band dipole antenna. The dipole antenna has arms as a hybrid CRLH (Composite right- and left-handed) transmission-line comprising distributed and lumped elements for the dual-band function. The two arms are fed by the outputs of a compact and printed CRLH dual-band balun which consists of a CRLH hybrid coupler and an additional CRLH phase-shifter. Its operational frequencies are 2.4 and 5.2 GHz as popular mobile applications. Verifying the method, the circuit approach, EM (Electromagnetics) simulation and measurement are conducted and their results turn out to agree well with each other. Additionally, the CRLH property is shown with the dispersion diagram and the effective size-reduction is mentioned.
In this paper, a new small antenna is suggested for 5G Sub-6-GHz band mobile communication. It can change the channel among the three given bands (called the 3.5-GHz area), as a wide-band antenna is connected to a small multiplexer comprising three metamaterial channel filters. The function of channel selection of this antenna system is experimentally demonstrated to prove the validity of the presented scheme. The channel selection for 5G mobile communication is conducted from f1 (channel 1) through f2 (channel 2) to f3 (channel 3), when TX and RX antennas with gains over 0 dBi and S11 less than −10 dB are located far-field apart (RFar ≫ 2.1 cm), and result in the transmission coefficient (S21) being the greatest at the selected channel, which is detected by a vector network analyzer.
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