Open AccessFrequency‐reconfigurable multiple‐input–multiple‐output monopole antenna with wide‐continuous tuning range
Author(s) -
Cao Yunfei,
Cheung Sing Wai,
Yuk Tung Ip
Publication year - 2016
Publication title -
iet microwaves, antennas and propagation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.555
H-Index - 69
eISSN - 1751-8733
pISSN - 1751-8725
DOI - 10.1049/iet-map.2015.0295
Subject(s) - monopole antenna , antenna (radio) , pin diode , frequency band , envelope (radar) , physics , electrical length , diode , magnetic monopole , mimo , electronic engineering , electrical engineering , radiation pattern , acoustics , antenna efficiency , optoelectronics , engineering , telecommunications , channel (broadcasting) , radar , quantum mechanics
The design of a frequency‐reconfigurable (FR) multiple‐input–multiple‐output (MIMO) monopole antenna with a wide‐continuous tuning range in handheld devices is presented. The antenna consists of two symmetrical FR monopole elements and a FR defected‐ground structure (DGS). The monopole elements have two sections, sections 1 and 2, connected together using a PIN diode. Section 1 alone generates a high‐frequency band at 2.26 GHz. By turning ON the PIN diode, sections 1 and 2 will be connected together to generate a low‐frequency band at 1.93 GHz. The DGS is used to achieve high isolation between the monopole elements and reconfigurable to follow the low‐ or high‐frequency operations. Simple and novel biasing circuits employing only 3 DC wires are designed to control these diodes. The methodology of using the design in other frequency bands is proposed. Results on S‐parameters, radiation pattern, realized peak gain and envelope‐correlation coefficient (ECC) are presented. Measured results show that the antenna has a wide‐frequency tuning range from 1.88 to 2.64 GHz, covering the long‐term‐resolution (LTE) 1, 2, 23, 25, 33–37 and 39–40 bands with low mutual coupling and ECC of less than −20 dB and 0.5, respectively. The effects of the feeding cable used in measurement are studied.