
Compact dual‐band dual‐mode microstrip‐fed dipole‐loop antennas for pattern diversity arrays
Author(s) -
Sarkar D.,
Srivastava K.V.
Publication year - 2017
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
eISSN - 1350-911X
pISSN - 0013-5194
DOI - 10.1049/el.2017.0593
Subject(s) - multi band device , microstrip , optics , physics , dipole antenna , hfss , microstrip antenna , optoelectronics , materials science , antenna (radio) , telecommunications , computer science
In this Letter, a compact dual‐band dual‐mode microstrip‐fed dipole‐loop (MDL) element is proposed, which consists of a rectangular loop‐structure embedded in the feed‐line of a printed dipole. This MDL element exhibits an additional one‐wavelength loop resonance at a lower frequency (1.55 GHz) with omnidirectional pattern, along with the conventional reflector‐backed half‐wavelength dipole mode (2.55 GHz) having end‐fire radiation. Thus, electrical size reduction and dual‐band frequency‐dependent pattern diversity characteristics are obtained simultaneously in the MDL element. Furthermore, the proposed MDL element is used to construct a 1 × 2 array which operates at 1.45 and 2.59 GHz with impedance bandwidths of 14.33 and 12.92%, respectively. Bi‐directional broadside radiation (peak gain of 4.42 dBi) is achieved at the lower band, whereas the higher band exhibits high‐gain end‐fire radiation with peak gain of 7.46 dBi. The proposed design concepts are validated by Ansys HFSS simulations as well as measurements carried out on fabricated array prototypes.