Design Methodology of Multiband Printed Antennas for Future Generations of Mobile Handsets

Abstract

The present paper introduces a design methodology to extend the operation of a microstrip patch antenna to operate efficiently at multiple higher-order resonances. This method depends on the geometrical modification of the antenna structure by adding well-designed inductively-loaded and capacitively-coupled elements to the primary patch so that it can efficiently radiate at the desired higher frequency bands. It is explained quantitatively how to use the geometrical parameters of the inductively and capacitively coupled elements for accurate tuning of the multiple resonant frequencies of the antenna. The proposed method is applied to modify a primary hexagonal patch antenna (designed to principally radiate at 28 GHz as its first-order resonance) so as to operate at additional higher frequency bands around 43, 52, and 57 GHz. Also, an alternative design is provided for a quad-band printed antenna of composite patch structure that operates in the same millimetric-wave (mm-wave) bands, 28, 43, 52, and 57 GHz with high radiation efficiency, excellent impedance matching, and satisfactory values of the antenna gain. The corresponding frequency bands are, respectively, (27.7-28.3 GHz), (42.7-43.3 GHz), (51.2-53.0 GHz), and (55.7-57.5 GHz). The dimensions of the area occupied by the primary patch and the parasitic elements are 5.2 × 3.3 mm . The two antennas are fabricated for experimental assessment of their performance including the impedance matching and radiation patterns. It is shown that the experimental measurements come in agreement with the simulation results over all the four operational mm-wave frequency bands. One of the advantages of the proposed method is that it can be applied to patch antennas of arbitrary shapes and is not restricted to hexagonal patch antennas. Furthermore, this method is not restricted by extending the operation of the antenna to radiate at four frequency bands. It is capable of adding any desired number of frequency bands so that the antenna can operate at five or, even, more bands.INDEX TERMS MIMO, multi-band antenna, Patch antenna, 5G mobile communications

Ultra-wide Band Antenna on Flexible Substrate for Future Wireless Communications

“…The most commonly used method to increase the bandwidth of such resonant microstrip patch antennas is to use a defected ground structure (DGS) that effectively increases the aperture size of the resonant cavity and, hence, increases the bandwidth. Also, a recently published work [7] has shown that loading the main radiator (patch) with capacitively coupled elements has the effect of enhancing the bandwidth and/or adding extra resonances to the radiating modes of the microstrip patch structures. It has been shown that using both techniques (partial removal of the ground plane and capacitive loading of the main patch with parasitic elements) [8] may result in adding more resonant frequency bands, and at the same time, improving the bandwidth of some of these radiating modes.…”

A Triband Slot Antenna Loaded with Asymmetric Split Ring Resonator for Wireless Applications

“…A resonator loaded patch antenna is designed in [10], a high performance air filled multi-mode resonant u slot antenna in [11], and a shared aperture antenna for base station application in [12] is proposed to obtain multiple bands. A design methodology is discussed to obtain multibands in printed antennas [13] and multiband monopole antenna with enhancement in bandwidth [14] for mobile handset application. In the above techniques, to obtain multiple bands much effort is needed in terms of design, feeding method, and optimization due to the sensitivity of parameters, and it is incapable to tune frequency bands independently.…”

Development of Two UWB Multiband MIMO Antennas with Enhanced Isolation and Cross-Correlation

“…In order to promote isolation, a decoupling structure is built that isolates the input of the radiating patches from the corresponding network arrangement in [8][9][10][11][12]. To increase the isolation between the patches, parasitic components are utilized in [13][14][15][16][17][18]. Using the literature mentioned above, it is necessary to create a MIMO antenna that operates on a multiband application with an ultra-wide bandwidth, improved TARC, and better cross correlation.…”