Multiband Antennas for LTE Femtocells

Compact dual and triple band antennas for 5G-IOT applications

International Journal of Microwave and Wireless Technologies ◽

10.1017/s1759078721000301 ◽

2021 ◽

pp. 1-8

Author(s):

Ruchi ◽

Amalendu Patnaik ◽

M. V. Kartikeyan

Keyword(s):

Microwave Frequency ◽

Mobile Internet ◽

Dual Band ◽

Impedance Bandwidth ◽

Printed Antenna ◽

Iot Applications ◽

Multiband Antennas ◽

New Radio ◽

Compact Size ◽

Triple Band

Abstract Designing miniaturized multiband antennas to cover both the 5G new radio frequencies (FR1 and FR2) simultaneously is a challenge for wireless communication researchers. This paper presents two antenna designs : a dual-band printed antenna of size 18 × 16 × 0.285 mm3 operating at FR1–5.8 GHz and FR2–28 GHz and a triple-band printed antenna with dimensions 30 × 25 × 0.543 mm3 operating at FR1–3.5 GHz and 5.8 GHz (sub-6 GHz microwave frequency bands) and FR2–28 GHz (mm-wave frequency band). The final projected triple-band antenna has a compact size with an impedance bandwidth of 12.71%, 11.32%, and 18.3% at 3.5 GHz, 5.8 GHz, and 28 GHz, respectively with the corresponding gain of 1.86 dB, 2.55 dB, and 4.41 dB. The measured radiation characteristics of the fabricated prototypes show that the proposed designs are suitable for trendy 5G-RFID and mobile Internet of things (IoT) applications.

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FSS-based triplate antenna design concept for wireless devices

International Journal of Microwave and Wireless Technologies ◽

10.1017/s1759078721000623 ◽

2021 ◽

pp. 1-10

Author(s):

Ashwini Kotrashetti ◽

B. K Lande ◽

Ajay Poddar

Keyword(s):

Design Methodology ◽

Design Concept ◽

Strong Interactions ◽

Proof Of Concept ◽

Wireless Devices ◽

Multiple Frequency ◽

Modeling And Analysis ◽

Multiband Antennas ◽

Mode Behavior ◽

Radiating Element

Abstract Conventional multiband antennas suffer from strong interactions among different operating frequencies, complex configurations, low bandwidth, and reduced efficiencies. A design concept for a multibeam multiband antenna in wireless devices is proposed in this paper. The design concept provides a promising approach to augment transmission and reception. The principle of design involves a primary radiating element embedded in a triplate conformation which excites a passive array of multiple frequency secondary radiators, forming a frequency selective structure in triplate (FSST). The higher order mode behavior of the parent antenna characterizes the design of FSST placed in its nearfield. The mathematical modeling and analysis of the design methodology is also presented. As proof of concept, the proposed design methodology is validated with simulations and experiments at four unlicensed communication bands and the results are compared.

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