Abstract

This paper presents a novel design of a modified ultrawideband (UWB) antenna array integrated with a multimode resonator bandpass filter. First, a single UWB antenna is modified and studied, using a P-shape radiated patch instead of a full elliptical patch, for wide impedance bandwidth and high realized gain. Then, a two-element UWB antenna array is developed based on this modified UWB antenna with an inter-element spacing of 0.35 λL, in which λL is the free space wavelength at the lower UWB band edge of 3.1 GHz, compared to 0.27 λL of a reference UWB antenna array designed using a traditional elliptical patch shape. The partial ground plane is designed with a trapezoidal angle to enhance matching throughout the UWB frequency range. The mutual coupling reduction of a modified UWB antenna array enhances the reflection coefficient, bandwidth, and realized gain, maintaining the same size of 1.08 λ0 × 1.08 λ0 × 0.035 λ0 at 6.5 GHz center frequency as that of the reference UWB antenna array. The UWB antenna array performance is investigated at different inter-element spacing distances between the radiated elements. To add filtering capability to the UWB antenna array and eliminate interference from the out-of-band frequencies, a multimode resonator (MMR) bandpass filter (BPF) is incorporated in the feedline while maintaining a compact size. The measurement results showed a close agreement with simulated results. The proposed UWB filtering antenna array design achieved a wide fractional bandwidth of more than 109.87%, a high realized gain of more than 7.4 dBi, and a compact size of 1.08 λ0 × 1.08 λ0 × 0.035 λ0 at 6.5 GHz center frequency. These advantages make the proposed antenna suitable for UWB applications such as indoor tracking, radar systems and positioning applications.

Highlights

  • Introduction nal affiliationsThe ultrawideband technology, since it was introduced by the Federal CommunicationCommission (FCC) [1], has been applied for many wireless applications such as UnmannedAerial Vehicle (UAV) systems [2], sensing and medical applications [3], weather radar application [4], indoor localization systems [5], wireless body area networks (WBANs) [6]and the Internet of Things (IoT) [7]

  • A referencefilter antenna array is designed.UWB. This is followed by a small-sized single-wing being embedded infirst the modified antenna array filter being embedded in the modified UWB antenna array tosmall-sized arrive at theUWB

  • The final modified UWB antenna array consists of a two-element radiating patches with an inter-element spacing of d2 connected by an equal power divider

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Summary

A UWB Antenna Array Integrated with Multimode Resonator

Sharif Ahmed 1, * , Tan Kim Geok 1, *, Mohamad Yusoff Alias 1 , Ferdous Hossain 1 , Hussein Alsariera 2 , Azlan Abdaziz 1 and Ping Jack Soh 3.

UWB Antenna Design
Single Patch UWB Antenna
Modified
Modified UWB Antenna Array
Design parameters of modified
Multimode Resonator-Based UWB Bandpass Filter
Prototype thesingle-wing
Integration of Modified UWB Antenna Array and BPF Filter
11. Simulated
16. Radiationand andgain gainmeasurement measurementsetup setupofofUWB
Design
Design Configuration
Findings
Conclusions
Full Text
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