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
Summary
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.
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