A UWB Antenna Array Integrated with Multimode Resonator Bandpass Filter

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.

A High-Performance, Low-Cost, and Integrated Hairpin Topology RF Switched Filter Bank for Radar Applications

“…In radar systems, employing multiple filters for various frequencies incurs space, time, and financial expenses. A preferred solution to address this drawback is the use of a switchable filter bank [ 15 , 16 , 17 ]. This configuration involves placing two or more filters in close proximity, ensuring high isolation and improved performance.…”

A Compact Planar Ultra-Wideband Array Antenna

“…Series feed structures [9], parallel feed structures [10][11][12][13][14][15][16][17][18][19], fractional and Fibonacci arrays [20,21], and MIMO arrays [22][23][24] are the most common array architectures used in the current research for planar UWB arrays. Te series feed itself possesses limited bandwidth characteristics.…”

Design and analysis of clover leaf‐shaped fractal antenna integrated with stepped impedance resonator for wireless applications

“…From the development of the global system of mobile communication to the fourth‐generation (4G) wireless communication system and from WiMAX to WLAN network standards, it is important to have antennas that are both small and multiband. The fractal concept is a new technique for the designing patch antenna similar to the use of self‐similar possessions of the fractal geometry for realizing the multiband characteristics by the use of space‐filling assets so as to decrease the antenna dimensions 1 . The radiating characteristics of the microstrip patch antenna are altered on a regular basis by employing self‐similar shapes, space‐filling performance, and increasing the utilization rate of space.…”

“…The fractal concept is a new technique for the designing patch antenna similar to the use of selfsimilar possessions of the fractal geometry for realizing the multiband characteristics by the use of space-filling assets so as to decrease the antenna dimensions. 1 The radiating characteristics of the microstrip patch antenna are altered on a regular basis by employing self-similar shapes, space-filling performance, and increasing the utilization rate of space. As a result, the antenna's effective electrical geometrical dimensions is increased, the antenna's surface current path is maximized, and bandwidth gets increased.…”