Abstract
A novel compact tapered-slot-fed antenna (TSA) with anti-spiral shape and lumped resistors is presented for ultra-wideband (UWB) applications. Unique coplanar waveguide (CPW) to coplanar strip (CPS) feeding structure and exponential slot are designed to ensure the continuous current propagation and good impedance matching. With a pair of anti-spiral-shaped structure loadings at the end of the antenna, the radiation performance in lower operating band can be enhanced obviously. The typical resistor loading technique is applied to improve the time domain characteristics and expand the bandwidth. The fabricated prototype of this proposed antenna with a size of 53 × 63.5 mm2 was measured to confirm simulated results. The proposed antenna has S11 less than −10 dB in the range of 1.2–9.8 GHz, and the group delay result is only 0.4 ns. These findings indicate the proposed antenna can be taken as a promising candidate in UWB communication field.
Highlights
Ultra-wideband (UWB) technology can be taken as a powerful complement to narrowband technology due to its special characteristics, such as wide bandwidth, low profile, simple manufacturing, moderate gain in compact size, and endfire radiation pattern [1].It is utilized in wireless communication, radar imaging and sounding, and for human care monitoring and astronomy [2,3,4,5]
Exponential or elliptical tapered slot were analyzed for better continuity and appropriate aperture, and the coplanar waveguide (CPW) to slot transitions were applied for better natural transformation [22,23]
We propose a modified coplanar tapered slot antenna (TSA), which is terminated with two novel anti-spiral shape to enlarge the electrical aperture and reduce the reflection power
Summary
Ultra-wideband (UWB) technology can be taken as a powerful complement to narrowband technology due to its special characteristics, such as wide bandwidth, low profile, simple manufacturing, moderate gain in compact size, and endfire radiation pattern [1]. Exponential or elliptical tapered slot were analyzed for better continuity and appropriate aperture, and the coplanar waveguide (CPW) to slot transitions were applied for better natural transformation [22,23]. Among these proposed UWB TSAs, the optimal antenna design should be one tradeoff choice according to the required small structure, easy manufacturing and convenient to be integrated with miniature RF front ends. One antenna prototype is fabricated and measured fully, and some analyses are implemented for better understanding the proposed antenna
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