A compact slot antenna configuration for ultrawideband (UWB) terminals and mobile phones

Abstract

A novel technique to design a mobile phone antenna by using an ultrawideband (UWB) antenna configuration is proposed. The technique is validated with a novel printed slot antenna configuration. The slot is composed of a circle connected to a trapezoid and fed by means of a 50 Ω microstrip line connected to a patch with similar shape to the slot. An UWB antenna with size of 19 mm × 24 mm and measured −10 dB bandwidth of 2.97‐11.32 GHz is developed based on the configuration. When the configuration is applied in a system circuit board of 60 mm × 115 mm to design a mobile phone antenna, the simulated −6 dB bandwidths are 1.0‐1.2 GHz and 2.25‐15 GHz. To enhance antenna bandwidth, another slot with rectangular shape is etched in the ground plane, and the microstrip line is moved to the center of the circuit board and folded to distribute along the rectangular slot. The measured −6 dB bandwidths of the mobile phone antenna are 0.69‐1.09, 1.68‐2.75, 3.45‐3.52, and 3.62‐15 GHz.

An Investigation of Stepped Open Slot Antenna With Circular Tuning Stub

“…√ ε r (16) where P 4 is the path length, and the calculated value of P 4 is 40.675 mm. The calculated value of f 3 is 3.52 GHz.…”

“…Loading of the slot on the ground plane and patch provides new edges for fringing and also produces new resonating frequencies [13]. The impedance bandwidth of the open slot antenna can be modified by the following methods 1) By introducing notches on the circumference of the open slot which changes the resonant path length [7], 2) By cutting the steps on the open slot [14] which changes the mutual coupling between ground plane and radiating element, 3) By tapering the slot [15,16]. The rotation of the radiating patch produces a large number of resonating modes, and by choosing the proper angle, these modes can be overlapped [17].…”

Design of Novel Ultrabroadband Printed Antenna and Its Efficient Optimization Using Self-Adaptive Hybrid Differential Evolution Algorithm

“…[6] covers the frequency range of 2.85-11.85 GHz in a size of 20 × 28 mm 2 . Besides, other methods have been implemented to enhance the impedance bandwidth [5,[14][15][16]. In Ref.…”

“…In Ref. [14], a rectangular strip is connected to the circular patch to modify its shape, and a gap similar to the patch is slotted into the ground below the patch, making the antenna cover the frequency range of 2.97-11.32 GHz in a size of 19 × 24 mm 2 . A fork-shaped patch, which is used in the antenna exhibited in Ref.…”

Compact wideband MIMO mobile‐antenna system design using mode‐based decoupling techniques

“…The normally used techniques for creating wideband antennas fall into three classes: antenna‐geometry optimization, parasitic‐element employment, and feeding‐technique adoption . However, all these conventional methods occupy large volumes, which cannot support the continuous miniaturization.…”