Jun-Bo Jiang

DESIGN OF A NOVEL COMPACT POWER DIVIDER WITH HARMONIC SUPPRESSION

Abstract—This paper presents a novel compact power divider with third harmonic suppression and also can provide a direct current (dc) path which could simplify the other active circuits in the complicated phased array antenna system. The proposed power divider achieves 20% size reduction compared with the conventional Wilkinson power divider. From the measured results, it can be seen that the simulated results can guide the practical circuit very well.

Frequency Notched UWB Slot Antenna with a Fractal-Shaped Slot

A frequency notched ultra-wideband planar slot antenna is presented. By introducing a modified fractal-shaped slot to the patch, a notched band within a wide operation bandwidth is achieved. The designed antenna satisfies the voltage standing wave ratio requirement of less than 2.0 in the frequency band from 3.01 to 13 GHz above while showing the band rejection performance about 500 MHz in the frequency band of 5.59 to 6.09 GHz. Simulation and measurement results are presented for the proposed antenna.

A NOVEL COMPACT UWB NOTCH-FILTER ANTENNA WITH A DUAL-Y-SHAPED SLOT

A novel compact planar antenna with a frequency band- fllter characteristic for UWB applications is proposed and investigated. Having a dual-Y-shaped slot on the patch, a frequency-notched characteristic at 5.2GHz is obtained. The band-notched mechanism of the designed antenna is implemented and experimentally studied. The designed antenna satisfles the voltage standing wave ratio (VSWR) requirement of less than 2.0 in the frequency band between 2.8 and 18.6GHz while showing the band rejection performance in the frequency band from 5.0 to 5.6GHz. This technique is suitable for creating ultra-wideband (UWB) antenna with narrow frequencynotched characteristics.

Small Printed Ultra-Wideband Antenna with an Inverted F-Slotted Ground

A novel printed antenna having a frequency band notched function for UWB application is proposed and studied. With a pair of inverted-F-shaped slots introduced around the microstrip line on the ground and inserting a semicircle-rectangle radiating element, the designed antenna satisfies the VSWR requirement of less than 2.0 in the frequency band between 2.9 GHz–11.15 GHz while showing the band rejection performance in the frequency band from 4.96 GHz to 6.03 GHz. The experiment results and characteristics of the proposed antenna are shown in this paper.

A miniaturized three way power divider

A miniaturized three-way Wilkinson power divider that provides equal power split over a wide bandwidth implemented on a single-layer printed circuit board (PCB) is presented. In this work, the bent microstrip line replaces the straight microstrip line of the conventional power divider, thus, the size of the proposed power divider is 44.75 mm times 70 mm, which is much smaller than the conventional proposed power divider. Good experimental performances of the proposed power divider, including an even power split, low loss, and good isolation between the output ports are obtained. Measured results show that VSWR of the input and three output ports is less than 1.6 across the bandwidth from 0.7 to 1.1 GHz.

Band-Notched UWB Printed Antenna with an Inverted C-Slotted Ground

A novel printed antenna having a frequency band-notched function for UWB applications is proposed and studied. With a pair of inverted C-shaped slots introduced around the microstrip line on the ground, a frequency-notched response at 5.2 GHz is obtained. The designed antenna satisfies the VSWR requirement of less than 2.0 in the frequency band between 2.8 and 10.7 GHz while showing the band rejection performance in the frequency band from 4.8 to 5.7 GHz. Good monopole-like radiation patterns and antenna gains have also been obtained.

Design of Wideband Microstrip-Fed Plannar Monopole Antenna for Multiband Applications

A novel printed wideband monopole antenna for multiband operations is presented. Good impedance matching in a wide dual-band can be achieved by a simple circular monopole and a rectangular conductor-backed plane with a square hole. The measured 10 dB bandwidth for return loss is from 1.78 to 4.19 GHz about 80% and 5.12 to 6.35 GHz about 21.4% which covering all the 2.4/5.2/5.8 GHz WLAN, 2.5/3.5/5.5 GHz WiMAX, DCS (1710–1880 MHz), PCS (1850–1990 MHz), UMT (1920–2170 MHz), and IMT-2000 (1900–2025 MHz) bands applications. Peak antenna gains have been obtained about 3.39 and 3.96 dBi for the lower and upper bands, respectively.

Novel zeroth-order folded-monopole antenna in low profile

A novel low-profile folded-monopole antenna is proposed in this paper, which is composed of two metamaterial unit cells coupled with microstrip gap. It works under the zeroth-order resonance mode, and its vertical radiation vias can be fed in phase without loading any lumped surface mounted elements or inserting any auxiliary phase-shifting lines compared to previously reported designs. An equivalent circuit model for the novel antenna is presented, based on which an even-odd mode analysis is carried out, testifying that the even-mode current is predominant on the radiation vias at the zeroth-order frequency. According to the multiple folded monopole theory, there is a substantial increase in the radiation resistance, enabling the antenna to be well matched without adopting any external matching network. In order to verify the theoretical analyses, a prototype antenna of λ/10 × λ/20 × λ/10, operative at 3.0 GHz, are fabricated and measured, which can achieve radiation efficiency of above 90% and fully omnidirectional monopole-type radiation pattern.

A novel compact UWB notch-fliter antenna with a dual-arrowhead-shaped slot

A novel compact planar antenna with a frequency band-notched characteristic for UWB applications is proposed and investigated. Having a dual-arrowhead-shaped slot on the patch, a frequency-notched response at 5.8 GHz is obtained. The designed antenna satisfies the voltage standing wave ratio (VSWR) requirement of less than 2.0 in the frequency band between 2.8 and 18.6 GHz while showing the band rejection performance in the frequency band from 5.7 to 6.3 GHz. Good monopole-like radiation patterns and antenna gains have also been obtained.

A novel compact power divider with harmonic suppression for phased array antenna application

This paper presents a novel compact power divider with third harmonic suppression and also can provide a direct current (dc) path which could simplify the other active circuits, such as power amplifier, in the complicated phase array antenna feeding network area. The proposed power divider achieves 20% size reduction compared to the conventional Wilkinson power divider and it is beneficial to the miniaturisation of the phased array antenna. From the measured results, it can be seen that the simulated results can instruct the practical circuit very well.