Pair Of Spurlines Research Articles

Compact Wideband Meandered Slotted Multi Frequency Microstrip Antenna

A compact wideband multi frequency microstrip antenna for wireless communication is proposed in this paper. The antenna is designed by introducing meandered slot on the patch and a pair of spur lines along the triangular notch on the finite ground plane. The overall size of the fabricated antenna is very small and low profile as the total dimension is 20 × 16 mm2. The proposed antenna operates at 3.7 GHz, 4.27 GHz and 5.1 GHz which may be suitable for WiMAX and WLAN applications. In addition with multi frequency operation a wide bandwidth (VSWR ≤ 2) has been achieved from 6 to 13.7 GHz i.e. 78.2% bandwidth of center frequency, which is suitable for X-band communication and ITU band applications. The meandered slot on the patch causes multi frequency operation of the antenna with 60% compactness and the spur line along with triangular notch on finite ground plane cause bandwidth enhancement.

Dual-Band Filtering Power Divider Using Dual-Resonance Resonators With Ultrawide Stopband and Good Isolation

In this letter, a novel compact dual-band filtering power divider (DB-FPD) is proposed. It consists of a U-shaped Wilkinson power divider, two pairs of dual-resonance resonators (DRRs), and a pair of spur lines. With the simultaneous use and appropriate design of the coupled feedlines, mixed electric and magnetic couplings between the DRRs and spur-lines with different lengths, multiple transmission zeros are produced which result in two passbands with desired power division, high-frequency selectivity, good isolation, and an ultrawide stopband. A prototype DB-FPD operating at 2.3 and 3.5 GHz with 3-dB fractional bandwidths of 8% and 6% is designed, fabricated, and measured. The measured responses agree well with the design simulations, exhibiting a stopband up to 13.8 GHz ( $6f_{0}$ ) with 20-dB rejection level.

Balanced Band-Notched UWB Filtering Circular Patch Antenna with Common-Mode Suppression

This letter presents a balanced band-notched ultra-wideband (UWB) filtering circular patch antenna fed by a microstrip line. The proposed circuit is composed of a λ/4 slotline-resonator-based balanced band-notched UWB bandpass filter (BPF) and a stub-loaded circular radiating patch. The compact balanced BPF is new in that the slotline resonator is fed judiciously at its open end so that differential-mode fields can be effectively excited in the slotline resonator. Moreover, it can achieve an all-stop-like common-mode rejection because the slotline resonator is incomplete in structure when in common-mode operation. The way the BPF is coupled to the circular radiating patch is novel in that a good impedance match can be easily obtained with the aid of two tuning open stubs. A pair of spur-lines was implemented in the microstrip feedline near the plane of symmetry to produce a notch band around 5.5 GHz. Measurement shows that the differential-mode operating band with return loss greater than 10 dB covers 2.95-10.75 GHz except for the notch band of 5.01-6.19 GHz. Very good common-mode suppression is observed with the measured common-mode reflection coefficient greater than -1.78 dB in 1-12 GHz.

UMTS diplexer design using the antiparallel‐coupled lines loaded with a stepped impedance resonator

AbstractWe present a novel UMTS diplexer design using the filters of antiparallel‐coupled lines structure loaded with a stepped impedance microstrip resonator. The diplexer is composed of two filters. And a microstrip line of quarter‐wavelength is used to links each filter to the common port. The composing filters exhibit two tunable transmission zeros which are used to implement the mid‐passband zero implantation for improving the isolation between the transmitting (Tx) and the receiving (Rx) ports. A pair of spurlines is used in the coupled lines of the Tx‐filter to further increase the isolation. An experiment is conducted to assure the diplexer's performance and to verify the circuit design. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:2988–2990, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26421

The use of a pair of spur lines for broadband circular microstrip antenna with embedded reactive loading

This communication demonstrates the use of a pair of spur lines for a broadband circular microstrip antenna with an embedded reactive loading. With the use of the spur lines, the impedance bandwidth of the proposed design can be enhanced. The obtained bandwidth can reach up to 112.5 MHz, which is about 1.32 times that (86 MHz) of the original broadband antenna without spur lines. The variations in antenna gain within the impedance bandwidth are also less than 2 dBi. Details of the proposed design are described, and experimental results of the antenna performance are presented and discussed.

Dual-frequency rectangular microstrip antenna with embedded spur lines and integrated reactive loading

Single-feed dual-frequency operation of a rectangular microstrip antenna with a pair of spur lines at the nonradiating edges and an integrated reactive loading at one of the radiating edges is proposed and experimentally studied. The two operating frequencies have the same polarization planes, and various frequency ratios of the two frequencies within a range of about 1.1–1.6 can be achieved. Details of the design considerations for the proposed antenna are described, and experimental results of the obtained dual-frequency performance are presented and discussed. ©1999 John Wiley & Sons, Inc. Microwave Opt Technol Lett 21: 272–275, 1999.

Single-feed dual-frequency equilateral-triangular microstrip antenna with pair of spur lines

Novel dual-frequency operation of a single-feed equilateral-triangular microstrip antenna with a pair of spur lines is demonstrated. The two operating frequencies are of the same polarisation planes and, by varying the spur-line length, the frequency ratio of the two operating frequencies is tunable in the range of ~ 1.2 - 2.1. Details of the antenna design are described, and experimental results are presented and discussed.