Wilkinson power divider design for dual‐band applications

Abstract

This letter presents the design and measured results of a wideband dual-polarized array antenna for K/Ka-band wireless communication. The proposed antenna is assembled with several single-layer low-permittivity dielectric substrates and two hollow aluminum plates. A rectangular patch, with a parasitic square patch above and a 0.5 mmair-layer in between, is designed as the basic radiating element. Constrained feeding and coupling feeding are both imposed on the rectangular patches with a common ground to separate two feeding networks and optimization of the feeding networks is implemented to solve the coupling problem. As an example, an 8 3 8 array is designed and fabricated. Measured results show that a bandwidth of 21.4% from 25 GHz to 31 GHz has been achieved, with a gain more than 20 dBi and an isolation more than 30 dB for the orthogonal polarizations throughout the whole band. The cross-polarization level is less than 220 dB.ABSTRACT: Chiral sculptured thin films of zinc selenide with different helical periods were deposited on both sides of a glass slide using the serial bideposition technique in order to fabricate a dual-band circularpolarization filter polarizer that exhibits two distinct circular Bragg regimes for a wide range (about 458) of the angle of incidence. This device can be angle tuned within a 68% spectral range.

A New Simplified Approach for Design of Dual-Band Wilkinson Power Divider with Two and Three Transmission Line Sections Using Only Even-Mode Analysis

“…With the advent of multiband transceiver systems, research focus has been shifted towards design of multi-band WPDs, digressing from the well-established design guidelines of conventional single frequency band WPD [1]. For example, for dual-band operations (such as, but not limited to, GSM and PCS for cellular phones), many techniques have been proposed for dual-band WPD design encompassing two Transmission lines (TL) sections equal split [2][3][4][5][6][7], rat-race couplers [8], three TL sections equal-split [9], unequal division [10][11] and meta-material based implementation of WPD [12][13] [14][15]. A two TL sections WPD with length equal to one third of the design wavelength was proposed in [2].…”

“…Clearly for formulation of generic design guidelines over a wide frequency band, LC components response may vary with the change in frequency and may additionally have increasing parasitic effects as the frequency goes higher. One such attempt avoiding the use of LC components was reported in [9] where a three TL sections equal division WPD operating at two arbitrary frequencies was proposed. The design used only a resistor and a third transmission line section to improve upon the return loss and isolation between the output ports as compared to [3] over a wide range of frequency.…”

“…This has an advantage in terms of repeatability and easy fabrication when it comes to the micro-strip implementation. However, the method presented in [9] is mathematically extensive and complex owing to formulation of four unknown parameters of the proposed circuit namely Z 1 , Z 2 , Z 3 and R as shown in Fig. 3(a).…”

“…The idea is then extended to the design of three TL sections WPD as shown in Fig. 3(a) (presented in [9]) with proposed simplifications. With introduction of proposed simplifications in the three TL sections structure of Fig.…”

“…With introduction of proposed simplifications in the three TL sections structure of Fig. 3(a) [9], it is shown that the complexity of the analysis for determination of the unknown parameters of the circuit is II.…”