Miniaturized Size Branch Line Coupler Using Open Stubs With High-Low Impedances

Abstract-In this paper, a novel miniaturized branch-line coupler (BLC) operating at 1.675 GHz is proposed. Partially meandered lines and dual transmission lines equivalent technology are used as the coupler's shunt arms, producing significant reduction by more than 68% compared with the conventional coupler. Moreover, the coupler can equally divide the input signal with 90 • phase of difference while maintaining the initial power from the source with a simple structure. The simulated and measured results are in good agreement, thereby verifying the design concept.

Section: Results and Analysismentioning

confidence: 99%

“…On the other hand, disadvantage of the proposed BLC is that the percentage bandwidth shrinks evidently. [6].…”

Section: Results and Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A Novel Miniaturized Branch-Line Coupler With Equivalent Transmission Lines

Sun¹,

Yin²,

Xu³

et al. 2013

“…In addition, various methods have been proposed to effectively reduce the size of the branch line hybrid couplers [10][11][12][13][14][15][16][17]. The size-reduction methods are T-mode approach using open stub with highlow impedance [10], artificial transmission lines [11], printed distributed capacitor [12], high-impedance transmission lines and interdigitated shunt capacitor [13], and coupled-line section [14], etc.…”

Section: Introductionmentioning

confidence: 99%

Compact Multilayer Hybrid Coupler Based on Size Reduction Methods

Kim¹,

Yoon²

2015

Abstract-This paper presents a compact multilayer hybrid coupler based on a microstrip viatransition and short transmission line with a capacitor on each side to reduce circuit size. The microstrip via-transition is connected to two microstrip lines in different layers to configure a sandwich structure. To reduce the passive component circuit size, the design method uses a microstrip via-transition and a short transmission line with capacitors on each side. To validate the microstrip via-transition and short transmission line with capacitor, a multilayer hybrid coupler is implemented at a center frequency of 2 GHz. The measured characteristics agreed well with the simulation results, and above 90% circuit-size reduction compared with conventional couplers was realized.

“…Coupler is an important and fundamental component in microwave circuits and antenna systems [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15]. Recently, there has been a growing demand for investigating crossover (the special case of coupler) for circuit layout and routing [16][17][18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Closed-Form Design Formulations of Arbitrary Phase Delay Crossover Based on Admittance Matrix

Gao¹,

Yang²,

Wu³

2013

Abstract-A design method for four-port crossover with arbitrary phase delay is proposed in this paper. This method is based on admittance matrix. Closed-form design formulations are deduced by making the structure admittance matrix equal to theoretical one. A crossover with 45 • phase delay is designed and fabricated for theory verification. In the Butler beam forming network, this crossover has two functions for making the elimination of the 45 • phase shifter possible and being used for circuit layout. Thus compact structure and good performance of Butler network can be realized.