W-band CMOS Phased-Array Receiver with Antenna in eWLB Package

This paper presents a W-band CMOS 4-element phased-array receiver integrated with antenna in embedded wafer level ball (eWLB) package. The proposed receiver exhibits the characteristics of 5-bit gain and 7-bit phase resolution with RMS gain of
$< 0.2\text{dB}$
and phase of
$< 1^{\circ}$
, respectively. Then the effects of the balun's tap on its balance and matching are investigated. To improve good balance of balun, the parasitic resistors and inductors of the input balun should be as small as possible. Meanwhile, short-circuited stub is also added onto the output balun to realize good output impedance matching. Finally,
$1\times4$
array in
$\text{eWLB}$
package with wide beam steering of
$\pm 40^{\circ}$
is realized in this work.