Circuit board having a pereipheral antenna apparatus with selectable antenna elements and selectable phase shifting
First Claim
1. A system for selective phase shifting, comprising:
- an input port;
a straight-through path coupled to the input port and including a first RF switch;
a long path of predetermined length coupled to the input port and including a second RF switch coupled to a ground; and
an output port coupled to the straight-through path and the long path.
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Accused Products
Abstract
A circuit board for wireless communications includes communication circuitry for modulating and/or demodulating a radio frequency (RF) signal and an antenna apparatus for transmitting and receiving the RF signal, the antenna apparatus having selectable antenna elements located near one or more peripheries of the circuit board and selectable phase shifting. A switching network couples one or more of the selectable elements to the communication circuitry and provides impedance matching regardless of which or how many of the antenna elements are selected, and includes a selectable phase shifter to allow the phase of the antenna elements to be shifted by 180 degrees. The phase shifter includes a first RF switch and two ¼-wavelength delay lines of PCB traces or delay elements and a second RF switch. The phase shifter selectively provides a straight-through path, a 180 degree phase shift, a high impedance state, or a notch filter.
156 Citations
28 Claims
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1. A system for selective phase shifting, comprising:
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an input port;
a straight-through path coupled to the input port and including a first RF switch;
a long path of predetermined length coupled to the input port and including a second RF switch coupled to a ground; and
an output port coupled to the straight-through path and the long path. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method for phase shifting an RF signal, comprising:
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receiving an RF signal at an input port;
disabling a straight-through path coupled to the input port by applying a zero or reverse bias to a first RF switch included in the straight-through path;
phase shifting the RF signal by enabling a long path of a predetermined length coupled to the input port by applying a zero or reverse bias to a second RF switch included in the long path, the second RF switch coupled to a ground; and
transmitting the phase shifted RF signal to an output port coupled to the straight-through path and the long path. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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21. An apparatus, comprising:
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an input port configured to receive an RF signal;
means for selectively transmitting the RF signal from the input port to an output port, the means for selectively transmitting comprising one first RF switch; and
means for selectively transmitting and 180 degree phase shifting the RF signal from the input port to the output port, the means for selectively transmitting and 180 degree phase shifting comprising one second RF switch. - View Dependent Claims (22, 23)
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24. An antenna apparatus having selectable antenna elements and selectable phase shifting, comprising:
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communication circuitry located in a first area of a circuit board, the communication circuitry configured to generate an RF signal into an antenna feed port of the circuit board;
a first antenna element located near a first periphery of the circuit board, the first antenna element configured to produce a first directional radiation pattern when coupled to the antenna feed port; and
a phase shifter, the phase shifter including a straight-through path configured to selectively couple the antenna feed port to the first antenna element with a first PIN diode, the phase shifter further including a long path of predetermined length configured to selectively couple the antenna feed port to the first antenna element with a a second PIN diode coupled to a ground. - View Dependent Claims (25, 26, 27, 28)
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Specification