Directional antenna isolation structure
First Claim
1. A Radio Frequency (RF) structure comprising:
- a Power Amplifier (PA) having a PA input and a PA output;
a PA ground switch coupled between the PA output and ground;
a Low Noise Amplifier (LNA) having a LNA input and a LNA output;
a LNA ground switch coupled between the LNA input and ground;
at least two directional antenna structures, each directional antenna structure comprising;
an antenna configured to transmit and receive in a respective direction;
a transmit quarter wavelength circuit coupled between the PA output and the antenna;
a receive quarter wavelength circuit coupled between the antenna and the LNA input; and
an antenna switch coupled between the antenna and ground; and
switch control circuitry configured, when transmitting from a first one of the directional antenna structures, to;
open the PA ground switch;
close the LNA ground switch;
open an antenna switch corresponding to the first one of the directional antenna structures; and
close antenna switches of all other of the directional antenna structures.
7 Assignments
0 Petitions
Accused Products
Abstract
An RF structure includes a PA, a PA ground switch coupled between the PA output and ground, a LNA, and a LNA ground switch coupled between the LNA input and ground. The RF structure includes a plurality of directional antenna structures, each including an antenna, a transmit quarter wavelength circuit coupled between the PA output and the antenna, a receive quarter wavelength circuit coupled between the antenna and the LNA input, and an antenna switch coupled between the antenna and ground. Switch control circuitry controls the PA ground switch, the LNA ground switch, and the plurality of antenna switches during transmit and receive operations to control the flow of RF receive signals from the antennas to the LNA and the flow of RF transmit signals from the PA to the antennas. The transmit and receive quarter wavelength circuits may be traces or be constructed of lumped circuit elements.
12 Citations
20 Claims
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1. A Radio Frequency (RF) structure comprising:
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a Power Amplifier (PA) having a PA input and a PA output; a PA ground switch coupled between the PA output and ground; a Low Noise Amplifier (LNA) having a LNA input and a LNA output; a LNA ground switch coupled between the LNA input and ground; at least two directional antenna structures, each directional antenna structure comprising; an antenna configured to transmit and receive in a respective direction; a transmit quarter wavelength circuit coupled between the PA output and the antenna; a receive quarter wavelength circuit coupled between the antenna and the LNA input; and an antenna switch coupled between the antenna and ground; and switch control circuitry configured, when transmitting from a first one of the directional antenna structures, to; open the PA ground switch; close the LNA ground switch; open an antenna switch corresponding to the first one of the directional antenna structures; and close antenna switches of all other of the directional antenna structures. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A Radio Frequency (RF) structure formed on a substrate comprising:
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a Power Amplifier (PA) ground switch coupled between a PA output and ground; a Low Noise Amplifier (LNA) ground switch coupled between an LNA input and ground; at least two directional antenna structures, each directional antenna structure comprising; an antenna configured to transmit and receive in a respective direction; a transmit quarter wavelength circuit coupled between the PA output and the antenna; a receive quarter wavelength circuit coupled between the antenna and the LNA input; and an antenna switch coupled between the antenna and ground; and switch control circuitry configured, when transmitting from a first one of the directional antenna structures, to; open the PA ground switch; close the LNA ground switch; open an antenna switch corresponding to the first one of the directional antenna structures; and close antenna switches of all other of the directional antenna structures. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A method for operating a communication device having a Radio Frequency (RF) structure that includes at least two directional antenna structures, the method comprising:
during transmit operations for a first directional antenna structure of the at least two directional antenna structures; amplifying a RF transmit signal by a Power Amplifier (PA) having a PA input and a PA output; opening a PA ground switch that couples between the PA output and ground; closing a Low Noise Amplifier (LNA) ground switch that couples between an LNA input and ground; opening a first antenna switch corresponding to the first directional antenna structure, the first antenna switch coupled between a first antenna and ground, coupled to an antenna side of a first transmit quarter wavelength circuit that couples between the PA output and the first antenna, and coupled to an antenna side of a first receive quarter wavelength circuit that couples between the first antenna and the LNA input; closing antenna switches corresponding to all other of the at least two directional antenna structures; and transmitting a first RF transmit signal via the first antenna. - View Dependent Claims (16, 17, 18, 19, 20)
Specification